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HMAC-SHA256, HMAC-SHA224 according to HMAC-SHA1
Successfully passed unit tests.
This commit is contained in:
Pavel Tvrdík
parent
b813656c58
commit
e7ac4efd54
198
lib/sha256.c
198
lib/sha256.c
@ -342,120 +342,124 @@ sha256_final(sha256_context *ctx)
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return ctx->buf;
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}
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/**
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* HMAC
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* SHA256-HMAC
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*/
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/* Create a new context. On error NULL is returned and errno is set
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appropriately. If KEY is given the function computes HMAC using
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this key; with KEY given as NULL, a plain SHA-256 digest is
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computed. */
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static void
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sha256_hash_buffer(byte *outbuf, const byte *buffer, size_t length)
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{
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sha256_context hd_tmp;
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sha256_init(&hd_tmp);
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sha256_update(&hd_tmp, buffer, length);
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memcpy(outbuf, sha256_final(&hd_tmp), SHA256_SIZE);
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}
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void
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sha256_hmac_init(sha256_hmac_context *ctx, const void *key, size_t keylen)
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sha256_hmac_init(sha256_hmac_context *ctx, const byte *key, size_t keylen)
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{
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sha256_init(&ctx->ctx);
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byte keybuf[SHA256_BLOCK_SIZE], buf[SHA256_BLOCK_SIZE];
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ctx->finalized = 0;
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ctx->use_hmac = 0;
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if (key)
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// Hash the key if necessary
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if (keylen <= SHA256_BLOCK_SIZE)
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{
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int i;
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unsigned char ipad[64];
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memset(ipad, 0, 64);
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memset(ctx->opad, 0, 64);
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if (keylen <= 64)
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{
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memcpy(ipad, key, keylen);
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memcpy(ctx->opad, key, keylen);
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}
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else
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{
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sha256_hmac_context tmp_ctx;
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sha256_hmac_init(&tmp_ctx, NULL, 0);
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sha256_hmac_update(&tmp_ctx, key, keylen);
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sha256_final(&tmp_ctx.ctx);
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memcpy(ipad, tmp_ctx.ctx.buf, 32);
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memcpy(ctx->opad, tmp_ctx.ctx.buf, 32);
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}
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for(i=0; i < 64; i++)
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{
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ipad[i] ^= 0x36;
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ctx->opad[i] ^= 0x5c;
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}
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ctx->use_hmac = 1;
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sha256_hmac_update(ctx, ipad, 64);
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memcpy(keybuf, key, keylen);
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bzero(keybuf + keylen, SHA256_BLOCK_SIZE - keylen);
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}
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else
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{
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sha256_hash_buffer(keybuf, key, keylen);
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bzero(keybuf + SHA256_SIZE, SHA256_BLOCK_SIZE - SHA256_SIZE);
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}
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// Initialize the inner digest
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sha256_init(&ctx->ictx);
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int i;
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for (i = 0; i < SHA256_BLOCK_SIZE; i++)
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buf[i] = keybuf[i] ^ 0x36;
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sha256_update(&ctx->ictx, buf, SHA256_BLOCK_SIZE);
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// Initialize the outer digest
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sha256_init(&ctx->octx);
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for (i = 0; i < SHA256_BLOCK_SIZE; i++)
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buf[i] = keybuf[i] ^ 0x5c;
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sha256_update(&ctx->octx, buf, SHA256_BLOCK_SIZE);
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}
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void sha224_hmac_init(sha224_hmac_context *ctx, const void *key, size_t keylen)
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void sha256_hmac_update(sha256_hmac_context *ctx, const byte *buf, size_t buflen)
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{
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sha224_init(&ctx->ctx);
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ctx->finalized = 0;
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ctx->use_hmac = 0;
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if (key)
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{
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int i;
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unsigned char ipad[64];
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memset(ipad, 0, 64);
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memset(ctx->opad, 0, 64);
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if (keylen <= 64)
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{
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memcpy(ipad, key, keylen);
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memcpy(ctx->opad, key, keylen);
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}
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else
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{
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sha224_hmac_context tmp_ctx;
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sha224_hmac_init(&tmp_ctx, NULL, 0);
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sha224_hmac_update(&tmp_ctx, key, keylen);
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sha224_final(&tmp_ctx.ctx);
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memcpy(ipad, tmp_ctx.ctx.buf, 32);
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memcpy(ctx->opad, tmp_ctx.ctx.buf, 32);
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}
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for(i=0; i < 64; i++)
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{
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ipad[i] ^= 0x36;
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ctx->opad[i] ^= 0x5c;
