text: /* smime.c */
  /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   * project.
   */
  /* ====================================================================
   * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
   *
   * 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 above 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 acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED 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 OpenSSL PROJECT OR
   * ITS 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.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  /* S/MIME utility function */
  
  #include <stdio.h>
  #include <string.h>
  #include "apps.h"
  #include <openssl/crypto.h>
  #include <openssl/pem.h>
  #include <openssl/err.h>
  #include <openssl/x509_vfy.h>
  #include <openssl/x509v3.h>
  
  #undef PROG
  #define PROG smime_main
  static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  static int smime_cb(int ok, X509_STORE_CTX *ctx);
  
  #define SMIME_OP	0x10
  #define SMIME_IP	0x20
  #define SMIME_SIGNERS	0x40
  #define SMIME_ENCRYPT	(1 | SMIME_OP)
  #define SMIME_DECRYPT	(2 | SMIME_IP)
  #define SMIME_SIGN	(3 | SMIME_OP | SMIME_SIGNERS)
  #define SMIME_VERIFY	(4 | SMIME_IP)
  #define SMIME_PK7OUT	(5 | SMIME_IP | SMIME_OP)
  #define SMIME_RESIGN	(6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  
  int MAIN(int, char **);
  
  int MAIN(int argc, char **argv)
  	{
  	ENGINE *e = NULL;
  	int operation = 0;
  	int ret = 0;
  	char **args;
  	const char *inmode = "r", *outmode = "w";
  	char *infile = NULL, *outfile = NULL;
  	char *signerfile = NULL, *recipfile = NULL;
  	STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
  	char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
  	const EVP_CIPHER *cipher = NULL;
  	PKCS7 *p7 = NULL;
  	X509_STORE *store = NULL;
  	X509 *cert = NULL, *recip = NULL, *signer = NULL;
  	EVP_PKEY *key = NULL;
  	STACK_OF(X509) *encerts = NULL, *other = NULL;
  	BIO *in = NULL, *out = NULL, *indata = NULL;
  	int badarg = 0;
  	int flags = PKCS7_DETACHED;
  	char *to = NULL, *from = NULL, *subject = NULL;
  	char *CAfile = NULL, *CApath = NULL;
  	char *passargin = NULL, *passin = NULL;
  	char *inrand = NULL;
  	int need_rand = 0;
  	int indef = 0;
  	const EVP_MD *sign_md = NULL;
  	int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
          int keyform = FORMAT_PEM;
  #ifndef OPENSSL_NO_ENGINE
  	char *engine=NULL;
  #endif
  
  	X509_VERIFY_PARAM *vpm = NULL;
  
  	args = argv + 1;
  	ret = 1;
  
  	apps_startup();
  
  	if (bio_err == NULL)
  		{
  		if ((bio_err = BIO_new(BIO_s_file())) != NULL)
  			BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
  		}
  
  	if (!load_config(bio_err, NULL))
  		goto end;
  
