crypto/libressl/crypto/pkcs7/pk7_smime.c

   1 /* $OpenBSD: pk7_smime.c,v 1.19 2014/11/09 19:17:13 miod Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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
  63 #include <openssl/err.h>
  64 #include <openssl/x509.h>
  65 #include <openssl/x509v3.h>
  66
  67 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
  68
  69 PKCS7 *
  70 PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data,
  71     int flags)
  72 {
  73         PKCS7 *p7;
  74         int i;
  75
  76         if (!(p7 = PKCS7_new())) {
  77                 PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
  78                 return NULL;
  79         }
  80
  81         if (!PKCS7_set_type(p7, NID_pkcs7_signed))
  82                 goto err;
  83
  84         if (!PKCS7_content_new(p7, NID_pkcs7_data))
  85                 goto err;
  86
  87         if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
  88                 PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
  89                 goto err;
  90         }
  91
  92         if (!(flags & PKCS7_NOCERTS)) {
  93                 for (i = 0; i < sk_X509_num(certs); i++) {
  94                         if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
  95                                 goto err;
  96                 }
  97         }
  98
  99         if (flags & PKCS7_DETACHED)
 100                 PKCS7_set_detached(p7, 1);
 101
 102         if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
 103                 return p7;
 104
 105         if (PKCS7_final(p7, data, flags))
 106                 return p7;
 107
 108 err:
 109         PKCS7_free(p7);
 110         return NULL;
 111 }
 112
 113 int
 114 PKCS7_final(PKCS7 *p7, BIO *data, int flags)
 115 {
 116         BIO *p7bio;
 117         int ret = 0;
 118
 119         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 120                 PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
 121                 return 0;
 122         }
 123
 124         SMIME_crlf_copy(data, p7bio, flags);
 125
 126         (void)BIO_flush(p7bio);
 127
 128         if (!PKCS7_dataFinal(p7, p7bio)) {
 129                 PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
 130                 goto err;
 131         }
 132
 133         ret = 1;
 134
 135 err:
 136         BIO_free_all(p7bio);
 137
 138         return ret;
 139 }
 140
 141 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 142
 143 static int
 144 add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 145 {
 146         if (EVP_get_cipherbynid(nid))
 147                 return PKCS7_simple_smimecap(sk, nid, arg);
 148         return 1;
 149 }
 150
 151 static int
 152 add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 153 {
 154         if (EVP_get_digestbynid(nid))
 155                 return PKCS7_simple_smimecap(sk, nid, arg);
 156         return 1;
 157 }
 158
 159 PKCS7_SIGNER_INFO *
 160 PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, EVP_PKEY *pkey,
 161     const EVP_MD *md, int flags)
 162 {
 163         PKCS7_SIGNER_INFO *si = NULL;
 164         STACK_OF(X509_ALGOR) *smcap = NULL;
 165
 166         if (!X509_check_private_key(signcert, pkey)) {
 167                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 168                     PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 169                 return NULL;
 170         }
 171
 172         if (!(si = PKCS7_add_signature(p7, signcert, pkey, md))) {
 173                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 174                     PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
 175                 return NULL;
 176         }
 177
 178         if (!(flags & PKCS7_NOCERTS)) {
 179                 if (!PKCS7_add_certificate(p7, signcert))
 180                         goto err;
 181         }
 182
 183         if (!(flags & PKCS7_NOATTR)) {
 184                 if (!PKCS7_add_attrib_content_type(si, NULL))
 185                         goto err;
 186                 /* Add SMIMECapabilities */
 187                 if (!(flags & PKCS7_NOSMIMECAP)) {
 188                         if (!(smcap = sk_X509_ALGOR_new_null())) {
 189                                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 190                                     ERR_R_MALLOC_FAILURE);
 191                                 goto err;
