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Code Issues Releases Wiki Activity

split hmac into init/update/final

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This commit is contained in:
Pavol Rusnak 2016-04-26 17:10:24 +02:00
parent ed6debf8c4
commit 445e859450
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GPG Key ID: 91F3B339B9A02A3D
2 changed files with 92 additions and 54 deletions
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126
hmac.c
View File

@ -24,70 +24,90 @@
#include <string.h>
#include "hmac.h"
#include "sha2.h"
#include "macros.h"
void hmac_sha256_Init(HMAC_SHA256_CTX *hctx, const uint8_t *key, const uint32_t keylen)
{
uint8_t i_key_pad[SHA256_BLOCK_LENGTH];
memset(i_key_pad, 0, 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);
MEMSET_BZERO(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)
{
uint8_t hash[SHA256_DIGEST_LENGTH];
sha256_Final(&(hctx->ctx), hash);
sha256_Init(&(hctx->ctx));
sha256_Update(&(hctx->ctx), hctx->o_key_pad, SHA256_BLOCK_LENGTH);
sha256_Update(&(hctx->ctx), hash, SHA256_DIGEST_LENGTH);
sha256_Final(&(hctx->ctx), hmac);
MEMSET_BZERO(hash, sizeof(hash));
MEMSET_BZERO(hctx, sizeof(hctx));
}
void hmac_sha256(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac)
{
int i;
uint8_t buf[SHA256_BLOCK_LENGTH], o_key_pad[SHA256_BLOCK_LENGTH], i_key_pad[SHA256_BLOCK_LENGTH];
SHA256_CTX ctx;
HMAC_SHA256_CTX hctx;
hmac_sha256_Init(&hctx, key, keylen);
hmac_sha256_Update(&hctx, msg, msglen);
hmac_sha256_Final(&hctx, hmac);
}
memset(buf, 0, SHA256_BLOCK_LENGTH);
if (keylen > SHA256_BLOCK_LENGTH) {
sha256_Raw(key, keylen, buf);
void hmac_sha512_Init(HMAC_SHA512_CTX *hctx, const uint8_t *key, const uint32_t keylen)
{
uint8_t i_key_pad[SHA512_BLOCK_LENGTH];
memset(i_key_pad, 0, SHA512_BLOCK_LENGTH);
if (keylen > SHA512_BLOCK_LENGTH) {
sha512_Raw(key, keylen, i_key_pad);
} else {
memcpy(buf, key, keylen);
memcpy(i_key_pad, key, keylen);
}
for (i = 0; i < SHA256_BLOCK_LENGTH; i++) {
o_key_pad[i] = buf[i] ^ 0x5c;
i_key_pad[i] = buf[i] ^ 0x36;
for (int i = 0; i < SHA512_BLOCK_LENGTH; i++) {
hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
i_key_pad[i] ^= 0x36;
}
sha256_Init(&ctx);
sha256_Update(&ctx, i_key_pad, SHA256_BLOCK_LENGTH);
sha256_Update(&ctx, msg, msglen);
sha256_Final(&ctx, buf);
sha256_Init(&ctx);
sha256_Update(&ctx, o_key_pad, SHA256_BLOCK_LENGTH);
sha256_Update(&ctx, buf, SHA256_DIGEST_LENGTH);
sha256_Final(&ctx, hmac);
MEMSET_BZERO(buf, sizeof(buf));
MEMSET_BZERO(o_key_pad, sizeof(o_key_pad));
sha512_Init(&(hctx->ctx));
sha512_Update(&(hctx->ctx), i_key_pad, SHA512_BLOCK_LENGTH);
MEMSET_BZERO(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)
{
uint8_t hash[SHA512_DIGEST_LENGTH];
sha512_Final(&(hctx->ctx), hash);
sha512_Init(&(hctx->ctx));
sha512_Update(&(hctx->ctx), hctx->o_key_pad, SHA512_BLOCK_LENGTH);
sha512_Update(&(hctx->ctx), hash, SHA512_DIGEST_LENGTH);
sha512_Final(&(hctx->ctx), hmac);
MEMSET_BZERO(hash, sizeof(hash));
MEMSET_BZERO(hctx, sizeof(hctx));
}
void hmac_sha512(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac)
{
int i;
uint8_t buf[SHA512_BLOCK_LENGTH], o_key_pad[SHA512_BLOCK_LENGTH], i_key_pad[SHA512_BLOCK_LENGTH];
SHA512_CTX ctx;
memset(buf, 0, SHA512_BLOCK_LENGTH);
if (keylen > SHA512_BLOCK_LENGTH) {
sha512_Raw(key, keylen, buf);
} else {
memcpy(buf, key, keylen);
}
for (i = 0; i < SHA512_BLOCK_LENGTH; i++) {
o_key_pad[i] = buf[i] ^ 0x5c;
i_key_pad[i] = buf[i] ^ 0x36;
}
sha512_Init(&ctx);
sha512_Update(&ctx, i_key_pad, SHA512_BLOCK_LENGTH);
sha512_Update(&ctx, msg, msglen);
sha512_Final(&ctx, buf);
sha512_Init(&ctx);
sha512_Update(&ctx, o_key_pad, SHA512_BLOCK_LENGTH);
sha512_Update(&ctx, buf, SHA512_DIGEST_LENGTH);
sha512_Final(&ctx, hmac);
MEMSET_BZERO(buf, sizeof(buf));
MEMSET_BZERO(o_key_pad, sizeof(o_key_pad));
MEMSET_BZERO(i_key_pad, sizeof(i_key_pad));
HMAC_SHA512_CTX hctx;
hmac_sha512_Init(&hctx, key, keylen);
hmac_sha512_Update(&hctx, msg, msglen);
hmac_sha512_Final(&hctx, hmac);
}

20
hmac.h
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@ -14,7 +14,7 @@
*
* 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
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT HMAC_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
@ -25,8 +25,26 @@
#define __HMAC_H__
#include <stdint.h>
#include "sha2.h"
typedef struct _HMAC_SHA256_CTX {
uint8_t o_key_pad[SHA256_BLOCK_LENGTH];
SHA256_CTX ctx;
} HMAC_SHA256_CTX;
typedef struct _HMAC_SHA512_CTX {
uint8_t o_key_pad[SHA512_BLOCK_LENGTH];
SHA512_CTX ctx;
} HMAC_SHA512_CTX;
void hmac_sha256_Init(HMAC_SHA256_CTX *hctx, const uint8_t *key, const uint32_t keylen);
void hmac_sha256_Update(HMAC_SHA256_CTX *hctx, const uint8_t *msg, const uint32_t msglen);
void hmac_sha256_Final(HMAC_SHA256_CTX *hctx, uint8_t *hmac);
void hmac_sha256(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac);
void hmac_sha512_Init(HMAC_SHA512_CTX *hctx, const uint8_t *key, const uint32_t keylen);
void hmac_sha512_Update(HMAC_SHA512_CTX *hctx, const uint8_t *msg, const uint32_t msglen);
void hmac_sha512_Final(HMAC_SHA512_CTX *hctx, uint8_t *hmac);
void hmac_sha512(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac);
#endif