diff options
Diffstat (limited to 'libs/libtox/src/toxencryptsave/toxencryptsave.c')
| -rw-r--r-- | libs/libtox/src/toxencryptsave/toxencryptsave.c | 338 |
1 files changed, 0 insertions, 338 deletions
diff --git a/libs/libtox/src/toxencryptsave/toxencryptsave.c b/libs/libtox/src/toxencryptsave/toxencryptsave.c deleted file mode 100644 index 5640e82fc7..0000000000 --- a/libs/libtox/src/toxencryptsave/toxencryptsave.c +++ /dev/null @@ -1,338 +0,0 @@ -/* - * Batch encryption functions. - */ - -/* - * Copyright © 2016-2017 The TokTok team. - * Copyright © 2013 Tox project. - * - * This file is part of Tox, the free peer to peer instant messenger. - * - * Tox is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * Tox 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with Tox. If not, see <http://www.gnu.org/licenses/>. - */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "../toxcore/crypto_core.h" -#include "defines.h" -#include "toxencryptsave.h" -#define SET_ERROR_PARAMETER(param, x) {if(param) {*param = x;}} - -#ifdef VANILLA_NACL -#include <crypto_box.h> -#include <crypto_hash_sha256.h> -#include "crypto_pwhash_scryptsalsa208sha256/crypto_pwhash_scryptsalsa208sha256.h" -#define crypto_box_MACBYTES (crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES) -#else -#include <sodium.h> -#endif - -#include <string.h> - -#if TOX_PASS_SALT_LENGTH != crypto_pwhash_scryptsalsa208sha256_SALTBYTES -#error TOX_PASS_SALT_LENGTH is assumed to be equal to crypto_pwhash_scryptsalsa208sha256_SALTBYTES -#endif - -#if TOX_PASS_KEY_LENGTH != CRYPTO_SHARED_KEY_SIZE -#error TOX_PASS_KEY_LENGTH is assumed to be equal to CRYPTO_SHARED_KEY_SIZE -#endif - -#if TOX_PASS_ENCRYPTION_EXTRA_LENGTH != (crypto_box_MACBYTES + crypto_box_NONCEBYTES + crypto_pwhash_scryptsalsa208sha256_SALTBYTES + TOX_ENC_SAVE_MAGIC_LENGTH) -#error TOX_PASS_ENCRYPTION_EXTRA_LENGTH is assumed to be equal to (crypto_box_MACBYTES + crypto_box_NONCEBYTES + crypto_pwhash_scryptsalsa208sha256_SALTBYTES + TOX_ENC_SAVE_MAGIC_LENGTH) -#endif - -uint32_t tox_pass_salt_length(void) -{ - return TOX_PASS_SALT_LENGTH; -} -uint32_t tox_pass_key_length(void) -{ - return TOX_PASS_KEY_LENGTH; -} -uint32_t tox_pass_encryption_extra_length(void) -{ - return TOX_PASS_ENCRYPTION_EXTRA_LENGTH; -} - -struct Tox_Pass_Key { - uint8_t salt[TOX_PASS_SALT_LENGTH]; - uint8_t key[TOX_PASS_KEY_LENGTH]; -}; - -Tox_Pass_Key *tox_pass_key_new(void) -{ - return (Tox_Pass_Key *)malloc(sizeof(Tox_Pass_Key)); -} - -void tox_pass_key_free(Tox_Pass_Key *pass_key) -{ - free(pass_key); -} - -/* Clients should consider alerting their users that, unlike plain data, if even one bit - * becomes corrupted, the data will be entirely unrecoverable. - * Ditto if they forget their password, there is no way to recover the data. - */ - -/* This retrieves the salt used to encrypt the given data, which can then be passed to - * tox_pass_key_derive_with_salt to produce the same key as was previously used. Any encrpyted - * data with this module can be used as input. - * - * returns true if magic number matches - * success does not say anything about the validity of the data, only that data of - * the appropriate size was copied - */ -bool tox_get_salt(const uint8_t *data, uint8_t *salt, TOX_ERR_GET_SALT *error) -{ - if (!data || !salt) { - SET_ERROR_PARAMETER(error, TOX_ERR_GET_SALT_NULL); - return false; - } - - if (memcmp(data, TOX_ENC_SAVE_MAGIC_NUMBER, TOX_ENC_SAVE_MAGIC_LENGTH) != 0) { - SET_ERROR_PARAMETER(error, TOX_ERR_GET_SALT_BAD_FORMAT); - return false; - } - - data += TOX_ENC_SAVE_MAGIC_LENGTH; - memcpy(salt, data, crypto_pwhash_scryptsalsa208sha256_SALTBYTES); - SET_ERROR_PARAMETER(error, TOX_ERR_GET_SALT_OK); - return true; -} - -/* Generates a secret symmetric key from the given passphrase. out_key must be at least - * TOX_PASS_KEY_LENGTH bytes long. - * Be sure to not compromise the key! Only