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add hmac-sha256/512

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This commit is contained in:
Pavol Rusnak 2013-09-10 21:47:06 +02:00
parent 40fa3f52e4
commit 047b30cf2f
3 changed files with 72 additions and 1 deletions
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2
Makefile
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@ -1,6 +1,6 @@
CC = gcc
CFLAGS = -Wall -Os
OBJS = aux.o ecdsa.o secp256k1.o sha2.o rand.o
OBJS = aux.o ecdsa.o secp256k1.o sha2.o rand.o hmac.o
all: test-speed test-verify

62
hmac.c Normal file
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@ -0,0 +1,62 @@
#include <string.h>
#include "hmac.h"
#include "sha2.h"
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;
memset(buf, 0, SHA256_BLOCK_LENGTH);
if (keylen > SHA256_BLOCK_LENGTH) {
SHA256_Raw(key, keylen, buf);
} else {
memcpy(buf, key, keylen);
}
for (i = 0; i < SHA256_BLOCK_LENGTH; i++) {
o_key_pad[i] = buf[i] ^ 0x5c;
i_key_pad[i] = buf[i] ^ 0x36;
}
SHA256_Init(&ctx);
SHA256_Update(&ctx, i_key_pad, SHA256_BLOCK_LENGTH);
SHA256_Update(&ctx, msg, msglen);
SHA256_Final(buf, &ctx);
SHA256_Init(&ctx);
SHA256_Update(&ctx, o_key_pad, SHA256_BLOCK_LENGTH);
SHA256_Update(&ctx, buf, SHA256_DIGEST_LENGTH);
SHA256_Final(hmac, &ctx);
}
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(buf, &ctx);
SHA512_Init(&ctx);
SHA512_Update(&ctx, o_key_pad, SHA512_BLOCK_LENGTH);
SHA512_Update(&ctx, buf, SHA512_DIGEST_LENGTH);
SHA512_Final(hmac, &ctx);
}

9
hmac.h Normal file
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#ifndef __HMAC_H__
#define __HMAC_H__
#include <stdint.h>
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(const uint8_t *key, const uint32_t keylen, const uint8_t *msg, const uint32_t msglen, uint8_t *hmac);
#endif