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/* Copyright (c) 2004-2007, Sara Golemon <sarag@libssh2.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include "libssh2_priv.h"
#include "mac.h"
#ifdef LIBSSH2_MAC_NONE
/* mac_none_MAC
* Minimalist MAC: No MAC
*/
static int
mac_none_MAC(LIBSSH2_SESSION * session, unsigned char *buf,
uint32_t seqno, const unsigned char *packet,
uint32_t packet_len, const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
return 0;
}
static LIBSSH2_MAC_METHOD mac_method_none = {
"none",
0,
0,
NULL,
mac_none_MAC,
NULL
};
#endif /* LIBSSH2_MAC_NONE */
/* mac_method_common_init
* Initialize simple mac methods
*/
static int
mac_method_common_init(LIBSSH2_SESSION * session, unsigned char *key,
int *free_key, void **abstract)
{
*abstract = key;
*free_key = 0;
(void) session;
return 0;
}
/* mac_method_common_dtor
* Cleanup simple mac methods
*/
static int
mac_method_common_dtor(LIBSSH2_SESSION * session, void **abstract)
{
if(*abstract) {
LIBSSH2_FREE(session, *abstract);
}
*abstract = NULL;
return 0;
}
#if LIBSSH2_HMAC_SHA512
/* mac_method_hmac_sha512_hash
* Calculate hash using full sha512 value
*/
static int
mac_method_hmac_sha2_512_hash(LIBSSH2_SESSION * session,
unsigned char *buf, uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
libssh2_hmac_ctx ctx;
unsigned char seqno_buf[4];
(void) session;
_libssh2_htonu32(seqno_buf, seqno);
libssh2_hmac_ctx_init(ctx);
libssh2_hmac_sha512_init(&ctx, *abstract, 64);
libssh2_hmac_update(ctx, seqno_buf, 4);
libssh2_hmac_update(ctx, packet, packet_len);
if(addtl && addtl_len) {
libssh2_hmac_update(ctx, addtl, addtl_len);
}
libssh2_hmac_final(ctx, buf);
libssh2_hmac_cleanup(&ctx);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_sha2_512 = {
"hmac-sha2-512",
64,
64,
mac_method_common_init,
mac_method_hmac_sha2_512_hash,
mac_method_common_dtor,
};
#endif
#if LIBSSH2_HMAC_SHA256
/* mac_method_hmac_sha256_hash
* Calculate hash using full sha256 value
*/
static int
mac_method_hmac_sha2_256_hash(LIBSSH2_SESSION * session,
unsigned char *buf, uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
libssh2_hmac_ctx ctx;
unsigned char seqno_buf[4];
(void) session;
_libssh2_htonu32(seqno_buf, seqno);
libssh2_hmac_ctx_init(ctx);
libssh2_hmac_sha256_init(&ctx, *abstract, 32);
libssh2_hmac_update(ctx, seqno_buf, 4);
libssh2_hmac_update(ctx, packet, packet_len);
if(addtl && addtl_len) {
libssh2_hmac_update(ctx, addtl, addtl_len);
}
libssh2_hmac_final(ctx, buf);
libssh2_hmac_cleanup(&ctx);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_sha2_256 = {
"hmac-sha2-256",
32,
32,
mac_method_common_init,
mac_method_hmac_sha2_256_hash,
mac_method_common_dtor,
};
#endif
/* mac_method_hmac_sha1_hash
* Calculate hash using full sha1 value
*/
static int
mac_method_hmac_sha1_hash(LIBSSH2_SESSION * session,
unsigned char *buf, uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
libssh2_hmac_ctx ctx;
unsigned char seqno_buf[4];
(void) session;
_libssh2_htonu32(seqno_buf, seqno);
libssh2_hmac_ctx_init(ctx);
libssh2_hmac_sha1_init(&ctx, *abstract, 20);
libssh2_hmac_update(ctx, seqno_buf, 4);
libssh2_hmac_update(ctx, packet, packet_len);
if(addtl && addtl_len) {
libssh2_hmac_update(ctx, addtl, addtl_len);
}
libssh2_hmac_final(ctx, buf);
libssh2_hmac_cleanup(&ctx);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_sha1 = {
"hmac-sha1",
20,
20,
mac_method_common_init,
mac_method_hmac_sha1_hash,
mac_method_common_dtor,
};
/* mac_method_hmac_sha1_96_hash
* Calculate hash using first 96 bits of sha1 value
*/
static int
mac_method_hmac_sha1_96_hash(LIBSSH2_SESSION * session,
