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98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef VANILLA_NACL /* toxcore only uses this when libsodium is unavailable */
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/*-
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* Copyright 2005,2007,2009 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <crypto_hash_sha256.h>
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#include <crypto_auth_hmacsha256.h>
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#include "pbkdf2-sha256.h"
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#include "sysendian.h"
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#include "../../toxcore/crypto_core.h"
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/**
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* PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
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* Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
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* write the output to buf. The value dkLen must be at most 32 * (2^32 - 1).
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*/
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void
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PBKDF2_SHA256(const uint8_t * passwd, size_t passwdlen, const uint8_t * salt,
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size_t saltlen, uint64_t c, uint8_t * buf, size_t dkLen)
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{
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uint8_t key[32] = {0};
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size_t i;
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uint8_t salt_and_ivec[saltlen + 4];
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uint8_t U[32];
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uint8_t T[32];
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uint64_t j;
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int k;
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size_t clen;
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if (passwdlen > 32) {
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/* For some reason libsodium allows 64byte keys meaning keys
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* between 32byte and 64bytes are not compatible with libsodium.
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toxencryptsave should only give 32byte passwds so this isn't an issue here.*/
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crypto_hash_sha256(key, passwd, passwdlen);
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} else {
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memcpy(key, passwd, passwdlen);
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}
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memcpy(salt_and_ivec, salt, saltlen);
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for (i = 0; i * 32 < dkLen; i++) {
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be32enc(salt_and_ivec + saltlen, (uint32_t)(i + 1));
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crypto_auth_hmacsha256(U, salt_and_ivec, sizeof(salt_and_ivec), key);
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memcpy(T, U, 32);
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for (j = 2; j <= c; j++) {
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crypto_auth_hmacsha256(U, U, 32, key);
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for (k = 0; k < 32; k++) {
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T[k] ^= U[k];
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}
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}
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clen = dkLen - i * 32;
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if (clen > 32) {
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clen = 32;
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}
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memcpy(&buf[i * 32], T, clen);
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}
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crypto_memzero((void *) key, sizeof(key));
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}
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#endif
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