 192                         }
 193                         if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1) ||
 194                             !add_digest_smcap(smcap, NID_id_GostR3411_94, -1) ||
 195                             !add_digest_smcap(smcap, NID_id_tc26_gost3411_2012_256, -1) ||
 196                             !add_digest_smcap(smcap, NID_id_tc26_gost3411_2012_512, -1) ||
 197                             !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1) ||
 198                             !add_cipher_smcap(smcap, NID_aes_192_cbc, -1) ||
 199                             !add_cipher_smcap(smcap, NID_aes_128_cbc, -1) ||
 200                             !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) ||
 201                             !add_cipher_smcap(smcap, NID_rc2_cbc, 128) ||
 202                             !add_cipher_smcap(smcap, NID_rc2_cbc, 64) ||
 203                             !add_cipher_smcap(smcap, NID_des_cbc, -1) ||
 204                             !add_cipher_smcap(smcap, NID_rc2_cbc, 40) ||
 205                             !PKCS7_add_attrib_smimecap(si, smcap))
 206                                 goto err;
 207                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 208                         smcap = NULL;
 209                 }
 210                 if (flags & PKCS7_REUSE_DIGEST) {
 211                         if (!pkcs7_copy_existing_digest(p7, si))
 212                                 goto err;
 213                         if (!(flags & PKCS7_PARTIAL) &&
 214                             !PKCS7_SIGNER_INFO_sign(si))
 215                                 goto err;
 216                 }
 217         }
 218         return si;
 219
 220 err:
 221         if (smcap)
 222                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 223         return NULL;
 224 }
 225
 226 /* Search for a digest matching SignerInfo digest type and if found
 227  * copy across.
 228  */
 229
 230 static int
 231 pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 232 {
 233         int i;
 234         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 235         PKCS7_SIGNER_INFO *sitmp;
 236         ASN1_OCTET_STRING *osdig = NULL;
 237
 238         sinfos = PKCS7_get_signer_info(p7);
 239         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
 240                 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 241                 if (si == sitmp)
 242                         break;
 243                 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
 244                         continue;
 245                 if (!OBJ_cmp(si->digest_alg->algorithm,
 246                     sitmp->digest_alg->algorithm)) {
 247                         osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
 248                         break;
 249                 }
 250
 251         }
 252
 253         if (osdig)
 254                 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
 255
 256         PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
 257             PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
 258         return 0;
 259 }
 260
 261 int
 262 PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, BIO *indata,
 263     BIO *out, int flags)
 264 {
 265         STACK_OF(X509) *signers;
 266         X509 *signer;
 267         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 268         PKCS7_SIGNER_INFO *si;
 269         X509_STORE_CTX cert_ctx;
 270         char buf[4096];
 271         int i, j = 0, k, ret = 0;
 272         BIO *p7bio;
 273         BIO *tmpin, *tmpout;
 274
 275         if (!p7) {
 276                 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
 277                 return 0;
 278         }
 279
 280         if (!PKCS7_type_is_signed(p7)) {
 281                 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_WRONG_CONTENT_TYPE);
 282                 return 0;
 283         }
 284
 285         /* Check for no data and no content: no data to verify signature */
 286         if (PKCS7_get_detached(p7) && !indata) {
 287                 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_CONTENT);
 288                 return 0;
 289         }
 290
 291         /*
 292          * Very old Netscape illegally included empty content with
 293          * a detached signature.  Very old users should upgrade.