unsigned char *buf, uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
unsigned char temp[SHA_DIGEST_LENGTH];
mac_method_hmac_sha1_hash(session, temp, seqno, packet, packet_len,
addtl, addtl_len, abstract);
memcpy(buf, (char *) temp, 96 / 8);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_sha1_96 = {
"hmac-sha1-96",
12,
20,
mac_method_common_init,
mac_method_hmac_sha1_96_hash,
mac_method_common_dtor,
};
#if LIBSSH2_MD5
/* mac_method_hmac_md5_hash
* Calculate hash using full md5 value
*/
static int
mac_method_hmac_md5_hash(LIBSSH2_SESSION * session, unsigned char *buf,
uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
libssh2_hmac_ctx ctx;
unsigned char seqno_buf[4];
(void) session;
_libssh2_htonu32(seqno_buf, seqno);
libssh2_hmac_ctx_init(ctx);
libssh2_hmac_md5_init(&ctx, *abstract, 16);
libssh2_hmac_update(ctx, seqno_buf, 4);
libssh2_hmac_update(ctx, packet, packet_len);
if(addtl && addtl_len) {
libssh2_hmac_update(ctx, addtl, addtl_len);
}
libssh2_hmac_final(ctx, buf);
libssh2_hmac_cleanup(&ctx);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_md5 = {
"hmac-md5",
16,
16,
mac_method_common_init,
mac_method_hmac_md5_hash,
mac_method_common_dtor,
};
/* mac_method_hmac_md5_96_hash
* Calculate hash using first 96 bits of md5 value
*/
static int
mac_method_hmac_md5_96_hash(LIBSSH2_SESSION * session,
unsigned char *buf, uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len, void **abstract)
{
unsigned char temp[MD5_DIGEST_LENGTH];
mac_method_hmac_md5_hash(session, temp, seqno, packet, packet_len,
addtl, addtl_len, abstract);
memcpy(buf, (char *) temp, 96 / 8);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_md5_96 = {
"hmac-md5-96",
12,
16,
mac_method_common_init,
mac_method_hmac_md5_96_hash,
mac_method_common_dtor,
};
#endif /* LIBSSH2_MD5 */
#if LIBSSH2_HMAC_RIPEMD
/* mac_method_hmac_ripemd160_hash
* Calculate hash using ripemd160 value
*/
static int
mac_method_hmac_ripemd160_hash(LIBSSH2_SESSION * session,
unsigned char *buf, uint32_t seqno,
const unsigned char *packet,
uint32_t packet_len,
const unsigned char *addtl,
uint32_t addtl_len,
void **abstract)
{
libssh2_hmac_ctx ctx;
unsigned char seqno_buf[4];
(void) session;
_libssh2_htonu32(seqno_buf, seqno);
libssh2_hmac_ctx_init(ctx);
libssh2_hmac_ripemd160_init(&ctx, *abstract, 20);
libssh2_hmac_update(ctx, seqno_buf, 4);
libssh2_hmac_update(ctx, packet, packet_len);
if(addtl && addtl_len) {
libssh2_hmac_update(ctx, addtl, addtl_len);
}
libssh2_hmac_final(ctx, buf);
libssh2_hmac_cleanup(&ctx);
return 0;
}
static const LIBSSH2_MAC_METHOD mac_method_hmac_ripemd160 = {
"hmac-ripemd160",
20,
20,
mac_method_common_init,
mac_method_hmac_ripemd160_hash,
mac_method_common_dtor,
};
static const LIBSSH2_MAC_METHOD mac_method_hmac_ripemd160_openssh_com = {
"hmac-ripemd160@openssh.com",
20,
20,
mac_method_common_init,
mac_method_hmac_ripemd160_hash,
mac_method_common_dtor,
};
#endif /* LIBSSH2_HMAC_RIPEMD */
static const LIBSSH2_MAC_METHOD *mac_methods[] = {
#if LIBSSH2_HMAC_SHA256
&mac_method_hmac_sha2_256,
#endif
#if LIBSSH2_HMAC_SHA512
&mac_method_hmac_sha2_512,
#endif
&mac_method_hmac_sha1,
&mac_method_hmac_sha1_96,
#if LIBSSH2_MD5
&mac_method_hmac_md5,
&mac_method_hmac_md5_96,
#endif
#if LIBSSH2_HMAC_RIPEMD
&mac_method_hmac_ripemd160,
&mac_method_hmac_ripemd160_openssh_com,
#endif /* LIBSSH2_HMAC_RIPEMD */
#ifdef LIBSSH2_MAC_NONE
&mac_method_none,
#endif /* LIBSSH2_MAC_NONE */
NULL
};
const LIBSSH2_MAC_METHOD **
_libssh2_mac_methods(void)
{
return mac_methods;
}
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