diff options
Diffstat (limited to 'libgcrypt-1.4.6/cipher/cipher.c')
| -rw-r--r-- | libgcrypt-1.4.6/cipher/cipher.c | 4304 |
1 files changed, 2171 insertions, 2133 deletions
diff --git a/libgcrypt-1.4.6/cipher/cipher.c b/libgcrypt-1.4.6/cipher/cipher.c index 8cfe54f..1948b91 100644 --- a/libgcrypt-1.4.6/cipher/cipher.c +++ b/libgcrypt-1.4.6/cipher/cipher.c @@ -1,2133 +1,2171 @@ -/* cipher.c - cipher dispatcher - * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 - * 2005, 2007, 2008, 2010 Free Software Foundation, Inc. - * - * This file is part of Libgcrypt. - * - * Libgcrypt is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser general Public License as - * published by the Free Software Foundation; either version 2.1 of - * the License, or (at your option) any later version. - * - * Libgcrypt is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this program; if not, see <http://www.gnu.org/licenses/>. - */ - -#include <config.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> - -#include "g10lib.h" -#include "cipher.h" -#include "ath.h" - -#define MAX_BLOCKSIZE 16 -#define TABLE_SIZE 14 -#define CTX_MAGIC_NORMAL 0x24091964 -#define CTX_MAGIC_SECURE 0x46919042 - -#undef NEED_16BYTE_ALIGNED_CONTEXT -#if defined (__i386__) && SIZEOF_UNSIGNED_LONG == 4 && defined (__GNUC__) -#define NEED_16BYTE_ALIGNED_CONTEXT 1 -#endif - -/* A dummy extraspec so that we do not need to tests the extraspec - field from the module specification against NULL and instead - directly test the respective fields of extraspecs. */ -static cipher_extra_spec_t dummy_extra_spec; - -/* This is the list of the default ciphers, which are included in - libgcrypt. */ -static struct cipher_table_entry -{ - gcry_cipher_spec_t *cipher; - cipher_extra_spec_t *extraspec; - unsigned int algorithm; - int fips_allowed; -} cipher_table[] = - { -#if USE_BLOWFISH - { &_gcry_cipher_spec_blowfish, - &dummy_extra_spec, GCRY_CIPHER_BLOWFISH }, -#endif -#if USE_DES - { &_gcry_cipher_spec_des, - &dummy_extra_spec, GCRY_CIPHER_DES }, - { &_gcry_cipher_spec_tripledes, - &_gcry_cipher_extraspec_tripledes, GCRY_CIPHER_3DES, 1 }, -#endif -#if USE_ARCFOUR - { &_gcry_cipher_spec_arcfour, - &dummy_extra_spec, GCRY_CIPHER_ARCFOUR }, -#endif -#if USE_CAST5 - { &_gcry_cipher_spec_cast5, - &dummy_extra_spec, GCRY_CIPHER_CAST5 }, -#endif -#if USE_AES - { &_gcry_cipher_spec_aes, - &_gcry_cipher_extraspec_aes, GCRY_CIPHER_AES, 1 }, - { &_gcry_cipher_spec_aes192, - &_gcry_cipher_extraspec_aes192, GCRY_CIPHER_AES192, 1 }, - { &_gcry_cipher_spec_aes256, - &_gcry_cipher_extraspec_aes256, GCRY_CIPHER_AES256, 1 }, -#endif -#if USE_TWOFISH - { &_gcry_cipher_spec_twofish, - &dummy_extra_spec, GCRY_CIPHER_TWOFISH }, - { &_gcry_cipher_spec_twofish128, - &dummy_extra_spec, GCRY_CIPHER_TWOFISH128 }, -#endif -#if USE_SERPENT - { &_gcry_cipher_spec_serpent128, - &dummy_extra_spec, GCRY_CIPHER_SERPENT128 }, - { &_gcry_cipher_spec_serpent192, - &dummy_extra_spec, GCRY_CIPHER_SERPENT192 }, - { &_gcry_cipher_spec_serpent256, - &dummy_extra_spec, GCRY_CIPHER_SERPENT256 }, -#endif -#if USE_RFC2268 - { &_gcry_cipher_spec_rfc2268_40, - &dummy_extra_spec, GCRY_CIPHER_RFC2268_40 }, -#endif -#if USE_SEED - { &_gcry_cipher_spec_seed, - &dummy_extra_spec, GCRY_CIPHER_SEED }, -#endif -#if USE_CAMELLIA - { &_gcry_cipher_spec_camellia128, - &dummy_extra_spec, GCRY_CIPHER_CAMELLIA128 }, - { &_gcry_cipher_spec_camellia192, - &dummy_extra_spec, GCRY_CIPHER_CAMELLIA192 }, - { &_gcry_cipher_spec_camellia256, - &dummy_extra_spec, GCRY_CIPHER_CAMELLIA256 }, -#endif - { NULL } - }; - -/* List of registered ciphers. */ -static gcry_module_t ciphers_registered; - -/* This is the lock protecting CIPHERS_REGISTERED. */ -static ath_mutex_t ciphers_registered_lock = ATH_MUTEX_INITIALIZER; - -/* Flag to check wether the default ciphers have already been - registered. */ -static int default_ciphers_registered; - -/* Convenient macro for registering the default ciphers. */ -#define REGISTER_DEFAULT_CIPHERS \ - do \ - { \ - ath_mutex_lock (&ciphers_registered_lock); \ - if (! default_ciphers_registered) \ - { \ - cipher_register_default (); \ - default_ciphers_registered = 1; \ - } \ - ath_mutex_unlock (&ciphers_registered_lock); \ - } \ - while (0) - - -/* A VIA processor with the Padlock engine requires an alignment of - most data on a 16 byte boundary. Because we trick out the compiler - while allocating the context, the align attribute as used in - rijndael.c does not work on its own. Thus we need to make sure - that the entire context structure is a aligned on that boundary. - We achieve this by defining a new type and use that instead of our - usual alignment type. */ -typedef union -{ - PROPERLY_ALIGNED_TYPE foo; -#ifdef NEED_16BYTE_ALIGNED_CONTEXT - char bar[16] __attribute__ ((aligned (16))); -#endif - char c[1]; -} cipher_context_alignment_t; - - -/* The handle structure. */ -struct gcry_cipher_handle -{ - int magic; - size_t actual_handle_size; /* Allocated size of this handle. */ - size_t handle_offset; /* Offset to the malloced block. */ - gcry_cipher_spec_t *cipher; - cipher_extra_spec_t *extraspec; - gcry_module_t module; - - /* The algorithm id. This is a hack required because the module - interface does not easily allow to retrieve this value. */ - int algo; - - /* A structure with function pointers for bulk operations. Due to - limitations of the module system (we don't want to change the - API) we need to keep these function pointers here. The cipher - open function intializes them and the actual encryption routines - use them if they are not NULL. */ - struct { - void (*cfb_enc)(void *context, unsigned char *iv, - void *outbuf_arg, const void *inbuf_arg, - unsigned int nblocks); - void (*cfb_dec)(void *context, unsigned char *iv, - void *outbuf_arg, const void *inbuf_arg, - unsigned int nblocks); - void (*cbc_enc)(void *context, unsigned char *iv, - void *outbuf_arg, const void *inbuf_arg, - unsigned int nblocks, int cbc_mac); - void (*cbc_dec)(void *context, unsigned char *iv, - void *outbuf_arg, const void *inbuf_arg, - unsigned int nblocks); - } bulk; - - - int mode; - unsigned int flags; - - struct { - unsigned int key:1; /* Set to 1 if a key has been set. */ - unsigned int iv:1; /* Set to 1 if a IV has been set. */ - } marks; - - /* The initialization vector. To help code optimization we make - sure that it is aligned on an unsigned long and u32 boundary. */ - union { - unsigned long dummy_iv; - u32 dummy_u32_iv; - unsigned char iv[MAX_BLOCKSIZE]; - } u_iv; - - unsigned char lastiv[MAX_BLOCKSIZE]; - int unused; /* Number of unused bytes in the IV. */ - - unsigned char ctr[MAX_BLOCKSIZE]; /* For Counter (CTR) mode. */ - - - /* What follows are two contexts of the cipher in use. The first - one needs to be aligned well enough for the cipher operation - whereas the second one is a copy created by cipher_setkey and - used by cipher_reset. That second copy has no need for proper - aligment because it is only accessed by memcpy. */ - cipher_context_alignment_t context; -}; - - - -/* These dummy functions are used in case a cipher implementation - refuses to provide it's own functions. */ - -static gcry_err_code_t -dummy_setkey (void *c, const unsigned char *key, unsigned int keylen) -{ - (void)c; - (void)key; - (void)keylen; - return GPG_ERR_NO_ERROR; -} - -static void -dummy_encrypt_block (void *c, - unsigned char *outbuf, const unsigned char *inbuf) -{ - (void)c; - (void)outbuf; - (void)inbuf; - BUG(); -} - -static void -dummy_decrypt_block (void *c, - unsigned char *outbuf, const unsigned char *inbuf) -{ - (void)c; - (void)outbuf; - (void)inbuf; - BUG(); -} - -static void -dummy_encrypt_stream (void *c, - unsigned char *outbuf, const unsigned char *inbuf, - unsigned int n) -{ - (void)c; - (void)outbuf; - (void)inbuf; - (void)n; - BUG(); -} - -static void -dummy_decrypt_stream (void *c, - unsigned char *outbuf, const unsigned char *inbuf, - unsigned int n) -{ - (void)c; - (void)outbuf; - (void)inbuf; - (void)n; - BUG(); -} - - -/* Internal function. Register all the ciphers included in - CIPHER_TABLE. Note, that this function gets only used by the macro - REGISTER_DEFAULT_CIPHERS which protects it using a mutex. */ -static void -cipher_register_default (void) -{ - gcry_err_code_t err = GPG_ERR_NO_ERROR; - int i; - - for (i = 0; !err && cipher_table[i].cipher; i++) - { - if (! cipher_table[i].cipher->setkey) - cipher_table[i].cipher->setkey = dummy_setkey; - if (! cipher_table[i].cipher->encrypt) - cipher_table[i].cipher->encrypt = dummy_encrypt_block; - if (! cipher_table[i].cipher->decrypt) - cipher_table[i].cipher->decrypt = dummy_decrypt_block; - if (! cipher_table[i].cipher->stencrypt) - cipher_table[i].cipher->stencrypt = dummy_encrypt_stream; - if (! cipher_table[i].cipher->stdecrypt) - cipher_table[i].cipher->stdecrypt = dummy_decrypt_stream; - - if ( fips_mode () && !cipher_table[i].fips_allowed ) - continue; - - err = _gcry_module_add (&ciphers_registered, - cipher_table[i].algorithm, - (void *) cipher_table[i].cipher, - (void *) cipher_table[i].extraspec, - NULL); - } - - if (err) - BUG (); -} - -/* Internal callback function. Used via _gcry_module_lookup. */ -static int -gcry_cipher_lookup_func_name (void *spec, void *data) -{ - gcry_cipher_spec_t *cipher = (gcry_cipher_spec_t *) spec; - char *name = (char *) data; - const char **aliases = cipher->aliases; - int i, ret = ! stricmp (name, cipher->name); - - if (aliases) - for (i = 0; aliases[i] && (! ret); i++) - ret = ! stricmp (name, aliases[i]); - - return ret; -} - -/* Internal callback function. Used via _gcry_module_lookup. */ -static int -gcry_cipher_lookup_func_oid (void *spec, void *data) -{ - gcry_cipher_spec_t *cipher = (gcry_cipher_spec_t *) spec; - char *oid = (char *) data; - gcry_cipher_oid_spec_t *oid_specs = cipher->oids; - int ret = 0, i; - - if (oid_specs) - for (i = 0; oid_specs[i].oid && (! ret); i++) - if (! stricmp (oid, oid_specs[i].oid)) - ret = 1; - - return ret; -} - -/* Internal function. Lookup a cipher entry by it's name. */ -static gcry_module_t -gcry_cipher_lookup_name (const char *name) -{ - gcry_module_t cipher; - - cipher = _gcry_module_lookup (ciphers_registered, (void *) name, - gcry_cipher_lookup_func_name); - - return cipher; -} - -/* Internal function. Lookup a cipher entry by it's oid. */ -static gcry_module_t -gcry_cipher_lookup_oid (const char *oid) -{ - gcry_module_t cipher; - - cipher = _gcry_module_lookup (ciphers_registered, (void *) oid, - gcry_cipher_lookup_func_oid); - - return cipher; -} - -/* Register a new cipher module whose specification can be found in - CIPHER. On success, a new algorithm ID is stored in ALGORITHM_ID - and a pointer representhing this module is stored in MODULE. */ -gcry_error_t -_gcry_cipher_register (gcry_cipher_spec_t *cipher, - cipher_extra_spec_t *extraspec, - int *algorithm_id, - gcry_module_t *module) -{ - gcry_err_code_t err = 0; - gcry_module_t mod; - - /* We do not support module loading in fips mode. */ - if (fips_mode ()) - return gpg_error (GPG_ERR_NOT_SUPPORTED); - - ath_mutex_lock (&ciphers_registered_lock); - err = _gcry_module_add (&ciphers_registered, 0, - (void *)cipher, - (void *)(extraspec? extraspec : &dummy_extra_spec), - &mod); - ath_mutex_unlock (&ciphers_registered_lock); - - if (! err) - { - *module = mod; - *algorithm_id = mod->mod_id; - } - - return gcry_error (err); -} - -/* Unregister the cipher identified by MODULE, which must have been - registered with gcry_cipher_register. */ -void -gcry_cipher_unregister (gcry_module_t module) -{ - ath_mutex_lock (&ciphers_registered_lock); - _gcry_module_release (module); - ath_mutex_unlock (&ciphers_registered_lock); -} - -/* Locate the OID in the oid table and return the index or -1 when not - found. An opitonal "oid." or "OID." prefix in OID is ignored, the - OID is expected to be in standard IETF dotted notation. The - internal algorithm number is returned in ALGORITHM unless it - ispassed as NULL. A pointer to the specification of the module - implementing this algorithm is return in OID_SPEC unless passed as - NULL.*/ -static int -search_oid (const char *oid, int *algorithm, gcry_cipher_oid_spec_t *oid_spec) -{ - gcry_module_t module; - int ret = 0; - - if (oid && ((! strncmp (oid, "oid.", 4)) - || (! strncmp (oid, "OID.", 4)))) - oid += 4; - - module = gcry_cipher_lookup_oid (oid); - if (module) - { - gcry_cipher_spec_t *cipher = module->spec; - int i; - - for (i = 0; cipher->oids[i].oid && !ret; i++) - if (! stricmp (oid, cipher->oids[i].oid)) - { - if (algorithm) - *algorithm = module->mod_id; - if (oid_spec) - *oid_spec = cipher->oids[i]; - ret = 1; - } - _gcry_module_release (module); - } - - return ret; -} - -/* Map STRING to the cipher algorithm identifier. Returns the - algorithm ID of the cipher for the given name or 0 if the name is - not known. It is valid to pass NULL for STRING which results in a - return value of 0. */ -int -gcry_cipher_map_name (const char *string) -{ - gcry_module_t cipher; - int ret, algorithm = 0; - - if (! string) - return 0; - - REGISTER_DEFAULT_CIPHERS; - - /* If the string starts with a digit (optionally prefixed with - either "OID." or "oid."), we first look into our table of ASN.1 - object identifiers to figure out the algorithm */ - - ath_mutex_lock (&ciphers_registered_lock); - - ret = search_oid (string, &algorithm, NULL); - if (! ret) - { - cipher = gcry_cipher_lookup_name (string); - if (cipher) - { - algorithm = cipher->mod_id; - _gcry_module_release (cipher); - } - } - - ath_mutex_unlock (&ciphers_registered_lock); - - return algorithm; -} - - -/* Given a STRING with an OID in dotted decimal notation, this - function returns the cipher mode (GCRY_CIPHER_MODE_*) associated - with that OID or 0 if no mode is known. Passing NULL for string - yields a return value of 0. */ -int -gcry_cipher_mode_from_oid (const char *string) -{ - gcry_cipher_oid_spec_t oid_spec; - int ret = 0, mode = 0; - - if (!string) - return 0; - - ath_mutex_lock (&ciphers_registered_lock); - ret = search_oid (string, NULL, &oid_spec); - if (ret) - mode = oid_spec.mode; - ath_mutex_unlock (&ciphers_registered_lock); - - return mode; -} - - -/* Map the cipher algorithm whose ID is contained in ALGORITHM to a - string representation of the algorithm name. For unknown algorithm - IDs this function returns "?". */ -static const char * -cipher_algo_to_string (int algorithm) -{ - gcry_module_t cipher; - const char *name; - - REGISTER_DEFAULT_CIPHERS; - - ath_mutex_lock (&ciphers_registered_lock); - cipher = _gcry_module_lookup_id (ciphers_registered, algorithm); - if (cipher) - { - name = ((gcry_cipher_spec_t *) cipher->spec)->name; - _gcry_module_release (cipher); - } - else - name = "?"; - ath_mutex_unlock (&ciphers_registered_lock); - - return name; -} - -/* Map the cipher algorithm identifier ALGORITHM to a string - representing this algorithm. This string is the default name as - used by Libgcrypt. An pointer to an empty string is returned for - an unknown algorithm. NULL is never returned. */ -const char * -gcry_cipher_algo_name (int algorithm) -{ - return cipher_algo_to_string (algorithm); -} - - -/* Flag the cipher algorithm with the identifier ALGORITHM as - disabled. There is no error return, the function does nothing for - unknown algorithms. Disabled algorithms are vitually not available - in Libgcrypt. */ -static void -disable_cipher_algo (int algorithm) -{ - gcry_module_t cipher; - - REGISTER_DEFAULT_CIPHERS; - - ath_mutex_lock (&ciphers_registered_lock); - cipher = _gcry_module_lookup_id (ciphers_registered, algorithm); - if (cipher) - { - if (! (cipher->flags & FLAG_MODULE_DISABLED)) - cipher->flags |= FLAG_MODULE_DISABLED; - _gcry_module_release (cipher); - } - ath_mutex_unlock (&ciphers_registered_lock); -} - - -/* Return 0 if the cipher algorithm with identifier ALGORITHM is - available. Returns a basic error code value if it is not - available. */ -static gcry_err_code_t -check_cipher_algo (int algorithm) -{ - gcry_err_code_t err = GPG_ERR_NO_ERROR; - gcry_module_t cipher; - - REGISTER_DEFAULT_CIPHERS; - - ath_mutex_lock (&ciphers_registered_lock); - cipher = _gcry_module_lookup_id (ciphers_registered, algorithm); - if (cipher) - { - if (cipher->flags & FLAG_MODULE_DISABLED) - err = GPG_ERR_CIPHER_ALGO; - _gcry_module_release (cipher); - } - else - err = GPG_ERR_CIPHER_ALGO; - ath_mutex_unlock (&ciphers_registered_lock); - - return err; -} - - -/* Return the standard length of the key for the cipher algorithm with - the identifier ALGORITHM. This function expects a valid algorithm - and will abort if the algorithm is not available or the length of - the key is not known. */ -static unsigned int -cipher_get_keylen (int algorithm) -{ - gcry_module_t cipher; - unsigned len = 0; - - REGISTER_DEFAULT_CIPHERS; - - ath_mutex_lock (&ciphers_registered_lock); - cipher = _gcry_module_lookup_id (ciphers_registered, algorithm); - if (cipher) - { - len = ((gcry_cipher_spec_t *) cipher->spec)->keylen; - if (!len) - log_bug ("cipher %d w/o key length\n", algorithm); - _gcry_module_release (cipher); - } - else - log_bug ("cipher %d not found\n", algorithm); - ath_mutex_unlock (&ciphers_registered_lock); - - return len; -} - -/* Return the block length of the cipher algorithm with the identifier - ALGORITHM. This function expects a valid algorithm and will abort - if the algorithm is not available or the length of the key is not - known. */ -static unsigned int -cipher_get_blocksize (int algorithm) -{ - gcry_module_t cipher; - unsigned len = 0; - - REGISTER_DEFAULT_CIPHERS; - - ath_mutex_lock (&ciphers_registered_lock); - cipher = _gcry_module_lookup_id (ciphers_registered, algorithm); - if (cipher) - { - len = ((gcry_cipher_spec_t *) cipher->spec)->blocksize; - if (! len) - log_bug ("cipher %d w/o blocksize\n", algorithm); - _gcry_module_release (cipher); - } - else - log_bug ("cipher %d not found\n", algorithm); - ath_mutex_unlock (&ciphers_registered_lock); - - return len; -} - - -/* - Open a cipher handle for use with cipher algorithm ALGORITHM, using - the cipher mode MODE (one of the GCRY_CIPHER_MODE_*) and return a - handle in HANDLE. Put NULL into HANDLE and return an error code if - something goes wrong. FLAGS may be used to modify the - operation. The defined flags are: - - GCRY_CIPHER_SECURE: allocate all internal buffers in secure memory. - GCRY_CIPHER_ENABLE_SYNC: Enable the sync operation as used in OpenPGP. - GCRY_CIPHER_CBC_CTS: Enable CTS mode. - GCRY_CIPHER_CBC_MAC: Enable MAC mode. - - Values for these flags may be combined using OR. - */ -gcry_error_t -gcry_cipher_open (gcry_cipher_hd_t *handle, - int algo, int mode, unsigned int flags) -{ - int secure = (flags & GCRY_CIPHER_SECURE); - gcry_cipher_spec_t *cipher = NULL; - cipher_extra_spec_t *extraspec = NULL; - gcry_module_t module = NULL; - gcry_cipher_hd_t h = NULL; - gcry_err_code_t err = 0; - - /* If the application missed to call the random poll function, we do - it here to ensure that it is used once in a while. */ - _gcry_fast_random_poll (); - - REGISTER_DEFAULT_CIPHERS; - - /* Fetch the according module and check wether the cipher is marked - available for use. */ - ath_mutex_lock (&ciphers_registered_lock); - module = _gcry_module_lookup_id (ciphers_registered, algo); - if (module) - { - /* Found module. */ - - if (module->flags & FLAG_MODULE_DISABLED) - { - /* Not available for use. */ - err = GPG_ERR_CIPHER_ALGO; - _gcry_module_release (module); - } - else - { - cipher = (gcry_cipher_spec_t *) module->spec; - extraspec = module->extraspec; - } - } - else - err = GPG_ERR_CIPHER_ALGO; - ath_mutex_unlock (&ciphers_registered_lock); - - /* check flags */ - if ((! err) - && ((flags & ~(0 - | GCRY_CIPHER_SECURE - | GCRY_CIPHER_ENABLE_SYNC - | GCRY_CIPHER_CBC_CTS - | GCRY_CIPHER_CBC_MAC)) - || (flags & GCRY_CIPHER_CBC_CTS & GCRY_CIPHER_CBC_MAC))) - err = GPG_ERR_CIPHER_ALGO; - - /* check that a valid mode has been requested */ - if (! err) - switch (mode) - { - case GCRY_CIPHER_MODE_ECB: - case GCRY_CIPHER_MODE_CBC: - case GCRY_CIPHER_MODE_CFB: - case GCRY_CIPHER_MODE_OFB: - case GCRY_CIPHER_MODE_CTR: - case GCRY_CIPHER_MODE_AESWRAP: - if ((cipher->encrypt == dummy_encrypt_block) - || (cipher->decrypt == dummy_decrypt_block)) - err = GPG_ERR_INV_CIPHER_MODE; - break; - - case GCRY_CIPHER_MODE_STREAM: - if ((cipher->stencrypt == dummy_encrypt_stream) - || (cipher->stdecrypt == dummy_decrypt_stream)) - err = GPG_ERR_INV_CIPHER_MODE; - break; - - case GCRY_CIPHER_MODE_NONE: - /* This mode may be used for debugging. It copies the main - text verbatim to the ciphertext. We do not allow this in - fips mode or if no debug flag has been set. */ - if (fips_mode () || !_gcry_get_debug_flag (0)) - err = GPG_ERR_INV_CIPHER_MODE; - break; - - default: - err = GPG_ERR_INV_CIPHER_MODE; - } - - /* Perform selftest here and mark this with a flag in cipher_table? - No, we should not do this as it takes too long. Further it does - not make sense to exclude algorithms with failing selftests at - runtime: If a selftest fails there is something seriously wrong - with the system and thus we better die immediately. */ - - if (! err) - { - size_t size = (sizeof (*h) - + 2 * cipher->contextsize - - sizeof (cipher_context_alignment_t) -#ifdef NEED_16BYTE_ALIGNED_CONTEXT - + 15 /* Space for leading alignment gap. */ -#endif /*NEED_16BYTE_ALIGNED_CONTEXT*/ - ); - - if (secure) - h = gcry_calloc_secure (1, size); - else - h = gcry_calloc (1, size); - - if (! h) - err = gpg_err_code_from_errno (errno); - else - { - size_t off = 0; - -#ifdef NEED_16BYTE_ALIGNED_CONTEXT - if ( ((unsigned long)h & 0x0f) ) - { - /* The malloced block is not aligned on a 16 byte - boundary. Correct for this. */ - off = 16 - ((unsigned long)h & 0x0f); - h = (void*)((char*)h + off); - } -#endif /*NEED_16BYTE_ALIGNED_CONTEXT*/ - - h->magic = secure ? CTX_MAGIC_SECURE : CTX_MAGIC_NORMAL; - h->actual_handle_size = size - off; - h->handle_offset = off; - h->cipher = cipher; - h->extraspec = extraspec; - h->module = module; - h->algo = algo; - h->mode = mode; - h->flags = flags; - - /* Setup bulk encryption routines. */ - switch (algo) - { -#ifdef USE_AES - case GCRY_CIPHER_AES128: - case GCRY_CIPHER_AES192: - case GCRY_CIPHER_AES256: - h->bulk.cfb_enc = _gcry_aes_cfb_enc; - h->bulk.cfb_dec = _gcry_aes_cfb_dec; - h->bulk.cbc_enc = _gcry_aes_cbc_enc; - h->bulk.cbc_dec = _gcry_aes_cbc_dec; - break; -#endif /*USE_AES*/ - - default: - break; - } - } - } - - /* Done. */ - - if (err) - { - if (module) - { - /* Release module. */ - ath_mutex_lock (&ciphers_registered_lock); - _gcry_module_release (module); - ath_mutex_unlock (&ciphers_registered_lock); - } - } - - *handle = err ? NULL : h; - - return gcry_error (err); -} - - -/* Release all resources associated with the cipher handle H. H may be - NULL in which case this is a no-operation. */ -void -gcry_cipher_close (gcry_cipher_hd_t h) -{ - size_t off; - - if (!h) - return; - - if ((h->magic != CTX_MAGIC_SECURE) - && (h->magic != CTX_MAGIC_NORMAL)) - _gcry_fatal_error(GPG_ERR_INTERNAL, - "gcry_cipher_close: already closed/invalid handle"); - else - h->magic = 0; - - /* Release module. */ - ath_mutex_lock (&ciphers_registered_lock); - _gcry_module_release (h->module); - ath_mutex_unlock (&ciphers_registered_lock); - - /* We always want to wipe out the memory even when the context has - been allocated in secure memory. The user might have disabled - secure memory or is using his own implementation which does not - do the wiping. To accomplish this we need to keep track of the - actual size of this structure because we have no way to known - how large the allocated area was when using a standard malloc. */ - off = h->handle_offset; - wipememory (h, h->actual_handle_size); - - gcry_free ((char*)h - off); -} - - -/* Set the key to be used for the encryption context C to KEY with - length KEYLEN. The length should match the required length. */ -static gcry_error_t -cipher_setkey (gcry_cipher_hd_t c, byte *key, unsigned int keylen) -{ - gcry_err_code_t ret; - - ret = (*c->cipher->setkey) (&c->context.c, key, keylen); - if (!ret) - { - /* Duplicate initial context. */ - memcpy ((void *) ((char *) &c->context.c + c->cipher->contextsize), - (void *) &c->context.c, - c->cipher->contextsize); - c->marks.key = 1; - } - else - c->marks.key = 0; - - return gcry_error (ret); -} - - -/* Set the IV to be used for the encryption context C to IV with - length IVLEN. The length should match the required length. */ -static void -cipher_setiv( gcry_cipher_hd_t c, const byte *iv, unsigned ivlen ) -{ - memset (c->u_iv.iv, 0, c->cipher->blocksize); - if (iv) - { - if (ivlen != c->cipher->blocksize) - { - log_info ("WARNING: cipher_setiv: ivlen=%u blklen=%u\n", - ivlen, (unsigned int)c->cipher->blocksize); - fips_signal_error ("IV length does not match blocklength"); - } - if (ivlen > c->cipher->blocksize) - ivlen = c->cipher->blocksize; - memcpy (c->u_iv.iv, iv, ivlen); - c->marks.iv = 1; - } - else - c->marks.iv = 0; - - c->unused = 0; -} - - -/* Reset the cipher context to the initial context. This is basically - the same as an release followed by a new. */ -static void -cipher_reset (gcry_cipher_hd_t c) -{ - memcpy (&c->context.c, - (char *) &c->context.c + c->cipher->contextsize, - c->cipher->contextsize); - memset (&c->marks, 0, sizeof c->marks); - memset (c->u_iv.iv, 0, c->cipher->blocksize); - memset (c->lastiv, 0, c->cipher->blocksize); - memset (c->ctr, 0, c->cipher->blocksize); -} - - -static void -do_ecb_encrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf, - unsigned int nblocks ) -{ - unsigned int n; - - for (n=0; n < nblocks; n++ ) - { - c->cipher->encrypt ( &c->context.c, outbuf, (byte*)/*arggg*/inbuf ); - inbuf += c->cipher->blocksize; - outbuf += c->cipher->blocksize; - } -} - -static void -do_ecb_decrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf, - unsigned int nblocks ) -{ - unsigned int n; - - for (n=0; n < nblocks; n++ ) - { - c->cipher->decrypt ( &c->context.c, outbuf, (byte*)/*arggg*/inbuf ); - inbuf += c->cipher->blocksize; - outbuf += c->cipher->blocksize; - } -} - - -static void -do_cbc_encrypt (gcry_cipher_hd_t c, unsigned char *outbuf, - const unsigned char *inbuf, unsigned int nbytes ) -{ - unsigned int n; - unsigned char *ivp; - int i; - size_t blocksize = c->cipher->blocksize; - unsigned nblocks = nbytes / blocksize; - - if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) - { - if ((nbytes % blocksize) == 0) - nblocks--; - } - - if (c->bulk.cbc_enc) - { - c->bulk.cbc_enc (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks, - (c->flags & GCRY_CIPHER_CBC_MAC)); - inbuf += nblocks * blocksize; - if (!(c->flags & GCRY_CIPHER_CBC_MAC)) - outbuf += nblocks * blocksize; - } - else - { - for (n=0; n < nblocks; n++ ) - { - for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - outbuf[i] = inbuf[i] ^ *ivp++; - c->cipher->encrypt ( &c->context.c, outbuf, outbuf ); - memcpy (c->u_iv.iv, outbuf, blocksize ); - inbuf += blocksize; - if (!