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177 lines
6.2 KiB
177 lines
6.2 KiB
/**
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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 "memzero.h"
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#include "options.h"
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void hmac_sha256_Init(HMAC_SHA256_CTX *hctx, const uint8_t *key,
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const uint32_t keylen) {
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static CONFIDENTIAL uint8_t i_key_pad[SHA256_BLOCK_LENGTH];
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memzero(i_key_pad, SHA256_BLOCK_LENGTH);
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if (keylen > SHA256_BLOCK_LENGTH) {
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sha256_Raw(key, keylen, i_key_pad);
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} else {
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memcpy(i_key_pad, key, keylen);
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}
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for (int i = 0; i < SHA256_BLOCK_LENGTH; i++) {
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hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
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i_key_pad[i] ^= 0x36;
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}
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sha256_Init(&(hctx->ctx));
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sha256_Update(&(hctx->ctx), i_key_pad, SHA256_BLOCK_LENGTH);
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memzero(i_key_pad, sizeof(i_key_pad));
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}
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void hmac_sha256_Update(HMAC_SHA256_CTX *hctx, const uint8_t *msg,
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const uint32_t msglen) {
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sha256_Update(&(hctx->ctx), msg, msglen);
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}
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void hmac_sha256_Final(HMAC_SHA256_CTX *hctx, uint8_t *hmac) {
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sha256_Final(&(hctx->ctx), hmac);
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sha256_Init(&(hctx->ctx));
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sha256_Update(&(hctx->ctx), hctx->o_key_pad, SHA256_BLOCK_LENGTH);
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sha256_Update(&(hctx->ctx), hmac, SHA256_DIGEST_LENGTH);
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sha256_Final(&(hctx->ctx), hmac);
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memzero(hctx, sizeof(HMAC_SHA256_CTX));
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}
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void hmac_sha256(const uint8_t *key, const uint32_t keylen, const uint8_t *msg,
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const uint32_t msglen, uint8_t *hmac) {
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static CONFIDENTIAL HMAC_SHA256_CTX hctx;
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hmac_sha256_Init(&hctx, key, keylen);
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hmac_sha256_Update(&hctx, msg, msglen);
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hmac_sha256_Final(&hctx, hmac);
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}
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void hmac_sha256_prepare(const uint8_t *key, const uint32_t keylen,
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uint32_t *opad_digest, uint32_t *ipad_digest) {
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static CONFIDENTIAL uint32_t key_pad[SHA256_BLOCK_LENGTH / sizeof(uint32_t)];
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memzero(key_pad, sizeof(key_pad));
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if (keylen > SHA256_BLOCK_LENGTH) {
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static CONFIDENTIAL SHA256_CTX context;
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sha256_Init(&context);
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sha256_Update(&context, key, keylen);
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sha256_Final(&context, (uint8_t *)key_pad);
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} else {
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memcpy(key_pad, key, keylen);
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}
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/* compute o_key_pad and its digest */
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for (int i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) {
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uint32_t data = 0;
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#if BYTE_ORDER == LITTLE_ENDIAN
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REVERSE32(key_pad[i], data);
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#else
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data = key_pad[i];
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#endif
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key_pad[i] = data ^ 0x5c5c5c5c;
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}
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sha256_Transform(sha256_initial_hash_value, key_pad, opad_digest);
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/* convert o_key_pad to i_key_pad and compute its digest */
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for (int i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) {
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key_pad[i] = key_pad[i] ^ 0x5c5c5c5c ^ 0x36363636;
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}
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sha256_Transform(sha256_initial_hash_value, key_pad, ipad_digest);
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memzero(key_pad, sizeof(key_pad));
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}
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void hmac_sha512_Init(HMAC_SHA512_CTX *hctx, const uint8_t *key,
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const uint32_t keylen) {
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static CONFIDENTIAL uint8_t i_key_pad[SHA512_BLOCK_LENGTH];
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memzero(i_key_pad, SHA512_BLOCK_LENGTH);
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if (keylen > SHA512_BLOCK_LENGTH) {
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sha512_Raw(key, keylen, i_key_pad);
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} else {
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memcpy(i_key_pad, key, keylen);
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}
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for (int i = 0; i < SHA512_BLOCK_LENGTH; i++) {
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hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
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i_key_pad[i] ^= 0x36;
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}
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sha512_Init(&(hctx->ctx));
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sha512_Update(&(hctx->ctx), i_key_pad, SHA512_BLOCK_LENGTH);
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memzero(i_key_pad, sizeof(i_key_pad));
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}
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void hmac_sha512_Update(HMAC_SHA512_CTX *hctx, const uint8_t *msg,
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const uint32_t msglen) {
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sha512_Update(&(hctx->ctx), msg, msglen);
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}
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void hmac_sha512_Final(HMAC_SHA512_CTX *hctx, uint8_t *hmac) {
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sha512_Final(&(hctx->ctx), hmac);
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sha512_Init(&(hctx->ctx));
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sha512_Update(&(hctx->ctx), hctx->o_key_pad, SHA512_BLOCK_LENGTH);
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sha512_Update(&(hctx->ctx), hmac, SHA512_DIGEST_LENGTH);
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sha512_Final(&(hctx->ctx), hmac);
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memzero(hctx, sizeof(HMAC_SHA512_CTX));
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}
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void hmac_sha512(const uint8_t *key, const uint32_t keylen, const uint8_t *msg,
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const uint32_t msglen, uint8_t *hmac) {
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HMAC_SHA512_CTX hctx = {0};
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hmac_sha512_Init(&hctx, key, keylen);
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hmac_sha512_Update(&hctx, msg, msglen);
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hmac_sha512_Final(&hctx, hmac);
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}
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void hmac_sha512_prepare(const uint8_t *key, const uint32_t keylen,
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uint64_t *opad_digest, uint64_t *ipad_digest) {
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static CONFIDENTIAL uint64_t key_pad[SHA512_BLOCK_LENGTH / sizeof(uint64_t)];
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memzero(key_pad, sizeof(key_pad));
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if (keylen > SHA512_BLOCK_LENGTH) {
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static CONFIDENTIAL SHA512_CTX context;
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sha512_Init(&context);
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sha512_Update(&context, key, keylen);
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sha512_Final(&context, (uint8_t *)key_pad);
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} else {
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memcpy(key_pad, key, keylen);
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}
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/* compute o_key_pad and its digest */
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for (int i = 0; i < SHA512_BLOCK_LENGTH / (int)sizeof(uint64_t); i++) {
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uint64_t data = 0;
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#if BYTE_ORDER == LITTLE_ENDIAN
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REVERSE64(key_pad[i], data);
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#else
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data = key_pad[i];
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#endif
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key_pad[i] = data ^ 0x5c5c5c5c5c5c5c5c;
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}
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sha512_Transform(sha512_initial_hash_value, key_pad, opad_digest);
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/* convert o_key_pad to i_key_pad and compute its digest */
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for (int i = 0; i < SHA512_BLOCK_LENGTH / (int)sizeof(uint64_t); i++) {
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key_pad[i] = key_pad[i] ^ 0x5c5c5c5c5c5c5c5c ^ 0x3636363636363636;
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}
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sha512_Transform(sha512_initial_hash_value, key_pad, ipad_digest);
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memzero(key_pad, sizeof(key_pad));
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}
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