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      1 /* crypto/evp/p_seal.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 
     59 #include <stdio.h>
     60 #include "cryptlib.h"
     61 #include <openssl/rand.h>
     62 #ifndef OPENSSL_NO_RSA
     63 #include <openssl/rsa.h>
     64 #endif
     65 #include <openssl/evp.h>
     66 #include <openssl/objects.h>
     67 #include <openssl/x509.h>
     68 
     69 int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char **ek,
     70 	     int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)
     71 	{
     72 	unsigned char key[EVP_MAX_KEY_LENGTH];
     73 	int i;
     74 
     75 	if(type) {
     76 		EVP_CIPHER_CTX_init(ctx);
     77 		if(!EVP_EncryptInit_ex(ctx,type,NULL,NULL,NULL)) return 0;
     78 	}
     79 	if ((npubk <= 0) || !pubk)
     80 		return 1;
     81 	if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
     82 		return 0;
     83 	if (EVP_CIPHER_CTX_iv_length(ctx))
     84 		RAND_pseudo_bytes(iv,EVP_CIPHER_CTX_iv_length(ctx));
     85 
     86 	if(!EVP_EncryptInit_ex(ctx,NULL,NULL,key,iv)) return 0;
     87 
     88 	for (i=0; i<npubk; i++)
     89 		{
     90 		ekl[i]=EVP_PKEY_encrypt_old(ek[i],key,EVP_CIPHER_CTX_key_length(ctx),
     91 			pubk[i]);
     92 		if (ekl[i] <= 0) return(-1);
     93 		}
     94 	return(npubk);
     95 	}
     96 
     97 /* MACRO
     98 void EVP_SealUpdate(ctx,out,outl,in,inl)
     99 EVP_CIPHER_CTX *ctx;
    100 unsigned char *out;
    101 int *outl;
    102 unsigned char *in;
    103 int inl;
    104 	{
    105 	EVP_EncryptUpdate(ctx,out,outl,in,inl);
    106 	}
    107 */
    108 
    109 int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
    110 	{
    111 	int i;
    112 	i = EVP_EncryptFinal_ex(ctx,out,outl);
    113 	EVP_EncryptInit_ex(ctx,NULL,NULL,NULL,NULL);
    114 	return i;
    115 	}
    116