(c->flags & GCRY_CIPHER_CBC_MAC)) - outbuf += blocksize; - } - } - - if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) - { - /* We have to be careful here, since outbuf might be equal to - inbuf. */ - int restbytes; - unsigned char b; - - if ((nbytes % blocksize) == 0) - restbytes = blocksize; - else - restbytes = nbytes % blocksize; - - outbuf -= blocksize; - for (ivp = c->u_iv.iv, i = 0; i < restbytes; i++) - { - b = inbuf[i]; - outbuf[blocksize + i] = outbuf[i]; - outbuf[i] = b ^ *ivp++; - } - for (; i < blocksize; i++) - outbuf[i] = 0 ^ *ivp++; - - c->cipher->encrypt (&c->context.c, outbuf, outbuf); - memcpy (c->u_iv.iv, outbuf, blocksize); - } -} - - -static void -do_cbc_decrypt (gcry_cipher_hd_t c, unsigned char *outbuf, - const unsigned char *inbuf, unsigned int nbytes) -{ - unsigned int n; - unsigned char *ivp; - int i; - size_t blocksize = c->cipher->blocksize; - unsigned int nblocks = nbytes / blocksize; - - if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) - { - nblocks--; - if ((nbytes % blocksize) == 0) - nblocks--; - memcpy (c->lastiv, c->u_iv.iv, blocksize); - } - - if (c->bulk.cbc_dec) - { - c->bulk.cbc_dec (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks); - inbuf += nblocks * blocksize; - outbuf += nblocks * blocksize; - } - else - { - for (n=0; n < nblocks; n++ ) - { - /* Because outbuf and inbuf might be the same, we have to - * save the original ciphertext block. We use LASTIV for - * this here because it is not used otherwise. */ - memcpy (c->lastiv, inbuf, blocksize); - c->cipher->decrypt ( &c->context.c, outbuf, inbuf ); - for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - outbuf[i] ^= *ivp++; - memcpy(c->u_iv.iv, c->lastiv, blocksize ); - inbuf += c->cipher->blocksize; - outbuf += c->cipher->blocksize; - } - } - - if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) - { - int restbytes; - - if ((nbytes % blocksize) == 0) - restbytes = blocksize; - else - restbytes = nbytes % blocksize; - - memcpy (c->lastiv, c->u_iv.iv, blocksize ); /* Save Cn-2. */ - memcpy (c->u_iv.iv, inbuf + blocksize, restbytes ); /* Save Cn. */ - - c->cipher->decrypt ( &c->context.c, outbuf, inbuf ); - for (ivp=c->u_iv.iv,i=0; i < restbytes; i++ ) - outbuf[i] ^= *ivp++; - - memcpy(outbuf + blocksize, outbuf, restbytes); - for(i=restbytes; i < blocksize; i++) - c->u_iv.iv[i] = outbuf[i]; - c->cipher->decrypt (&c->context.c, outbuf, c->u_iv.iv); - for(ivp=c->lastiv,i=0; i < blocksize; i++ ) - outbuf[i] ^= *ivp++; - /* c->lastiv is now really lastlastiv, does this matter? */ - } -} - - -static void -do_cfb_encrypt( gcry_cipher_hd_t c, unsigned char *outbuf, - const unsigned char *inbuf, unsigned int nbytes ) -{ - unsigned char *ivp; - size_t blocksize = c->cipher->blocksize; - size_t blocksize_x_2 = blocksize + blocksize; - - if ( nbytes <= c->unused ) - { - /* Short enough to be encoded by the remaining XOR mask. */ - /* XOR the input with the IV and store input into IV. */ - for (ivp=c->u_iv.iv+c->cipher->blocksize - c->unused; - nbytes; - nbytes--, c->unused-- ) - *outbuf++ = (*ivp++ ^= *inbuf++); - return; - } - - if ( c->unused ) - { - /* XOR the input with the IV and store input into IV */ - nbytes -= c->unused; - for(ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- ) - *outbuf++ = (*ivp++ ^= *inbuf++); - } - - /* Now we can process complete blocks. We use a loop as long as we - have at least 2 blocks and use conditions for the rest. This - also allows to use a bulk encryption function if available. */ - if (nbytes >= blocksize_x_2 && c->bulk.cfb_enc) - { - unsigned int nblocks = nbytes / blocksize; - c->bulk.cfb_enc (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks); - outbuf += nblocks * blocksize; - inbuf += nblocks * blocksize; - nbytes -= nblocks * blocksize; - } - else - { - while ( nbytes >= blocksize_x_2 ) - { - int i; - /* Encrypt the IV. */ - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - /* XOR the input with the IV and store input into IV. */ - for(ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - *outbuf++ = (*ivp++ ^= *inbuf++); - nbytes -= blocksize; - } - } - - if ( nbytes >= blocksize ) - { - int i; - /* Save the current IV and then encrypt the IV. */ - memcpy( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - /* XOR the input with the IV and store input into IV */ - for(ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - *outbuf++ = (*ivp++ ^= *inbuf++); - nbytes -= blocksize; - } - if ( nbytes ) - { - /* Save the current IV and then encrypt the IV. */ - memcpy( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - c->unused = blocksize; - /* Apply the XOR. */ - c->unused -= nbytes; - for(ivp=c->u_iv.iv; nbytes; nbytes-- ) - *outbuf++ = (*ivp++ ^= *inbuf++); - } -} - - -static void -do_cfb_decrypt( gcry_cipher_hd_t c, unsigned char *outbuf, - const unsigned char *inbuf, unsigned int nbytes ) -{ - unsigned char *ivp; - unsigned long temp; - int i; - size_t blocksize = c->cipher->blocksize; - size_t blocksize_x_2 = blocksize + blocksize; - - if (nbytes <= c->unused) - { - /* Short enough to be encoded by the remaining XOR mask. */ - /* XOR the input with the IV and store input into IV. */ - for (ivp=c->u_iv.iv+blocksize - c->unused; - nbytes; - nbytes--, c->unused--) - { - temp = *inbuf++; - *outbuf++ = *ivp ^ temp; - *ivp++ = temp; - } - return; - } - - if (c->unused) - { - /* XOR the input with the IV and store input into IV. */ - nbytes -= c->unused; - for (ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- ) - { - temp = *inbuf++; - *outbuf++ = *ivp ^ temp; - *ivp++ = temp; - } - } - - /* Now we can process complete blocks. We use a loop as long as we - have at least 2 blocks and use conditions for the rest. This - also allows to use a bulk encryption function if available. */ - if (nbytes >= blocksize_x_2 && c->bulk.cfb_dec) - { - unsigned int nblocks = nbytes / blocksize; - c->bulk.cfb_dec (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks); - outbuf += nblocks * blocksize; - inbuf += nblocks * blocksize; - nbytes -= nblocks * blocksize; - } - else - { - while (nbytes >= blocksize_x_2 ) - { - /* Encrypt the IV. */ - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - /* XOR the input with the IV and store input into IV. */ - for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - { - temp = *inbuf++; - *outbuf++ = *ivp ^ temp; - *ivp++ = temp; - } - nbytes -= blocksize; - } - } - - if (nbytes >= blocksize ) - { - /* Save the current IV and then encrypt the IV. */ - memcpy ( c->lastiv, c->u_iv.iv, blocksize); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - /* XOR the input with the IV and store input into IV */ - for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - { - temp = *inbuf++; - *outbuf++ = *ivp ^ temp; - *ivp++ = temp; - } - nbytes -= blocksize; - } - - if (nbytes) - { - /* Save the current IV and then encrypt the IV. */ - memcpy ( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - c->unused = blocksize; - /* Apply the XOR. */ - c->unused -= nbytes; - for (ivp=c->u_iv.iv; nbytes; nbytes-- ) - { - temp = *inbuf++; - *outbuf++ = *ivp ^ temp; - *ivp++ = temp; - } - } -} - - -static void -do_ofb_encrypt( gcry_cipher_hd_t c, - byte *outbuf, const byte *inbuf, unsigned nbytes ) -{ - byte *ivp; - size_t blocksize = c->cipher->blocksize; - - if ( nbytes <= c->unused ) - { - /* Short enough to be encoded by the remaining XOR mask. */ - /* XOR the input with the IV */ - for (ivp=c->u_iv.iv+c->cipher->blocksize - c->unused; - nbytes; - nbytes--, c->unused-- ) - *outbuf++ = (*ivp++ ^ *inbuf++); - return; - } - - if( c->unused ) - { - nbytes -= c->unused; - for(ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- ) - *outbuf++ = (*ivp++ ^ *inbuf++); - } - - /* Now we can process complete blocks. */ - while ( nbytes >= blocksize ) - { - int i; - /* Encrypt the IV (and save the current one). */ - memcpy( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - - for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - *outbuf++ = (*ivp++ ^ *inbuf++); - nbytes -= blocksize; - } - if ( nbytes ) - { /* process the remaining bytes */ - memcpy( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - c->unused = blocksize; - c->unused -= nbytes; - for(ivp=c->u_iv.iv; nbytes; nbytes-- ) - *outbuf++ = (*ivp++ ^ *inbuf++); - } -} - -static void -do_ofb_decrypt( gcry_cipher_hd_t c, - byte *outbuf, const byte *inbuf, unsigned int nbytes ) -{ - byte *ivp; - size_t blocksize = c->cipher->blocksize; - - if( nbytes <= c->unused ) - { - /* Short enough to be encoded by the remaining XOR mask. */ - for (ivp=c->u_iv.iv+blocksize - c->unused; nbytes; nbytes--,c->unused--) - *outbuf++ = *ivp++ ^ *inbuf++; - return; - } - - if ( c->unused ) - { - nbytes -= c->unused; - for (ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- ) - *outbuf++ = *ivp++ ^ *inbuf++; - } - - /* Now we can process complete blocks. */ - while ( nbytes >= blocksize ) - { - int i; - /* Encrypt the IV (and save the current one). */ - memcpy( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ ) - *outbuf++ = *ivp++ ^ *inbuf++; - nbytes -= blocksize; - } - if ( nbytes ) - { /* Process the remaining bytes. */ - /* Encrypt the IV (and save the current one). */ - memcpy( c->lastiv, c->u_iv.iv, blocksize ); - c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv ); - c->unused = blocksize; - c->unused -= nbytes; - for (ivp=c->u_iv.iv; nbytes; nbytes-- ) - *outbuf++ = *ivp++ ^ *inbuf++; - } -} - - -static void -do_ctr_encrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf, - unsigned int nbytes ) -{ - unsigned int n; - byte tmp[MAX_BLOCKSIZE]; - int i; - - for(n=0; n < nbytes; n++) - { - if ((n % c->cipher->blocksize) == 0) - { - c->cipher->encrypt (&c->context.c, tmp, c->ctr); - - for (i = c->cipher->blocksize; i > 0; i--) - { - c->ctr[i-1]++; - if (c->ctr[i-1] != 0) - break; - } - } - - /* XOR input with encrypted counter and store in output. */ - outbuf[n] = inbuf[n] ^ tmp[n % c->cipher->blocksize]; - } -} - -static void -do_ctr_decrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf, - unsigned int nbytes ) -{ - do_ctr_encrypt (c, outbuf, inbuf, nbytes); -} - - -/* Perform the AES-Wrap algorithm as specified by RFC3394. We - implement this as a mode usable with any cipher algorithm of - blocksize 128. */ -static gcry_err_code_t -do_aeswrap_encrypt (gcry_cipher_hd_t c, byte *outbuf, unsigned int outbuflen, - const byte *inbuf, unsigned int inbuflen ) -{ - int j, x; - unsigned int n, i; - unsigned char *r, *a, *b; - unsigned char t[8]; - -#if MAX_BLOCKSIZE < 8 -#error Invalid block size -#endif - /* We require a cipher with a 128 bit block length. */ - if (c->cipher->blocksize != 16) - return GPG_ERR_INV_LENGTH; - - /* The output buffer must be able to hold the input data plus one - additional block. */ - if (outbuflen < inbuflen + 8) - return GPG_ERR_BUFFER_TOO_SHORT; - /* Input data must be multiple of 64 bits. */ - if (inbuflen % 8) - return GPG_ERR_INV_ARG; - - n = inbuflen / 8; - - /* We need at least two 64 bit blocks. */ - if (n < 2) - return GPG_ERR_INV_ARG; - - r = outbuf; - a = outbuf; /* We store A directly in OUTBUF. */ - b = c->ctr; /* B is also used to concatenate stuff. */ - - /* If an IV has been set we use that IV as the Alternative Initial - Value; if it has not been set we use the standard value. */ - if (c->marks.iv) - memcpy (a, c->u_iv.iv, 8); - else - memset (a, 0xa6, 8); - - /* Copy the inbuf to the outbuf. */ - memmove (r+8, inbuf, inbuflen); - - memset (t, 0, sizeof t); /* t := 0. */ - - for (j = 0; j <= 5; j++) - { - for (i = 1; i <= n; i++) - { - /* B := AES_k( A | R[i] ) */ - memcpy (b, a, 8); - memcpy (b+8, r+i*8, 8); - c->cipher->encrypt (&c->context.c, b, b); - /* t := t + 1 */ - for (x = 7; x >= 0; x--) - { - t[x]++; - if (t[x]) - break; - } - /* A := MSB_64(B) ^ t */ - for (x=0; x < 8; x++) - a[x] = b[x] ^ t[x]; - /* R[i] := LSB_64(B) */ - memcpy (r+i*8, b+8, 8); - } - } - - return 0; -} - -/* Perform the AES-Unwrap algorithm as specified by RFC3394. We - implement this as a mode usable with any cipher algorithm of - blocksize 128. */ -static gcry_err_code_t -do_aeswrap_decrypt (gcry_cipher_hd_t c, byte *outbuf, unsigned int outbuflen, - const byte *inbuf, unsigned int inbuflen) -{ - int j, x; - unsigned int n, i; - unsigned char *r, *a, *b; - unsigned char t[8]; - -#if MAX_BLOCKSIZE < 8 -#error Invalid block size -#endif - /* We require a cipher with a 128 bit block length. */ - if (c->cipher->blocksize != 16) - return GPG_ERR_INV_LENGTH; - - /* The output buffer must be able to hold the input data minus one - additional block. Fixme: The caller has more restrictive checks - - we may want to fix them for this mode. */ - if (outbuflen + 8 < inbuflen) - return GPG_ERR_BUFFER_TOO_SHORT; - /* Input data must be multiple of 64 bits. */ - if (inbuflen % 8) - return GPG_ERR_INV_ARG; - - n = inbuflen / 8; - - /* We need at least three 64 bit blocks. */ - if (n < 3) - return GPG_ERR_INV_ARG; - - r = outbuf; - a = c->lastiv; /* We use c->LASTIV as buffer for A. */ - b = c->ctr; /* B is also used to concatenate stuff. */ - - /* Copy the inbuf to the outbuf and save A. */ - memcpy (a, inbuf, 8); - memmove (r, inbuf+8, inbuflen-8); - n--; /* Reduce to actual number of data blocks. */ - - /* t := 6 * n */ - i = n * 6; /* The range is valid because: n = inbuflen / 8 - 1. */ - for (x=0; x < 8 && x < sizeof (i); x++) - t[7-x] = i >> (8*x); - for (; x < 8; x++) - t[7-x] = 0; - - for (j = 5; j >= 0; j--) - { - for (i = n; i >= 1; i--) - { - /* B := AES_k^1( (A ^ t)| R[i] ) */ - for (x = 0; x < 8; x++) - b[x] = a[x] ^ t[x]; - memcpy (b+8, r+(i-1)*8, 8); - c->cipher->decrypt (&c->context.c, b, b); - /* t := t - 1 */ - for (x = 7; x >= 0; x--) - { - t[x]--; - if (t[x] != 0xff) - break; - } - /* A := MSB_64(B) */ - memcpy (a, b, 8); - /* R[i] := LSB_64(B) */ - memcpy (r+(i-1)*8, b+8, 8); - } - } - - /* If an IV has been set we compare against this Alternative Initial - Value; if it has not been set we compare against the standard IV. */ - if (c->marks.iv) - j = memcmp (a, c->u_iv.iv, 8); - else - { - for (j=0, x=0; x < 8; x++) - if (a[x] != 0xa6) - { - j=1; - break; - } - } - return j? GPG_ERR_CHECKSUM : 0; -} - - -/**************** - * Encrypt INBUF to OUTBUF with the mode selected at open. - * inbuf and outbuf may overlap or be the same. - * Depending on the mode some contraints apply to NBYTES. - */ -static gcry_err_code_t -cipher_encrypt (gcry_cipher_hd_t c, byte *outbuf, - const byte *inbuf, unsigned int nbytes) -{ - gcry_err_code_t rc = GPG_ERR_NO_ERROR; - - switch( c->mode ) { - case GCRY_CIPHER_MODE_ECB: - if (!(nbytes%c->cipher->blocksize)) - do_ecb_encrypt(c, outbuf, inbuf, nbytes/c->cipher->blocksize ); - else - rc = GPG_ERR_INV_ARG; - break; - case GCRY_CIPHER_MODE_CBC: - if (!(nbytes%c->cipher->blocksize) - || (nbytes > c->cipher->blocksize - && (c->flags & GCRY_CIPHER_CBC_CTS))) - do_cbc_encrypt(c, outbuf, inbuf, nbytes ); - else - rc = GPG_ERR_INV_ARG; - break; - case GCRY_CIPHER_MODE_CFB: - do_cfb_encrypt(c, outbuf, inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_OFB: - do_ofb_encrypt(c, outbuf, inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_CTR: - do_ctr_encrypt(c, outbuf, inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_STREAM: - c->cipher->stencrypt ( &c->context.c, - outbuf, (byte*)/*arggg*/inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_NONE: - if (fips_mode () || !_gcry_get_debug_flag (0)) - { - fips_signal_error ("cipher mode NONE used"); - rc = GPG_ERR_INV_CIPHER_MODE; - } - else - { - if ( inbuf != outbuf ) - memmove (outbuf, inbuf, nbytes); - } - break; - default: - log_fatal("cipher_encrypt: invalid mode %d\n", c->mode ); - rc = GPG_ERR_INV_CIPHER_MODE; - break; - } - return rc; -} - - -/**************** - * Encrypt IN and write it to OUT. If IN is NULL, in-place encryption has - * been requested. - */ -gcry_error_t -gcry_cipher_encrypt (gcry_cipher_hd_t h, void *out, size_t outsize, - const void *in, size_t inlen) -{ - gcry_err_code_t err; - - if (h->mode == GCRY_CIPHER_MODE_AESWRAP) - { - /* Hack to implement AESWRAP without touching the other modes. - The actual function has been taken from the current - development version which does all error checking in each - mode function. */ - if (!in) - err = do_aeswrap_encrypt (h, out, outsize, out, outsize); - else - err = do_aeswrap_encrypt (h, out, outsize, in, inlen); - } - else if (!in) - { - /* Caller requested in-place encryption. */ - /* Actually cipher_encrypt() does not need to know about it, but - * we may change it in the future to get better performance. */ - err = cipher_encrypt (h, out, out, outsize); - } - else if (outsize < ((h->flags & GCRY_CIPHER_CBC_MAC) ? - h->cipher->blocksize : inlen)) - err = GPG_ERR_TOO_SHORT; - else if ((h->mode == GCRY_CIPHER_MODE_ECB - || (h->mode == GCRY_CIPHER_MODE_CBC - && (! ((h->flags & GCRY_CIPHER_CBC_CTS) - && (inlen > h->cipher->blocksize))))) - && (inlen % h->cipher->blocksize)) - err = GPG_ERR_INV_ARG; - else - err = cipher_encrypt (h, out, in, inlen); - - if (err && out) - memset (out, 0x42, outsize); /* Failsafe: Make sure that the - plaintext will never make it into - OUT. */ - - return gcry_error (err); -} - - - -/**************** - * Decrypt INBUF to OUTBUF with the mode selected at open. - * inbuf and outbuf may overlap or be the same. - * Depending on the mode some some contraints apply to NBYTES. - */ -static gcry_err_code_t -cipher_decrypt (gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf, - unsigned int nbytes) -{ - gcry_err_code_t rc = GPG_ERR_NO_ERROR; - - switch( c->mode ) { - case GCRY_CIPHER_MODE_ECB: - if (!