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