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