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mirror of https://github.com/trezor/trezor-firmware.git synced 2024-12-22 22:38:08 +00:00
trezor-firmware/hmac.c
2013-09-10 21:47:06 +02:00

63 lines
1.6 KiB
C

#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);
}