mirror of
https://github.com/trezor/trezor-firmware.git
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94 lines
3.0 KiB
C
94 lines
3.0 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 "hmac.h"
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#include "sha2.h"
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#include "macros.h"
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void hmac_sha256(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac)
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{
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int i;
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uint8_t buf[SHA256_BLOCK_LENGTH], o_key_pad[SHA256_BLOCK_LENGTH], i_key_pad[SHA256_BLOCK_LENGTH];
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SHA256_CTX ctx;
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memset(buf, 0, SHA256_BLOCK_LENGTH);
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if (keylen > SHA256_BLOCK_LENGTH) {
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sha256_Raw(key, keylen, buf);
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} else {
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memcpy(buf, key, keylen);
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}
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for (i = 0; i < SHA256_BLOCK_LENGTH; i++) {
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o_key_pad[i] = buf[i] ^ 0x5c;
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i_key_pad[i] = buf[i] ^ 0x36;
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}
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sha256_Init(&ctx);
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sha256_Update(&ctx, i_key_pad, SHA256_BLOCK_LENGTH);
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sha256_Update(&ctx, msg, msglen);
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sha256_Final(buf, &ctx);
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sha256_Init(&ctx);
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sha256_Update(&ctx, o_key_pad, SHA256_BLOCK_LENGTH);
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sha256_Update(&ctx, buf, SHA256_DIGEST_LENGTH);
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sha256_Final(hmac, &ctx);
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MEMSET_BZERO(buf, sizeof(buf));
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MEMSET_BZERO(o_key_pad, sizeof(o_key_pad));
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MEMSET_BZERO(i_key_pad, sizeof(i_key_pad));
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}
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void hmac_sha512(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac)
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{
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int i;
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uint8_t buf[SHA512_BLOCK_LENGTH], o_key_pad[SHA512_BLOCK_LENGTH], i_key_pad[SHA512_BLOCK_LENGTH];
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SHA512_CTX ctx;
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memset(buf, 0, SHA512_BLOCK_LENGTH);
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if (keylen > SHA512_BLOCK_LENGTH) {
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sha512_Raw(key, keylen, buf);
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} else {
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memcpy(buf, key, keylen);
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}
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for (i = 0; i < SHA512_BLOCK_LENGTH; i++) {
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o_key_pad[i] = buf[i] ^ 0x5c;
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i_key_pad[i] = buf[i] ^ 0x36;
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}
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sha512_Init(&ctx);
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sha512_Update(&ctx, i_key_pad, SHA512_BLOCK_LENGTH);
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sha512_Update(&ctx, msg, msglen);
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sha512_Final(buf, &ctx);
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sha512_Init(&ctx);
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sha512_Update(&ctx, o_key_pad, SHA512_BLOCK_LENGTH);
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sha512_Update(&ctx, buf, SHA512_DIGEST_LENGTH);
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sha512_Final(hmac, &ctx);
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MEMSET_BZERO(buf, sizeof(buf));
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MEMSET_BZERO(o_key_pad, sizeof(o_key_pad));
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MEMSET_BZERO(i_key_pad, sizeof(i_key_pad));
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}
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