  	while (!badarg && *args && *args[0] == '-')
  		{
  		if (!strcmp (*args, "-encrypt"))
  			operation = SMIME_ENCRYPT;
  		else if (!strcmp (*args, "-decrypt"))
  			operation = SMIME_DECRYPT;
  		else if (!strcmp (*args, "-sign"))
  			operation = SMIME_SIGN;
  		else if (!strcmp (*args, "-resign"))
  			operation = SMIME_RESIGN;
  		else if (!strcmp (*args, "-verify"))
  			operation = SMIME_VERIFY;
  		else if (!strcmp (*args, "-pk7out"))
  			operation = SMIME_PK7OUT;
  #ifndef OPENSSL_NO_DES
  		else if (!strcmp (*args, "-des3")) 
  				cipher = EVP_des_ede3_cbc();
  		else if (!strcmp (*args, "-des")) 
  				cipher = EVP_des_cbc();
  #endif
  #ifndef OPENSSL_NO_SEED
  		else if (!strcmp (*args, "-seed")) 
  				cipher = EVP_seed_cbc();
  #endif
  #ifndef OPENSSL_NO_RC2
  		else if (!strcmp (*args, "-rc2-40")) 
  				cipher = EVP_rc2_40_cbc();
  		else if (!strcmp (*args, "-rc2-128")) 
  				cipher = EVP_rc2_cbc();
  		else if (!strcmp (*args, "-rc2-64")) 
  				cipher = EVP_rc2_64_cbc();
  #endif
  #ifndef OPENSSL_NO_AES
  		else if (!strcmp(*args,"-aes128"))
  				cipher = EVP_aes_128_cbc();
  		else if (!strcmp(*args,"-aes192"))
  				cipher = EVP_aes_192_cbc();
  		else if (!strcmp(*args,"-aes256"))
  				cipher = EVP_aes_256_cbc();
  #endif
  #ifndef OPENSSL_NO_CAMELLIA
  		else if (!strcmp(*args,"-camellia128"))
  				cipher = EVP_camellia_128_cbc();
  		else if (!strcmp(*args,"-camellia192"))
  				cipher = EVP_camellia_192_cbc();
  		else if (!strcmp(*args,"-camellia256"))
  				cipher = EVP_camellia_256_cbc();
  #endif
  		else if (!strcmp (*args, "-text")) 
  				flags |= PKCS7_TEXT;
  		else if (!strcmp (*args, "-nointern")) 
  				flags |= PKCS7_NOINTERN;
  		else if (!strcmp (*args, "-noverify")) 
  				flags |= PKCS7_NOVERIFY;
  		else if (!strcmp (*args, "-nochain")) 
  				flags |= PKCS7_NOCHAIN;
  		else if (!strcmp (*args, "-nocerts")) 
  				flags |= PKCS7_NOCERTS;
  		else if (!strcmp (*args, "-noattr")) 
  				flags |= PKCS7_NOATTR;
  		else if (!strcmp (*args, "-nodetach")) 
  				flags &= ~PKCS7_DETACHED;
  		else if (!strcmp (*args, "-nosmimecap"))
  				flags |= PKCS7_NOSMIMECAP;
  		else if (!strcmp (*args, "-binary"))
  				flags |= PKCS7_BINARY;
  		else if (!strcmp (*args, "-nosigs"))
  				flags |= PKCS7_NOSIGS;
  		else if (!strcmp (*args, "-stream"))
  				indef = 1;
  		else if (!strcmp (*args, "-indef"))
  				indef = 1;
  		else if (!strcmp (*args, "-noindef"))
  				indef = 0;
  		else if (!strcmp (*args, "-nooldmime"))
  				flags |= PKCS7_NOOLDMIMETYPE;
  		else if (!strcmp (*args, "-crlfeol"))
  				flags |= PKCS7_CRLFEOL;
  		else if (!strcmp(*args,"-rand"))
  			{
  			if (!args[1])
  				goto argerr;
  			args++;
  			inrand = *args;
  			need_rand = 1;
  			}
  #ifndef OPENSSL_NO_ENGINE
  		else if (!strcmp(*args,"-engine"))
  			{
  			if (!args[1])
  				goto argerr;
  			engine = *++args;
  			}
  #endif
  		else if (!strcmp(*args,"-passin"))
  			{
  			if (!args[1])
  				goto argerr;
  			passargin = *++args;
  			}
  		else if (!strcmp (*args, "-to"))
  			{
  			if (!args[1])
  				goto argerr;
  			to = *++args;
  			}
  		else if (!strcmp (*args, "-from"))
  			{
  			if (!args[1])
  				goto argerr;
  			from = *++args;
  			}
  		else if (!strcmp (*args, "-subject"))
  			{
  			if (!args[1])
  				goto argerr;
  			subject = *++args;
  			}
  		else if (!strcmp (*args, "-signer"))
  			{
  			if (!args[1])
  				goto argerr;
  			/* If previous -signer argument add signer to list */
  
