/contrib/bind9/lib/isc/hmacmd5.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 149 lines · 91 code · 23 blank · 35 comment · 4 complexity · ae21a8c9470eff6ea68028f860e795b0 MD5 · raw file
- /*
- * Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
- * Copyright (C) 2000, 2001 Internet Software Consortium.
- *
- * 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: hmacmd5.c,v 1.16 2009/02/06 23:47:42 tbox Exp $ */
- /*! \file
- * This code implements the HMAC-MD5 keyed hash algorithm
- * described in RFC2104.
- */
- #include "config.h"
- #include <isc/assertions.h>
- #include <isc/hmacmd5.h>
- #include <isc/md5.h>
- #include <isc/platform.h>
- #include <isc/string.h>
- #include <isc/types.h>
- #include <isc/util.h>
- #ifdef ISC_PLATFORM_OPENSSLHASH
- void
- isc_hmacmd5_init(isc_hmacmd5_t *ctx, const unsigned char *key,
- unsigned int len)
- {
- HMAC_Init(ctx, (const void *) key, (int) len, EVP_md5());
- }
- void
- isc_hmacmd5_invalidate(isc_hmacmd5_t *ctx) {
- HMAC_CTX_cleanup(ctx);
- }
- void
- isc_hmacmd5_update(isc_hmacmd5_t *ctx, const unsigned char *buf,
- unsigned int len)
- {
- HMAC_Update(ctx, buf, (int) len);
- }
- void
- isc_hmacmd5_sign(isc_hmacmd5_t *ctx, unsigned char *digest) {
- HMAC_Final(ctx, digest, NULL);
- HMAC_CTX_cleanup(ctx);
- }
- #else
- #define PADLEN 64
- #define IPAD 0x36
- #define OPAD 0x5C
- /*!
- * Start HMAC-MD5 process. Initialize an md5 context and digest the key.
- */
- void
- isc_hmacmd5_init(isc_hmacmd5_t *ctx, const unsigned char *key,
- unsigned int len)
- {
- unsigned char ipad[PADLEN];
- int i;
- memset(ctx->key, 0, sizeof(ctx->key));
- if (len > sizeof(ctx->key)) {
- isc_md5_t md5ctx;
- isc_md5_init(&md5ctx);
- isc_md5_update(&md5ctx, key, len);
- isc_md5_final(&md5ctx, ctx->key);
- } else
- memcpy(ctx->key, key, len);
- isc_md5_init(&ctx->md5ctx);
- memset(ipad, IPAD, sizeof(ipad));
- for (i = 0; i < PADLEN; i++)
- ipad[i] ^= ctx->key[i];
- isc_md5_update(&ctx->md5ctx, ipad, sizeof(ipad));
- }
- void
- isc_hmacmd5_invalidate(isc_hmacmd5_t *ctx) {
- isc_md5_invalidate(&ctx->md5ctx);
- memset(ctx->key, 0, sizeof(ctx->key));
- }
- /*!
- * Update context to reflect the concatenation of another buffer full
- * of bytes.
- */
- void
- isc_hmacmd5_update(isc_hmacmd5_t *ctx, const unsigned char *buf,
- unsigned int len)
- {
- isc_md5_update(&ctx->md5ctx, buf, len);
- }
- /*!
- * Compute signature - finalize MD5 operation and reapply MD5.
- */
- void
- isc_hmacmd5_sign(isc_hmacmd5_t *ctx, unsigned char *digest) {
- unsigned char opad[PADLEN];
- int i;
- isc_md5_final(&ctx->md5ctx, digest);
- memset(opad, OPAD, sizeof(opad));
- for (i = 0; i < PADLEN; i++)
- opad[i] ^= ctx->key[i];
- isc_md5_init(&ctx->md5ctx);
- isc_md5_update(&ctx->md5ctx, opad, sizeof(opad));
- isc_md5_update(&ctx->md5ctx, digest, ISC_MD5_DIGESTLENGTH);
- isc_md5_final(&ctx->md5ctx, digest);
- isc_hmacmd5_invalidate(ctx);
- }
- #endif /* !ISC_PLATFORM_OPENSSLHASH */
- /*!
- * Verify signature - finalize MD5 operation and reapply MD5, then
- * compare to the supplied digest.
- */
- isc_boolean_t
- isc_hmacmd5_verify(isc_hmacmd5_t *ctx, unsigned char *digest) {
- return (isc_hmacmd5_verify2(ctx, digest, ISC_MD5_DIGESTLENGTH));
- }
- isc_boolean_t
- isc_hmacmd5_verify2(isc_hmacmd5_t *ctx, unsigned char *digest, size_t len) {
- unsigned char newdigest[ISC_MD5_DIGESTLENGTH];
- REQUIRE(len <= ISC_MD5_DIGESTLENGTH);
- isc_hmacmd5_sign(ctx, newdigest);
- return (ISC_TF(memcmp(digest, newdigest, len) == 0));
- }