apps/smime.c

   1 /* smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* S/MIME utility function */
  60
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include "apps.h"
  64 #include <openssl/crypto.h>
  65 #include <openssl/pem.h>
  66 #include <openssl/err.h>
  67
  68 #undef PROG
  69 #define PROG smime_main
  70 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  71
  72 #define SMIME_OP        0x10
  73 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  74 #define SMIME_DECRYPT   2
  75 #define SMIME_SIGN      (3 | SMIME_OP)
  76 #define SMIME_VERIFY    4
  77 #define SMIME_PK7OUT    5
  78
  79 int MAIN(int, char **);
  80
  81 int MAIN(int argc, char **argv)
  82 {
  83         ENGINE *e = NULL;
  84         int operation = 0;
  85         int ret = 0;
  86         char **args;
  87         char *inmode = "r", *outmode = "w";
  88         char *infile = NULL, *outfile = NULL;
  89         char *signerfile = NULL, *recipfile = NULL;
  90         char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
  91         const EVP_CIPHER *cipher = NULL;
  92         PKCS7 *p7 = NULL;
  93         X509_STORE *store = NULL;
  94         X509 *cert = NULL, *recip = NULL, *signer = NULL;
  95         EVP_PKEY *key = NULL;
  96         STACK_OF(X509) *encerts = NULL, *other = NULL;
  97         BIO *in = NULL, *out = NULL, *indata = NULL;
  98         int badarg = 0;
  99         int flags = PKCS7_DETACHED, store_flags = 0;
 100         char *to = NULL, *from = NULL, *subject = NULL;
 101         char *CAfile = NULL, *CApath = NULL;
 102         char *passargin = NULL, *passin = NULL;
 103         char *inrand = NULL;
 104         int need_rand = 0;
 105         int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 106         int keyform = FORMAT_PEM;
 107         char *engine=NULL;
 108
 109         args = argv + 1;
 110         ret = 1;
 111
 112         while (!badarg && *args && *args[0] == '-') {
 113                 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 114                 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 115                 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 116                 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 117                 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 118 #ifndef OPENSSL_NO_DES
 119                 else if (!strcmp (*args, "-des3"))
 120                                 cipher = EVP_des_ede3_cbc();
 121                 else if (!strcmp (*args, "-des"))
 122                                 cipher = EVP_des_cbc();
 123 #endif
 124 #ifndef OPENSSL_NO_RC2
 125                 else if (!strcmp (*args, "-rc2-40"))
 126                                 cipher = EVP_rc2_40_cbc();
 127                 else if (!strcmp (*args, "-rc2-128"))
 128                                 cipher = EVP_rc2_cbc();
 129                 else if (!strcmp (*args, "-rc2-64"))
 130                                 cipher = EVP_rc2_64_cbc();
 131 #endif
 132                 else if (!strcmp (*args, "-text"))
 133                                 flags |= PKCS7_TEXT;
 134                 else if (!strcmp (*args, "-nointern"))
 135                                 flags |= PKCS7_NOINTERN;
 136                 else if (!strcmp (*args, "-noverify"))
 137                                 flags |= PKCS7_NOVERIFY;
 138                 else if (!strcmp (*args, "-nochain"))
 139                                 flags |= PKCS7_NOCHAIN;
 140                 else if (!strcmp (*args, "-nocerts"))
 141                                 flags |= PKCS7_NOCERTS;
 142                 else if (!strcmp (*args, "-noattr"))
 143                                 flags |= PKCS7_NOATTR;
 144                 else if (!strcmp (*args, "-nodetach"))
 145                                 flags &= ~PKCS7_DETACHED;
 146                 else if (!strcmp (*args, "-nosmimecap"))
 147                                 flags |= PKCS7_NOSMIMECAP;
 148                 else if (!strcmp (*args, "-binary"))
 149                                 flags |= PKCS7_BINARY;
 150                 else if (!strcmp (*args, "-nosigs"))
 151                                 flags |= PKCS7_NOSIGS;
 152                 else if (!strcmp (*args, "-crl_check"))
 153                                 store_flags |= X509_V_FLAG_CRL_CHECK;
 154                 else if (!strcmp (*args, "-crl_check_all"))
 155                                 store_flags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL;
 156                 else if (!strcmp(*args,"-rand")) {
 157                         if (args[1]) {
 158                                 args++;
 159                                 inrand = *args;
 160                         } else badarg = 1;
 161                         need_rand = 1;
 162                 } else if (!strcmp(*args,"-engine")) {
 163                         if (args[1]) {
 164                                 args++;
 165                                 engine = *args;
 166                         } else badarg = 1;
 167                 } else if (!strcmp(*args,"-passin")) {
 168                         if (args[1]) {
 169                                 args++;
 170                                 passargin = *args;
 171                         } else badarg = 1;
 172                 } else if (!strcmp (*args, "-to")) {
 173                         if (args[1]) {
 174                                 args++;
 175                                 to = *args;
 176                         } else badarg = 1;
 177                 } else if (!strcmp (*args, "-from")) {
 178                         if (args[1]) {
 179                                 args++;
 180                                 from = *args;
