/** * Copyright (c) 2013-2014 Tomas Dzetkulic * Copyright (c) 2013-2014 Pavol Rusnak * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include <string.h> #include "hmac.h" #include "memzero.h" #include "options.h" void hmac_sha256_Init(HMAC_SHA256_CTX *hctx, const uint8_t *key, const uint32_t keylen) { static CONFIDENTIAL uint8_t i_key_pad[SHA256_BLOCK_LENGTH]; memzero(i_key_pad, SHA256_BLOCK_LENGTH); if (keylen > SHA256_BLOCK_LENGTH) { sha256_Raw(key, keylen, i_key_pad); } else { memcpy(i_key_pad, key, keylen); } for (int i = 0; i < SHA256_BLOCK_LENGTH; i++) { hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c; i_key_pad[i] ^= 0x36; } sha256_Init(&(hctx->ctx)); sha256_Update(&(hctx->ctx), i_key_pad, SHA256_BLOCK_LENGTH); memzero(i_key_pad, sizeof(i_key_pad)); } void hmac_sha256_Update(HMAC_SHA256_CTX *hctx, const uint8_t *msg, const uint32_t msglen) { sha256_Update(&(hctx->ctx), msg, msglen); } void hmac_sha256_Final(HMAC_SHA256_CTX *hctx, uint8_t *hmac) { sha256_Final(&(hctx->ctx), hmac); sha256_Init(&(hctx->ctx)); sha256_Update(&(hctx->ctx), hctx->o_key_pad, SHA256_BLOCK_LENGTH); sha256_Update(&(hctx->ctx), hmac, SHA256_DIGEST_LENGTH); sha256_Final(&(hctx->ctx), hmac); memzero(hctx, sizeof(HMAC_SHA256_CTX)); } void hmac_sha256(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac) { static CONFIDENTIAL HMAC_SHA256_CTX hctx; hmac_sha256_Init(&hctx, key, keylen); hmac_sha256_Update(&hctx, msg, msglen); hmac_sha256_Final(&hctx, hmac); } void hmac_sha256_prepare(const uint8_t *key, const uint32_t keylen, uint32_t *opad_digest, uint32_t *ipad_digest) { static CONFIDENTIAL uint32_t key_pad[SHA256_BLOCK_LENGTH / sizeof(uint32_t)]; memzero(key_pad, sizeof(key_pad)); if (keylen > SHA256_BLOCK_LENGTH) { static CONFIDENTIAL SHA256_CTX context; sha256_Init(&context); sha256_Update(&context, key, keylen); sha256_Final(&context, (uint8_t *)key_pad); } else { memcpy(key_pad, key, keylen); } /* compute o_key_pad and its digest */ for (int i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) { uint32_t data = 0; #if BYTE_ORDER == LITTLE_ENDIAN REVERSE32(key_pad[i], data); #else data = key_pad[i]; #endif key_pad[i] = data ^ 0x5c5c5c5c; } sha256_Transform(sha256_initial_hash_value, key_pad, opad_digest); /* convert o_key_pad to i_key_pad and compute its digest */ for (int i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) { key_pad[i] = key_pad[i] ^ 0x5c5c5c5c ^ 0x36363636; } sha256_Transform(sha256_initial_hash_value, key_pad, ipad_digest); memzero(key_pad, sizeof(key_pad)); } void hmac_sha512_Init(HMAC_SHA512_CTX *hctx, const uint8_t *key, const uint32_t keylen) { static CONFIDENTIAL uint8_t i_key_pad[SHA512_BLOCK_LENGTH]; memzero(i_key_pad, SHA512_BLOCK_LENGTH); if (keylen > SHA512_BLOCK_LENGTH) { sha512_Raw(key, keylen, i_key_pad); } else { memcpy(i_key_pad, key, keylen); } for (int i = 0; i < SHA512_BLOCK_LENGTH; i++) { hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c; i_key_pad[i] ^= 0x36; } sha512_Init(&(hctx->ctx)); sha512_Update(&(hctx->ctx), i_key_pad, SHA512_BLOCK_LENGTH); memzero(i_key_pad, sizeof(i_key_pad)); } void hmac_sha512_Update(HMAC_SHA512_CTX *hctx, const uint8_t *msg, const uint32_t msglen) { sha512_Update(&(hctx->ctx), msg, msglen); } void hmac_sha512_Final(HMAC_SHA512_CTX *hctx, uint8_t *hmac) { sha512_Final(&(hctx->ctx), hmac); sha512_Init(&(hctx->ctx)); sha512_Update(&(hctx->ctx), hctx->o_key_pad, SHA512_BLOCK_LENGTH); sha512_Update(&(hctx->ctx), hmac, SHA512_DIGEST_LENGTH); sha512_Final(&(hctx->ctx), hmac); memzero(hctx, sizeof(HMAC_SHA512_CTX)); } void hmac_sha512(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac) { HMAC_SHA512_CTX hctx = {0}; hmac_sha512_Init(&hctx, key, keylen); hmac_sha512_Update(&hctx, msg, msglen); hmac_sha512_Final(&hctx, hmac); } void hmac_sha512_prepare(const uint8_t *key, const uint32_t keylen, uint64_t *opad_digest, uint64_t *ipad_digest) { static CONFIDENTIAL uint64_t key_pad[SHA512_BLOCK_LENGTH / sizeof(uint64_t)]; memzero(key_pad, sizeof(key_pad)); if (keylen > SHA512_BLOCK_LENGTH) { static CONFIDENTIAL SHA512_CTX context; sha512_Init(&context); sha512_Update(&context, key, keylen); sha512_Final(&context, (uint8_t *)key_pad); } else { memcpy(key_pad, key, keylen); } /* compute o_key_pad and its digest */ for (int i = 0; i < SHA512_BLOCK_LENGTH / (int)sizeof(uint64_t); i++) { uint64_t data = 0; #if BYTE_ORDER == LITTLE_ENDIAN REVERSE64(key_pad[i], data); #else data = key_pad[i]; #endif key_pad[i] = data ^ 0x5c5c5c5c5c5c5c5c; } sha512_Transform(sha512_initial_hash_value, key_pad, opad_digest); /* convert o_key_pad to i_key_pad and compute its digest */ for (int i = 0; i < SHA512_BLOCK_LENGTH / (int)sizeof(uint64_t); i++) { key_pad[i] = key_pad[i] ^ 0x5c5c5c5c5c5c5c5c ^ 0x3636363636363636; } sha512_Transform(sha512_initial_hash_value, key_pad, ipad_digest); memzero(key_pad, sizeof(key_pad)); }