  			if (signerfile)
  				{
  				if (!sksigners)
  					sksigners = sk_OPENSSL_STRING_new_null();
  				sk_OPENSSL_STRING_push(sksigners, signerfile);
  				if (!keyfile)
  					keyfile = signerfile;
  				if (!skkeys)
  					skkeys = sk_OPENSSL_STRING_new_null();
  				sk_OPENSSL_STRING_push(skkeys, keyfile);
  				keyfile = NULL;
  				}
  			signerfile = *++args;
  			}
  		else if (!strcmp (*args, "-recip"))
  			{
  			if (!args[1])
  				goto argerr;
  			recipfile = *++args;
  			}
  		else if (!strcmp (*args, "-md"))
  			{
  			if (!args[1])
  				goto argerr;
  			sign_md = EVP_get_digestbyname(*++args);
  			if (sign_md == NULL)
  				{
  				BIO_printf(bio_err, "Unknown digest %s\n",
  							*args);
  				goto argerr;
  				}
  			}
  		else if (!strcmp (*args, "-inkey"))
  			{
  			if (!args[1])	
  				goto argerr;
  			/* If previous -inkey arument add signer to list */
  			if (keyfile)
  				{
  				if (!signerfile)
  					{
  					BIO_puts(bio_err, "Illegal -inkey without -signer\n");
  					goto argerr;
  					}
  				if (!sksigners)
  					sksigners = sk_OPENSSL_STRING_new_null();
  				sk_OPENSSL_STRING_push(sksigners, signerfile);
  				signerfile = NULL;
  				if (!skkeys)
  					skkeys = sk_OPENSSL_STRING_new_null();
  				sk_OPENSSL_STRING_push(skkeys, keyfile);
  				}
  			keyfile = *++args;
  			}
  		else if (!strcmp (*args, "-keyform"))
  			{
  			if (!args[1])
  				goto argerr;
  			keyform = str2fmt(*++args);
  			}
  		else if (!strcmp (*args, "-certfile"))
  			{
  			if (!args[1])
  				goto argerr;
  			certfile = *++args;
  			}
  		else if (!strcmp (*args, "-CAfile"))
  			{
  			if (!args[1])
  				goto argerr;
  			CAfile = *++args;
  			}
  		else if (!strcmp (*args, "-CApath"))
  			{
  			if (!args[1])
  				goto argerr;
  			CApath = *++args;
  			}
  		else if (!strcmp (*args, "-in"))
  			{
  			if (!args[1])
  				goto argerr;
  			infile = *++args;
  			}
  		else if (!strcmp (*args, "-inform"))
  			{
  			if (!args[1])
  				goto argerr;
  			informat = str2fmt(*++args);
  			}
  		else if (!strcmp (*args, "-outform"))
  			{
  			if (!args[1])
  				goto argerr;
  			outformat = str2fmt(*++args);
  			}
  		else if (!strcmp (*args, "-out"))
  			{
  			if (!args[1])
  				goto argerr;
  			outfile = *++args;
  			}
  		else if (!strcmp (*args, "-content"))
  			{
  			if (!args[1])
  				goto argerr;
  			contfile = *++args;
  			}
  		else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
  			continue;
  		else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
  			badarg = 1;
  		args++;
  		}
  
  	if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners))
  		{
  		BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
  		goto argerr;
  		}
  
  	if (operation & SMIME_SIGNERS)
  		{
  		/* Check to see if any final signer needs to be appended */
  		if (keyfile && !signerfile)
  			{
  			BIO_puts(bio_err, "Illegal -inkey without -signer\n");
  			goto argerr;
  			}
  		if (signerfile)
  			{
  			if (!sksigners)
  				sksigners = sk_OPENSSL_STRING_new_null();
  			sk_OPENSSL_STRING_push(sksigners, signerfile);
  			if (!skkeys)
  				skkeys = sk_OPENSSL_STRING_new_null();
  			if (!keyfile)
  				keyfile = signerfile;
  			sk_OPENSSL_STRING_push(skkeys, keyfile);
  			}
  		if (!sksigners)
  			{
  			BIO_printf(bio_err, "No signer certificate specified\n");
  			badarg = 1;
  			}
  		signerfile = NULL;
  		keyfile = NULL;
  		need_rand = 1;
  		}
  	else if (operation == SMIME_DECRYPT)
  		{
  		if (!recipfile && !keyfile)
  			{
  			BIO_printf(bio_err, "No recipient certificate or key specified\n");
  			badarg = 1;
  			}
  		}
  	else if (operation == SMIME_ENCRYPT)
  		{
  		if (!*args)
  			{
  			BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
  			badarg = 1;
  			}
  		need_rand = 1;
  		}
  	else if (!operation)
  		badarg = 1;
  
