150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
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* Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: hmacmd5.c,v 1.16 2009/02/06 23:47:42 tbox Exp $ */
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/*! \file
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* This code implements the HMAC-MD5 keyed hash algorithm
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* described in RFC2104.
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*/
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#include "config.h"
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#include <isc/assertions.h>
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#include <isc/hmacmd5.h>
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#include <isc/md5.h>
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#include <isc/platform.h>
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#include <isc/string.h>
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#include <isc/types.h>
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#include <isc/util.h>
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#ifdef ISC_PLATFORM_OPENSSLHASH
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void
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isc_hmacmd5_init(isc_hmacmd5_t *ctx, const unsigned char *key,
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unsigned int len)
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{
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HMAC_Init(ctx, (const void *) key, (int) len, EVP_md5());
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}
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void
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isc_hmacmd5_invalidate(isc_hmacmd5_t *ctx) {
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HMAC_CTX_cleanup(ctx);
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}
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void
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isc_hmacmd5_update(isc_hmacmd5_t *ctx, const unsigned char *buf,
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unsigned int len)
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{
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HMAC_Update(ctx, buf, (int) len);
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}
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void
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isc_hmacmd5_sign(isc_hmacmd5_t *ctx, unsigned char *digest) {
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HMAC_Final(ctx, digest, NULL);
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HMAC_CTX_cleanup(ctx);
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}
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#else
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#define PADLEN 64
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#define IPAD 0x36
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#define OPAD 0x5C
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/*!
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* Start HMAC-MD5 process. Initialize an md5 context and digest the key.
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*/
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void
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isc_hmacmd5_init(isc_hmacmd5_t *ctx, const unsigned char *key,
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unsigned int len)
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{
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unsigned char ipad[PADLEN];
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int i;
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memset(ctx->key, 0, sizeof(ctx->key));
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if (len > sizeof(ctx->key)) {
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isc_md5_t md5ctx;
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isc_md5_init(&md5ctx);
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isc_md5_update(&md5ctx, key, len);
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isc_md5_final(&md5ctx, ctx->key);
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} else
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memcpy(ctx->key, key, len);
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isc_md5_init(&ctx->md5ctx);
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memset(ipad, IPAD, sizeof(ipad));
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for (i = 0; i < PADLEN; i++)
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ipad[i] ^= ctx->key[i];
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isc_md5_update(&ctx->md5ctx, ipad, sizeof(ipad));
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}
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void
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isc_hmacmd5_invalidate(isc_hmacmd5_t *ctx) {
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isc_md5_invalidate(&ctx->md5ctx);
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memset(ctx->key, 0, sizeof(ctx->key));
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}
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/*!
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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void
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isc_hmacmd5_update(isc_hmacmd5_t *ctx, const unsigned char *buf,
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unsigned int len)
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{
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isc_md5_update(&ctx->md5ctx, buf, len);
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}
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/*!
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* Compute signature - finalize MD5 operation and reapply MD5.
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*/
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void
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isc_hmacmd5_sign(isc_hmacmd5_t *ctx, unsigned char *digest) {
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unsigned char opad[PADLEN];
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int i;
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isc_md5_final(&ctx->md5ctx, digest);
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memset(opad, OPAD, sizeof(opad));
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for (i = 0; i < PADLEN; i++)
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opad[i] ^= ctx->key[i];
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isc_md5_init(&ctx->md5ctx);
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isc_md5_update(&ctx->md5ctx, opad, sizeof(opad));
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isc_md5_update(&ctx->md5ctx, digest, ISC_MD5_DIGESTLENGTH);
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isc_md5_final(&ctx->md5ctx, digest);
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isc_hmacmd5_invalidate(ctx);
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}
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#endif /* !ISC_PLATFORM_OPENSSLHASH */
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/*!
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* Verify signature - finalize MD5 operation and reapply MD5, then
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* compare to the supplied digest.
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*/
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isc_boolean_t
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isc_hmacmd5_verify(isc_hmacmd5_t *ctx, unsigned char *digest) {
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return (isc_hmacmd5_verify2(ctx, digest, ISC_MD5_DIGESTLENGTH));
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}
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isc_boolean_t
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isc_hmacmd5_verify2(isc_hmacmd5_t *ctx, unsigned char *digest, size_t len) {
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unsigned char newdigest[ISC_MD5_DIGESTLENGTH];
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REQUIRE(len <= ISC_MD5_DIGESTLENGTH);
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isc_hmacmd5_sign(ctx, newdigest);
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return (ISC_TF(memcmp(digest, newdigest, len) == 0));
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}
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