crypto/evp/digest.c - third_party/openssl - Git at Google

 /* 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

 void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
 {
     memset(ctx, '\0', sizeof *ctx);
 }

 EVP_MD_CTX *EVP_MD_CTX_create(void)
 {
     EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof *ctx);

     if (ctx)
         EVP_MD_CTX_init(ctx);

     return ctx;
 }

 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
 {
     EVP_MD_CTX_init(ctx);
     return EVP_DigestInit_ex(ctx, type, NULL);
 }

 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);
                 ENGINE_finish(impl);
                 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)
             OPENSSL_free(ctx->md_data);
         ctx->digest = type;
         if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
             ctx->update = type->update;
             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
     if (ctx->pctx) {
         int r;
         r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
                               EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
         if (r <= 0 && (r != -2))
             return 0;
     }
     if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
         return 1;
     return ctx->digest->init(ctx);
 }

 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
 {
     return ctx->update(ctx, data, count);
 }

 /* The caller can assume that this removes any secret data from the context */
 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 */
 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);
     }
     memset(ctx->md_data, 0, ctx->digest->ctx_size);
     return ret;
 }

 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);
 }

 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 (in->md_data && 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) {
                 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);
     }

     out->update = in->update;

     if (in->pctx) {
         out->pctx = EVP_PKEY_CTX_dup(in->pctx);
         if (!out->pctx) {
             EVP_MD_CTX_cleanup(out);
             return 0;
         }
     }

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

     return 1;
 }

 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;
 }

 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
 {
     if (ctx) {
         EVP_MD_CTX_cleanup(ctx);
         OPENSSL_free(ctx);
     }
 }

 /* This call frees resources associated with the context */
 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);
     }
     if (ctx->pctx)
         EVP_PKEY_CTX_free(ctx->pctx);
 #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;
 }
	/* 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

	void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
	{
	memset(ctx, '\0', sizeof *ctx);
	}

	EVP_MD_CTX *EVP_MD_CTX_create(void)
	{
	EVP_MD_CTX ctx = OPENSSL_malloc(sizeof ctx);

	if (ctx)
	EVP_MD_CTX_init(ctx);

	return ctx;
	}

	int EVP_DigestInit(EVP_MD_CTX ctx, const EVP_MD type)
	{
	EVP_MD_CTX_init(ctx);
	return EVP_DigestInit_ex(ctx, type, NULL);
	}

	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);
	ENGINE_finish(impl);
	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)
	OPENSSL_free(ctx->md_data);
	ctx->digest = type;
	if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
	ctx->update = type->update;
	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
	if (ctx->pctx) {
	int r;
	r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
	EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
	if (r <= 0 && (r != -2))
	return 0;
	}
	if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
	return 1;
	return ctx->digest->init(ctx);
	}

	int EVP_DigestUpdate(EVP_MD_CTX ctx, const void data, size_t count)
	{
	return ctx->update(ctx, data, count);
	}

	/* The caller can assume that this removes any secret data from the context */
	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 */
	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);
	}
	memset(ctx->md_data, 0, ctx->digest->ctx_size);
	return ret;
	}

	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);
	}

	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 (in->md_data && 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) {
	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);
	}

	out->update = in->update;

	if (in->pctx) {
	out->pctx = EVP_PKEY_CTX_dup(in->pctx);
	if (!out->pctx) {
	EVP_MD_CTX_cleanup(out);
	return 0;
	}
	}

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

	return 1;
	}

	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;
	}

	void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
	{
	if (ctx) {
	EVP_MD_CTX_cleanup(ctx);
	OPENSSL_free(ctx);
	}
	}

	/* This call frees resources associated with the context */
	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);
	}
	if (ctx->pctx)
	EVP_PKEY_CTX_free(ctx->pctx);
	#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;
	}