 181                         } else badarg = 1;
 182                 } else if (!strcmp (*args, "-subject")) {
 183                         if (args[1]) {
 184                                 args++;
 185                                 subject = *args;
 186                         } else badarg = 1;
 187                 } else if (!strcmp (*args, "-signer")) {
 188                         if (args[1]) {
 189                                 args++;
 190                                 signerfile = *args;
 191                         } else badarg = 1;
 192                 } else if (!strcmp (*args, "-recip")) {
 193                         if (args[1]) {
 194                                 args++;
 195                                 recipfile = *args;
 196                         } else badarg = 1;
 197                 } else if (!strcmp (*args, "-inkey")) {
 198                         if (args[1]) {
 199                                 args++;
 200                                 keyfile = *args;
 201                         } else badarg = 1;
 202                 } else if (!strcmp (*args, "-keyform")) {
 203                         if (args[1]) {
 204                                 args++;
 205                                 keyform = str2fmt(*args);
 206                         } else badarg = 1;
 207                 } else if (!strcmp (*args, "-certfile")) {
 208                         if (args[1]) {
 209                                 args++;
 210                                 certfile = *args;
 211                         } else badarg = 1;
 212                 } else if (!strcmp (*args, "-CAfile")) {
 213                         if (args[1]) {
 214                                 args++;
 215                                 CAfile = *args;
 216                         } else badarg = 1;
 217                 } else if (!strcmp (*args, "-CApath")) {
 218                         if (args[1]) {
 219                                 args++;
 220                                 CApath = *args;
 221                         } else badarg = 1;
 222                 } else if (!strcmp (*args, "-in")) {
 223                         if (args[1]) {
 224                                 args++;
 225                                 infile = *args;
 226                         } else badarg = 1;
 227                 } else if (!strcmp (*args, "-inform")) {
 228                         if (args[1]) {
 229                                 args++;
 230                                 informat = str2fmt(*args);
 231                         } else badarg = 1;
 232                 } else if (!strcmp (*args, "-outform")) {
 233                         if (args[1]) {
 234                                 args++;
 235                                 outformat = str2fmt(*args);
 236                         } else badarg = 1;
 237                 } else if (!strcmp (*args, "-out")) {
 238                         if (args[1]) {
 239                                 args++;
 240                                 outfile = *args;
 241                         } else badarg = 1;
 242                 } else if (!strcmp (*args, "-content")) {
 243                         if (args[1]) {
 244                                 args++;
 245                                 contfile = *args;
 246                         } else badarg = 1;
 247                 } else badarg = 1;
 248                 args++;
 249         }
 250
 251         if(operation == SMIME_SIGN) {
 252                 if(!signerfile) {
 253                         BIO_printf(bio_err, "No signer certificate specified\n");
 254                         badarg = 1;
 255                 }
 256                 need_rand = 1;
 257         } else if(operation == SMIME_DECRYPT) {
 258                 if(!recipfile) {
 259                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 260                         badarg = 1;
 261                 }
 262         } else if(operation == SMIME_ENCRYPT) {
 263                 if(!*args) {
 264                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 265                         badarg = 1;
 266                 }
 267                 need_rand = 1;
 268         } else if(!operation) badarg = 1;
 269
 270         if (badarg) {
 271                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 272                 BIO_printf (bio_err, "where options are\n");
 273                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 274                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 275                 BIO_printf (bio_err, "-sign          sign message\n");
 276                 BIO_printf (bio_err, "-verify        verify signed message\n");
 277                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 278 #ifndef OPENSSL_NO_DES
 279                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 280                 BIO_printf (bio_err, "-des           encrypt with DES\n");
 281 #endif
 282 #ifndef OPENSSL_NO_RC2
 283                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 284                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 285                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 286 #endif
 287                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 288                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 289                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 290                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 291                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 292                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 293                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 294                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 295                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 296                 BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
