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HMAC-SHA256, HMAC-SHA224 according to HMAC-SHA1

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Successfully passed unit tests.
This commit is contained in:
Pavel Tvrdík 2015-04-29 13:39:32 +02:00
parent b813656c58
commit e7ac4efd54
4 changed files with 119 additions and 159 deletions
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180
lib/sha256.c
View File

@ -342,120 +342,124 @@ sha256_final(sha256_context *ctx)
return ctx->buf; return ctx->buf;
} }
/** /**
* HMAC * SHA256-HMAC
*/ */
/* Create a new context. On error NULL is returned and errno is set static void
appropriately. If KEY is given the function computes HMAC using sha256_hash_buffer(byte *outbuf, const byte *buffer, size_t length)
this key; with KEY given as NULL, a plain SHA-256 digest is
computed. */
void
sha256_hmac_init(sha256_hmac_context *ctx, const void *key, size_t keylen)
{ {
sha256_init(&ctx->ctx); sha256_context hd_tmp;
ctx->finalized = 0; sha256_init(&hd_tmp);
ctx->use_hmac = 0; sha256_update(&hd_tmp, buffer, length);
memcpy(outbuf, sha256_final(&hd_tmp), SHA256_SIZE);
}
if (key) void
sha256_hmac_init(sha256_hmac_context *ctx, const byte *key, size_t keylen)
{
byte keybuf[SHA256_BLOCK_SIZE], buf[SHA256_BLOCK_SIZE];
// Hash the key if necessary
if (keylen <= SHA256_BLOCK_SIZE)
{ {
int i; memcpy(keybuf, key, keylen);
unsigned char ipad[64]; bzero(keybuf + keylen, SHA256_BLOCK_SIZE - keylen);
memset(ipad, 0, 64);
memset(ctx->opad, 0, 64);
if (keylen <= 64)
{
memcpy(ipad, key, keylen);
memcpy(ctx->opad, key, keylen);
} }
else else
{ {
sha256_hmac_context tmp_ctx; sha256_hash_buffer(keybuf, key, keylen);
bzero(keybuf + SHA256_SIZE, SHA256_BLOCK_SIZE - SHA256_SIZE);
}
sha256_hmac_init(&tmp_ctx, NULL, 0); // Initialize the inner digest
sha256_hmac_update(&tmp_ctx, key, keylen); sha256_init(&ctx->ictx);
sha256_final(&tmp_ctx.ctx); int i;
memcpy(ipad, tmp_ctx.ctx.buf, 32); for (i = 0; i < SHA256_BLOCK_SIZE; i++)
memcpy(ctx->opad, tmp_ctx.ctx.buf, 32); buf[i] = keybuf[i] ^ 0x36;
} sha256_update(&ctx->ictx, buf, SHA256_BLOCK_SIZE);
for(i=0; i < 64; i++)
{ // Initialize the outer digest
ipad[i] ^= 0x36; sha256_init(&ctx->octx);
ctx->opad[i] ^= 0x5c; for (i = 0; i < SHA256_BLOCK_SIZE; i++)
} buf[i] = keybuf[i] ^ 0x5c;
ctx->use_hmac = 1; sha256_update(&ctx->octx, buf, SHA256_BLOCK_SIZE);
sha256_hmac_update(ctx, ipad, 64);
}
} }
void sha224_hmac_init(sha224_hmac_context *ctx, const void *key, size_t keylen) void sha256_hmac_update(sha256_hmac_context *ctx, const byte *buf, size_t buflen)
{ {
sha224_init(&ctx->ctx); // Just update the inner digest
sha256_update(&ctx->ictx, buf, buflen);
}
ctx->finalized = 0; byte *sha256_hmac_final(sha256_hmac_context *hd)
ctx->use_hmac = 0; {
// Finish the inner digest
byte *isha = sha256_final(&hd->ictx);
if (key) // Finish the outer digest
sha256_update(&hd->octx, isha, SHA256_SIZE);
return sha256_final(&hd->octx);
}
/**
* SHA224-HMAC
*/
static void
sha224_hash_buffer(byte *outbuf, const byte *buffer, size_t length)
{
sha224_context hd_tmp;
sha224_init(&hd_tmp);
sha224_update(&hd_tmp, buffer, length);
memcpy(outbuf, sha224_final(&hd_tmp), SHA224_SIZE);
}
void
sha224_hmac_init(sha224_hmac_context *ctx, const byte *key, size_t keylen)
{
byte keybuf[SHA224_BLOCK_SIZE], buf[SHA224_BLOCK_SIZE];
// Hash the key if necessary
if (keylen <= SHA224_BLOCK_SIZE)
{ {
int i; memcpy(keybuf, key, keylen);
unsigned char ipad[64]; bzero(keybuf + keylen, SHA224_BLOCK_SIZE - keylen);
memset(ipad, 0, 64);
memset(ctx->opad, 0, 64);
if (keylen <= 64)
{
memcpy(ipad, key, keylen);
memcpy(ctx->opad, key, keylen);
} }
else else
{ {
sha224_hmac_context tmp_ctx; sha224_hash_buffer(keybuf, key, keylen);
bzero(keybuf + SHA224_SIZE, SHA224_BLOCK_SIZE - SHA224_SIZE);
}
sha224_hmac_init(&tmp_ctx, NULL, 0); // Initialize the inner digest
sha224_hmac_update(&tmp_ctx, key, keylen); sha224_init(&ctx->ictx);
sha224_final(&tmp_ctx.ctx); int i;
memcpy(ipad, tmp_ctx.ctx.buf, 32); for (i = 0; i < SHA224_BLOCK_SIZE; i++)
memcpy(ctx->opad, tmp_ctx.ctx.buf, 32); buf[i] = keybuf[i] ^ 0x36;
} sha224_update(&ctx->ictx, buf, SHA224_BLOCK_SIZE);
for(i=0; i < 64; i++)
{ // Initialize the outer digest
ipad[i] ^= 0x36; sha224_init(&ctx->octx);
ctx->opad[i] ^= 0x5c; for (i = 0; i < SHA224_BLOCK_SIZE; i++)
} buf[i] = keybuf[i] ^ 0x5c;
ctx->use_hmac = 1; sha224_update(&ctx->octx, buf, SHA224_BLOCK_SIZE);
sha224_hmac_update(ctx, ipad, 64);
}
} }
/* Update the message digest with the contents of BUFFER containing void sha224_hmac_update(sha224_hmac_context *ctx, const byte *buf, size_t buflen)
LENGTH bytes. */
void
sha256_hmac_update(sha256_hmac_context *ctx, const void *buffer, size_t length)
{ {
sha256_update(&ctx->ctx, buffer, length); // Just update the inner digest
sha256_update(&ctx->ictx, buf, buflen);
} }
/* Finalize an operation and return the digest. If R_DLEN is not NULL byte *sha224_hmac_final(sha224_hmac_context *hd)
the length of the digest will be stored at that address. The
returned value is valid as long as the context exists. On error
NULL is returned. */
byte *
sha256_hmac_final(sha256_hmac_context *ctx)
{ {
sha256_final(&ctx->ctx); // Finish the inner digest
if (ctx->use_hmac) byte *isha = sha224_final(&hd->ictx);
{
sha256_hmac_context tmp_ctx;
sha256_hmac_init(&tmp_ctx, NULL, 0); // Finish the outer digest
sha256_hmac_update(&tmp_ctx, ctx->opad, 64); sha224_update(&hd->octx, isha, SHA224_SIZE);
sha256_hmac_update(&tmp_ctx, ctx->ctx.buf, 32); return sha224_final(&hd->octx);
sha256_final(&tmp_ctx.ctx);
memcpy(ctx->ctx.buf, tmp_ctx.ctx.buf, 32);
}
return ctx->ctx.buf;
} }