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}
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ctx->use_hmac = 1;
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sha224_hmac_update(ctx, ipad, 64);
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}
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// Just update the inner digest
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sha256_update(&ctx->ictx, buf, buflen);
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}
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byte *sha256_hmac_final(sha256_hmac_context *hd)
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{
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// Finish the inner digest
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byte *isha = sha256_final(&hd->ictx);
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// Finish the outer digest
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sha256_update(&hd->octx, isha, SHA256_SIZE);
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return sha256_final(&hd->octx);
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}
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/**
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* SHA224-HMAC
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*/
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static void
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sha224_hash_buffer(byte *outbuf, const byte *buffer, size_t length)
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{
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sha224_context hd_tmp;
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sha224_init(&hd_tmp);
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sha224_update(&hd_tmp, buffer, length);
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memcpy(outbuf, sha224_final(&hd_tmp), SHA224_SIZE);
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}
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/* Update the message digest with the contents of BUFFER containing
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LENGTH bytes. */
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void
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sha256_hmac_update(sha256_hmac_context *ctx, const void *buffer, size_t length)
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sha224_hmac_init(sha224_hmac_context *ctx, const byte *key, size_t keylen)
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{
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sha256_update(&ctx->ctx, buffer, length);
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}
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byte keybuf[SHA224_BLOCK_SIZE], buf[SHA224_BLOCK_SIZE];
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/* Finalize an operation and return the digest. If R_DLEN is not NULL
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the length of the digest will be stored at that address. The
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returned value is valid as long as the context exists. On error
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NULL is returned. */
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byte *
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sha256_hmac_final(sha256_hmac_context *ctx)
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{
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sha256_final(&ctx->ctx);
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if (ctx->use_hmac)
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// Hash the key if necessary
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if (keylen <= SHA224_BLOCK_SIZE)
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{
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sha256_hmac_context tmp_ctx;
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sha256_hmac_init(&tmp_ctx, NULL, 0);
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sha256_hmac_update(&tmp_ctx, ctx->opad, 64);
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sha256_hmac_update(&tmp_ctx, ctx->ctx.buf, 32);
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sha256_final(&tmp_ctx.ctx);
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memcpy(ctx->ctx.buf, tmp_ctx.ctx.buf, 32);
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memcpy(keybuf, key, keylen);
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bzero(keybuf + keylen, SHA224_BLOCK_SIZE - keylen);
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}
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return ctx->ctx.buf;
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else
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{
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sha224_hash_buffer(keybuf, key, keylen);
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bzero(keybuf + SHA224_SIZE, SHA224_BLOCK_SIZE - SHA224_SIZE);
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}
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// Initialize the inner digest
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sha224_init(&ctx->ictx);
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int i;
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for (i = 0; i < SHA224_BLOCK_SIZE; i++)
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buf[i] = keybuf[i] ^ 0x36;
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sha224_update(&ctx->ictx, buf, SHA224_BLOCK_SIZE);
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// Initialize the outer digest
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sha224_init(&ctx->octx);
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for (i = 0; i < SHA224_BLOCK_SIZE; i++)
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buf[i] = keybuf[i] ^ 0x5c;
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sha224_update(&ctx->octx, buf, SHA224_BLOCK_SIZE);
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}
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void sha224_hmac_update(sha224_hmac_context *ctx, const byte *buf, size_t buflen)
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{
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// Just update the inner digest
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sha256_update(&ctx->ictx, buf, buflen);
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}
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byte *sha224_hmac_final(sha224_hmac_context *hd)
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{
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// Finish the inner digest
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byte *isha = sha224_final(&hd->ictx);
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// Finish the outer digest
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sha224_update(&hd->octx, isha, SHA224_SIZE);
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return sha224_final(&hd->octx);
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}
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34
lib/sha256.h
34
lib/sha256.h
@ -14,15 +14,17 @@
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#include "sysdep/config.h"
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#define SHA256_SIZE 32
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#define SHA256_HEX_SIZE 65
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#define SHA224_SIZE 28
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#define SHA224_HEX_SIZE 57
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#define SHA224_BLOCK_SIZE 64
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#define SHA256_SIZE 32
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#define SHA256_HEX_SIZE 65
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#define SHA256_BLOCK_SIZE 64
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typedef struct {
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u32 h0,h1,h2,h3,h4,h5,h6,h7;
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byte buf[128];
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byte buf[128]; /* 128 is for SHA384 and SHA512 support, otherwise for SHA224 and SHA256 is 64 enough */
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u32 nblocks;
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u32 nblocks_high;