 297                 BIO_printf (bio_err, "-in file       input file\n");
 298                 BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
 299                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 300                 BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
 301                 BIO_printf (bio_err, "-out file      output file\n");
 302                 BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
 303                 BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
 304                 BIO_printf (bio_err, "-to addr       to address\n");
 305                 BIO_printf (bio_err, "-from ad       from address\n");
 306                 BIO_printf (bio_err, "-subject s     subject\n");
 307                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 308                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 309                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 310                 BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
 311                 BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
 312                 BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
 313                 BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
 314                 BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 315                 BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 316                 BIO_printf(bio_err,  "               the random number generator\n");
 317                 BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 318                 goto end;
 319         }
 320
 321         e = setup_engine(bio_err, engine, 0);
 322
 323         if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
 324                 BIO_printf(bio_err, "Error getting password\n");
 325                 goto end;
 326         }
 327
 328         if (need_rand) {
 329                 app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 330                 if (inrand != NULL)
 331                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 332                                 app_RAND_load_files(inrand));
 333         }
 334
 335         ret = 2;
 336
 337         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 338
 339         if(operation & SMIME_OP) {
 340                 if(flags & PKCS7_BINARY) inmode = "rb";
 341                 if(outformat == FORMAT_ASN1) outmode = "wb";
 342         } else {
 343                 if(flags & PKCS7_BINARY) outmode = "wb";
 344                 if(informat == FORMAT_ASN1) inmode = "rb";
 345         }
 346
 347         if(operation == SMIME_ENCRYPT) {
 348                 if (!cipher) {
 349 #ifndef OPENSSL_NO_RC2
 350                         cipher = EVP_rc2_40_cbc();
 351 #else
 352                         BIO_printf(bio_err, "No cipher selected\n");
 353                         goto end;
 354 #endif
 355                 }
 356                 encerts = sk_X509_new_null();
 357                 while (*args) {
 358                         if(!(cert = load_cert(bio_err,*args,FORMAT_PEM,
 359                                 NULL, e, "recipient certificate file"))) {
 360 #if 0                           /* An appropriate message is already printed */
 361                                 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
 362 #endif
 363                                 goto end;
 364                         }
 365                         sk_X509_push(encerts, cert);
 366                         cert = NULL;
 367                         args++;
 368                 }
 369         }
 370
 371         if(signerfile && (operation == SMIME_SIGN)) {
 372                 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM, NULL,
 373                         e, "signer certificate"))) {
 374 #if 0                   /* An appropri message has already been printed */
 375                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 376 #endif
 377                         goto end;
 378                 }
 379         }
 380
 381         if(certfile) {
 382                 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
 383                         e, "certificate file"))) {
 384 #if 0                   /* An appropriate message has already been printed */
 385                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 386 #endif
 387                         ERR_print_errors(bio_err);
 388                         goto end;
 389                 }
 390         }
 391
 392         if(recipfile && (operation == SMIME_DECRYPT)) {
 393                 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
 394                         e, "recipient certificate file"))) {
 395 #if 0                   /* An appropriate message has alrady been printed */
 396                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 397 #endif
 398                         ERR_print_errors(bio_err);
 399                         goto end;
 400                 }
 401         }
 402
 403         if(operation == SMIME_DECRYPT) {
 404                 if(!keyfile) keyfile = recipfile;
 405         } else if(operation == SMIME_SIGN) {
 406                 if(!keyfile) keyfile = signerfile;
 407         } else keyfile = NULL;
 408
 409         if(keyfile) {
 410                 key = load_key(bio_err, keyfile, keyform, passin, e,
 411                                "signing key file");
 412                 if (!key) {
 413                         goto end;
 414                 }
 415         }
