text: /* $OpenBSD: p_seal.c,v 1.13 2014/07/11 08:44:48 jsing Exp $ */
  /* 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 <stdlib.h>
  
  #include <openssl/opensslconf.h>
  
  #include <openssl/evp.h>
  #include <openssl/objects.h>
  #include <openssl/x509.h>
  
  #ifndef OPENSSL_NO_RSA
  #include <openssl/rsa.h>
  #endif
  
  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))
  		arc4random_buf(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_old(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);
  	}
  */
  
  int
  EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
  {
  	int i;
  
  	i = EVP_EncryptFinal_ex(ctx, out, outl);
  	if (i)
  		i = EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, NULL);
  	return i;
  }
  