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/*
* Copyright (C) 2005-2007 Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: hmacsha.c,v 1.8 2007/08/27 03:27:53 marka Exp $ */
/*
* This code implements the HMAC-SHA1, HMAC-SHA224, HMAC-SHA256, HMAC-SHA384
* and HMAC-SHA512 keyed hash algorithm described in RFC 2104 and
* draft-ietf-dnsext-tsig-sha-01.txt.
*/
#include "config.h"
#include <isc/assertions.h>
#include <isc/hmacsha.h>
#include <isc/sha1.h>
#include <isc/sha2.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/util.h>
#define IPAD 0x36
#define OPAD 0x5C
/*
* Start HMAC-SHA1 process. Initialize an sha1 context and digest the key.
*/
void
isc_hmacsha1_init(isc_hmacsha1_t *ctx, const unsigned char *key,
unsigned int len)
{
unsigned char ipad[ISC_SHA1_BLOCK_LENGTH];
unsigned int i;
memset(ctx->key, 0, sizeof(ctx->key));
if (len > sizeof(ctx->key)) {
isc_sha1_t sha1ctx;
isc_sha1_init(&sha1ctx);
isc_sha1_update(&sha1ctx, key, len);
isc_sha1_final(&sha1ctx, ctx->key);
} else
memcpy(ctx->key, key, len);
isc_sha1_init(&ctx->sha1ctx);
memset(ipad, IPAD, sizeof(ipad));
for (i = 0; i < ISC_SHA1_BLOCK_LENGTH; i++)
ipad[i] ^= ctx->key[i];
isc_sha1_update(&ctx->sha1ctx, ipad, sizeof(ipad));
}
void
isc_hmacsha1_invalidate(isc_hmacsha1_t *ctx) {
isc_sha1_invalidate(&ctx->sha1ctx);
memset(ctx->key, 0, sizeof(ctx->key));
memset(ctx, 0, sizeof(ctx));
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void
isc_hmacsha1_update(isc_hmacsha1_t *ctx, const unsigned char *buf,
unsigned int len)
{
isc_sha1_update(&ctx->sha1ctx, buf, len);
}
/*
* Compute signature - finalize SHA1 operation and reapply SHA1.
*/
void
isc_hmacsha1_sign(isc_hmacsha1_t *ctx, unsigned char *digest, size_t len) {
unsigned char opad[ISC_SHA1_BLOCK_LENGTH];
unsigned char newdigest[ISC_SHA1_DIGESTLENGTH];
unsigned int i;
REQUIRE(len <= ISC_SHA1_DIGESTLENGTH);
isc_sha1_final(&ctx->sha1ctx, newdigest);
memset(opad, OPAD, sizeof(opad));
for (i = 0; i < ISC_SHA1_BLOCK_LENGTH; i++)
opad[i] ^= ctx->key[i];
isc_sha1_init(&ctx->sha1ctx);
isc_sha1_update(&ctx->sha1ctx, opad, sizeof(opad));
isc_sha1_update(&ctx->sha1ctx, newdigest, ISC_SHA1_DIGESTLENGTH);
isc_sha1_final(&ctx->sha1ctx, newdigest);
isc_hmacsha1_invalidate(ctx);
memcpy(digest, newdigest, len);
memset(newdigest, 0, sizeof(newdigest));
}
/*
* Verify signature - finalize SHA1 operation and reapply SHA1, then
* compare to the supplied digest.
*/
isc_boolean_t
isc_hmacsha1_verify(isc_hmacsha1_t *ctx, unsigned char *digest, size_t len) {
unsigned char newdigest[ISC_SHA1_DIGESTLENGTH];
REQUIRE(len <= ISC_SHA1_DIGESTLENGTH);
isc_hmacsha1_sign(ctx, newdigest, ISC_SHA1_DIGESTLENGTH);
return (ISC_TF(memcmp(digest, newdigest, len) == 0));
}
/*
* Start HMAC-SHA224 process. Initialize an sha224 context and digest the key.
