From 047b30cf2f7de0e93a61fc268ea0a4440a16b125 Mon Sep 17 00:00:00 2001 From: Pavol Rusnak Date: Tue, 10 Sep 2013 21:47:06 +0200 Subject: [PATCH] add hmac-sha256/512 --- Makefile | 2 +- hmac.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ hmac.h | 9 ++++++++ 3 files changed, 72 insertions(+), 1 deletion(-) create mode 100644 hmac.c create mode 100644 hmac.h diff --git a/Makefile b/Makefile index fde2829590..dc8f469b37 100644 --- a/Makefile +++ b/Makefile @@ -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 diff --git a/hmac.c b/hmac.c new file mode 100644 index 0000000000..3ea37d6e78 --- /dev/null +++ b/hmac.c @@ -0,0 +1,62 @@ +#include + +#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); +} diff --git a/hmac.h b/hmac.h new file mode 100644 index 0000000000..7481a67a69 --- /dev/null +++ b/hmac.h @@ -0,0 +1,9 @@ +#ifndef __HMAC_H__ +#define __HMAC_H__ + +#include + +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