keep it in memory, do not write to disk. - * The password is zeroed after key derivation. - * The key should only be used with the other functions in this module, as it - * includes a salt. - * Note that this function is not deterministic; to derive the same key from a - * password, you also must know the random salt that was used. See below. - * - * returns true on success - */ -bool tox_pass_key_derive(Tox_Pass_Key *out_key, const uint8_t *passphrase, size_t pplength, - TOX_ERR_KEY_DERIVATION *error) -{ - uint8_t salt[crypto_pwhash_scryptsalsa208sha256_SALTBYTES]; - randombytes(salt, sizeof salt); - return tox_pass_key_derive_with_salt(out_key, passphrase, pplength, salt, error); -} - -/* Same as above, except with use the given salt for deterministic key derivation. - * The salt must be TOX_PASS_SALT_LENGTH bytes in length. - */ -bool tox_pass_key_derive_with_salt(Tox_Pass_Key *out_key, const uint8_t *passphrase, size_t pplength, - const uint8_t *salt, TOX_ERR_KEY_DERIVATION *error) -{ - if (!salt || !out_key || (!passphrase && pplength != 0)) { - SET_ERROR_PARAMETER(error, TOX_ERR_KEY_DERIVATION_NULL); - return 0; - } - - uint8_t passkey[crypto_hash_sha256_BYTES]; - crypto_hash_sha256(passkey, passphrase, pplength); - - uint8_t key[CRYPTO_SHARED_KEY_SIZE]; - - /* Derive a key from the password */ - /* http://doc.libsodium.org/key_derivation/README.html */ - /* note that, according to the documentation, a generic pwhash interface will be created - * once the pwhash competition (https://password-hashing.net/) is over */ - if (crypto_pwhash_scryptsalsa208sha256( - key, sizeof(key), (char *)passkey, sizeof(passkey), salt, - crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE * 2, /* slightly stronger */ - crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE) != 0) { - /* out of memory most likely */ - SET_ERROR_PARAMETER(error, TOX_ERR_KEY_DERIVATION_FAILED); - return 0; - } - - sodium_memzero(passkey, crypto_hash_sha256_BYTES); /* wipe plaintext pw */ - memcpy(out_key->salt, salt, crypto_pwhash_scryptsalsa208sha256_SALTBYTES); - memcpy(out_key->key, key, CRYPTO_SHARED_KEY_SIZE); - SET_ERROR_PARAMETER(error, TOX_ERR_KEY_DERIVATION_OK); - return 1; -} - -/* Encrypt arbitrary with a key produced by tox_derive_key_*. The output - * array must be at least data_len + TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes long. - * key must be TOX_PASS_KEY_LENGTH bytes. - * If you already have a symmetric key from somewhere besides this module, simply - * call encrypt_data_symmetric in toxcore/crypto_core directly. - * - * returns true on success - */ -bool tox_pass_key_encrypt(const Tox_Pass_Key *key, const uint8_t *data, size_t data_len, uint8_t *out, - TOX_ERR_ENCRYPTION *error) -{ - if (data_len == 0 || !data || !key || !out) { - SET_ERROR_PARAMETER(error, TOX_ERR_ENCRYPTION_NULL); - return 0; - } - - /* the output data consists of, in order: - * salt, nonce, mac, enc_data - * where the mac is automatically prepended by the encrypt() - * the salt+nonce is called the prefix - * I'm not sure what else I'm supposed to do with the salt and nonce, since we - * need them to decrypt the data - */ - - /* first add the magic number */ - memcpy(out, TOX_ENC_SAVE_MAGIC_NUMBER, TOX_ENC_SAVE_MAGIC_LENGTH); - out += TOX_ENC_SAVE_MAGIC_LENGTH; - - /* then add the rest prefix */ - memcpy(out, key->salt, crypto_pwhash_scryptsalsa208sha256_SALTBYTES); - out += crypto_pwhash_scryptsalsa208sha256_SALTBYTES; - - uint8_t nonce[crypto_box_NONCEBYTES]; - random_nonce(nonce); - memcpy(out, nonce, crypto_box_NONCEBYTES); - out += crypto_box_NONCEBYTES; - - /* now encrypt */ - if (encrypt_data_symmetric(key->key, nonce, data, data_len, out) - != data_len + crypto_box_MACBYTES) { - SET_ERROR_PARAMETER(error, TOX_ERR_ENCRYPTION_FAILED); - return 0; - } - - SET_ERROR_PARAMETER(error, TOX_ERR_ENCRYPTION_OK); - return 