*/
void
isc_hmacsha224_init(isc_hmacsha224_t *ctx, const unsigned char *key,
unsigned int len)
{
unsigned char ipad[ISC_SHA224_BLOCK_LENGTH];
unsigned int i;
memset(ctx->key, 0, sizeof(ctx->key));
if (len > sizeof(ctx->key)) {
isc_sha224_t sha224ctx;
isc_sha224_init(&sha224ctx);
isc_sha224_update(&sha224ctx, key, len);
isc_sha224_final(ctx->key, &sha224ctx);
} else
memcpy(ctx->key, key, len);
isc_sha224_init(&ctx->sha224ctx);
memset(ipad, IPAD, sizeof(ipad));
for (i = 0; i < ISC_SHA224_BLOCK_LENGTH; i++)
ipad[i] ^= ctx->key[i];
isc_sha224_update(&ctx->sha224ctx, ipad, sizeof(ipad));
}
void
isc_hmacsha224_invalidate(isc_hmacsha224_t *ctx) {
memset(ctx->key, 0, sizeof(ctx->key));
memset(ctx, 0, sizeof(ctx));
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void
isc_hmacsha224_update(isc_hmacsha224_t *ctx, const unsigned char *buf,
unsigned int len)
{
isc_sha224_update(&ctx->sha224ctx, buf, len);
}
/*
* Compute signature - finalize SHA224 operation and reapply SHA224.
*/
void
isc_hmacsha224_sign(isc_hmacsha224_t *ctx, unsigned char *digest, size_t len) {
unsigned char opad[ISC_SHA224_BLOCK_LENGTH];
unsigned char newdigest[ISC_SHA224_DIGESTLENGTH];
unsigned int i;
REQUIRE(len <= ISC_SHA224_DIGESTLENGTH);
isc_sha224_final(newdigest, &ctx->sha224ctx);
memset(opad, OPAD, sizeof(opad));
for (i = 0; i < ISC_SHA224_BLOCK_LENGTH; i++)
opad[i] ^= ctx->key[i];
isc_sha224_init(&ctx->sha224ctx);
isc_sha224_update(&ctx->sha224ctx, opad, sizeof(opad));
isc_sha224_update(&ctx->sha224ctx, newdigest, ISC_SHA224_DIGESTLENGTH);
isc_sha224_final(newdigest, &ctx->sha224ctx);
memcpy(digest, newdigest, len);
memset(newdigest, 0, sizeof(newdigest));
}
/*
* Verify signature - finalize SHA224 operation and reapply SHA224, then
* compare to the supplied digest.
*/
isc_boolean_t
isc_hmacsha224_verify(isc_hmacsha224_t *ctx, unsigned char *digest, size_t len) {
unsigned char newdigest[ISC_SHA224_DIGESTLENGTH];
REQUIRE(len <= ISC_SHA224_DIGESTLENGTH);
isc_hmacsha224_sign(ctx, newdigest, ISC_SHA224_DIGESTLENGTH);
return (ISC_TF(memcmp(digest, newdigest, len) == 0));
}
/*
* Start HMAC-SHA256 process. Initialize an sha256 context and digest the key.
*/
void
isc_hmacsha256_init(isc_hmacsha256_t *ctx, const unsigned char *key,
unsigned int len)
{
unsigned char ipad[ISC_SHA256_BLOCK_LENGTH];
unsigned int i;
memset(ctx->key, 0, sizeof(ctx->key));
if (len > sizeof(ctx->key)) {
isc_sha256_t sha256ctx;
isc_sha256_init(&sha256ctx);
isc_sha256_update(&sha256ctx, key, len);
isc_sha256_final(ctx->key, &sha256ctx);
} else
memcpy(ctx->key, key, len);
isc_sha256_init(&ctx->sha256ctx);
memset(ipad, IPAD, sizeof(ipad));
for (i = 0; i < ISC_SHA256_BLOCK_LENGTH; i++)
ipad[i] ^= ctx->key[i];
isc_sha256_update(&ctx->sha256ctx, ipad, sizeof(ipad));
}
void
isc_hmacsha256_invalidate(isc_hmacsha256_t *ctx) {
memset(ctx->key, 0, sizeof(ctx->key));
memset(ctx, 0, sizeof(ctx));
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void
isc_hmacsha256_update(isc_hmacsha256_t *ctx, const unsigned char *buf,
unsigned int len)
{
isc_sha256_update(&ctx->sha256ctx, buf, len);
}
/*
* Compute signature - finalize SHA256 operation and reapply SHA256.
