crypto/pkcs7/pk7_smime.c

   1 /* pk7_smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999-2004 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 /* Simple PKCS#7 processing functions */
  60
  61 #include <stdio.h>
  62 #include "cryptlib.h"
  63 #include <openssl/x509.h>
  64 #include <openssl/x509v3.h>
  65
  66 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
  67
  68 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
  69                   BIO *data, int flags)
  70 {
  71         PKCS7 *p7;
  72         int i;
  73
  74         if(!(p7 = PKCS7_new()))
  75                 {
  76                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
  77                 return NULL;
  78                 }
  79
  80         if (!PKCS7_set_type(p7, NID_pkcs7_signed))
  81                 goto err;
  82
  83         if (!PKCS7_content_new(p7, NID_pkcs7_data))
  84                 goto err;
  85
  86         if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags))
  87                 {
  88                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
  89                 goto err;
  90                 }
  91
  92         if(!(flags & PKCS7_NOCERTS))
  93                 {
  94                 for(i = 0; i < sk_X509_num(certs); i++)
  95                         {
  96                         if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
  97                                 goto err;
  98                         }
  99                 }
 100
 101         if(flags & PKCS7_DETACHED)
 102                 PKCS7_set_detached(p7, 1);
 103
 104         if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
 105                 return p7;
 106
 107         if (PKCS7_final(p7, data, flags))
 108                 return p7;
 109
 110         err:
 111         PKCS7_free(p7);
 112         return NULL;
 113 }
 114
 115 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
 116         {
 117         BIO *p7bio;
 118         int ret = 0;
 119         if (!(p7bio = PKCS7_dataInit(p7, NULL)))
 120                 {
 121                 PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE);
 122                 return 0;
 123                 }
 124
 125         SMIME_crlf_copy(data, p7bio, flags);
 126
 127         BIO_flush(p7bio);
 128
 129
 130         if (!PKCS7_dataFinal(p7,p7bio))
 131                 {
 132                 PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN);
 133                 goto err;
 134                 }
 135
 136         ret = 1;
 137
 138         err:
 139         BIO_free_all(p7bio);
 140
 141         return ret;
 142
 143         }
 144
 145 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 146
 147 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 148         {
 149         if (EVP_get_cipherbynid(nid))
 150                 return PKCS7_simple_smimecap(sk, nid, arg);
 151         return 1;
 152         }
 153
 154 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 155         {
 156         if (EVP_get_digestbynid(nid))
 157                 return PKCS7_simple_smimecap(sk, nid, arg);
 158         return 1;
 159         }
 160
 161 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
 162                                         EVP_PKEY *pkey, const EVP_MD *md,
 163                                         int flags)
 164         {
 165         PKCS7_SIGNER_INFO *si = NULL;
 166         int si_free = 1;
 167         STACK_OF(X509_ALGOR) *smcap = NULL;
 168         if(!X509_check_private_key(signcert, pkey))
 169                 {
 170                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 171                         PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 172                 return NULL;
 173                 }
 174
 175         if (!(si = PKCS7_add_signature(p7,signcert,pkey, md)))
 176                 {
 177                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 178                                 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
 179                 return NULL;
 180                 }
 181
 182         /* si is now part of p7 so don't free it on error */
 183
 184         si_free = 0;
 185
 186         if(!(flags & PKCS7_NOCERTS))
 187                 {
 188                 if (!PKCS7_add_certificate(p7, signcert))
 189                         goto err;
 190                 }
 191
 192         if(!(flags & PKCS7_NOATTR))
 193                 {
 194                 if (!PKCS7_add_attrib_content_type(si, NULL))
 195                         goto err;
 196                 /* Add SMIMECapabilities */
 197                 if(!(flags & PKCS7_NOSMIMECAP))
 198                         {
 199                         if(!(smcap = sk_X509_ALGOR_new_null()))
 200                                 {
 201                                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 202                                         ERR_R_MALLOC_FAILURE);
 203                                 goto err;
 204                                 }
 205                         if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 206                         || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 207                         || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 208                                 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 209                                 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 210                         || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 211                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 212                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 213                                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
 214                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
 215                                 || !PKCS7_add_attrib_smimecap (si, smcap))
 216                                 goto err;
 217                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 218                         smcap = NULL;
 219                         }
 220                 if (flags & PKCS7_REUSE_DIGEST)
 221                         {
 222                         if (!pkcs7_copy_existing_digest(p7, si))
 223                                 goto err;
 224                         if (!PKCS7_SIGNER_INFO_sign(si))
 225                                 goto err;
 226                         }
 227                 }
 228         return si;
 229         err:
 230         if (smcap)
 231                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 232         if (si && si_free)
 233                 PKCS7_SIGNER_INFO_free(si);
 234         return NULL;
 235         }
 236
 237 /* Search for a digest matching SignerInfo digest type and if found
 238  * copy across.