(nbytes%c->cipher->blocksize)) - do_ecb_decrypt(c, outbuf, inbuf, nbytes/c->cipher->blocksize ); - else - rc = GPG_ERR_INV_ARG; - break; - case GCRY_CIPHER_MODE_CBC: - if (!(nbytes%c->cipher->blocksize) - || (nbytes > c->cipher->blocksize - && (c->flags & GCRY_CIPHER_CBC_CTS))) - do_cbc_decrypt(c, outbuf, inbuf, nbytes ); - else - rc = GPG_ERR_INV_ARG; - break; - case GCRY_CIPHER_MODE_CFB: - do_cfb_decrypt(c, outbuf, inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_OFB: - do_ofb_decrypt(c, outbuf, inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_CTR: - do_ctr_decrypt(c, outbuf, inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_STREAM: - c->cipher->stdecrypt ( &c->context.c, - outbuf, (byte*)/*arggg*/inbuf, nbytes ); - break; - case GCRY_CIPHER_MODE_NONE: - if (fips_mode () || !_gcry_get_debug_flag (0)) - { - fips_signal_error ("cipher mode NONE used"); - rc = GPG_ERR_INV_CIPHER_MODE; - } - else - { - if (inbuf != outbuf) - memmove (outbuf, inbuf, nbytes); - } - break; - default: - log_fatal ("cipher_decrypt: invalid mode %d\n", c->mode ); - rc = GPG_ERR_INV_CIPHER_MODE; - break; - } - return rc; -} - - -gcry_error_t -gcry_cipher_decrypt (gcry_cipher_hd_t h, void *out, size_t outsize, - const void *in, size_t inlen) -{ - gcry_err_code_t err = 0; - - if (h->mode == GCRY_CIPHER_MODE_AESWRAP) - { - /* Hack to implement AESWRAP without touching the other modes. - The actual function has been taken from the current - development version which does all error checking in each - mode function. */ - if (!in) - err = do_aeswrap_decrypt (h, out, outsize, out, outsize); - else - err = do_aeswrap_decrypt (h, out, outsize, in, inlen); - } - else if (!in) - { - /* Caller requested in-place encryption. */ - /* Actually cipher_encrypt() does not need to know about it, but - * we may change it in the future to get better performance. */ - err = cipher_decrypt (h, out, out, outsize); - } - else if (outsize < inlen) - err = GPG_ERR_TOO_SHORT; - else if (((h->mode == GCRY_CIPHER_MODE_ECB) - || ((h->mode == GCRY_CIPHER_MODE_CBC) - && (! ((h->flags & GCRY_CIPHER_CBC_CTS) - && (inlen > h->cipher->blocksize))))) - && (inlen % h->cipher->blocksize) != 0) - err = GPG_ERR_INV_ARG; - else - err = cipher_decrypt (h, out, in, inlen); - - return gcry_error (err); -} - - - -/**************** - * Used for PGP's somewhat strange CFB mode. Only works if - * the corresponding flag is set. - */ -static void -cipher_sync (gcry_cipher_hd_t c) -{ - if ((c->flags & GCRY_CIPHER_ENABLE_SYNC) && c->unused) - { - memmove (c->u_iv.iv + c->unused, - c->u_iv.iv, c->cipher->blocksize - c->unused); - memcpy (c->u_iv.iv, - c->lastiv + c->cipher->blocksize - c->unused, c->unused); - c->unused = 0; - } -} - - -gcry_error_t -_gcry_cipher_setkey (gcry_cipher_hd_t hd, const void *key, size_t keylen) -{ - return cipher_setkey (hd, (void*)key, keylen); -} - - -gcry_error_t -_gcry_cipher_setiv (gcry_cipher_hd_t hd, const void *iv, size_t ivlen) -{ - cipher_setiv (hd, iv, ivlen); - return 0; -} - -/* Set counter for CTR mode. (CTR,CTRLEN) must denote a buffer of - block size length, or (NULL,0) to set the CTR to the all-zero - block. */ -gpg_error_t -_gcry_cipher_setctr (gcry_cipher_hd_t hd, const void *ctr, size_t ctrlen) -{ - if (ctr && ctrlen == hd->cipher->blocksize) - memcpy (hd->ctr, ctr, hd->cipher->blocksize); - else if (!ctr || !ctrlen) - memset (hd->ctr, 0, hd->cipher->blocksize); - else - return gpg_error (GPG_ERR_INV_ARG); - return 0; -} - - -gcry_error_t -gcry_cipher_ctl( gcry_cipher_hd_t h, int cmd, void *buffer, size_t buflen) -{ - gcry_err_code_t rc = GPG_ERR_NO_ERROR; - - switch (cmd) - { - case GCRYCTL_SET_KEY: /* Deprecated; use gcry_cipher_setkey. */ - rc = cipher_setkey( h, buffer, buflen ); - break; - - case GCRYCTL_SET_IV: /* Deprecated; use gcry_cipher_setiv. */ - cipher_setiv( h, buffer, buflen ); - break; - - case GCRYCTL_RESET: - cipher_reset (h); - break; - - case GCRYCTL_CFB_SYNC: - cipher_sync( h ); - break; - - case GCRYCTL_SET_CBC_CTS: - if (buflen) - if (h->flags & GCRY_CIPHER_CBC_MAC) - rc = GPG_ERR_INV_FLAG; - else - h->flags |= GCRY_CIPHER_CBC_CTS; - else - h->flags &= ~GCRY_CIPHER_CBC_CTS; - break; - - case GCRYCTL_SET_CBC_MAC: - if (buflen) - if (h->flags & GCRY_CIPHER_CBC_CTS) - rc = GPG_ERR_INV_FLAG; - else - h->flags |= GCRY_CIPHER_CBC_MAC; - else - h->flags &= ~GCRY_CIPHER_CBC_MAC; - break; - - case GCRYCTL_DISABLE_ALGO: - /* This command expects NULL for H and BUFFER to point to an - integer with the algo number. */ - if( h || !buffer || buflen != sizeof(int) ) - return gcry_error (GPG_ERR_CIPHER_ALGO); - disable_cipher_algo( *(int*)buffer ); - break; - - case GCRYCTL_SET_CTR: /* Deprecated; use gcry_cipher_setctr. */ - if (buffer && buflen == h->cipher->blocksize) - memcpy (h->ctr, buffer, h->cipher->blocksize); - else if (buffer == NULL || buflen == 0) - memset (h->ctr, 0, h->cipher->blocksize); - else - rc = GPG_ERR_INV_ARG; - break; - - case 61: /* Disable weak key detection (private). */ - if (h->extraspec->set_extra_info) - rc = h->extraspec->set_extra_info - (&h->context.c, CIPHER_INFO_NO_WEAK_KEY, NULL, 0); - else - rc = GPG_ERR_NOT_SUPPORTED; - break; - - case 62: /* Return current input vector (private). */ - /* This is the input block as used in CFB and OFB mode which has - initially been set as IV. The returned format is: - 1 byte Actual length of the block in bytes. - n byte The block. - If the provided buffer is too short, an error is returned. */ - if (buflen < (1 + h->cipher->blocksize)) - rc = GPG_ERR_TOO_SHORT; - else - { - unsigned char *ivp; - unsigned char *dst = buffer; - int n = h->unused; - - if (!n) - n = h->cipher->blocksize; - gcry_assert (n <= h->cipher->blocksize); - *dst++ = n; - ivp = h->u_iv.iv + h->cipher->blocksize - n; - while (n--) - *dst++ = *ivp++; - } - break; - - default: - rc = GPG_ERR_INV_OP; - } - - return gcry_error (rc); -} - - -/* Return information about the cipher handle H. CMD is the kind of - information requested. BUFFER and NBYTES are reserved for now. - - There are no values for CMD yet defined. - - The fucntion always returns GPG_ERR_INV_OP. - - */ -gcry_error_t -gcry_cipher_info (gcry_cipher_hd_t h, int cmd, void *buffer, size_t *nbytes) -{ - gcry_err_code_t err = GPG_ERR_NO_ERROR; - - (void)h; - (void)buffer; - (void)nbytes; - - switch (cmd) - { - default: - err = GPG_ERR_INV_OP; - } - - return gcry_error (err); -} - -/* Return information about the given cipher algorithm ALGO. - - WHAT select the kind of information returned: - - GCRYCTL_GET_KEYLEN: - Return the length of the key. If the algorithm ALGO - supports multiple key lengths, the maximum supported key length - is returned. The key length is returned as number of octets. - BUFFER and NBYTES must be zero. - - GCRYCTL_GET_BLKLEN: - Return the blocklength of the algorithm ALGO counted in octets. - BUFFER and NBYTES must be zero. - - GCRYCTL_TEST_ALGO: - Returns 0 if the specified algorithm ALGO is available for use. - BUFFER and NBYTES must be zero. - - Note: Because this function is in most cases used to return an - integer value, we can make it easier for the caller to just look at - the return value. The caller will in all cases consult the value - and thereby detecting whether a error occured or not (i.e. while - checking the block size) - */ -gcry_error_t -gcry_cipher_algo_info (int algo, int what, void *buffer, size_t *nbytes) -{ - gcry_err_code_t err = GPG_ERR_NO_ERROR; - unsigned int ui; - - switch (what) - { - case GCRYCTL_GET_KEYLEN: - if (buffer || (! nbytes)) - err = GPG_ERR_CIPHER_ALGO; - else - { - ui = cipher_get_keylen (algo); - if ((ui > 0) && (ui <= 512)) - *nbytes = (size_t) ui / 8; - else - /* The only reason is an invalid algo or a strange - blocksize. */ - err = GPG_ERR_CIPHER_ALGO; - } - break; - - case GCRYCTL_GET_BLKLEN: - if (buffer || (! nbytes)) - err = GPG_ERR_CIPHER_ALGO; - else - { - ui = cipher_get_blocksize (algo); - if ((ui > 0) && (ui < 10000)) - *nbytes = ui; - else - /* The only reason is an invalid algo or a strange - blocksize. */ - err = GPG_ERR_CIPHER_ALGO; - } - break; - - case GCRYCTL_TEST_ALGO: - if (buffer || nbytes) - err = GPG_ERR_INV_ARG; - else - err = check_cipher_algo (algo); - break; - - default: - err = GPG_ERR_INV_OP; - } - - return gcry_error (err); -} - - -/* This function returns length of the key for algorithm ALGO. If the - algorithm supports multiple key lengths, the maximum supported key - length is returned. On error 0 is returned. The key length is - returned as number of octets. - - This is a convenience functions which should be preferred over - gcry_cipher_algo_info because it allows for proper type - checking. */ -size_t -gcry_cipher_get_algo_keylen (int algo) -{ - size_t n; - - if (gcry_cipher_algo_info (algo, GCRYCTL_GET_KEYLEN, NULL, &n)) - n = 0; - return n; -} - -/* This functions returns the blocklength of the algorithm ALGO - counted in octets. On error 0 is returned. - - This is a convenience functions which should be preferred over - gcry_cipher_algo_info because it allows for proper type - checking. */ -size_t -gcry_cipher_get_algo_blklen (int algo) -{ - size_t n; - - if (gcry_cipher_algo_info( algo, GCRYCTL_GET_BLKLEN, NULL, &n)) - n = 0; - return n; -} - -/* Explicitly initialize this module. */ -gcry_err_code_t -_gcry_cipher_init (void) -{ - gcry_err_code_t err = GPG_ERR_NO_ERROR; - - REGISTER_DEFAULT_CIPHERS; - - return err; -} - -/* Get a list consisting of the IDs of the loaded cipher modules. If - LIST is zero, write the number of loaded cipher modules to - LIST_LENGTH and return. If LIST is non-zero, the first - *LIST_LENGTH algorithm IDs are stored in LIST, which must be of - according size. In case there are less cipher modules than - *LIST_LENGTH, *LIST_LENGTH is updated to the correct number. */ -gcry_error_t -gcry_cipher_list (int *list, int *list_length) -{ - gcry_err_code_t err = GPG_ERR_NO_ERROR; - - ath_mutex_lock (&ciphers_registered_lock); - err = _gcry_module_list (ciphers_registered, list, list_length); - ath_mutex_unlock (&ciphers_registered_lock); - - return err; -} - - -/* Run the selftests for cipher algorithm ALGO with optional reporting - function REPORT. */ -gpg_error_t -_gcry_cipher_selftest (int algo, int extended, selftest_report_func_t report) -{ - gcry_module_t module = NULL; - cipher_extra_spec_t *extraspec = NULL; - gcry_err_code_t ec = 0; - - REGISTER_DEFAULT_CIPHERS; - - ath_mutex_lock (&ciphers_registered_lock); - module = _gcry_module_lookup_id (ciphers_registered, algo); - if (module && !(module->flags & FLAG_MODULE_DISABLED)) - extraspec = module->extraspec; - ath_mutex_unlock (&ciphers_registered_lock); - if (extraspec && extraspec->selftest) - ec = extraspec->selftest (algo, extended, report); - else - { - ec = GPG_ERR_CIPHER_ALGO; - if (report) - report ("cipher", algo, "module", - module && !(module->flags & FLAG_MODULE_DISABLED)? - "no selftest available" : - module? "algorithm disabled" : "algorithm not found"); - } - - if (module) - { - ath_mutex_lock (&ciphers_registered_lock); - _gcry_module_release (module); - ath_mutex_unlock (&ciphers_registered_lock); - } - return gpg_error (ec); -} +/* cipher.c - cipher dispatcher
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
+ * 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "g10lib.h"
+#include "cipher.h"
+#include "ath.h"
+
+#define MAX_BLOCKSIZE 16
+#define TABLE_SIZE 14
+#define CTX_MAGIC_NORMAL 0x24091964
+#define CTX_MAGIC_SECURE 0x46919042
+
+#undef NEED_16BYTE_ALIGNED_CONTEXT
+#if defined (__i386__) && SIZEOF_UNSIGNED_LONG == 4 && defined (__GNUC__)
+#define NEED_16BYTE_ALIGNED_CONTEXT 1
+#endif
+
+/* A dummy extraspec so that we do not need to tests the extraspec
+ field from the module specification against NULL and instead
+ directly test the respective fields of extraspecs. */
+static cipher_extra_spec_t dummy_extra_spec;
+
+/* This is the list of the default ciphers, which are included in
+ libgcrypt. */
+static struct cipher_table_entry
+{
+ gcry_cipher_spec_t *cipher;
+ cipher_extra_spec_t *extraspec;
+ unsigned int algorithm;
+ int fips_allowed;
+} cipher_table[] =
+ {
+#if USE_BLOWFISH
+ { &_gcry_cipher_spec_blowfish,
+ &dummy_extra_spec, GCRY_CIPHER_BLOWFISH },
+#endif
+#if USE_DES
+ { &_gcry_cipher_spec_des,
+ &dummy_extra_spec, GCRY_CIPHER_DES },
+ { &_gcry_cipher_spec_tripledes,
+ &_gcry_cipher_extraspec_tripledes, GCRY_CIPHER_3DES, 1 },
+#endif
+#if USE_ARCFOUR
+ { &_gcry_cipher_spec_arcfour,
+ &dummy_extra_spec, GCRY_CIPHER_ARCFOUR },
+#endif
+#if USE_CAST5
+ { &_gcry_cipher_spec_cast5,
+ &dummy_extra_spec, GCRY_CIPHER_CAST5 },
+#endif
+#if USE_AES
+ { &_gcry_cipher_spec_aes,
+ &_gcry_cipher_extraspec_aes, GCRY_CIPHER_AES, 1 },
+ { &_gcry_cipher_spec_aes192,
+ &_gcry_cipher_extraspec_aes192, GCRY_CIPHER_AES192, 1 },
+ { &_gcry_cipher_spec_aes256,
+ &_gcry_cipher_extraspec_aes256, GCRY_CIPHER_AES256, 1 },
+#endif
+#if USE_TWOFISH
+ { &_gcry_cipher_spec_twofish,
+ &dummy_extra_spec, GCRY_CIPHER_TWOFISH },
+ { &_gcry_cipher_spec_twofish128,
+ &dummy_extra_spec, GCRY_CIPHER_TWOFISH128 },
+#endif
+#if USE_SERPENT
+ { &_gcry_cipher_spec_serpent128,
+ &dummy_extra_spec, GCRY_CIPHER_SERPENT128 },
+ { &_gcry_cipher_spec_serpent192,
+ &dummy_extra_spec, GCRY_CIPHER_SERPENT192 },
+ { &_gcry_cipher_spec_serpent256,
+ &dummy_extra_spec, GCRY_CIPHER_SERPENT256 },
+#endif
+#if USE_RFC2268
+ { &_gcry_cipher_spec_rfc2268_40,
+ &dummy_extra_spec, GCRY_CIPHER_RFC2268_40 },
+#endif
+#if USE_SEED
+ { &_gcry_cipher_spec_seed,