  	if (badarg)
  		{
  		argerr:
  		BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
  		BIO_printf (bio_err, "where options are\n");
  		BIO_printf (bio_err, "-encrypt       encrypt message\n");
  		BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
  		BIO_printf (bio_err, "-sign          sign message\n");
  		BIO_printf (bio_err, "-verify        verify signed message\n");
  		BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
  #ifndef OPENSSL_NO_DES
  		BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
  		BIO_printf (bio_err, "-des           encrypt with DES\n");
  #endif
  #ifndef OPENSSL_NO_SEED
  		BIO_printf (bio_err, "-seed          encrypt with SEED\n");
  #endif
  #ifndef OPENSSL_NO_RC2
  		BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
  		BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
  		BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
  #endif
  #ifndef OPENSSL_NO_AES
  		BIO_printf (bio_err, "-aes128, -aes192, -aes256\n");
  		BIO_printf (bio_err, "               encrypt PEM output with cbc aes\n");
  #endif
  #ifndef OPENSSL_NO_CAMELLIA
  		BIO_printf (bio_err, "-camellia128, -camellia192, -camellia256\n");
  		BIO_printf (bio_err, "               encrypt PEM output with cbc camellia\n");
  #endif
  		BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
  		BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
  		BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
  		BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
  		BIO_printf (bio_err, "-nodetach      use opaque signing\n");
  		BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
  		BIO_printf (bio_err, "-binary        don't translate message to text\n");
  		BIO_printf (bio_err, "-certfile file other certificates file\n");
  		BIO_printf (bio_err, "-signer file   signer certificate file\n");
  		BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
  		BIO_printf (bio_err, "-in file       input file\n");
  		BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
  		BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
  		BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
  		BIO_printf (bio_err, "-out file      output file\n");
  		BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
  		BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
  		BIO_printf (bio_err, "-to addr       to address\n");
  		BIO_printf (bio_err, "-from ad       from address\n");
  		BIO_printf (bio_err, "-subject s     subject\n");
  		BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
  		BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
  		BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
  		BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
  		BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
  #ifndef OPENSSL_NO_ENGINE
  		BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
  #endif
  		BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
  		BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
  		BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
  		BIO_printf(bio_err,  "               the random number generator\n");
  		BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
  		goto end;
  		}
  
  #ifndef OPENSSL_NO_ENGINE
          e = setup_engine(bio_err, engine, 0);
  #endif
  
  	if (!app_passwd(bio_err, passargin, NULL, &passin, NULL))
  		{
  		BIO_printf(bio_err, "Error getting password\n");
  		goto end;
  		}
  
  	if (need_rand)
  		{
  		app_RAND_load_file(NULL, bio_err, (inrand != NULL));
  		if (inrand != NULL)
  			BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
  				app_RAND_load_files(inrand));
  		}
  
  	ret = 2;
  
  	if (!(operation & SMIME_SIGNERS))
  		flags &= ~PKCS7_DETACHED;
  
  	if (operation & SMIME_OP)
  		{
  		if (outformat == FORMAT_ASN1)
  			outmode = "wb";
  		}
  	else
  		{
  		if (flags & PKCS7_BINARY)
  			outmode = "wb";
  		}
  
  	if (operation & SMIME_IP)
  		{
  		if (informat == FORMAT_ASN1)
  			inmode = "rb";
  		}
  	else
  		{
  		if (flags & PKCS7_BINARY)
  			inmode = "rb";
  		}
  
  	if (operation == SMIME_ENCRYPT)
  		{
  		if (!cipher)
  			{
  #ifndef OPENSSL_NO_DES			
  			cipher = EVP_des_ede3_cbc();
  #else
  			BIO_printf(bio_err, "No cipher selected\n");
  			goto end;
  #endif
  			}
  		encerts = sk_X509_new_null();
  		while (*args)
  			{
  			if (!(cert = load_cert(bio_err,*args,FORMAT_PEM,
  				NULL, e, "recipient certificate file")))
  				{
  #if 0				/* An appropriate message is already printed */
  				BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
  #endif
  				goto end;
  				}
  			sk_X509_push(encerts, cert);
  			cert = NULL;
  			args++;
  			}
  		}
  