 239  */
 240
 241 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 242         {
 243         int i;
 244         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 245         PKCS7_SIGNER_INFO *sitmp;
 246         ASN1_OCTET_STRING *osdig = NULL;
 247         sinfos = PKCS7_get_signer_info(p7);
 248         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 249                 {
 250                 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 251                 if (si == sitmp)
 252                         break;
 253                 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
 254                         continue;
 255                 if (!OBJ_cmp(si->digest_alg->algorithm,
 256                                 sitmp->digest_alg->algorithm))
 257                         {
 258                         osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
 259                         break;
 260                         }
 261
 262                 }
 263
 264         if (osdig)
 265                 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
 266
 267         PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
 268                         PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
 269         return 0;
 270         }
 271
 272 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 273                                         BIO *indata, BIO *out, int flags)
 274 {
 275         STACK_OF(X509) *signers;
 276         X509 *signer;
 277         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 278         PKCS7_SIGNER_INFO *si;
 279         X509_STORE_CTX cert_ctx;
 280         char buf[4096];
 281         int i, j=0, k, ret = 0;
 282         BIO *p7bio;
 283         BIO *tmpin, *tmpout;
 284
 285         if(!p7) {
 286                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 287                 return 0;
 288         }
 289
 290         if(!PKCS7_type_is_signed(p7)) {
 291                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 292                 return 0;
 293         }
 294
 295         /* Check for no data and no content: no data to verify signature */
 296         if(PKCS7_get_detached(p7) && !indata) {
 297                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 298                 return 0;
 299         }
 300 #if 0
 301         /* NB: this test commented out because some versions of Netscape
 302          * illegally include zero length content when signing data.
 303          */
 304
 305         /* Check for data and content: two sets of data */
 306         if(!PKCS7_get_detached(p7) && indata) {
 307                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 308                 return 0;
 309         }
 310 #endif
 311
 312         sinfos = PKCS7_get_signer_info(p7);
 313
 314         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 315                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 316                 return 0;
 317         }
 318
 319
 320         signers = PKCS7_get0_signers(p7, certs, flags);
 321
 322         if(!signers) return 0;
 323
 324         /* Now verify the certificates */
 325
 326         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 327                 signer = sk_X509_value (signers, k);
 328                 if (!(flags & PKCS7_NOCHAIN)) {
 329                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 330                                                         p7->d.sign->cert))
 331                                 {
 332                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 333                                 sk_X509_free(signers);
 334                                 return 0;
 335                                 }
 336                         X509_STORE_CTX_set_purpose(&cert_ctx,
 337                                                 X509_PURPOSE_SMIME_SIGN);
 338                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 339                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 340                         sk_X509_free(signers);
 341                         return 0;
 342                 }
 343                 if (!(flags & PKCS7_NOCRL))
 344                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 345                 i = X509_verify_cert(&cert_ctx);
 346                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 347                 X509_STORE_CTX_cleanup(&cert_ctx);
 348                 if (i <= 0) {
 349                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 350                         ERR_add_error_data(2, "Verify error:",
 351                                          X509_verify_cert_error_string(j));
 352                         sk_X509_free(signers);
 353                         return 0;
 354                 }
 355                 /* Check for revocation status here */
 356         }
 357
 358         /* Performance optimization: if the content is a memory BIO then
 359          * store its contents in a temporary read only memory BIO. This
 360          * avoids potentially large numbers of slow copies of data which will
 361          * occur when reading from a read write memory BIO when signatures
 362          * are calculated.
