/* crypto/evp/digest.c */

 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

  * All rights reserved.

  *

  * This package is an SSL implementation written

  * by Eric Young (eay@cryptsoft.com).

  * The implementation was written so as to conform with Netscapes SSL.

  * 

  * This library is free for commercial and non-commercial use as long as

  * the following conditions are aheared to.  The following conditions

  * apply to all code found in this distribution, be it the RC4, RSA,

  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

  * included with this distribution is covered by the same copyright terms

  * except that the holder is Tim Hudson (tjh@cryptsoft.com).

  * 

  * Copyright remains Eric Young's, and as such any Copyright notices in

  * the code are not to be removed.

  * If this package is used in a product, Eric Young should be given attribution

  * as the author of the parts of the library used.

  * This can be in the form of a textual message at program startup or

  * in documentation (online or textual) provided with the package.

  * 

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 1. Redistributions of source code must retain the copyright

  *    notice, this list of conditions and the following disclaimer.

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in the

  *    documentation and/or other materials provided with the distribution.

  * 3. All advertising materials mentioning features or use of this software

  *    must display the following acknowledgement:

  *    "This product includes cryptographic software written by

  *     Eric Young (eay@cryptsoft.com)"

  *    The word 'cryptographic' can be left out if the rouines from the library

  *    being used are not cryptographic related :-).

  * 4. If you include any Windows specific code (or a derivative thereof) from 

  *    the apps directory (application code) you must include an acknowledgement:

  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

  * 

  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  * SUCH DAMAGE.

  * 

  * The licence and distribution terms for any publically available version or

  * derivative of this code cannot be changed.  i.e. this code cannot simply be

  * copied and put under another distribution licence

  * [including the GNU Public Licence.]

  */

 /* ====================================================================

  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  * 1. Redistributions of source code must retain the above copyright

  *    notice, this list of conditions and the following disclaimer. 

  *

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in

  *    the documentation and/or other materials provided with the

  *    distribution.

  *

  * 3. All advertising materials mentioning features or use of this

  *    software must display the following acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

  *

  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

  *    endorse or promote products derived from this software without

  *    prior written permission. For written permission, please contact

  *    openssl-core@openssl.org.

  *

  * 5. Products derived from this software may not be called "OpenSSL"

  *    nor may "OpenSSL" appear in their names without prior written

  *    permission of the OpenSSL Project.

  *

  * 6. Redistributions of any form whatsoever must retain the following

  *    acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

  *

  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  * ====================================================================

  *

  * This product includes cryptographic software written by Eric Young

  * (eay@cryptsoft.com).  This product includes software written by Tim

  * Hudson (tjh@cryptsoft.com).

  *

  */

 #include <stdio.h>

 #include "cryptlib.h"

 #include <openssl/objects.h>

 #include <openssl/evp.h>

 #ifndef OPENSSL_NO_ENGINE

 #include <openssl/engine.h>

 #endif

 EXPORT_C void EVP_MD_CTX_init(EVP_MD_CTX *ctx)

 	{

 	memset(ctx,'\0',sizeof *ctx);

 	}

 EXPORT_C EVP_MD_CTX *EVP_MD_CTX_create(void)

 	{

 	EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);

     if(ctx==NULL)

 	{

 	   return ctx;

 	}

 	EVP_MD_CTX_init(ctx);

 	return ctx;

 	}

 EXPORT_C int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)

 	{

 	EVP_MD_CTX_init(ctx);

 	return EVP_DigestInit_ex(ctx, type, NULL);

 	}

 EXPORT_C int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)

 	{

 	EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);

 #ifndef OPENSSL_NO_ENGINE

 	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts

 	 * so this context may already have an ENGINE! Try to avoid releasing

 	 * the previous handle, re-querying for an ENGINE, and having a

 	 * reinitialisation, when it may all be unecessary. */

 	if (ctx->engine && ctx->digest && (!type ||

 			(type && (type->type == ctx->digest->type))))

 		goto skip_to_init;

 	if (type)

 		{

 		/* Ensure an ENGINE left lying around from last time is cleared

 		 * (the previous check attempted to avoid this if the same

 		 * ENGINE and EVP_MD could be used). */

 		if(ctx->engine)

 			ENGINE_finish(ctx->engine);

 		if(impl)

 			{

 			if (!ENGINE_init(impl))

 				{

 				EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);

 				return 0;

 				}

 			}

 		else

 			/* Ask if an ENGINE is reserved for this job */

 			impl = ENGINE_get_digest_engine(type->type);

 		if(impl)

 			{

 			/* There's an ENGINE for this job ... (apparently) */

 			const EVP_MD *d = ENGINE_get_digest(impl, type->type);

 			if(!d)

 				{

 				/* Same comment from evp_enc.c */

 				EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);

 				return 0;

 				}

 			/* We'll use the ENGINE's private digest definition */

 			type = d;