 294          */
 295         /* Check for data and content: two sets of data */
 296         if (!PKCS7_get_detached(p7) && indata) {
 297                 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
 298                 return 0;
 299         }
 300
 301         sinfos = PKCS7_get_signer_info(p7);
 302
 303         if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 304                 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
 305                 return 0;
 306         }
 307
 308
 309         signers = PKCS7_get0_signers(p7, certs, flags);
 310
 311         if (!signers)
 312                 return 0;
 313
 314         /* Now verify the certificates */
 315
 316         if (!(flags & PKCS7_NOVERIFY))
 317                 for (k = 0; k < sk_X509_num(signers); k++) {
 318                         signer = sk_X509_value (signers, k);
 319                         if  (!(flags & PKCS7_NOCHAIN)) {
 320                                 if (!X509_STORE_CTX_init(&cert_ctx, store,
 321                                     signer, p7->d.sign->cert)) {
 322                                         PKCS7err(PKCS7_F_PKCS7_VERIFY,
 323                                             ERR_R_X509_LIB);
 324                                         sk_X509_free(signers);
 325                                         return 0;
 326                                 }
 327                                 X509_STORE_CTX_set_default(&cert_ctx,
 328                                     "smime_sign");
 329                         } else if (!X509_STORE_CTX_init(&cert_ctx, store,
 330                             signer, NULL)) {
 331                                 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
 332                                 sk_X509_free(signers);
 333                                 return 0;
 334                         }
 335                         if (!(flags & PKCS7_NOCRL))
 336                                 X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 337                         i = X509_verify_cert(&cert_ctx);
 338                         if (i <= 0)
 339                                 j = X509_STORE_CTX_get_error(&cert_ctx);
 340                         X509_STORE_CTX_cleanup(&cert_ctx);
 341                         if (i <= 0) {
 342                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,
 343                                     PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 344                                 ERR_asprintf_error_data("Verify error:%s",
 345                                     X509_verify_cert_error_string(j));
 346                                 sk_X509_free(signers);
 347                                 return 0;
 348                         }
 349                         /* Check for revocation status here */
 350                 }
 351
 352         /*
 353          * Performance optimization: if the content is a memory BIO then
 354          * store its contents in a temporary read only memory BIO. This
 355          * avoids potentially large numbers of slow copies of data which will
 356          * occur when reading from a read write memory BIO when signatures
 357          * are calculated.
 358          */
 359         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
 360                 char *ptr;
 361                 long len;
 362
 363                 len = BIO_get_mem_data(indata, &ptr);
 364                 tmpin = BIO_new_mem_buf(ptr, len);
 365                 if (tmpin == NULL) {
 366                         PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
 367                         return 0;
 368                 }
 369         } else
 370                 tmpin = indata;
 371
 372
 373         if (!(p7bio = PKCS7_dataInit(p7, tmpin)))
 374                 goto err;
 375
 376         if (flags & PKCS7_TEXT) {
 377                 if (!(tmpout = BIO_new(BIO_s_mem()))) {
 378                         PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
 379                         goto err;
 380                 }
 381                 BIO_set_mem_eof_return(tmpout, 0);
 382         } else
 383                 tmpout = out;
 384
 385         /* We now have to 'read' from p7bio to calculate digests etc. */
 386         for (;;) {
 387                 i = BIO_read(p7bio, buf, sizeof(buf));
 388                 if (i <= 0)
 389                         break;
 390                 if (tmpout)
 391                         BIO_write(tmpout, buf, i);
 392         }
 393
 394         if (flags & PKCS7_TEXT) {
 395                 if (!SMIME_text(tmpout, out)) {
 396                         PKCS7err(PKCS7_F_PKCS7_VERIFY,
 397                             PKCS7_R_SMIME_TEXT_ERROR);
 398                         BIO_free(tmpout);
 399                         goto err;
 400                 }
 401                 BIO_free(tmpout);
 402         }
 403
 404         /* Now Verify All Signatures */
 405         if (!(flags & PKCS7_NOSIGS))
 406                 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
 407                         si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 408                         signer = sk_X509_value (signers, i);
 409                         j = PKCS7_signatureVerify(p7bio, p7, si, signer);
 410                         if (j <= 0) {
 411                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,
 412                                     PKCS7_R_SIGNATURE_FAILURE);
 413                                 goto err;
 414                         }
 415                 }
 416
 417         ret = 1;
 418
 419 err:
 420         if (tmpin == indata) {
 421                 if (indata)
 422                         BIO_pop(p7bio);
 423         }
 424         BIO_free_all(p7bio);
 425         sk_X509_free(signers);
 426
 427         return ret;
 428 }
 429
 430 STACK_OF(X509) *
 431 PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 432 {
 433         STACK_OF(X509) *signers;
 434         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 435         PKCS7_SIGNER_INFO *si;
 436         PKCS7_ISSUER_AND_SERIAL *ias;