  	if (certfile)
  		{
  		if (!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
  			e, "certificate file")))
  			{
  			ERR_print_errors(bio_err);
  			goto end;
  			}
  		}
  
  	if (recipfile && (operation == SMIME_DECRYPT))
  		{
  		if (!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
  			e, "recipient certificate file")))
  			{
  			ERR_print_errors(bio_err);
  			goto end;
  			}
  		}
  
  	if (operation == SMIME_DECRYPT)
  		{
  		if (!keyfile)
  			keyfile = recipfile;
  		}
  	else if (operation == SMIME_SIGN)
  		{
  		if (!keyfile)
  			keyfile = signerfile;
  		}
  	else keyfile = NULL;
  
  	if (keyfile)
  		{
  		key = load_key(bio_err, keyfile, keyform, 0, passin, e,
  			       "signing key file");
  		if (!key)
  			goto end;
  		}
  
  	if (infile)
  		{
  		if (!(in = BIO_new_file(infile, inmode)))
  			{
  			BIO_printf (bio_err,
  				 "Can't open input file %s\n", infile);
  			goto end;
  			}
  		}
  	else
  		in = BIO_new_fp(stdin, BIO_NOCLOSE);
  
  	if (operation & SMIME_IP)
  		{
  		if (informat == FORMAT_SMIME) 
  			p7 = SMIME_read_PKCS7(in, &indata);
  		else if (informat == FORMAT_PEM) 
  			p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
  		else if (informat == FORMAT_ASN1) 
  			p7 = d2i_PKCS7_bio(in, NULL);
  		else
  			{
  			BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
  			goto end;
  			}
  
  		if (!p7)
  			{
  			BIO_printf(bio_err, "Error reading S/MIME message\n");
  			goto end;
  			}
  		if (contfile)
  			{
  			BIO_free(indata);
  			if (!(indata = BIO_new_file(contfile, "rb")))
  				{
  				BIO_printf(bio_err, "Can't read content file %s\n", contfile);
  				goto end;
  				}
  			}
  		}
  
  	if (outfile)
  		{
  		if (!(out = BIO_new_file(outfile, outmode)))
  			{
  			BIO_printf (bio_err,
  				 "Can't open output file %s\n", outfile);
  			goto end;
  			}
  		}
  	else
  		{
  		out = BIO_new_fp(stdout, BIO_NOCLOSE);
  #ifdef OPENSSL_SYS_VMS
  		{
  		    BIO *tmpbio = BIO_new(BIO_f_linebuffer());
  		    out = BIO_push(tmpbio, out);
  		}
  #endif
  		}
  
  	if (operation == SMIME_VERIFY)
  		{
  		if (!(store = setup_verify(bio_err, CAfile, CApath)))
  			goto end;
  		X509_STORE_set_verify_cb(store, smime_cb);
  		if (vpm)
  			X509_STORE_set1_param(store, vpm);
  		}
  
  
  	ret = 3;
  
  	if (operation == SMIME_ENCRYPT)
  		{
  		if (indef)
  			flags |= PKCS7_STREAM;
  		p7 = PKCS7_encrypt(encerts, in, cipher, flags);
  		}
  	else if (operation & SMIME_SIGNERS)
  		{
  		int i;
  		/* If detached data content we only enable streaming if
  		 * S/MIME output format.
  		 */
  		if (operation == SMIME_SIGN)
  			{
  			if (flags & PKCS7_DETACHED)
  				{
  				if (outformat == FORMAT_SMIME)
  					flags |= PKCS7_STREAM;
  				}
  			else if (indef)
  				flags |= PKCS7_STREAM;
  			flags |= PKCS7_PARTIAL;
  			p7 = PKCS7_sign(NULL, NULL, other, in, flags);
  			if (!p7)
  				goto end;
  			}
  		else
  			flags |= PKCS7_REUSE_DIGEST;
  		for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++)
  			{
  			signerfile = sk_OPENSSL_STRING_value(sksigners, i);
  			keyfile = sk_OPENSSL_STRING_value(skkeys, i);
  			signer = load_cert(bio_err, signerfile,FORMAT_PEM, NULL,
  					e, "signer certificate");
  			if (!signer)
  				goto end;
  			key = load_key(bio_err, keyfile, keyform, 0, passin, e,
  			       "signing key file");
  			if (!key)
  				goto end;
  			if (!PKCS7_sign_add_signer(p7, signer, key,
  						sign_md, flags))
  				goto end;
  			X509_free(signer);
  			signer = NULL;
  			EVP_PKEY_free(key);
  			key = NULL;
  			}
  		/* If not streaming or resigning finalize structure */
  		if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM))
  			{
  			if (!PKCS7_final(p7, in, flags))
  				goto end;
  			}
  		}
  