*/
void
isc_hmacsha256_sign(isc_hmacsha256_t *ctx, unsigned char *digest, size_t len) {
unsigned char opad[ISC_SHA256_BLOCK_LENGTH];
unsigned char newdigest[ISC_SHA256_DIGESTLENGTH];
unsigned int i;
REQUIRE(len <= ISC_SHA256_DIGESTLENGTH);
isc_sha256_final(newdigest, &ctx->sha256ctx);
memset(opad, OPAD, sizeof(opad));
for (i = 0; i < ISC_SHA256_BLOCK_LENGTH; i++)
opad[i] ^= ctx->key[i];
isc_sha256_init(&ctx->sha256ctx);
isc_sha256_update(&ctx->sha256ctx, opad, sizeof(opad));
isc_sha256_update(&ctx->sha256ctx, newdigest, ISC_SHA256_DIGESTLENGTH);
isc_sha256_final(newdigest, &ctx->sha256ctx);
memcpy(digest, newdigest, len);
memset(newdigest, 0, sizeof(newdigest));
}
/*
* Verify signature - finalize SHA256 operation and reapply SHA256, then
* compare to the supplied digest.
*/
isc_boolean_t
isc_hmacsha256_verify(isc_hmacsha256_t *ctx, unsigned char *digest, size_t len) {
unsigned char newdigest[ISC_SHA256_DIGESTLENGTH];
REQUIRE(len <= ISC_SHA256_DIGESTLENGTH);
isc_hmacsha256_sign(ctx, newdigest, ISC_SHA256_DIGESTLENGTH);
return (ISC_TF(memcmp(digest, newdigest, len) == 0));
}
/*
* Start HMAC-SHA384 process. Initialize an sha384 context and digest the key.
*/
void
isc_hmacsha384_init(isc_hmacsha384_t *ctx, const unsigned char *key,
unsigned int len)
{
unsigned char ipad[ISC_SHA384_BLOCK_LENGTH];
unsigned int i;
memset(ctx->key, 0, sizeof(ctx->key));
if (len > sizeof(ctx->key)) {
isc_sha384_t sha384ctx;
isc_sha384_init(&sha384ctx);
isc_sha384_update(&sha384ctx, key, len);
isc_sha384_final(ctx->key, &sha384ctx);
} else
memcpy(ctx->key, key, len);
isc_sha384_init(&ctx->sha384ctx);
memset(ipad, IPAD, sizeof(ipad));
for (i = 0; i < ISC_SHA384_BLOCK_LENGTH; i++)
ipad[i] ^= ctx->key[i];
isc_sha384_update(&ctx->sha384ctx, ipad, sizeof(ipad));
}
void
isc_hmacsha384_invalidate(isc_hmacsha384_t *ctx) {
memset(ctx->key, 0, sizeof(ctx->key));
memset(ctx, 0, sizeof(ctx));
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void
isc_hmacsha384_update(isc_hmacsha384_t *ctx, const unsigned char *buf,
unsigned int len)
{
isc_sha384_update(&ctx->sha384ctx, buf, len);
}
/*
* Compute signature - finalize SHA384 operation and reapply SHA384.
*/
void
isc_hmacsha384_sign(isc_hmacsha384_t *ctx, unsigned char *digest, size_t len) {
unsigned char opad[ISC_SHA384_BLOCK_LENGTH];
unsigned char newdigest[ISC_SHA384_DIGESTLENGTH];
unsigned int i;
REQUIRE(len <= ISC_SHA384_DIGESTLENGTH);
isc_sha384_final(newdigest, &ctx->sha384ctx);
memset(opad, OPAD, sizeof(opad));
for (i = 0; i < ISC_SHA384_BLOCK_LENGTH; i++)
opad[i] ^= ctx->key[i];
isc_sha384_init(&ctx->sha384ctx);
isc_sha384_update(&ctx->sha384ctx, opad, sizeof(opad));
isc_sha384_update(&ctx->sha384ctx, newdigest, ISC_SHA384_DIGESTLENGTH);
isc_sha384_final(newdigest, &ctx->sha384ctx);
memcpy(digest, newdigest, len);
memset(newdigest, 0, sizeof(newdigest));
}
/*
* Verify signature - finalize SHA384 operation and reapply SHA384, then
* compare to the supplied digest.