+ &dummy_extra_spec, GCRY_CIPHER_SEED },
+#endif
+#if USE_CAMELLIA
+ { &_gcry_cipher_spec_camellia128,
+ &dummy_extra_spec, GCRY_CIPHER_CAMELLIA128 },
+ { &_gcry_cipher_spec_camellia192,
+ &dummy_extra_spec, GCRY_CIPHER_CAMELLIA192 },
+ { &_gcry_cipher_spec_camellia256,
+ &dummy_extra_spec, GCRY_CIPHER_CAMELLIA256 },
+#endif
+ { NULL }
+ };
+
+/* List of registered ciphers. */
+static gcry_module_t ciphers_registered;
+
+/* This is the lock protecting CIPHERS_REGISTERED. */
+static ath_mutex_t ciphers_registered_lock = ATH_MUTEX_INITIALIZER;
+
+/* Flag to check whether the default ciphers have already been
+ registered. */
+static int default_ciphers_registered;
+
+/* Convenient macro for registering the default ciphers. */
+#define REGISTER_DEFAULT_CIPHERS \
+ do \
+ { \
+ ath_mutex_lock (&ciphers_registered_lock); \
+ if (! default_ciphers_registered) \
+ { \
+ cipher_register_default (); \
+ default_ciphers_registered = 1; \
+ } \
+ ath_mutex_unlock (&ciphers_registered_lock); \
+ } \
+ while (0)
+
+
+/* A VIA processor with the Padlock engine requires an alignment of
+ most data on a 16 byte boundary. Because we trick out the compiler
+ while allocating the context, the align attribute as used in
+ rijndael.c does not work on its own. Thus we need to make sure
+ that the entire context structure is a aligned on that boundary.
+ We achieve this by defining a new type and use that instead of our
+ usual alignment type. */
+typedef union
+{
+ PROPERLY_ALIGNED_TYPE foo;
+#ifdef NEED_16BYTE_ALIGNED_CONTEXT
+ char bar[16] __attribute__ ((aligned (16)));
+#endif
+ char c[1];
+} cipher_context_alignment_t;
+
+
+/* The handle structure. */
+struct gcry_cipher_handle
+{
+ int magic;
+ size_t actual_handle_size; /* Allocated size of this handle. */
+ size_t handle_offset; /* Offset to the malloced block. */
+ gcry_cipher_spec_t *cipher;
+ cipher_extra_spec_t *extraspec;
+ gcry_module_t module;
+
+ /* The algorithm id. This is a hack required because the module
+ interface does not easily allow to retrieve this value. */
+ int algo;
+
+ /* A structure with function pointers for bulk operations. Due to
+ limitations of the module system (we don't want to change the
+ API) we need to keep these function pointers here. The cipher
+ open function intializes them and the actual encryption routines
+ use them if they are not NULL. */
+ struct {
+ void (*cfb_enc)(void *context, unsigned char *iv,
+ void *outbuf_arg, const void *inbuf_arg,
+ unsigned int nblocks);
+ void (*cfb_dec)(void *context, unsigned char *iv,
+ void *outbuf_arg, const void *inbuf_arg,
+ unsigned int nblocks);
+ void (*cbc_enc)(void *context, unsigned char *iv,
+ void *outbuf_arg, const void *inbuf_arg,
+ unsigned int nblocks, int cbc_mac);
+ void (*cbc_dec)(void *context, unsigned char *iv,
+ void *outbuf_arg, const void *inbuf_arg,
+ unsigned int nblocks);
+ } bulk;
+
+
+ int mode;
+ unsigned int flags;
+
+ struct {
+ unsigned int key:1; /* Set to 1 if a key has been set. */
+ unsigned int iv:1; /* Set to 1 if a IV has been set. */
+ } marks;
+
+ /* The initialization vector. To help code optimization we make
+ sure that it is aligned on an unsigned long and u32 boundary. */
+ union {
+ unsigned long dummy_iv;
+ u32 dummy_u32_iv;
+ unsigned char iv[MAX_BLOCKSIZE];
+ } u_iv;
+
+ unsigned char lastiv[MAX_BLOCKSIZE];
+ int unused; /* Number of unused bytes in the IV. */
+
+ unsigned char ctr[MAX_BLOCKSIZE]; /* For Counter (CTR) mode. */
+
+
+ /* What follows are two contexts of the cipher in use. The first
+ one needs to be aligned well enough for the cipher operation
+ whereas the second one is a copy created by cipher_setkey and
+ used by cipher_reset. That second copy has no need for proper
+ aligment because it is only accessed by memcpy. */
+ cipher_context_alignment_t context;
+};
+
+
+
+/* These dummy functions are used in case a cipher implementation
+ refuses to provide it's own functions. */
+
+static gcry_err_code_t
+dummy_setkey (void *c, const unsigned char *key, unsigned int keylen)
+{
+ (void)c;
+ (void)key;
+ (void)keylen;
+ return GPG_ERR_NO_ERROR;
+}
+
+static void
+dummy_encrypt_block (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf)
+{
+ (void)c;
+ (void)outbuf;
+ (void)inbuf;
+ BUG();
+}
+
+static void
+dummy_decrypt_block (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf)
+{
+ (void)c;
+ (void)outbuf;
+ (void)inbuf;
+ BUG();
+}
+
+static void
+dummy_encrypt_stream (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf,
+ unsigned int n)
+{
+ (void)c;
+ (void)outbuf;
+ (void)inbuf;
+ (void)n;
+ BUG();
+}
+
+static void
+dummy_decrypt_stream (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf,
+ unsigned int n)
+{
+ (void)c;
+ (void)outbuf;
+ (void)inbuf;
+ (void)n;
+ BUG();
+}
+
+
+/* Internal function. Register all the ciphers included in
+ CIPHER_TABLE. Note, that this function gets only used by the macro
+ REGISTER_DEFAULT_CIPHERS which protects it using a mutex. */
+static void
+cipher_register_default (void)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+ int i;
+
+ for (i = 0; !err && cipher_table[i].cipher; i++)
+ {
+ if (! cipher_table[i].cipher->setkey)
+ cipher_table[i].cipher->setkey = dummy_setkey;
+ if (! cipher_table[i].cipher->encrypt)
+ cipher_table[i].cipher->encrypt = dummy_encrypt_block;
+ if (! cipher_table[i].cipher->decrypt)
+ cipher_table[i].cipher->decrypt = dummy_decrypt_block;
+ if (! cipher_table[i].cipher->stencrypt)
+ cipher_table[i].cipher->stencrypt = dummy_encrypt_stream;
+ if (! cipher_table[i].cipher->stdecrypt)
+ cipher_table[i].cipher->stdecrypt = dummy_decrypt_stream;
+
+ if ( fips_mode () && !cipher_table[i].fips_allowed )
+ continue;
+
+ err = _gcry_module_add (&ciphers_registered,
+ cipher_table[i].algorithm,
+ (void *) cipher_table[i].cipher,
+ (void *) cipher_table[i].extraspec,
+ NULL);
+ }
+
+ if (err)
+ BUG ();
+}
+
+/* Internal callback function. Used via _gcry_module_lookup. */
+static int
+gcry_cipher_lookup_func_name (void *spec, void *data)
+{
+ gcry_cipher_spec_t *cipher = (gcry_cipher_spec_t *) spec;
+ char *name = (char *) data;
+ const char **aliases = cipher->aliases;
+ int i, ret = ! stricmp (name, cipher->name);
+
+ if (aliases)
+ for (i = 0; aliases[i] && (! ret); i++)
+ ret = ! stricmp (name, aliases[i]);
+
+ return ret;
+}
+
+/* Internal callback function. Used via _gcry_module_lookup. */
+static int
+gcry_cipher_lookup_func_oid (void *spec, void *data)
+{
+ gcry_cipher_spec_t *cipher = (gcry_cipher_spec_t *) spec;
+ char *oid = (char *) data;
+ gcry_cipher_oid_spec_t *oid_specs = cipher->oids;
+ int ret = 0, i;
+
+ if (oid_specs)
+ for (i = 0; oid_specs[i].oid && (! ret); i++)
+ if (! stricmp (oid, oid_specs[i].oid))
+ ret = 1;
+
+ return ret;
+}
+
+/* Internal function. Lookup a cipher entry by it's name. */
+static gcry_module_t
+gcry_cipher_lookup_name (const char *name)
+{
+ gcry_module_t cipher;
+
+ cipher = _gcry_module_lookup (ciphers_registered, (void *) name,
+ gcry_cipher_lookup_func_name);
+
+ return cipher;
+}
+
+/* Internal function. Lookup a cipher entry by it's oid. */
+static gcry_module_t
+gcry_cipher_lookup_oid (const char *oid)
+{
+ gcry_module_t cipher;
+
+ cipher = _gcry_module_lookup (ciphers_registered, (void *) oid,
+ gcry_cipher_lookup_func_oid);
+
+ return cipher;
+}
+
+/* Register a new cipher module whose specification can be found in
+ CIPHER. On success, a new algorithm ID is stored in ALGORITHM_ID
+ and a pointer representhing this module is stored in MODULE. */
+gcry_error_t
+_gcry_cipher_register (gcry_cipher_spec_t *cipher,
+ cipher_extra_spec_t *extraspec,
+ int *algorithm_id,
+ gcry_module_t *module)
+{
+ gcry_err_code_t err = 0;
+ gcry_module_t mod;
+
+ /* We do not support module loading in fips mode. */
+ if (fips_mode ())
+ return gpg_error (GPG_ERR_NOT_SUPPORTED);
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ err = _gcry_module_add (&ciphers_registered, 0,
+ (void *)cipher,
+ (void *)(extraspec? extraspec : &dummy_extra_spec),
+ &mod);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ if (! err)
+ {
+ *module = mod;
+ *algorithm_id = mod->mod_id;
+ }
+
+ return gcry_error (err);
+}
+
+/* Unregister the cipher identified by MODULE, which must have been
+ registered with gcry_cipher_register. */
+void
+gcry_cipher_unregister (gcry_module_t module)
+{
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+}
+
+/* Locate the OID in the oid table and return the index or -1 when not
+ found. An opitonal "oid." or "OID." prefix in OID is ignored, the
+ OID is expected to be in standard IETF dotted notation. The
+ internal algorithm number is returned in ALGORITHM unless it
+ ispassed as NULL. A pointer to the specification of the module
+ implementing this algorithm is return in OID_SPEC unless passed as
+ NULL.*/
+static int
+search_oid (const char *oid, int *algorithm, gcry_cipher_oid_spec_t *oid_spec)
+{
+ gcry_module_t module;
+ int ret = 0;
+
+ if (oid && ((! strncmp (oid, "oid.", 4))
+ || (! strncmp (oid, "OID.", 4))))
+ oid += 4;
+
+ module = gcry_cipher_lookup_oid (oid);
+ if (module)
+ {
+ gcry_cipher_spec_t *cipher = module->spec;
+ int i;
+
+ for (i = 0; cipher->oids[i].oid && !ret; i++)
+ if (! stricmp (oid, cipher->oids[i].oid))
+ {
+ if (algorithm)
+ *algorithm = module->mod_id;
+ if (oid_spec)
+ *oid_spec = cipher->oids[i];
+ ret = 1;
+ }
+ _gcry_module_release (module);
+ }
+
+ return ret;
+}
+
+/* Map STRING to the cipher algorithm identifier. Returns the
+ algorithm ID of the cipher for the given name or 0 if the name is
+ not known. It is valid to pass NULL for STRING which results in a
+ return value of 0. */
+int
+gcry_cipher_map_name (const char *string)
+{
+ gcry_module_t cipher;
+ int ret, algorithm = 0;
+
+ if (! string)
+ return 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ /* If the string starts with a digit (optionally prefixed with
+ either "OID." or "oid."), we first look into our table of ASN.1
+ object identifiers to figure out the algorithm */
+
+ ath_mutex_lock (&ciphers_registered_lock);
+
+ ret = search_oid (string, &algorithm, NULL);
+ if (! ret)
+ {
+ cipher = gcry_cipher_lookup_name (string);
+ if (cipher)
+ {
+ algorithm = cipher->mod_id;
+ _gcry_module_release (cipher);
+ }
+ }
+
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return algorithm;
+}
+
+
+/* Given a STRING with an OID in dotted decimal notation, this
+ function returns the cipher mode (GCRY_CIPHER_MODE_*) associated
+ with that OID or 0 if no mode is known. Passing NULL for string
+ yields a return value of 0. */
+int
+gcry_cipher_mode_from_oid (const char *string)
+{
+ gcry_cipher_oid_spec_t oid_spec;
+ int ret = 0, mode = 0;
+
+ if (!string)
+ return 0;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ ret = search_oid (string, NULL, &oid_spec);
+ if (ret)
+ mode = oid_spec.mode;
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return mode;
+}
+
+
+/* Map the cipher algorithm whose ID is contained in ALGORITHM to a
+ string representation of the algorithm name. For unknown algorithm
+ IDs this function returns "?". */
+static const char *
+cipher_algo_to_string (int algorithm)
+{
+ gcry_module_t cipher;
+ const char *name;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ name = ((gcry_cipher_spec_t *) cipher->spec)->name;
+ _gcry_module_release (cipher);
+ }
+ else
+ name = "?";
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return name;
+}
+
+/* Map the cipher algorithm identifier ALGORITHM to a string
+ representing this algorithm. This string is the default name as
+ used by Libgcrypt. An pointer to an empty string is returned for
+ an unknown algorithm. NULL is never returned. */
+const char *
+gcry_cipher_algo_name (int algorithm)
+{
+ return cipher_algo_to_string (algorithm);
+}
+
+
+/* Flag the cipher algorithm with the identifier ALGORITHM as
+ disabled. There is no error return, the function does nothing for
+ unknown algorithms. Disabled algorithms are vitually not available
+ in Libgcrypt. */
+static void
+disable_cipher_algo (int algorithm)
+{
+ gcry_module_t cipher;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ if (! (cipher->flags & FLAG_MODULE_DISABLED))
+ cipher->flags |= FLAG_MODULE_DISABLED;
+ _gcry_module_release (cipher);
+ }
+ ath_mutex_unlock (&ciphers_registered_lock);
+}
+
+
+/* Return 0 if the cipher algorithm with identifier ALGORITHM is
+ available. Returns a basic error code value if it is not
+ available. */
+static gcry_err_code_t
+check_cipher_algo (int algorithm)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+ gcry_module_t cipher;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ if (cipher->flags & FLAG_MODULE_DISABLED)
+ err = GPG_ERR_CIPHER_ALGO;
+ _gcry_module_release (cipher);
+ }
+ else
+ err = GPG_ERR_CIPHER_ALGO;
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return err;
+}
+
+
+/* Return the standard length of the key for the cipher algorithm with
+ the identifier ALGORITHM. This function expects a valid algorithm
+ and will abort if the algorithm is not available or the length of
+ the key is not known. */
+static unsigned int
+cipher_get_keylen (int algorithm)
+{
+ gcry_module_t cipher;
+ unsigned len = 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ len = ((gcry_cipher_spec_t *) cipher->spec)->keylen;
+ if (!len)
+ log_bug ("cipher %d w/o key length\n", algorithm);
+ _gcry_module_release (cipher);
+ }
+ else
+ log_bug ("cipher %d not found\n", algorithm);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return len;
+}
+
+/* Return the block length of the cipher algorithm with the identifier
+ ALGORITHM. This function expects a valid algorithm and will abort
+ if the algorithm is not available or the length of the key is not
+ known. */
+static unsigned int
+cipher_get_blocksize (int algorithm)
+{
+ gcry_module_t cipher;
+ unsigned len = 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ len = ((gcry_cipher_spec_t *) cipher->spec)->blocksize;
+ if (! len)
+ log_bug ("cipher %d w/o blocksize\n", algorithm);
+ _gcry_module_release (cipher);
+ }
+ else
+ log_bug ("cipher %d not found\n", algorithm);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return len;
+}
+
+
+/*
+ Open a cipher handle for use with cipher algorithm ALGORITHM, using
+ the cipher mode MODE (one of the GCRY_CIPHER_MODE_*) and return a
+ handle in HANDLE. Put NULL into HANDLE and return an error code if
+ something goes wrong. FLAGS may be used to modify the
+ operation. The defined flags are:
+
+ GCRY_CIPHER_SECURE: allocate all internal buffers in secure memory.