 416
 417         if (infile) {
 418                 if (!(in = BIO_new_file(infile, inmode))) {
 419                         BIO_printf (bio_err,
 420                                  "Can't open input file %s\n", infile);
 421                         goto end;
 422                 }
 423         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 424
 425         if (outfile) {
 426                 if (!(out = BIO_new_file(outfile, outmode))) {
 427                         BIO_printf (bio_err,
 428                                  "Can't open output file %s\n", outfile);
 429                         goto end;
 430                 }
 431         } else {
 432                 out = BIO_new_fp(stdout, BIO_NOCLOSE);
 433 #ifdef OPENSSL_SYS_VMS
 434                 {
 435                     BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 436                     out = BIO_push(tmpbio, out);
 437                 }
 438 #endif
 439         }
 440
 441         if(operation == SMIME_VERIFY) {
 442                 if(!(store = setup_verify(bio_err, CAfile, CApath))) goto end;
 443                 X509_STORE_set_flags(store, store_flags);
 444         }
 445
 446
 447         ret = 3;
 448
 449         if(operation == SMIME_ENCRYPT) {
 450                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 451         } else if(operation == SMIME_SIGN) {
 452                 p7 = PKCS7_sign(signer, key, other, in, flags);
 453                 BIO_reset(in);
 454         } else {
 455                 if(informat == FORMAT_SMIME)
 456                         p7 = SMIME_read_PKCS7(in, &indata);
 457                 else if(informat == FORMAT_PEM)
 458                         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 459                 else if(informat == FORMAT_ASN1)
 460                         p7 = d2i_PKCS7_bio(in, NULL);
 461                 else {
 462                         BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 463                         goto end;
 464                 }
 465
 466                 if(!p7) {
 467                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 468                         goto end;
 469                 }
 470                 if(contfile) {
 471                         BIO_free(indata);
 472                         if(!(indata = BIO_new_file(contfile, "rb"))) {
 473                                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 474                                 goto end;
 475                         }
 476                 }
 477         }
 478
 479         if(!p7) {
 480                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 481                 goto end;
 482         }
 483
 484         ret = 4;
 485         if(operation == SMIME_DECRYPT) {
 486                 if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 487                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 488                         goto end;
 489                 }
 490         } else if(operation == SMIME_VERIFY) {
 491                 STACK_OF(X509) *signers;
 492                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 493                         BIO_printf(bio_err, "Verification Successful\n");
 494                 } else {
 495                         BIO_printf(bio_err, "Verification Failure\n");
 496                         goto end;
 497                 }
 498                 signers = PKCS7_get0_signers(p7, other, flags);
 499                 if(!save_certs(signerfile, signers)) {
 500                         BIO_printf(bio_err, "Error writing signers to %s\n",
 501                                                                 signerfile);
 502                         ret = 5;
 503                         goto end;
 504                 }
 505                 sk_X509_free(signers);
 506         } else if(operation == SMIME_PK7OUT) {
 507                 PEM_write_bio_PKCS7(out, p7);
 508         } else {
 509                 if(to) BIO_printf(out, "To: %s\n", to);
 510                 if(from) BIO_printf(out, "From: %s\n", from);
 511                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 512                 if(outformat == FORMAT_SMIME)
 513                         SMIME_write_PKCS7(out, p7, in, flags);
 514                 else if(outformat == FORMAT_PEM)
 515                         PEM_write_bio_PKCS7(out,p7);
 516                 else if(outformat == FORMAT_ASN1)
 517                         i2d_PKCS7_bio(out,p7);
 518                 else {
 519                         BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 520                         goto end;
 521                 }
 522         }
 523         ret = 0;
 524 end:
 525         if (need_rand)
 526                 app_RAND_write_file(NULL, bio_err);
 527         if(ret) ERR_print_errors(bio_err);
 528         sk_X509_pop_free(encerts, X509_free);
 529         sk_X509_pop_free(other, X509_free);
 530         X509_STORE_free(store);
 531         X509_free(cert);
 532         X509_free(recip);
 533         X509_free(signer);
 534         EVP_PKEY_free(key);
 535         PKCS7_free(p7);
 536         BIO_free(in);
 537         BIO_free(indata);
 538         BIO_free_all(out);
 539         if(passin) OPENSSL_free(passin);
 540         return (ret);
 541 }
 542
 543 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 544 {
 545         int i;
 546         BIO *tmp;
 547         if(!signerfile) return 1;
 548         tmp = BIO_new_file(signerfile, "w");
 549         if(!tmp) return 0;
 550         for(i = 0; i < sk_X509_num(signers); i++)
 551                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 552         BIO_free(tmp);
 553         return 1;
 554 }
 555