34
lib/sha256.h
View File

@ -14,15 +14,17 @@
#include "sysdep/config.h" #include "sysdep/config.h"
#define SHA256_SIZE 32
#define SHA256_HEX_SIZE 65
#define SHA224_SIZE 28 #define SHA224_SIZE 28
#define SHA224_HEX_SIZE 57 #define SHA224_HEX_SIZE 57
#define SHA224_BLOCK_SIZE 64
#define SHA256_SIZE 32
#define SHA256_HEX_SIZE 65
#define SHA256_BLOCK_SIZE 64
typedef struct { typedef struct {
u32 h0,h1,h2,h3,h4,h5,h6,h7; u32 h0,h1,h2,h3,h4,h5,h6,h7;
byte buf[128]; byte buf[128]; /* 128 is for SHA384 and SHA512 support, otherwise for SHA224 and SHA256 is 64 enough */
u32 nblocks; u32 nblocks;
u32 nblocks_high; u32 nblocks_high;
int count; int count;
@ -46,30 +48,22 @@ byte* sha224_final(sha224_context *ctx)
} }
/** /**
* HMAC-SHA256 & HMAC-SHA224 * HMAC-SHA256, HMAC-SHA224
*/ */
typedef struct typedef struct
{ {
sha256_context ctx; sha256_context ictx;
int finalized:1; sha256_context octx;
int use_hmac:1;
byte opad[64];
} sha256_hmac_context; } sha256_hmac_context;
typedef sha256_hmac_context sha224_hmac_context; typedef sha256_hmac_context sha224_hmac_context;
void sha256_hmac_init(sha256_hmac_context *ctx, const void *key, size_t keylen); void sha256_hmac_init(sha256_hmac_context *ctx, const byte *key, size_t keylen);
void sha224_hmac_init(sha224_hmac_context *ctx, const void *key, size_t keylen); void sha224_hmac_init(sha224_hmac_context *ctx, const byte *key, size_t keylen);
void sha256_hmac_update(sha256_hmac_context *ctx, const void *buf, size_t buflen); void sha256_hmac_update(sha256_hmac_context *ctx, const byte *buf, size_t buflen);
void sha224_hmac_update(sha224_hmac_context *ctx, const void *buf, size_t buflen) void sha224_hmac_update(sha224_hmac_context *ctx, const byte *buf, size_t buflen);
{
sha256_hmac_update(ctx, buf, buflen);
}
byte *sha256_hmac_final(sha256_hmac_context *ctx); byte *sha256_hmac_final(sha256_hmac_context *ctx);
byte *sha224_hmac_final(sha224_hmac_context *ctx) byte *sha224_hmac_final(sha224_hmac_context *ctx);
{
return sha256_hmac_final(ctx);
}
#endif /* _BIRD_SHA256_H_ */ #endif /* _BIRD_SHA256_H_ */