+ GCRY_CIPHER_ENABLE_SYNC: Enable the sync operation as used in OpenPGP.
+ GCRY_CIPHER_CBC_CTS: Enable CTS mode.
+ GCRY_CIPHER_CBC_MAC: Enable MAC mode.
+
+ Values for these flags may be combined using OR.
+ */
+gcry_error_t
+gcry_cipher_open (gcry_cipher_hd_t *handle,
+ int algo, int mode, unsigned int flags)
+{
+ int secure = (flags & GCRY_CIPHER_SECURE);
+ gcry_cipher_spec_t *cipher = NULL;
+ cipher_extra_spec_t *extraspec = NULL;
+ gcry_module_t module = NULL;
+ gcry_cipher_hd_t h = NULL;
+ gcry_err_code_t err = 0;
+
+ /* If the application missed to call the random poll function, we do
+ it here to ensure that it is used once in a while. */
+ _gcry_fast_random_poll ();
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ /* Fetch the according module and check whether the cipher is marked
+ available for use. */
+ ath_mutex_lock (&ciphers_registered_lock);
+ module = _gcry_module_lookup_id (ciphers_registered, algo);
+ if (module)
+ {
+ /* Found module. */
+
+ if (module->flags & FLAG_MODULE_DISABLED)
+ {
+ /* Not available for use. */
+ err = GPG_ERR_CIPHER_ALGO;
+ }
+ else
+ {
+ cipher = (gcry_cipher_spec_t *) module->spec;
+ extraspec = module->extraspec;
+ }
+ }
+ else
+ err = GPG_ERR_CIPHER_ALGO;
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ /* check flags */
+ if ((! err)
+ && ((flags & ~(0
+ | GCRY_CIPHER_SECURE
+ | GCRY_CIPHER_ENABLE_SYNC
+ | GCRY_CIPHER_CBC_CTS
+ | GCRY_CIPHER_CBC_MAC))
+ || (flags & GCRY_CIPHER_CBC_CTS & GCRY_CIPHER_CBC_MAC)))
+ err = GPG_ERR_CIPHER_ALGO;
+
+ /* check that a valid mode has been requested */
+ if (! err)
+ switch (mode)
+ {
+ case GCRY_CIPHER_MODE_ECB:
+ case GCRY_CIPHER_MODE_CBC:
+ case GCRY_CIPHER_MODE_CFB:
+ case GCRY_CIPHER_MODE_OFB:
+ case GCRY_CIPHER_MODE_CTR:
+ case GCRY_CIPHER_MODE_AESWRAP:
+ if ((cipher->encrypt == dummy_encrypt_block)
+ || (cipher->decrypt == dummy_decrypt_block))
+ err = GPG_ERR_INV_CIPHER_MODE;
+ break;
+
+ case GCRY_CIPHER_MODE_STREAM:
+ if ((cipher->stencrypt == dummy_encrypt_stream)
+ || (cipher->stdecrypt == dummy_decrypt_stream))
+ err = GPG_ERR_INV_CIPHER_MODE;
+ break;
+
+ case GCRY_CIPHER_MODE_NONE:
+ /* This mode may be used for debugging. It copies the main
+ text verbatim to the ciphertext. We do not allow this in
+ fips mode or if no debug flag has been set. */
+ if (fips_mode () || !_gcry_get_debug_flag (0))
+ err = GPG_ERR_INV_CIPHER_MODE;
+ break;
+
+ default:
+ err = GPG_ERR_INV_CIPHER_MODE;
+ }
+
+ /* Perform selftest here and mark this with a flag in cipher_table?
+ No, we should not do this as it takes too long. Further it does
+ not make sense to exclude algorithms with failing selftests at
+ runtime: If a selftest fails there is something seriously wrong
+ with the system and thus we better die immediately. */
+
+ if (! err)
+ {
+ size_t size = (sizeof (*h)
+ + 2 * cipher->contextsize
+ - sizeof (cipher_context_alignment_t)
+#ifdef NEED_16BYTE_ALIGNED_CONTEXT
+ + 15 /* Space for leading alignment gap. */
+#endif /*NEED_16BYTE_ALIGNED_CONTEXT*/
+ );
+
+ if (secure)
+ h = gcry_calloc_secure (1, size);
+ else
+ h = gcry_calloc (1, size);
+
+ if (! h)
+ err = gpg_err_code_from_errno (errno);
+ else
+ {
+ size_t off = 0;
+
+#ifdef NEED_16BYTE_ALIGNED_CONTEXT
+ if ( ((unsigned long)h & 0x0f) )
+ {
+ /* The malloced block is not aligned on a 16 byte
+ boundary. Correct for this. */
+ off = 16 - ((unsigned long)h & 0x0f);
+ h = (void*)((char*)h + off);
+ }
+#endif /*NEED_16BYTE_ALIGNED_CONTEXT*/
+
+ h->magic = secure ? CTX_MAGIC_SECURE : CTX_MAGIC_NORMAL;
+ h->actual_handle_size = size - off;
+ h->handle_offset = off;
+ h->cipher = cipher;
+ h->extraspec = extraspec;
+ h->module = module;
+ h->algo = algo;
+ h->mode = mode;
+ h->flags = flags;
+
+ /* Setup bulk encryption routines. */
+ switch (algo)
+ {
+#ifdef USE_AES
+ case GCRY_CIPHER_AES128:
+ case GCRY_CIPHER_AES192:
+ case GCRY_CIPHER_AES256:
+ h->bulk.cfb_enc = _gcry_aes_cfb_enc;
+ h->bulk.cfb_dec = _gcry_aes_cfb_dec;
+ h->bulk.cbc_enc = _gcry_aes_cbc_enc;
+ h->bulk.cbc_dec = _gcry_aes_cbc_dec;
+ break;
+#endif /*USE_AES*/
+
+ default:
+ break;
+ }
+ }
+ }
+
+ /* Done. */
+
+ if (err)
+ {
+ if (module)
+ {
+ /* Release module. */
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+ }
+ }
+
+ *handle = err ? NULL : h;
+
+ return gcry_error (err);
+}
+
+
+/* Release all resources associated with the cipher handle H. H may be
+ NULL in which case this is a no-operation. */
+void
+gcry_cipher_close (gcry_cipher_hd_t h)
+{
+ size_t off;
+
+ if (!h)
+ return;
+
+ if ((h->magic != CTX_MAGIC_SECURE)
+ && (h->magic != CTX_MAGIC_NORMAL))
+ _gcry_fatal_error(GPG_ERR_INTERNAL,
+ "gcry_cipher_close: already closed/invalid handle");
+ else
+ h->magic = 0;
+
+ /* Release module. */
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (h->module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ /* We always want to wipe out the memory even when the context has
+ been allocated in secure memory. The user might have disabled
+ secure memory or is using his own implementation which does not
+ do the wiping. To accomplish this we need to keep track of the
+ actual size of this structure because we have no way to known
+ how large the allocated area was when using a standard malloc. */
+ off = h->handle_offset;
+ wipememory (h, h->actual_handle_size);
+
+ gcry_free ((char*)h - off);
+}
+
+
+/* Set the key to be used for the encryption context C to KEY with
+ length KEYLEN. The length should match the required length. */
+static gcry_error_t
+cipher_setkey (gcry_cipher_hd_t c, byte *key, unsigned int keylen)
+{
+ gcry_err_code_t ret;
+
+ ret = (*c->cipher->setkey) (&c->context.c, key, keylen);
+ if (!ret)
+ {
+ /* Duplicate initial context. */
+ memcpy ((void *) ((char *) &c->context.c + c->cipher->contextsize),
+ (void *) &c->context.c,
+ c->cipher->contextsize);
+ c->marks.key = 1;
+ }
+ else
+ c->marks.key = 0;
+
+ return gcry_error (ret);
+}
+
+
+/* Set the IV to be used for the encryption context C to IV with
+ length IVLEN. The length should match the required length. */
+static void
+cipher_setiv( gcry_cipher_hd_t c, const byte *iv, unsigned ivlen )
+{
+ memset (c->u_iv.iv, 0, c->cipher->blocksize);
+ if (iv)
+ {
+ if (ivlen != c->cipher->blocksize)
+ {
+ log_info ("WARNING: cipher_setiv: ivlen=%u blklen=%u\n",
+ ivlen, (unsigned int)c->cipher->blocksize);
+ fips_signal_error ("IV length does not match blocklength");
+ }
+ if (ivlen > c->cipher->blocksize)
+ ivlen = c->cipher->blocksize;
+ memcpy (c->u_iv.iv, iv, ivlen);
+ c->marks.iv = 1;
+ }
+ else
+ c->marks.iv = 0;
+ c->unused = 0;
+}
+
+
+/* Reset the cipher context to the initial context. This is basically
+ the same as an release followed by a new. */
+static void
+cipher_reset (gcry_cipher_hd_t c)
+{
+ memcpy (&c->context.c,
+ (char *) &c->context.c + c->cipher->contextsize,
+ c->cipher->contextsize);
+ memset (&c->marks, 0, sizeof c->marks);
+ memset (c->u_iv.iv, 0, c->cipher->blocksize);
+ memset (c->lastiv, 0, c->cipher->blocksize);
+ memset (c->ctr, 0, c->cipher->blocksize);
+}
+
+
+
+static gcry_err_code_t
+do_ecb_encrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned int blocksize = c->cipher->blocksize;
+ unsigned int n, nblocks;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+ if ((inbuflen % blocksize))
+ return GPG_ERR_INV_LENGTH;
+
+ nblocks = inbuflen / c->cipher->blocksize;
+
+ for (n=0; n < nblocks; n++ )
+ {
+ c->cipher->encrypt (&c->context.c, outbuf, (byte*)/*arggg*/inbuf);
+ inbuf += blocksize;
+ outbuf += blocksize;
+ }
+ return 0;
+}
+
+static gcry_err_code_t
+do_ecb_decrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned int blocksize = c->cipher->blocksize;
+ unsigned int n, nblocks;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+ if ((inbuflen % blocksize))
+ return GPG_ERR_INV_LENGTH;
+ nblocks = inbuflen / c->cipher->blocksize;
+
+ for (n=0; n < nblocks; n++ )
+ {
+ c->cipher->decrypt (&c->context.c, outbuf, (byte*)/*arggg*/inbuf );
+ inbuf += blocksize;
+ outbuf += blocksize;
+ }
+
+ return 0;
+}
+
+
+static gcry_err_code_t
+do_cbc_encrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned int n;
+ unsigned char *ivp;
+ int i;
+ size_t blocksize = c->cipher->blocksize;
+ unsigned nblocks = inbuflen / blocksize;
+
+ if (outbuflen < ((c->flags & GCRY_CIPHER_CBC_MAC)? blocksize : inbuflen))
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if ((inbuflen % c->cipher->blocksize)
+ && !(inbuflen > c->cipher->blocksize
+ && (c->flags & GCRY_CIPHER_CBC_CTS)))
+ return GPG_ERR_INV_LENGTH;
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && inbuflen > blocksize)
+ {
+ if ((inbuflen % blocksize) == 0)
+ nblocks--;
+ }
+
+ if (c->bulk.cbc_enc)
+ {
+ c->bulk.cbc_enc (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks,
+ (c->flags & GCRY_CIPHER_CBC_MAC));
+ inbuf += nblocks * blocksize;
+ if (!(c->flags & GCRY_CIPHER_CBC_MAC))
+ outbuf += nblocks * blocksize;
+ }
+ else
+ {
+ for (n=0; n < nblocks; n++ )
+ {
+ for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ outbuf[i] = inbuf[i] ^ *ivp++;
+ c->cipher->encrypt ( &c->context.c, outbuf, outbuf );
+ memcpy (c->u_iv.iv, outbuf, blocksize );
+ inbuf += blocksize;
+ if (!(c->flags & GCRY_CIPHER_CBC_MAC))
+ outbuf += blocksize;
+ }
+ }
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && inbuflen > blocksize)
+ {
+ /* We have to be careful here, since outbuf might be equal to
+ inbuf. */
+ int restbytes;
+ unsigned char b;
+
+ if ((inbuflen % blocksize) == 0)
+ restbytes = blocksize;
+ else
+ restbytes = inbuflen % blocksize;
+
+ outbuf -= blocksize;
+ for (ivp = c->u_iv.iv, i = 0; i < restbytes; i++)
+ {
+ b = inbuf[i];
+ outbuf[blocksize + i] = outbuf[i];
+ outbuf[i] = b ^ *ivp++;
+ }
+ for (; i < blocksize; i++)
+ outbuf[i] = 0 ^ *ivp++;
+
+ c->cipher->encrypt (&c->context.c, outbuf, outbuf);
+ memcpy (c->u_iv.iv, outbuf, blocksize);
+ }
+
+ return 0;
+}
+
+
+static gcry_err_code_t
+do_cbc_decrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned int n;
+ unsigned char *ivp;
+ int i;
+ size_t blocksize = c->cipher->blocksize;
+ unsigned int nblocks = inbuflen / blocksize;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if ((inbuflen % c->cipher->blocksize)
+ && !(inbuflen > c->cipher->blocksize
+ && (c->flags & GCRY_CIPHER_CBC_CTS)))
+ return GPG_ERR_INV_LENGTH;
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && inbuflen > blocksize)
+ {
+ nblocks--;
+ if ((inbuflen % blocksize) == 0)
+ nblocks--;
+ memcpy (c->lastiv, c->u_iv.iv, blocksize);
+ }
+
+ if (c->bulk.cbc_dec)
+ {
+ c->bulk.cbc_dec (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks);
+ inbuf += nblocks * blocksize;
+ outbuf += nblocks * blocksize;
+ }
+ else
+ {
+ for (n=0; n < nblocks; n++ )
+ {
+ /* Because outbuf and inbuf might be the same, we have to
+ * save the original ciphertext block. We use LASTIV for
+ * this here because it is not used otherwise. */
+ memcpy (c->lastiv, inbuf, blocksize);
+ c->cipher->decrypt ( &c->context.c, outbuf, inbuf );
+ for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ outbuf[i] ^= *ivp++;
+ memcpy(c->u_iv.iv, c->lastiv, blocksize );
+ inbuf += c->cipher->blocksize;
+ outbuf += c->cipher->blocksize;
+ }
+ }
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && inbuflen > blocksize)
+ {
+ int restbytes;
+
+ if ((inbuflen % blocksize) == 0)
+ restbytes = blocksize;
+ else
+ restbytes = inbuflen % blocksize;
+
+ memcpy (c->lastiv, c->u_iv.iv, blocksize ); /* Save Cn-2. */
+ memcpy (c->u_iv.iv, inbuf + blocksize, restbytes ); /* Save Cn. */
+
+ c->cipher->decrypt ( &c->context.c, outbuf, inbuf );
+ for (ivp=c->u_iv.iv,i=0; i < restbytes; i++ )
+ outbuf[i] ^= *ivp++;
+
+ memcpy(outbuf + blocksize, outbuf, restbytes);
+ for(i=restbytes; i < blocksize; i++)
+ c->u_iv.iv[i] = outbuf[i];
+ c->cipher->decrypt (&c->context.c, outbuf, c->u_iv.iv);
+ for(ivp=c->lastiv,i=0; i < blocksize; i++ )
+ outbuf[i] ^= *ivp++;
+ /* c->lastiv is now really lastlastiv, does this matter? */
+ }
+
+ return 0;
+}
+
+