 437         X509 *signer;
 438         int i;
 439
 440         if (!p7) {
 441                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
 442                     PKCS7_R_INVALID_NULL_POINTER);
 443                 return NULL;
 444         }
 445
 446         if (!PKCS7_type_is_signed(p7)) {
 447                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
 448                     PKCS7_R_WRONG_CONTENT_TYPE);
 449                 return NULL;
 450         }
 451
 452         /* Collect all the signers together */
 453         sinfos = PKCS7_get_signer_info(p7);
 454         if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 455                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
 456                 return 0;
 457         }
 458
 459         if (!(signers = sk_X509_new_null())) {
 460                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
 461                 return NULL;
 462         }
 463
 464         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
 465                 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 466                 ias = si->issuer_and_serial;
 467                 signer = NULL;
 468                 /* If any certificates passed they take priority */
 469                 if (certs)
 470                         signer = X509_find_by_issuer_and_serial (certs,
 471                             ias->issuer, ias->serial);
 472                 if (!signer && !(flags & PKCS7_NOINTERN) && p7->d.sign->cert)
 473                         signer =
 474                             X509_find_by_issuer_and_serial(p7->d.sign->cert,
 475                               ias->issuer, ias->serial);
 476                 if (!signer) {
 477                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
 478                             PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 479                         sk_X509_free(signers);
 480                         return 0;
 481                 }
 482
 483                 if (!sk_X509_push(signers, signer)) {
 484                         sk_X509_free(signers);
 485                         return NULL;
 486                 }
 487         }
 488         return signers;
 489 }
 490
 491 /* Build a complete PKCS#7 enveloped data */
 492
 493 PKCS7 *
 494 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
 502         if (!(p7 = PKCS7_new())) {
 503                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
 504                 return NULL;
 505         }
 506
 507         if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
 508                 goto err;
 509         if (!PKCS7_set_cipher(p7, cipher)) {
 510                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER);
 511                 goto err;
 512         }
 513
 514         for (i = 0; i < sk_X509_num(certs); i++) {
 515                 x509 = sk_X509_value(certs, i);
 516                 if (!PKCS7_add_recipient(p7, x509)) {
 517                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 518                             PKCS7_R_ERROR_ADDING_RECIPIENT);
 519                         goto err;
 520                 }
 521         }
 522
 523         if (flags & PKCS7_STREAM)
 524                 return p7;
 525
 526         if (PKCS7_final(p7, in, flags))
 527                 return p7;
 528
 529 err:
 530         BIO_free_all(p7bio);
 531         PKCS7_free(p7);
 532         return NULL;
 533 }
 534
 535 int
 536 PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 537 {
 538         BIO *tmpmem;
 539         int ret, i;
 540         char buf[4096];
 541
 542         if (!p7) {
 543                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
 544                 return 0;
 545         }
 546
 547         if (!PKCS7_type_is_enveloped(p7)) {
 548                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
 549                 return 0;
 550         }
 551
 552         if (cert && !X509_check_private_key(cert, pkey)) {
 553                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 554                     PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 555                 return 0;
 556         }
 557
 558         if (!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 559                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 560                 return 0;
 561         }
 562
 563         if (flags & PKCS7_TEXT) {
 564                 BIO *tmpbuf;
 565
 566                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 567                 if (!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 568                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 569                         BIO_free_all(tmpmem);
 570                         return 0;
 571                 }
 572                 BIO_push(tmpbuf, tmpmem);
 573                 ret = SMIME_text(tmpbuf, data);
 574                 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
 575                         if (!BIO_get_cipher_status(tmpmem))
 576                                 ret = 0;
 577                 }
 578                 BIO_free_all(tmpbuf);
 579                 return ret;
 580         } else {
 581                 for (;;) {
 582                         i = BIO_read(tmpmem, buf, sizeof(buf));
 583                         if (i <= 0) {
 584                                 ret = 1;
 585                                 if (BIO_method_type(tmpmem) ==
 586                                     BIO_TYPE_CIPHER) {
 587                                         if (!BIO_get_cipher_status(tmpmem))
 588                                                 ret = 0;
 589                                 }
 590                                 break;
 591                         }
 592                         if (BIO_write(data, buf, i) != i) {
 593                                 ret = 0;
 594                                 break;
 595                         }
 596                 }
 597                 BIO_free_all(tmpmem);
 598                 return ret;
 599         }
 600 }