1; -} - -/* Encrypts the given data with the given passphrase. The output array must be - * at least data_len + TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes long. This delegates - * to tox_derive_key and tox_pass_key_encrypt. - * - * returns true on success - */ -bool tox_pass_encrypt(const uint8_t *data, size_t data_len, const uint8_t *passphrase, size_t pplength, uint8_t *out, - TOX_ERR_ENCRYPTION *error) -{ - Tox_Pass_Key key; - TOX_ERR_KEY_DERIVATION _error; - - if (!tox_pass_key_derive(&key, passphrase, pplength, &_error)) { - if (_error == TOX_ERR_KEY_DERIVATION_NULL) { - SET_ERROR_PARAMETER(error, TOX_ERR_ENCRYPTION_NULL); - } else if (_error == TOX_ERR_KEY_DERIVATION_FAILED) { - SET_ERROR_PARAMETER(error, TOX_ERR_ENCRYPTION_KEY_DERIVATION_FAILED); - } - - return 0; - } - - return tox_pass_key_encrypt(&key, data, data_len, out, error); -} - -/* This is the inverse of tox_pass_key_encrypt, also using only keys produced by - * tox_derive_key. - * - * the output data has size data_length - TOX_PASS_ENCRYPTION_EXTRA_LENGTH - * - * returns true on success - */ -bool tox_pass_key_decrypt(const Tox_Pass_Key *key, const uint8_t *data, size_t length, uint8_t *out, - TOX_ERR_DECRYPTION *error) -{ - if (length <= TOX_PASS_ENCRYPTION_EXTRA_LENGTH) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_INVALID_LENGTH); - return 0; - } - - if (!data || !key || !out) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_NULL); - return 0; - } - - if (memcmp(data, TOX_ENC_SAVE_MAGIC_NUMBER, TOX_ENC_SAVE_MAGIC_LENGTH) != 0) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_BAD_FORMAT); - return 0; - } - - data += TOX_ENC_SAVE_MAGIC_LENGTH; - data += crypto_pwhash_scryptsalsa208sha256_SALTBYTES; // salt only affects key derivation - - size_t decrypt_length = length - TOX_PASS_ENCRYPTION_EXTRA_LENGTH; - - uint8_t nonce[crypto_box_NONCEBYTES]; - memcpy(nonce, data, crypto_box_NONCEBYTES); - data += crypto_box_NONCEBYTES; - - /* decrypt the data */ - if (decrypt_data_symmetric(key->key, nonce, data, decrypt_length + crypto_box_MACBYTES, out) - != decrypt_length) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_FAILED); - return 0; - } - - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_OK); - return 1; -} - -/* Decrypts the given data with the given passphrase. The output array must be - * at least data_len - TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes long. This delegates - * to tox_pass_key_decrypt. - * - * the output data has size data_length - TOX_PASS_ENCRYPTION_EXTRA_LENGTH - * - * returns true on success - */ -bool tox_pass_decrypt(const uint8_t *data, size_t length, const uint8_t *passphrase, size_t pplength, uint8_t *out, - TOX_ERR_DECRYPTION *error) -{ - if (length <= TOX_PASS_ENCRYPTION_EXTRA_LENGTH) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_INVALID_LENGTH); - return 0; - } - - if (!data || !passphrase || !out) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_NULL); - return 0; - } - - if (memcmp(data, TOX_ENC_SAVE_MAGIC_NUMBER, TOX_ENC_SAVE_MAGIC_LENGTH) != 0) { - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_BAD_FORMAT); - return 0; - } - - uint8_t salt[crypto_pwhash_scryptsalsa208sha256_SALTBYTES]; - memcpy(salt, data + TOX_ENC_SAVE_MAGIC_LENGTH, crypto_pwhash_scryptsalsa208sha256_SALTBYTES); - - /* derive the key */ - Tox_Pass_Key key; - - if (!tox_pass_key_derive_with_salt(&key, passphrase, pplength, salt, NULL)) { - /* out of memory most likely */ - SET_ERROR_PARAMETER(error, TOX_ERR_DECRYPTION_KEY_DERIVATION_FAILED); - return 0; - } - - return tox_pass_key_decrypt(&key, data, length, out, error); -} - -/* Determines whether or not the given data is encrypted (by checking the magic number) - */ -bool tox_is_data_encrypted(const uint8_t *data) -{ - if (memcmp(data, TOX_ENC_SAVE_MAGIC_NUMBER, TOX_ENC_SAVE_MAGIC_LENGTH) == 0) { - return 1; - } - - return 0; -} |