 			/* Store the ENGINE functional reference so we know

 			 * 'type' came from an ENGINE and we need to release

 			 * it when done. */

 			ctx->engine = impl;

 			}

 		else

 			ctx->engine = NULL;

 		}

 	else

 	if(!ctx->digest)

 		{

 		EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET);

 		return 0;

 		}

 #endif

 	if (ctx->digest != type)

 		{

 		if (ctx->digest && ctx->digest->ctx_size)

 		  { if(ctx->md_data)

 			  OPENSSL_free(ctx->md_data);

 		  }

 		ctx->digest=type;

 		if (type->ctx_size)

 		{

 			ctx->md_data=OPENSSL_malloc(type->ctx_size);

 			if(ctx->md_data==NULL)

 			{

 			    EVPerr(EVP_F_EVP_DIGESTINIT_EX,ERR_R_MALLOC_FAILURE);

 			    return 0;

 			}

 		}

 		}

 #ifndef OPENSSL_NO_ENGINE

 skip_to_init:

 #endif

 	return ctx->digest->init(ctx);

 	}

 EXPORT_C int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data,

 	     size_t count)

 	{

 	return ctx->digest->update(ctx,data,count);

 	}

 /* The caller can assume that this removes any secret data from the context */

 EXPORT_C int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)

 	{

 	int ret;

 	ret = EVP_DigestFinal_ex(ctx, md, size);

 	EVP_MD_CTX_cleanup(ctx);

 	return ret;

 	}

 /* The caller can assume that this removes any secret data from the context */

 EXPORT_C int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)

 	{

 	int ret;

 	OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);

 	ret=ctx->digest->final(ctx,md);

 	if (size != NULL)

 		*size=ctx->digest->md_size;

 	if (ctx->digest->cleanup)

 		{

 		ctx->digest->cleanup(ctx);

 		EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);

 		}

 	if(ctx->md_data)	

 	memset(ctx->md_data,0,ctx->digest->ctx_size);

 	return ret;

 	}

 EXPORT_C int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)

 	{

 	EVP_MD_CTX_init(out);

 	return EVP_MD_CTX_copy_ex(out, in);

 	}

 EXPORT_C int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)

 	{

 	unsigned char *tmp_buf;

 	if ((in == NULL) || (in->digest == NULL))

 		{

 		EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);

 		return 0;

 		}

 #ifndef OPENSSL_NO_ENGINE

 	/* Make sure it's safe to copy a digest context using an ENGINE */

 	if (in->engine && !ENGINE_init(in->engine))

 		{

 		EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);

 		return 0;

 		}

 #endif

 	if (out->digest == in->digest)

 		{

 		tmp_buf = out->md_data;

 	    	EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);

 		}

 	else tmp_buf = NULL;

 	EVP_MD_CTX_cleanup(out);

 	memcpy(out,in,sizeof *out);

 	if (out->digest->ctx_size)

 		{

 		 if (tmp_buf) out->md_data = tmp_buf;

 		 else out->md_data=OPENSSL_malloc(out->digest->ctx_size);

      if(out->md_data==NULL||in->md_data==NULL)

         {

            EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE);

 		       return 0;

         } 

      memcpy(out->md_data,in->md_data,out->digest->ctx_size);

 		}

 	if (out->digest->copy)

 		return out->digest->copy(out,in);

 	return 1;

 	}

 EXPORT_C int EVP_Digest(const void *data, size_t count,

 		unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)

 	{

 	EVP_MD_CTX ctx;

 	int ret;

 	EVP_MD_CTX_init(&ctx);

 	EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);

 	ret=EVP_DigestInit_ex(&ctx, type, impl)

 	  && EVP_DigestUpdate(&ctx, data, count)

 	  && EVP_DigestFinal_ex(&ctx, md, size);

 	EVP_MD_CTX_cleanup(&ctx);

 	return ret;

 	}

 EXPORT_C void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)

 	{

 	EVP_MD_CTX_cleanup(ctx);

 	OPENSSL_free(ctx);

 	}

 /* This call frees resources associated with the context */

 EXPORT_C int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)

 	{

 	/* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,

 	 * because sometimes only copies of the context are ever finalised.

 	 */

 	if (ctx->digest && ctx->digest->cleanup

 	    && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))

 		ctx->digest->cleanup(ctx);

 	if (ctx->digest && ctx->digest->ctx_size && ctx->md_data

 	    && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))

 		{

 		OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);

 		OPENSSL_free(ctx->md_data);

 		}

 #ifndef OPENSSL_NO_ENGINE

 	if(ctx->engine)

 		/* The EVP_MD we used belongs to an ENGINE, release the

 		 * functional reference we held for this reason. */

 		ENGINE_finish(ctx->engine);

 #endif

 	memset(ctx,'\0',sizeof *ctx);

 	return 1;

 	}