*/
isc_boolean_t
isc_hmacsha384_verify(isc_hmacsha384_t *ctx, unsigned char *digest, size_t len) {
unsigned char newdigest[ISC_SHA384_DIGESTLENGTH];
REQUIRE(len <= ISC_SHA384_DIGESTLENGTH);
isc_hmacsha384_sign(ctx, newdigest, ISC_SHA384_DIGESTLENGTH);
return (ISC_TF(memcmp(digest, newdigest, len) == 0));
}
/*
* Start HMAC-SHA512 process. Initialize an sha512 context and digest the key.
*/
void
isc_hmacsha512_init(isc_hmacsha512_t *ctx, const unsigned char *key,
unsigned int len)
{
unsigned char ipad[ISC_SHA512_BLOCK_LENGTH];
unsigned int i;
memset(ctx->key, 0, sizeof(ctx->key));
if (len > sizeof(ctx->key)) {
isc_sha512_t sha512ctx;
isc_sha512_init(&sha512ctx);
isc_sha512_update(&sha512ctx, key, len);
isc_sha512_final(ctx->key, &sha512ctx);
} else
memcpy(ctx->key, key, len);
isc_sha512_init(&ctx->sha512ctx);
memset(ipad, IPAD, sizeof(ipad));
for (i = 0; i < ISC_SHA512_BLOCK_LENGTH; i++)
ipad[i] ^= ctx->key[i];
isc_sha512_update(&ctx->sha512ctx, ipad, sizeof(ipad));
}
void
isc_hmacsha512_invalidate(isc_hmacsha512_t *ctx) {
memset(ctx->key, 0, sizeof(ctx->key));
memset(ctx, 0, sizeof(ctx));
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void
isc_hmacsha512_update(isc_hmacsha512_t *ctx, const unsigned char *buf,
unsigned int len)
{
isc_sha512_update(&ctx->sha512ctx, buf, len);
}
/*
* Compute signature - finalize SHA512 operation and reapply SHA512.
*/
void
isc_hmacsha512_sign(isc_hmacsha512_t *ctx, unsigned char *digest, size_t len) {
unsigned char opad[ISC_SHA512_BLOCK_LENGTH];
unsigned char newdigest[ISC_SHA512_DIGESTLENGTH];
unsigned int i;
REQUIRE(len <= ISC_SHA512_DIGESTLENGTH);
isc_sha512_final(newdigest, &ctx->sha512ctx);
memset(opad, OPAD, sizeof(opad));
for (i = 0; i < ISC_SHA512_BLOCK_LENGTH; i++)
opad[i] ^= ctx->key[i];
isc_sha512_init(&ctx->sha512ctx);
isc_sha512_update(&ctx->sha512ctx, opad, sizeof(opad));
isc_sha512_update(&ctx->sha512ctx, newdigest, ISC_SHA512_DIGESTLENGTH);
isc_sha512_final(newdigest, &ctx->sha512ctx);
memcpy(digest, newdigest, len);
memset(newdigest, 0, sizeof(newdigest));
}
/*
* Verify signature - finalize SHA512 operation and reapply SHA512, then
* compare to the supplied digest.
*/
isc_boolean_t
isc_hmacsha512_verify(isc_hmacsha512_t *ctx, unsigned char *digest, size_t len) {
unsigned char newdigest[ISC_SHA512_DIGESTLENGTH];
REQUIRE(len <= ISC_SHA512_DIGESTLENGTH);
isc_hmacsha512_sign(ctx, newdigest, ISC_SHA512_DIGESTLENGTH);
return (ISC_TF(memcmp(digest, newdigest, len) == 0));
}
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