sl@0: /* crypto/evp/p_seal.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: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/rand.h>
sl@0: #ifndef OPENSSL_NO_RSA
sl@0: #include <openssl/rsa.h>
sl@0: #endif
sl@0: #include <openssl/evp.h>
sl@0: #include <openssl/objects.h>
sl@0: #include <openssl/x509.h>
sl@0: 
sl@0: EXPORT_C int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char **ek,
sl@0: 	     int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)
sl@0: 	{
sl@0: 	unsigned char key[EVP_MAX_KEY_LENGTH];
sl@0: 	int i;
sl@0: 	
sl@0: 	if(type) {
sl@0: 		EVP_CIPHER_CTX_init(ctx);
sl@0: 		if(!EVP_EncryptInit_ex(ctx,type,NULL,NULL,NULL)) return 0;
sl@0: 	}
sl@0: 	if ((npubk <= 0) || !pubk)
sl@0: 		return 1;
sl@0: 	if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
sl@0: 		return 0;
sl@0: 	if (EVP_CIPHER_CTX_iv_length(ctx))
sl@0: 		RAND_pseudo_bytes(iv,EVP_CIPHER_CTX_iv_length(ctx));
sl@0: 
sl@0: 	if(!EVP_EncryptInit_ex(ctx,NULL,NULL,key,iv)) return 0;
sl@0: 
sl@0: 	for (i=0; i<npubk; i++)
sl@0: 		{
sl@0: 		ekl[i]=EVP_PKEY_encrypt(ek[i],key,EVP_CIPHER_CTX_key_length(ctx),
sl@0: 			pubk[i]);
sl@0: 		if (ekl[i] <= 0) return(-1);
sl@0: 		}
sl@0: 	return(npubk);
sl@0: 	}
sl@0: 
sl@0: /* MACRO
sl@0: void EVP_SealUpdate(ctx,out,outl,in,inl)
sl@0: EVP_CIPHER_CTX *ctx;
sl@0: unsigned char *out;
sl@0: int *outl;
sl@0: unsigned char *in;
sl@0: int inl;
sl@0: 	{
sl@0: 	EVP_EncryptUpdate(ctx,out,outl,in,inl);
sl@0: 	}
sl@0: */
sl@0: 
sl@0: EXPORT_C int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	int i;
sl@0: 	i = EVP_EncryptFinal_ex(ctx,out,outl);
sl@0: 	EVP_EncryptInit_ex(ctx,NULL,NULL,NULL,NULL);
sl@0: 	return i;
sl@0: 	}