37
lib/sha256_hmac.h
View File

@ -1,37 +0,0 @@
/*
* BIRD -- HMAC-SHA256 Message Authentication
*
* (c) 2015 CZ.NIC z.s.p.o.
*
* Based on the code from libgcrypt-1.6.0, which is
* (c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_SHA256_HMAC_H_
#define _BIRD_SHA256_HMAC_H_
#define SHA256_SIZE 32
#define SHA256_HEX_SIZE 65
#define SHA224_SIZE 28
#define SHA224_HEX_SIZE 57
/* The context used by this module. */
typedef struct
{
u32 h0, h1, h2, h3, h4, h5, h6, h7;
u32 nblocks;
int count;
int finalized:1;
int use_hmac:1;
byte buf[64];
byte opad[64];
} sha256_hmac_context;
void sha256_hmac_init(sha256_hmac_context *ctx, const void *key, size_t keylen);
void sha256_hmac_update(sha256_hmac_context *ctx, const void *buf, size_t buflen);
const byte *sha256_hmac_final(sha256_hmac_context *ctx);
#endif /* _BIRD_SHA256_HMAC_H_ */

9
lib/sha256_test.c
View File

@ -149,7 +149,6 @@ t_sha256_concating(void)
return BT_SUCCESS; return BT_SUCCESS;
} }
#define HMAC_BUFFER_SIZE 160 #define HMAC_BUFFER_SIZE 160
struct hmac_data_in { struct hmac_data_in {
byte key[HMAC_BUFFER_SIZE]; byte key[HMAC_BUFFER_SIZE];
@ -169,13 +168,13 @@ get_sha256_hmac(const struct hmac_data_in in, char (*out_hash)[SHA256_HEX_SIZE])
} }
static void static void
get_sha224_hmac(const struct hmac_data_in in, char (*out_hash)[SHA256_HEX_SIZE]) get_sha224_hmac(const struct hmac_data_in in, char (*out_hash)[SHA224_HEX_SIZE])
{ {
sha224_hmac_context ctx; sha224_hmac_context ctx;
sha224_hmac_init(&ctx, in.key, in.key_len); sha224_hmac_init(&ctx, in.key, in.key_len);
sha224_hmac_update(&ctx, in.data, in.data_len); sha224_hmac_update(&ctx, in.data, in.data_len);
byte *hash_byte = sha224_hmac_final(&ctx); byte *hash_byte = sha224_hmac_final(&ctx);
byte_to_hex((char*)out_hash, hash_byte, SHA224_HEX_SIZE); byte_to_hex((char*)out_hash, hash_byte, SHA224_SIZE);
} }
@ -317,7 +316,7 @@ t_sha224_hmac(void)
{ {
struct in_out { struct in_out {
struct hmac_data_in in; struct hmac_data_in in;
char out[SHA256_HEX_SIZE]; char out[SHA224_HEX_SIZE];
} in_out[] = { } in_out[] = {
{ {
.in = { .in = {
@ -387,7 +386,7 @@ t_sha224_hmac(void)
.data = "Test With Truncation", .data = "Test With Truncation",
.data_len = 20, .data_len = 20,
}, },
.out = "0e2aea68a90c8d37c988bcdb9fca6fa8", .out = "0e2aea68a90c8d37c988bcdb9fca6fa8099cd857c7ec4a1815cac54c",
}, },
{ {
.in = { .in = {