 363          */
 364
 365         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 366                 {
 367                 char *ptr;
 368                 long len;
 369                 len = BIO_get_mem_data(indata, &ptr);
 370                 tmpin = BIO_new_mem_buf(ptr, len);
 371                 if (tmpin == NULL)
 372                         {
 373                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 374                         return 0;
 375                         }
 376                 }
 377         else
 378                 tmpin = indata;
 379
 380
 381         p7bio=PKCS7_dataInit(p7,tmpin);
 382
 383         if(flags & PKCS7_TEXT) {
 384                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 385                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 386                         goto err;
 387                 }
 388         } else tmpout = out;
 389
 390         /* We now have to 'read' from p7bio to calculate digests etc. */
 391         for (;;)
 392         {
 393                 i=BIO_read(p7bio,buf,sizeof(buf));
 394                 if (i <= 0) break;
 395                 if (tmpout) BIO_write(tmpout, buf, i);
 396         }
 397
 398         if(flags & PKCS7_TEXT) {
 399                 if(!SMIME_text(tmpout, out)) {
 400                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 401                         BIO_free(tmpout);
 402                         goto err;
 403                 }
 404                 BIO_free(tmpout);
 405         }
 406
 407         /* Now Verify All Signatures */
 408         if (!(flags & PKCS7_NOSIGS))
 409             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 410                 {
 411                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 412                 signer = sk_X509_value (signers, i);
 413                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 414                 if (j <= 0) {
 415                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 416                         goto err;
 417                 }
 418         }
 419
 420         ret = 1;
 421
 422         err:
 423
 424         if (tmpin == indata)
 425                 {
 426                 if (indata) BIO_pop(p7bio);
 427                 }
 428         BIO_free_all(p7bio);
 429
 430         sk_X509_free(signers);
 431
 432         return ret;
 433 }
 434
 435 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 436 {
 437         STACK_OF(X509) *signers;
 438         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 439         PKCS7_SIGNER_INFO *si;
 440         PKCS7_ISSUER_AND_SERIAL *ias;
 441         X509 *signer;
 442         int i;
 443
 444         if(!p7) {
 445                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 446                 return NULL;
 447         }
 448
 449         if(!PKCS7_type_is_signed(p7)) {
 450                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 451                 return NULL;
 452         }
 453
 454         /* Collect all the signers together */
 455
 456         sinfos = PKCS7_get_signer_info(p7);
 457
 458         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 459                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 460                 return 0;
 461         }
 462
 463         if(!(signers = sk_X509_new_null())) {
 464                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 465                 return NULL;
 466         }
 467
 468         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 469         {
 470             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 471             ias = si->issuer_and_serial;
 472             signer = NULL;
 473                 /* If any certificates passed they take priority */
 474             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 475                                                 ias->issuer, ias->serial);
 476             if (!signer && !(flags & PKCS7_NOINTERN)
 477                         && p7->d.sign->cert) signer =
 478                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 479                                                 ias->issuer, ias->serial);
 480             if (!signer) {
 481                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 482                         sk_X509_free(signers);
 483                         return 0;
 484             }
 485
 486             sk_X509_push(signers, signer);
 487         }
 488         return signers;
 489 }
 490
 491
 492 /* Build a complete PKCS#7 enveloped data */
 493
 494 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 495                                                                 int flags)
 496 {
 497         PKCS7 *p7;
 498         BIO *p7bio = NULL;
 499         int i;
 500         X509 *x509;
 501         if(!(p7 = PKCS7_new())) {
 502                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 503                 return NULL;
 504         }
 505
 506         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 507         if(!PKCS7_set_cipher(p7, cipher)) {
 508                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 509                 goto err;
 510         }
 511
 512         for(i = 0; i < sk_X509_num(certs); i++) {
 513                 x509 = sk_X509_value(certs, i);
 514                 if(!PKCS7_add_recipient(p7, x509)) {
 515                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 516                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 517                         goto err;
 518                 }
 519         }
 520
 521         if (PKCS7_final(p7, in, flags))
 522                 return p7;
 523
 524         err:
 525
 526         BIO_free(p7bio);
 527         PKCS7_free(p7);
 528         return NULL;
 529
 530 }
 531
 532 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 533 {
 534         BIO *tmpmem;
 535         int ret, i;
 536         char buf[4096];
 537
 538         if(!p7) {
 539                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 540                 return 0;
 541         }
 542
 543         if(!PKCS7_type_is_enveloped(p7)) {
 544                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 545                 return 0;
 546         }
 547
 548         if(cert && !X509_check_private_key(cert, pkey)) {
 549                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 550                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 551                 return 0;
 552         }
 553
 554         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 555                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 556                 return 0;
 557         }
 558
 559         if (flags & PKCS7_TEXT) {
 560                 BIO *tmpbuf, *bread;
 561                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 562                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 563                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 564                         return 0;
 565                 }
 566                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 567                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 568                         return 0;
 569                 }
 570                 ret = SMIME_text(bread, data);
 571                 BIO_free_all(bread);
 572                 return ret;
 573         } else {
 574                 for(;;) {
 575                         i = BIO_read(tmpmem, buf, sizeof(buf));
 576                         if(i <= 0) break;
 577                         BIO_write(data, buf, i);
 578                 }
 579                 BIO_free_all(tmpmem);
 580                 return 1;
 581         }
 582 }