+static gcry_err_code_t
+do_cfb_encrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned char *ivp;
+ size_t blocksize = c->cipher->blocksize;
+ size_t blocksize_x_2 = blocksize + blocksize;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if ( inbuflen <= c->unused )
+ {
+ /* Short enough to be encoded by the remaining XOR mask. */
+ /* XOR the input with the IV and store input into IV. */
+ for (ivp=c->u_iv.iv+c->cipher->blocksize - c->unused;
+ inbuflen;
+ inbuflen--, c->unused-- )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ return 0;
+ }
+
+ if ( c->unused )
+ {
+ /* XOR the input with the IV and store input into IV */
+ inbuflen -= c->unused;
+ for(ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ }
+
+ /* Now we can process complete blocks. We use a loop as long as we
+ have at least 2 blocks and use conditions for the rest. This
+ also allows to use a bulk encryption function if available. */
+ if (inbuflen >= blocksize_x_2 && c->bulk.cfb_enc)
+ {
+ unsigned int nblocks = inbuflen / blocksize;
+ c->bulk.cfb_enc (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks);
+ outbuf += nblocks * blocksize;
+ inbuf += nblocks * blocksize;
+ inbuflen -= nblocks * blocksize;
+ }
+ else
+ {
+ while ( inbuflen >= blocksize_x_2 )
+ {
+ int i;
+ /* Encrypt the IV. */
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ /* XOR the input with the IV and store input into IV. */
+ for(ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ inbuflen -= blocksize;
+ }
+ }
+
+ if ( inbuflen >= blocksize )
+ {
+ int i;
+ /* Save the current IV and then encrypt the IV. */
+ memcpy( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ /* XOR the input with the IV and store input into IV */
+ for(ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ inbuflen -= blocksize;
+ }
+ if ( inbuflen )
+ {
+ /* Save the current IV and then encrypt the IV. */
+ memcpy( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ c->unused = blocksize;
+ /* Apply the XOR. */
+ c->unused -= inbuflen;
+ for(ivp=c->u_iv.iv; inbuflen; inbuflen-- )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ }
+ return 0;
+}
+
+
+static gcry_err_code_t
+do_cfb_decrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned char *ivp;
+ unsigned long temp;
+ int i;
+ size_t blocksize = c->cipher->blocksize;
+ size_t blocksize_x_2 = blocksize + blocksize;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if (inbuflen <= c->unused)
+ {
+ /* Short enough to be encoded by the remaining XOR mask. */
+ /* XOR the input with the IV and store input into IV. */
+ for (ivp=c->u_iv.iv+blocksize - c->unused;
+ inbuflen;
+ inbuflen--, c->unused--)
+ {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ return 0;
+ }
+
+ if (c->unused)
+ {
+ /* XOR the input with the IV and store input into IV. */
+ inbuflen -= c->unused;
+ for (ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- )
+ {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ }
+
+ /* Now we can process complete blocks. We use a loop as long as we
+ have at least 2 blocks and use conditions for the rest. This
+ also allows to use a bulk encryption function if available. */
+ if (inbuflen >= blocksize_x_2 && c->bulk.cfb_dec)
+ {
+ unsigned int nblocks = inbuflen / blocksize;
+ c->bulk.cfb_dec (&c->context.c, c->u_iv.iv, outbuf, inbuf, nblocks);
+ outbuf += nblocks * blocksize;
+ inbuf += nblocks * blocksize;
+ inbuflen -= nblocks * blocksize;
+ }
+ else
+ {
+ while (inbuflen >= blocksize_x_2 )
+ {
+ /* Encrypt the IV. */
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ /* XOR the input with the IV and store input into IV. */
+ for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ inbuflen -= blocksize;
+ }
+ }
+
+ if (inbuflen >= blocksize )
+ {
+ /* Save the current IV and then encrypt the IV. */
+ memcpy ( c->lastiv, c->u_iv.iv, blocksize);
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ /* XOR the input with the IV and store input into IV */
+ for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ inbuflen -= blocksize;
+ }
+
+ if (inbuflen)
+ {
+ /* Save the current IV and then encrypt the IV. */
+ memcpy ( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ c->unused = blocksize;
+ /* Apply the XOR. */
+ c->unused -= inbuflen;
+ for (ivp=c->u_iv.iv; inbuflen; inbuflen-- )
+ {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ }
+ return 0;
+}
+
+
+static gcry_err_code_t
+do_ofb_encrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned char *ivp;
+ size_t blocksize = c->cipher->blocksize;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if ( inbuflen <= c->unused )
+ {
+ /* Short enough to be encoded by the remaining XOR mask. */
+ /* XOR the input with the IV */
+ for (ivp=c->u_iv.iv+c->cipher->blocksize - c->unused;
+ inbuflen;
+ inbuflen--, c->unused-- )
+ *outbuf++ = (*ivp++ ^ *inbuf++);
+ return 0;
+ }
+
+ if( c->unused )
+ {
+ inbuflen -= c->unused;
+ for(ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- )
+ *outbuf++ = (*ivp++ ^ *inbuf++);
+ }
+
+ /* Now we can process complete blocks. */
+ while ( inbuflen >= blocksize )
+ {
+ int i;
+ /* Encrypt the IV (and save the current one). */
+ memcpy( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+
+ for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ *outbuf++ = (*ivp++ ^ *inbuf++);
+ inbuflen -= blocksize;
+ }
+ if ( inbuflen )
+ { /* process the remaining bytes */
+ memcpy( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ c->unused = blocksize;
+ c->unused -= inbuflen;
+ for(ivp=c->u_iv.iv; inbuflen; inbuflen-- )
+ *outbuf++ = (*ivp++ ^ *inbuf++);
+ }
+ return 0;
+}
+
+static gcry_err_code_t
+do_ofb_decrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned char *ivp;
+ size_t blocksize = c->cipher->blocksize;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if( inbuflen <= c->unused )
+ {
+ /* Short enough to be encoded by the remaining XOR mask. */
+ for (ivp=c->u_iv.iv+blocksize - c->unused; inbuflen; inbuflen--,c->unused--)
+ *outbuf++ = *ivp++ ^ *inbuf++;
+ return 0;
+ }
+
+ if ( c->unused )
+ {
+ inbuflen -= c->unused;
+ for (ivp=c->u_iv.iv+blocksize - c->unused; c->unused; c->unused-- )
+ *outbuf++ = *ivp++ ^ *inbuf++;
+ }
+
+ /* Now we can process complete blocks. */
+ while ( inbuflen >= blocksize )
+ {
+ int i;
+ /* Encrypt the IV (and save the current one). */
+ memcpy( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ for (ivp=c->u_iv.iv,i=0; i < blocksize; i++ )
+ *outbuf++ = *ivp++ ^ *inbuf++;
+ inbuflen -= blocksize;
+ }
+ if ( inbuflen )
+ { /* Process the remaining bytes. */
+ /* Encrypt the IV (and save the current one). */
+ memcpy( c->lastiv, c->u_iv.iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->u_iv.iv, c->u_iv.iv );
+ c->unused = blocksize;
+ c->unused -= inbuflen;
+ for (ivp=c->u_iv.iv; inbuflen; inbuflen-- )
+ *outbuf++ = *ivp++ ^ *inbuf++;
+ }
+ return 0;
+}
+
+
+static gcry_err_code_t
+do_ctr_encrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ unsigned int n;
+ unsigned char tmp[MAX_BLOCKSIZE];
+ int i;
+ unsigned int blocksize = c->cipher->blocksize;
+
+ if (outbuflen < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+
+ if ((inbuflen % blocksize))
+ return GPG_ERR_INV_LENGTH;
+
+ for (n=0; n < inbuflen; n++)
+ {
+ if ((n % blocksize) == 0)
+ {
+ c->cipher->encrypt (&c->context.c, tmp, c->ctr);
+
+ for (i = blocksize; i > 0; i--)
+ {
+ c->ctr[i-1]++;
+ if (c->ctr[i-1] != 0)
+ break;
+ }
+ }
+
+ /* XOR input with encrypted counter and store in output. */
+ outbuf[n] = inbuf[n] ^ tmp[n % blocksize];
+ }
+
+ wipememory (tmp, sizeof tmp);
+ return 0;
+}
+
+static gcry_err_code_t
+do_ctr_decrypt (gcry_cipher_hd_t c,
+ unsigned char *outbuf, unsigned int outbuflen,
+ const unsigned char *inbuf, unsigned int inbuflen)
+{
+ return do_ctr_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+}
+
+
+/* Perform the AES-Wrap algorithm as specified by RFC3394. We
+ implement this as a mode usable with any cipher algorithm of
+ blocksize 128. */
+static gcry_err_code_t
+do_aeswrap_encrypt (gcry_cipher_hd_t c, byte *outbuf, unsigned int outbuflen,
+ const byte *inbuf, unsigned int inbuflen )
+{
+ int j, x;
+ unsigned int n, i;
+ unsigned char *r, *a, *b;
+ unsigned char t[8];
+
+#if MAX_BLOCKSIZE < 8
+#error Invalid block size
+#endif
+ /* We require a cipher with a 128 bit block length. */
+ if (c->cipher->blocksize != 16)
+ return GPG_ERR_INV_LENGTH;
+
+ /* The output buffer must be able to hold the input data plus one
+ additional block. */
+ if (outbuflen < inbuflen + 8)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+ /* Input data must be multiple of 64 bits. */
+ if (inbuflen % 8)
+ return GPG_ERR_INV_ARG;
+
+ n = inbuflen / 8;
+
+ /* We need at least two 64 bit blocks. */
+ if (n < 2)
+ return GPG_ERR_INV_ARG;
+
+ r = outbuf;
+ a = outbuf; /* We store A directly in OUTBUF. */
+ b = c->ctr; /* B is also used to concatenate stuff. */
+
+ /* If an IV has been set we use that IV as the Alternative Initial
+ Value; if it has not been set we use the standard value. */
+ if (c->marks.iv)
+ memcpy (a, c->u_iv.iv, 8);
+ else
+ memset (a, 0xa6, 8);
+
+ /* Copy the inbuf to the outbuf. */
+ memmove (r+8, inbuf, inbuflen);
+
+ memset (t, 0, sizeof t); /* t := 0. */
+
+ for (j = 0; j <= 5; j++)
+ {
+ for (i = 1; i <= n; i++)
+ {
+ /* B := AES_k( A | R[i] ) */
+ memcpy (b, a, 8);
+ memcpy (b+8, r+i*8, 8);
+ c->cipher->encrypt (&c->context.c, b, b);
+ /* t := t + 1 */
+ for (x = 7; x >= 0; x--)
+ {
+ t[x]++;
+ if (t[x])
+ break;
+ }
+ /* A := MSB_64(B) ^ t */
+ for (x=0; x < 8; x++)
+ a[x] = b[x] ^ t[x];
+ /* R[i] := LSB_64(B) */
+ memcpy (r+i*8, b+8, 8);
+ }
+ }
+
+ return 0;
+}
+
+/* Perform the AES-Unwrap algorithm as specified by RFC3394. We
+ implement this as a mode usable with any cipher algorithm of
+ blocksize 128. */
+static gcry_err_code_t
+do_aeswrap_decrypt (gcry_cipher_hd_t c, byte *outbuf, unsigned int outbuflen,
+ const byte *inbuf, unsigned int inbuflen)
+{
+ int j, x;
+ unsigned int n, i;
+ unsigned char *r, *a, *b;
+ unsigned char t[8];
+
+#if MAX_BLOCKSIZE < 8
+#error Invalid block size
+#endif
+ /* We require a cipher with a 128 bit block length. */
+ if (c->cipher->blocksize != 16)
+ return GPG_ERR_INV_LENGTH;
+
+ /* The output buffer must be able to hold the input data minus one
+ additional block. Fixme: The caller has more restrictive checks
+ - we may want to fix them for this mode. */
+ if (outbuflen + 8 < inbuflen)
+ return GPG_ERR_BUFFER_TOO_SHORT;
+ /* Input data must be multiple of 64 bits. */
+ if (inbuflen % 8)
+ return GPG_ERR_INV_ARG;
+
+ n = inbuflen / 8;
+
+ /* We need at least three 64 bit blocks. */
+ if (n < 3)
+ return GPG_ERR_INV_ARG;
+
+ r = outbuf;
+ a = c->lastiv; /* We use c->LASTIV as buffer for A. */
+ b = c->ctr; /* B is also used to concatenate stuff. */
+
+ /* Copy the inbuf to the outbuf and save A. */
+ memcpy (a, inbuf, 8);
+ memmove (r, inbuf+8, inbuflen-8);
+ n--; /* Reduce to actual number of data blocks. */
+
+ /* t := 6 * n */
+ i = n * 6; /* The range is valid because: n = inbuflen / 8 - 1. */
+ for (x=0; x < 8 && x < sizeof (i); x++)
+ t[7-x] = i >> (8*x);
+ for (; x < 8; x++)
+ t[7-x] = 0;
+
+ for (j = 5; j >= 0; j--)
+ {
+ for (i = n; i >= 1; i--)
+ {
+ /* B := AES_k^1( (A ^ t)| R[i] ) */
+ for (x = 0; x < 8; x++)
+ b[x] = a[x] ^ t[x];
+ memcpy (b+8, r+(i-1)*8, 8);
+ c->cipher->decrypt (&c->context.c, b, b);
+ /* t := t - 1 */
+ for (x = 7; x >= 0; x--)
+ {
+ t[x]--;
+ if (t[x] != 0xff)
+ break;
+ }
+ /* A := MSB_64(B) */
+ memcpy (a, b, 8);
+ /* R[i] := LSB_64(B) */
+ memcpy (r+(i-1)*8, b+8, 8);
+ }
+ }
+
+ /* If an IV has been set we compare against this Alternative Initial
+ Value; if it has not been set we compare against the standard IV. */
+ if (c->marks.iv)
+ j = memcmp (a, c->u_iv.iv, 8);
+ else
+ {
+ for (j=0, x=0; x < 8; x++)
+ if (a[x] != 0xa6)
+ {
+ j=1;
+ break;
+ }
+ }
+ return j? GPG_ERR_CHECKSUM : 0;
+}
+
+
+/****************
+ * Encrypt INBUF to OUTBUF with the mode selected at open.
