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377 lines
12 KiB
377 lines
12 KiB
/* crypto/evp/digest.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
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{
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memset(ctx,'\0',sizeof *ctx);
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}
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EVP_MD_CTX *EVP_MD_CTX_create(void)
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{
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EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
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if (ctx)
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EVP_MD_CTX_init(ctx);
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return ctx;
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}
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int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
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{
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EVP_MD_CTX_init(ctx);
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return EVP_DigestInit_ex(ctx, type, NULL);
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}
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int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
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{
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EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
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#ifndef OPENSSL_NO_ENGINE
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/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
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* so this context may already have an ENGINE! Try to avoid releasing
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* the previous handle, re-querying for an ENGINE, and having a
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* reinitialisation, when it may all be unecessary. */
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if (ctx->engine && ctx->digest && (!type ||
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(type && (type->type == ctx->digest->type))))
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goto skip_to_init;
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if (type)
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{
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/* Ensure an ENGINE left lying around from last time is cleared
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* (the previous check attempted to avoid this if the same
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* ENGINE and EVP_MD could be used). */
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if(ctx->engine)
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ENGINE_finish(ctx->engine);
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if(impl)
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{
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if (!ENGINE_init(impl))
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{
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EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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}
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else
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/* Ask if an ENGINE is reserved for this job */
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impl = ENGINE_get_digest_engine(type->type);
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if(impl)
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{
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/* There's an ENGINE for this job ... (apparently) */
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const EVP_MD *d = ENGINE_get_digest(impl, type->type);
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if(!d)
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{
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/* Same comment from evp_enc.c */
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EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
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ENGINE_finish(impl);
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return 0;
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}
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/* We'll use the ENGINE's private digest definition */
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type = d;
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/* Store the ENGINE functional reference so we know
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* 'type' came from an ENGINE and we need to release
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* it when done. */
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ctx->engine = impl;
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}
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else
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ctx->engine = NULL;
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}
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else
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if(!ctx->digest)
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{
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EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET);
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return 0;
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}
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#endif
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if (ctx->digest != type)
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{
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if (ctx->digest && ctx->digest->ctx_size)
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OPENSSL_free(ctx->md_data);
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ctx->digest=type;
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if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size)
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{
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ctx->update = type->update;
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ctx->md_data=OPENSSL_malloc(type->ctx_size);
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if (ctx->md_data == NULL)
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{
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EVPerr(EVP_F_EVP_DIGESTINIT_EX,
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ERR_R_MALLOC_FAILURE);
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return 0;
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}
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}
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}
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#ifndef OPENSSL_NO_ENGINE
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skip_to_init:
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#endif
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if (ctx->pctx)
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{
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int r;
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r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
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EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
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if (r <= 0 && (r != -2))
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return 0;
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}
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if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
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return 1;
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return ctx->digest->init(ctx);
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}
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int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
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{
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return ctx->update(ctx,data,count);
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}
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/* The caller can assume that this removes any secret data from the context */
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int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
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{
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int ret;
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ret = EVP_DigestFinal_ex(ctx, md, size);
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EVP_MD_CTX_cleanup(ctx);
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return ret;
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}
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/* The caller can assume that this removes any secret data from the context */
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int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
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{
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int ret;
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OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
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ret=ctx->digest->final(ctx,md);
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if (size != NULL)
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*size=ctx->digest->md_size;
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if (ctx->digest->cleanup)
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{
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ctx->digest->cleanup(ctx);
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EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
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}
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memset(ctx->md_data,0,ctx->digest->ctx_size);
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return ret;
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}
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int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
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{
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EVP_MD_CTX_init(out);
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return EVP_MD_CTX_copy_ex(out, in);
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}
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int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
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{
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unsigned char *tmp_buf;
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if ((in == NULL) || (in->digest == NULL))
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{
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EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);
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return 0;
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}
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#ifndef OPENSSL_NO_ENGINE
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/* Make sure it's safe to copy a digest context using an ENGINE */
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if (in->engine && !ENGINE_init(in->engine))
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{
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EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);
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return 0;
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}
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#endif
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if (out->digest == in->digest)
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{
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tmp_buf = out->md_data;
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EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
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}
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else tmp_buf = NULL;
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EVP_MD_CTX_cleanup(out);
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memcpy(out,in,sizeof *out);
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if (in->md_data && out->digest->ctx_size)
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{
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if (tmp_buf)
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out->md_data = tmp_buf;
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else
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{
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out->md_data=OPENSSL_malloc(out->digest->ctx_size);
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if (!out->md_data)
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{
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EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE);
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return 0;
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}
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}
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memcpy(out->md_data,in->md_data,out->digest->ctx_size);
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}
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out->update = in->update;
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if (in->pctx)
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{
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out->pctx = EVP_PKEY_CTX_dup(in->pctx);
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if (!out->pctx)
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{
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EVP_MD_CTX_cleanup(out);
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return 0;
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}
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}
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if (out->digest->copy)
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return out->digest->copy(out,in);
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return 1;
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}
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int EVP_Digest(const void *data, size_t count,
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unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
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{
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EVP_MD_CTX ctx;
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int ret;
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EVP_MD_CTX_init(&ctx);
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EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);
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ret=EVP_DigestInit_ex(&ctx, type, impl)
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&& EVP_DigestUpdate(&ctx, data, count)
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&& EVP_DigestFinal_ex(&ctx, md, size);
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EVP_MD_CTX_cleanup(&ctx);
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return ret;
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}
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void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
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{
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EVP_MD_CTX_cleanup(ctx);
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OPENSSL_free(ctx);
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}
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/* This call frees resources associated with the context */
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int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
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{
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/* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
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* because sometimes only copies of the context are ever finalised.
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*/
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if (ctx->digest && ctx->digest->cleanup
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&& !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
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ctx->digest->cleanup(ctx);
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if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
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&& !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
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{
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OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
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OPENSSL_free(ctx->md_data);
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}
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if (ctx->pctx)
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EVP_PKEY_CTX_free(ctx->pctx);
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#ifndef OPENSSL_NO_ENGINE
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if(ctx->engine)
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/* The EVP_MD we used belongs to an ENGINE, release the
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* functional reference we held for this reason. */
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ENGINE_finish(ctx->engine);
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#endif
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memset(ctx,'\0',sizeof *ctx);
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return 1;
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}
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