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int count;
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@ -46,30 +48,22 @@ byte* sha224_final(sha224_context *ctx)
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}
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/**
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* HMAC-SHA256 & HMAC-SHA224
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* HMAC-SHA256, HMAC-SHA224
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*/
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typedef struct
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{
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sha256_context ctx;
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int finalized:1;
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int use_hmac:1;
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byte opad[64];
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sha256_context ictx;
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sha256_context octx;
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} sha256_hmac_context;
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typedef sha256_hmac_context sha224_hmac_context;
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void sha256_hmac_init(sha256_hmac_context *ctx, const void *key, size_t keylen);
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void sha224_hmac_init(sha224_hmac_context *ctx, const void *key, size_t keylen);
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void sha256_hmac_init(sha256_hmac_context *ctx, const byte *key, size_t keylen);
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void sha224_hmac_init(sha224_hmac_context *ctx, const byte *key, size_t keylen);
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void sha256_hmac_update(sha256_hmac_context *ctx, const void *buf, size_t buflen);
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void sha224_hmac_update(sha224_hmac_context *ctx, const void *buf, size_t buflen)
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{
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sha256_hmac_update(ctx, buf, buflen);
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}
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void sha256_hmac_update(sha256_hmac_context *ctx, const byte *buf, size_t buflen);
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void sha224_hmac_update(sha224_hmac_context *ctx, const byte *buf, size_t buflen);
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byte *sha256_hmac_final(sha256_hmac_context *ctx);
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byte *sha224_hmac_final(sha224_hmac_context *ctx)
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{
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return sha256_hmac_final(ctx);
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}
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byte *sha224_hmac_final(sha224_hmac_context *ctx);
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#endif /* _BIRD_SHA256_H_ */
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@ -1,37 +0,0 @@
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/*
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* BIRD -- HMAC-SHA256 Message Authentication
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*
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* (c) 2015 CZ.NIC z.s.p.o.
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*
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* Based on the code from libgcrypt-1.6.0, which is
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* (c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_SHA256_HMAC_H_
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#define _BIRD_SHA256_HMAC_H_
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#define SHA256_SIZE 32
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#define SHA256_HEX_SIZE 65
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#define SHA224_SIZE 28
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#define SHA224_HEX_SIZE 57
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/* The context used by this module. */
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typedef struct
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{
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u32 h0, h1, h2, h3, h4, h5, h6, h7;
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u32 nblocks;
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int count;
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int finalized:1;
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int use_hmac:1;
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byte buf[64];
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byte opad[64];
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} sha256_hmac_context;
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void sha256_hmac_init(sha256_hmac_context *ctx, const void *key, size_t keylen);
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void sha256_hmac_update(sha256_hmac_context *ctx, const void *buf, size_t buflen);
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const byte *sha256_hmac_final(sha256_hmac_context *ctx);
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#endif /* _BIRD_SHA256_HMAC_H_ */
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@ -149,7 +149,6 @@ t_sha256_concating(void)
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return BT_SUCCESS;
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}
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#define HMAC_BUFFER_SIZE 160
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struct hmac_data_in {
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byte key[HMAC_BUFFER_SIZE];
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@ -169,13 +168,13 @@ get_sha256_hmac(const struct hmac_data_in in, char (*out_hash)[SHA256_HEX_SIZE])
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}
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static void
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get_sha224_hmac(const struct hmac_data_in in, char (*out_hash)[SHA256_HEX_SIZE])
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get_sha224_hmac(const struct hmac_data_in in, char (*out_hash)[SHA224_HEX_SIZE])
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{
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sha224_hmac_context ctx;
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sha224_hmac_init(&ctx, in.key, in.key_len);
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sha224_hmac_update(&ctx, in.data, in.data_len);
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byte *hash_byte = sha224_hmac_final(&ctx);
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byte_to_hex((char*)out_hash, hash_byte, SHA224_HEX_SIZE);
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byte_to_hex((char*)out_hash, hash_byte, SHA224_SIZE);
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}
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@ -317,7 +316,7 @@ t_sha224_hmac(void)
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{
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struct in_out {
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struct hmac_data_in in;
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char out[SHA256_HEX_SIZE];
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char out[SHA224_HEX_SIZE];
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} in_out[] = {
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{
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.in = {
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@ -387,7 +386,7 @@ t_sha224_hmac(void)
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.data = "Test With Truncation",
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.data_len = 20,
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},
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.out = "0e2aea68a90c8d37c988bcdb9fca6fa8",
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.out = "0e2aea68a90c8d37c988bcdb9fca6fa8099cd857c7ec4a1815cac54c",
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},
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{
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.in = {
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