/* crypto/evp/p_seal.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"

 #include <openssl/rand.h>

 #ifndef OPENSSL_NO_RSA

 #include <openssl/rsa.h>

 #endif

 #include <openssl/evp.h>

 #include <openssl/objects.h>

 #include <openssl/x509.h>

 EXPORT_C int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char **ek,

 	     int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)

 	{

 	unsigned char key[EVP_MAX_KEY_LENGTH];

 	int i;

 	if(type) {

 		EVP_CIPHER_CTX_init(ctx);

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

 	}

 	if ((npubk <= 0) || !pubk)

 		return 1;

 	if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)

 		return 0;

 	if (EVP_CIPHER_CTX_iv_length(ctx))

 		RAND_pseudo_bytes(iv,EVP_CIPHER_CTX_iv_length(ctx));

 	if(!EVP_EncryptInit_ex(ctx,NULL,NULL,key,iv)) return 0;

 	for (i=0; i<npubk; i++)

 		{

 		ekl[i]=EVP_PKEY_encrypt(ek[i],key,EVP_CIPHER_CTX_key_length(ctx),

 			pubk[i]);

 		if (ekl[i] <= 0) return(-1);

 		}

 	return(npubk);

 	}

 /* MACRO

 void EVP_SealUpdate(ctx,out,outl,in,inl)

 EVP_CIPHER_CTX *ctx;

 unsigned char *out;

 int *outl;

 unsigned char *in;

 int inl;

 	{

 	EVP_EncryptUpdate(ctx,out,outl,in,inl);

 	}

 */

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

 	{

 	int i;

 	i = EVP_EncryptFinal_ex(ctx,out,outl);

 	EVP_EncryptInit_ex(ctx,NULL,NULL,NULL,NULL);

 	return i;

 	}