91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
/*-
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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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/*
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* Adapted from libsodium/crypto_pwhash/scryptsalsa208sha256/pbkdf-sha256.c
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*/
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#include <string.h>
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#include <sodium.h>
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#include "pbkdf2.h"
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/**
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* pbkdf2_sha512(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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int
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sn__extension_pbkdf2_sha512(const unsigned char *passwd, size_t passwdlen,
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const unsigned char *salt, size_t saltlen, uint64_t c,
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unsigned char *buf, size_t dkLen)
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{
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crypto_auth_hmacsha512_state PShctx, hctx;
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size_t i;
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unsigned char ivec[4];
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unsigned char U[64];
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unsigned char T[64];
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uint64_t j;
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unsigned int k;
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size_t clen;
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if (dkLen > sn__extension_pbkdf2_sha512_BYTES_MAX) {
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return -1;
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}
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crypto_auth_hmacsha512_init(&PShctx, passwd, passwdlen);
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crypto_auth_hmacsha512_update(&PShctx, salt, saltlen);
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for (i = 0; i * crypto_auth_hmacsha512_BYTES < dkLen; i++) {
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SN_PBKDF2_STORE32_BE(ivec, (uint32_t)(i + 1));
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memcpy(&hctx, &PShctx, sizeof(crypto_auth_hmacsha512_state));
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crypto_auth_hmacsha512_update(&hctx, ivec, 4);
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crypto_auth_hmacsha512_final(&hctx, U);
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memcpy(T, U, crypto_auth_hmacsha512_BYTES);
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/* LCOV_EXCL_START */
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for (j = 2; j <= c; j++) {
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crypto_auth_hmacsha512_init(&hctx, passwd, passwdlen);
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crypto_auth_hmacsha512_update(&hctx, U, crypto_auth_hmacsha512_BYTES);
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crypto_auth_hmacsha512_final(&hctx, U);
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for (k = 0; k < crypto_auth_hmacsha512_BYTES; k++) {
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T[k] ^= U[k];
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}
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}
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/* LCOV_EXCL_STOP */
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clen = dkLen - i * crypto_auth_hmacsha512_BYTES;
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if (clen > crypto_auth_hmacsha512_BYTES) {
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clen = crypto_auth_hmacsha512_BYTES;
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}
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memcpy(&buf[i * crypto_auth_hmacsha512_BYTES], T, clen);
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}
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sodium_memzero((void *) &PShctx, sizeof PShctx);
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return 0;
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}
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