  	if (!p7)
  		{
  		BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
  		goto end;
  		}
  
  	ret = 4;
  	if (operation == SMIME_DECRYPT)
  		{
  		if (!PKCS7_decrypt(p7, key, recip, out, flags))
  			{
  			BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
  			goto end;
  			}
  		}
  	else if (operation == SMIME_VERIFY)
  		{
  		STACK_OF(X509) *signers;
  		if (PKCS7_verify(p7, other, store, indata, out, flags))
  			BIO_printf(bio_err, "Verification successful\n");
  		else
  			{
  			BIO_printf(bio_err, "Verification failure\n");
  			goto end;
  			}
  		signers = PKCS7_get0_signers(p7, other, flags);
  		if (!save_certs(signerfile, signers))
  			{
  			BIO_printf(bio_err, "Error writing signers to %s\n",
  								signerfile);
  			ret = 5;
  			goto end;
  			}
  		sk_X509_free(signers);
  		}
  	else if (operation == SMIME_PK7OUT)
  		PEM_write_bio_PKCS7(out, p7);
  	else
  		{
  		if (to)
  			BIO_printf(out, "To: %s\n", to);
  		if (from)
  			BIO_printf(out, "From: %s\n", from);
  		if (subject)
  			BIO_printf(out, "Subject: %s\n", subject);
  		if (outformat == FORMAT_SMIME) 
  			{
  			if (operation == SMIME_RESIGN)
  				SMIME_write_PKCS7(out, p7, indata, flags);
  			else
  				SMIME_write_PKCS7(out, p7, in, flags);
  			}
  		else if (outformat == FORMAT_PEM) 
  			PEM_write_bio_PKCS7_stream(out, p7, in, flags);
  		else if (outformat == FORMAT_ASN1) 
  			i2d_PKCS7_bio_stream(out,p7, in, flags);
  		else
  			{
  			BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
  			goto end;
  			}
  		}
  	ret = 0;
  end:
  	if (need_rand)
  		app_RAND_write_file(NULL, bio_err);
  	if (ret) ERR_print_errors(bio_err);
  	sk_X509_pop_free(encerts, X509_free);
  	sk_X509_pop_free(other, X509_free);
  	if (vpm)
  		X509_VERIFY_PARAM_free(vpm);
  	if (sksigners)
  		sk_OPENSSL_STRING_free(sksigners);
  	if (skkeys)
  		sk_OPENSSL_STRING_free(skkeys);
  	X509_STORE_free(store);
  	X509_free(cert);
  	X509_free(recip);
  	X509_free(signer);
  	EVP_PKEY_free(key);
  	PKCS7_free(p7);
  	BIO_free(in);
  	BIO_free(indata);
  	BIO_free_all(out);
  	if (passin) OPENSSL_free(passin);
  	return (ret);
  }
  
  static int save_certs(char *signerfile, STACK_OF(X509) *signers)
  	{
  	int i;
  	BIO *tmp;
  	if (!signerfile)
  		return 1;
  	tmp = BIO_new_file(signerfile, "w");
  	if (!tmp) return 0;
  	for(i = 0; i < sk_X509_num(signers); i++)
  		PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
  	BIO_free(tmp);
  	return 1;
  	}
  	
  
  /* Minimal callback just to output policy info (if any) */
  
  static int smime_cb(int ok, X509_STORE_CTX *ctx)
  	{
  	int error;
  
  	error = X509_STORE_CTX_get_error(ctx);
  
  	if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
  		&& ((error != X509_V_OK) || (ok != 2)))
  		return ok;
  
  	policies_print(NULL, ctx);
  
  	return ok;
  
  	}
  