mirror of
https://github.com/trezor/trezor-firmware.git
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62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/**
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* Copyright (c) 2013-2014 Tomas Dzetkulic
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* Copyright (c) 2013-2014 Pavol Rusnak
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include "pbkdf2.h"
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#include "hmac.h"
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#define HMACFUNC hmac_sha512
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#define HMACLEN (512/8)
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void pbkdf2(const uint8_t *pass, int passlen, uint8_t *salt, int saltlen, uint32_t iterations, uint8_t *key, int keylen, void (*progress_callback)(uint32_t current, uint32_t total))
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{
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uint32_t i, j, k;
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uint8_t f[HMACLEN], g[HMACLEN];
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uint32_t blocks = keylen / HMACLEN;
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if (keylen & (HMACLEN - 1)) {
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blocks++;
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}
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for (i = 1; i <= blocks; i++) {
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salt[saltlen ] = (i >> 24) & 0xFF;
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salt[saltlen + 1] = (i >> 16) & 0xFF;
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salt[saltlen + 2] = (i >> 8) & 0xFF;
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salt[saltlen + 3] = i & 0xFF;
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HMACFUNC(pass, passlen, salt, saltlen + 4, g);
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memcpy(f, g, HMACLEN);
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for (j = 1; j < iterations; j++) {
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HMACFUNC(pass, passlen, g, HMACLEN, g);
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for (k = 0; k < HMACLEN; k++) {
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f[k] ^= g[k];
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}
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if (progress_callback && j % 256 == 255) {
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progress_callback(j + 1, iterations);
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}
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}
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if (i == blocks - 1 && (keylen & (HMACLEN - 1))) {
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memcpy(key + HMACLEN * (i - 1), f, keylen & (HMACLEN - 1));
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} else {
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memcpy(key + HMACLEN * (i - 1), f, HMACLEN);
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}
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}
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}
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