/* crypto/evp/p_open.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.]

 */

#include <stdio.h>

#include "cryptlib.h"

#ifndef OPENSSL_NO_RSA

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#include <openssl/rsa.h>

EXPORT_C int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,

	const unsigned char *ek, int ekl, const unsigned char *iv,

	EVP_PKEY *priv)

	{

	unsigned char *key=NULL;

	int i,size=0,ret=0;

	if(type) {	

		EVP_CIPHER_CTX_init(ctx);

		if(!EVP_DecryptInit_ex(ctx,type,NULL, NULL,NULL)) return 0;

	}

	if(!priv) return 1;

	if (priv->type != EVP_PKEY_RSA)

		{

		EVPerr(EVP_F_EVP_OPENINIT,EVP_R_PUBLIC_KEY_NOT_RSA);

		goto err;

                }

	size=RSA_size(priv->pkey.rsa);

	key=(unsigned char *)OPENSSL_malloc(size+2);

	if (key == NULL)

		{

		/* ERROR */

		EVPerr(EVP_F_EVP_OPENINIT,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	i=EVP_PKEY_decrypt(key,ek,ekl,priv);

	if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i))

		{

		/* ERROR */

		goto err;

		}

	if(!EVP_DecryptInit_ex(ctx,NULL,NULL,key,iv)) goto err;

	ret=1;

err:

	if (key != NULL) OPENSSL_cleanse(key,size);

	OPENSSL_free(key);

	return(ret);

	}

EXPORT_C int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)

	{

	int i;

	i=EVP_DecryptFinal_ex(ctx,out,outl);

	EVP_DecryptInit_ex(ctx,NULL,NULL,NULL,NULL);

	return(i);

	}

#else /* !OPENSSL_NO_RSA */

# ifdef PEDANTIC

static void *dummy=&dummy;

# endif

#endif