+ * inbuf and outbuf may overlap or be the same.
+ * Depending on the mode some constraints apply to INBUFLEN.
+ */
+static gcry_err_code_t
+cipher_encrypt (gcry_cipher_hd_t c, byte *outbuf, unsigned int outbuflen,
+ const byte *inbuf, unsigned int inbuflen)
+{
+ gcry_err_code_t rc;
+
+ switch (c->mode)
+ {
+ case GCRY_CIPHER_MODE_ECB:
+ rc = do_ecb_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_CBC:
+ rc = do_cbc_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_CFB:
+ rc = do_cfb_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_OFB:
+ rc = do_ofb_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_CTR:
+ rc = do_ctr_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_AESWRAP:
+ rc = do_aeswrap_encrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_STREAM:
+ c->cipher->stencrypt (&c->context.c,
+ outbuf, (byte*)/*arggg*/inbuf, inbuflen);
+ rc = 0;
+ break;
+
+ case GCRY_CIPHER_MODE_NONE:
+ if (fips_mode () || !_gcry_get_debug_flag (0))
+ {
+ fips_signal_error ("cipher mode NONE used");
+ rc = GPG_ERR_INV_CIPHER_MODE;
+ }
+ else
+ {
+ if (inbuf != outbuf)
+ memmove (outbuf, inbuf, inbuflen);
+ rc = 0;
+ }
+ break;
+
+ default:
+ log_fatal ("cipher_encrypt: invalid mode %d\n", c->mode );
+ rc = GPG_ERR_INV_CIPHER_MODE;
+ break;
+ }
+
+ return rc;
+}
+
+
+/****************
+ * Encrypt IN and write it to OUT. If IN is NULL, in-place encryption has
+ * been requested.
+ */
+gcry_error_t
+gcry_cipher_encrypt (gcry_cipher_hd_t h, void *out, size_t outsize,
+ const void *in, size_t inlen)
+{
+ gcry_err_code_t err;
+
+ if (!in) /* Caller requested in-place encryption. */
+ err = cipher_encrypt (h, out, outsize, out, outsize);
+ else
+ err = cipher_encrypt (h, out, outsize, in, inlen);
+
+ /* Failsafe: Make sure that the plaintext will never make it into
+ OUT if the encryption returned an error. */
+ if (err && out)
+ memset (out, 0x42, outsize);
+
+ return gcry_error (err);
+}
+
+
+
+/****************
+ * Decrypt INBUF to OUTBUF with the mode selected at open.
+ * inbuf and outbuf may overlap or be the same.
+ * Depending on the mode some some contraints apply to INBUFLEN.
+ */
+static gcry_err_code_t
+cipher_decrypt (gcry_cipher_hd_t c, byte *outbuf, unsigned int outbuflen,
+ const byte *inbuf, unsigned int inbuflen)
+{
+ gcry_err_code_t rc;
+
+ switch (c->mode)
+ {
+ case GCRY_CIPHER_MODE_ECB:
+ rc = do_ecb_decrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_CBC:
+ rc = do_cbc_decrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_CFB:
+ rc = do_cfb_decrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_OFB:
+ rc = do_ofb_decrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_CTR:
+ rc = do_ctr_decrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_AESWRAP:
+ rc = do_aeswrap_decrypt (c, outbuf, outbuflen, inbuf, inbuflen);
+ break;
+
+ case GCRY_CIPHER_MODE_STREAM:
+ c->cipher->stdecrypt (&c->context.c,
+ outbuf, (byte*)/*arggg*/inbuf, inbuflen);
+ rc = 0;
+ break;
+
+ case GCRY_CIPHER_MODE_NONE:
+ if (fips_mode () || !_gcry_get_debug_flag (0))
+ {
+ fips_signal_error ("cipher mode NONE used");
+ rc = GPG_ERR_INV_CIPHER_MODE;
+ }
+ else
+ {
+ if (inbuf != outbuf)
+ memmove (outbuf, inbuf, inbuflen);
+ rc = 0;
+ }
+ break;
+
+ default:
+ log_fatal ("cipher_decrypt: invalid mode %d\n", c->mode );
+ rc = GPG_ERR_INV_CIPHER_MODE;
+ break;
+ }
+
+ return rc;
+}
+
+
+gcry_error_t
+gcry_cipher_decrypt (gcry_cipher_hd_t h, void *out, size_t outsize,
+ const void *in, size_t inlen)
+{
+ gcry_err_code_t err;
+
+ if (!in) /* Caller requested in-place encryption. */
+ err = cipher_decrypt (h, out, outsize, out, outsize);
+ else
+ err = cipher_decrypt (h, out, outsize, in, inlen);
+
+ return gcry_error (err);
+}
+
+
+
+/****************
+ * Used for PGP's somewhat strange CFB mode. Only works if
+ * the corresponding flag is set.
+ */
+static void
+cipher_sync (gcry_cipher_hd_t c)
+{
+ if ((c->flags & GCRY_CIPHER_ENABLE_SYNC) && c->unused)
+ {
+ memmove (c->u_iv.iv + c->unused,
+ c->u_iv.iv, c->cipher->blocksize - c->unused);
+ memcpy (c->u_iv.iv,
+ c->lastiv + c->cipher->blocksize - c->unused, c->unused);
+ c->unused = 0;
+ }
+}
+
+
+gcry_error_t
+_gcry_cipher_setkey (gcry_cipher_hd_t hd, const void *key, size_t keylen)
+{
+ return cipher_setkey (hd, (void*)key, keylen);
+}
+
+
+gcry_error_t
+_gcry_cipher_setiv (gcry_cipher_hd_t hd, const void *iv, size_t ivlen)
+{
+ cipher_setiv (hd, iv, ivlen);
+ return 0;
+}
+
+/* Set counter for CTR mode. (CTR,CTRLEN) must denote a buffer of
+ block size length, or (NULL,0) to set the CTR to the all-zero
+ block. */
+gpg_error_t
+_gcry_cipher_setctr (gcry_cipher_hd_t hd, const void *ctr, size_t ctrlen)
+{
+ if (ctr && ctrlen == hd->cipher->blocksize)
+ memcpy (hd->ctr, ctr, hd->cipher->blocksize);
+ else if (!ctr || !ctrlen)
+ memset (hd->ctr, 0, hd->cipher->blocksize);
+ else
+ return gpg_error (GPG_ERR_INV_ARG);
+ return 0;
+}
+
+
+gcry_error_t
+gcry_cipher_ctl( gcry_cipher_hd_t h, int cmd, void *buffer, size_t buflen)
+{
+ gcry_err_code_t rc = GPG_ERR_NO_ERROR;
+
+ switch (cmd)
+ {
+ case GCRYCTL_SET_KEY: /* Deprecated; use gcry_cipher_setkey. */
+ rc = cipher_setkey( h, buffer, buflen );
+ break;
+
+ case GCRYCTL_SET_IV: /* Deprecated; use gcry_cipher_setiv. */
+ cipher_setiv( h, buffer, buflen );
+ break;
+
+ case GCRYCTL_RESET:
+ cipher_reset (h);
+ break;
+
+ case GCRYCTL_CFB_SYNC:
+ cipher_sync( h );
+ break;
+
+ case GCRYCTL_SET_CBC_CTS:
+ if (buflen)
+ if (h->flags & GCRY_CIPHER_CBC_MAC)
+ rc = GPG_ERR_INV_FLAG;
+ else
+ h->flags |= GCRY_CIPHER_CBC_CTS;
+ else
+ h->flags &= ~GCRY_CIPHER_CBC_CTS;
+ break;
+
+ case GCRYCTL_SET_CBC_MAC:
+ if (buflen)
+ if (h->flags & GCRY_CIPHER_CBC_CTS)
+ rc = GPG_ERR_INV_FLAG;
+ else
+ h->flags |= GCRY_CIPHER_CBC_MAC;
+ else
+ h->flags &= ~GCRY_CIPHER_CBC_MAC;
+ break;
+
+ case GCRYCTL_DISABLE_ALGO:
+ /* This command expects NULL for H and BUFFER to point to an
+ integer with the algo number. */
+ if( h || !buffer || buflen != sizeof(int) )
+ return gcry_error (GPG_ERR_CIPHER_ALGO);
+ disable_cipher_algo( *(int*)buffer );
+ break;
+
+ case GCRYCTL_SET_CTR: /* Deprecated; use gcry_cipher_setctr. */
+ if (buffer && buflen == h->cipher->blocksize)
+ memcpy (h->ctr, buffer, h->cipher->blocksize);
+ else if (buffer == NULL || buflen == 0)
+ memset (h->ctr, 0, h->cipher->blocksize);
+ else
+ rc = GPG_ERR_INV_ARG;
+ break;
+
+ case 61: /* Disable weak key detection (private). */
+ if (h->extraspec->set_extra_info)
+ rc = h->extraspec->set_extra_info
+ (&h->context.c, CIPHER_INFO_NO_WEAK_KEY, NULL, 0);
+ else
+ rc = GPG_ERR_NOT_SUPPORTED;
+ break;
+
+ case 62: /* Return current input vector (private). */
+ /* This is the input block as used in CFB and OFB mode which has
+ initially been set as IV. The returned format is:
+ 1 byte Actual length of the block in bytes.
+ n byte The block.
+ If the provided buffer is too short, an error is returned. */
+ if (buflen < (1 + h->cipher->blocksize))
+ rc = GPG_ERR_TOO_SHORT;
+ else
+ {
+ unsigned char *ivp;
+ unsigned char *dst = buffer;
+ int n = h->unused;
+
+ if (!n)
+ n = h->cipher->blocksize;
+ gcry_assert (n <= h->cipher->blocksize);
+ *dst++ = n;
+ ivp = h->u_iv.iv + h->cipher->blocksize - n;
+ while (n--)
+ *dst++ = *ivp++;
+ }
+ break;
+
+ default:
+ rc = GPG_ERR_INV_OP;
+ }
+
+ return gcry_error (rc);
+}
+
+
+/* Return information about the cipher handle H. CMD is the kind of
+ information requested. BUFFER and NBYTES are reserved for now.
+
+ There are no values for CMD yet defined.
+
+ The function always returns GPG_ERR_INV_OP.
+
+ */
+gcry_error_t
+gcry_cipher_info (gcry_cipher_hd_t h, int cmd, void *buffer, size_t *nbytes)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ (void)h;
+ (void)buffer;
+ (void)nbytes;
+
+ switch (cmd)
+ {
+ default:
+ err = GPG_ERR_INV_OP;
+ }
+
+ return gcry_error (err);
+}
+
+/* Return information about the given cipher algorithm ALGO.
+
+ WHAT select the kind of information returned:
+
+ GCRYCTL_GET_KEYLEN:
+ Return the length of the key. If the algorithm ALGO
+ supports multiple key lengths, the maximum supported key length
+ is returned. The key length is returned as number of octets.
+ BUFFER and NBYTES must be zero.
+
+ GCRYCTL_GET_BLKLEN:
+ Return the blocklength of the algorithm ALGO counted in octets.
+ BUFFER and NBYTES must be zero.
+
+ GCRYCTL_TEST_ALGO:
+ Returns 0 if the specified algorithm ALGO is available for use.
+ BUFFER and NBYTES must be zero.
+
+ Note: Because this function is in most cases used to return an
+ integer value, we can make it easier for the caller to just look at
+ the return value. The caller will in all cases consult the value
+ and thereby detecting whether a error occurred or not (i.e. while
+ checking the block size)
+ */
+gcry_error_t
+gcry_cipher_algo_info (int algo, int what, void *buffer, size_t *nbytes)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+ unsigned int ui;
+
+ switch (what)
+ {
+ case GCRYCTL_GET_KEYLEN:
+ if (buffer || (! nbytes))
+ err = GPG_ERR_CIPHER_ALGO;
+ else
+ {
+ ui = cipher_get_keylen (algo);
+ if ((ui > 0) && (ui <= 512))
+ *nbytes = (size_t) ui / 8;
+ else
+ /* The only reason is an invalid algo or a strange
+ blocksize. */
+ err = GPG_ERR_CIPHER_ALGO;
+ }
+ break;
+
+ case GCRYCTL_GET_BLKLEN:
+ if (buffer || (! nbytes))
+ err = GPG_ERR_CIPHER_ALGO;
+ else
+ {
+ ui = cipher_get_blocksize (algo);
+ if ((ui > 0) && (ui < 10000))
+ *nbytes = ui;
+ else
+ /* The only reason is an invalid algo or a strange
+ blocksize. */
+ err = GPG_ERR_CIPHER_ALGO;
+ }
+ break;
+
+ case GCRYCTL_TEST_ALGO:
+ if (buffer || nbytes)
+ err = GPG_ERR_INV_ARG;
+ else
+ err = check_cipher_algo (algo);
+ break;
+
+ default:
+ err = GPG_ERR_INV_OP;
+ }
+
+ return gcry_error (err);
+}
+
+
+/* This function returns length of the key for algorithm ALGO. If the
+ algorithm supports multiple key lengths, the maximum supported key
+ length is returned. On error 0 is returned. The key length is
+ returned as number of octets.
+
+ This is a convenience functions which should be preferred over
+ gcry_cipher_algo_info because it allows for proper type
+ checking. */
+size_t
+gcry_cipher_get_algo_keylen (int algo)
+{
+ size_t n;
+
+ if (gcry_cipher_algo_info (algo, GCRYCTL_GET_KEYLEN, NULL, &n))
+ n = 0;
+ return n;
+}
+
+/* This functions returns the blocklength of the algorithm ALGO
+ counted in octets. On error 0 is returned.
+
+ This is a convenience functions which should be preferred over
+ gcry_cipher_algo_info because it allows for proper type
+ checking. */
+size_t
+gcry_cipher_get_algo_blklen (int algo)
+{
+ size_t n;
+
+ if (gcry_cipher_algo_info( algo, GCRYCTL_GET_BLKLEN, NULL, &n))
+ n = 0;
+ return n;
+}
+
+/* Explicitly initialize this module. */
+gcry_err_code_t
+_gcry_cipher_init (void)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ return err;
+}
+
+/* Get a list consisting of the IDs of the loaded cipher modules. If
+ LIST is zero, write the number of loaded cipher modules to
+ LIST_LENGTH and return. If LIST is non-zero, the first
+ *LIST_LENGTH algorithm IDs are stored in LIST, which must be of
+ according size. In case there are less cipher modules than
+ *LIST_LENGTH, *LIST_LENGTH is updated to the correct number. */
+gcry_error_t
+gcry_cipher_list (int *list, int *list_length)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ err = _gcry_module_list (ciphers_registered, list, list_length);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return err;
+}
+
+
+/* Run the selftests for cipher algorithm ALGO with optional reporting
+ function REPORT. */
+gpg_error_t
+_gcry_cipher_selftest (int algo, int extended, selftest_report_func_t report)
+{
+ gcry_module_t module = NULL;
+ cipher_extra_spec_t *extraspec = NULL;
+ gcry_err_code_t ec = 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ module = _gcry_module_lookup_id (ciphers_registered, algo);
+ if (module && !(module->flags & FLAG_MODULE_DISABLED))
+ extraspec = module->extraspec;
+ ath_mutex_unlock (&ciphers_registered_lock);
+ if (extraspec && extraspec->selftest)
+ ec = extraspec->selftest (algo, extended, report);
+ else
+ {
+ ec = GPG_ERR_CIPHER_ALGO;
+ if (report)
+ report ("cipher", algo, "module",
+ module && !(module->flags & FLAG_MODULE_DISABLED)?
+ "no selftest available" :
+ module? "algorithm disabled" : "algorithm not found");
+ }
+
+ if (module)
+ {
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+ }
+ return gpg_error (ec);
+}
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