crypto/pkcs7/pk7_smime.c

   1 /* pk7_smime.c */
   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 #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         (void)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         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         if(!(flags & PKCS7_NOCERTS))
 182                 {
 183                 if (!PKCS7_add_certificate(p7, signcert))
 184                         goto err;
 185                 }
 186
 187         if(!(flags & PKCS7_NOATTR))
 188                 {
 189                 if (!PKCS7_add_attrib_content_type(si, NULL))
 190                         goto err;
 191                 /* Add SMIMECapabilities */
 192                 if(!(flags & PKCS7_NOSMIMECAP))
 193                         {
 194                         if(!(smcap = sk_X509_ALGOR_new_null()))
 195                                 {
 196                                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 197                                         ERR_R_MALLOC_FAILURE);
 198                                 goto err;
 199                                 }
 200                         if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 201                         || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 202                         || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 203                                 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 204                                 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 205                         || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 206                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 207                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 208                                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
 209                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
 210                                 || !PKCS7_add_attrib_smimecap (si, smcap))
 211                                 goto err;
 212                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 213                         smcap = NULL;
 214                         }
 215                 if (flags & PKCS7_REUSE_DIGEST)
 216                         {
 217                         if (!pkcs7_copy_existing_digest(p7, si))
 218                                 goto err;
 219                         if (!(flags & PKCS7_PARTIAL) &&
 220                                         !PKCS7_SIGNER_INFO_sign(si))
 221                                 goto err;
 222                         }
 223                 }
 224         return si;
 225         err:
 226         if (smcap)
 227                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 228         return NULL;
 229         }
 230
 231 /* Search for a digest matching SignerInfo digest type and if found
 232  * copy across.
 233  */
 234
 235 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 236         {
 237         int i;
 238         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 239         PKCS7_SIGNER_INFO *sitmp;
 240         ASN1_OCTET_STRING *osdig = NULL;
 241         sinfos = PKCS7_get_signer_info(p7);
 242         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 243                 {
 244                 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 245                 if (si == sitmp)
 246                         break;
 247                 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
 248                         continue;
 249                 if (!OBJ_cmp(si->digest_alg->algorithm,
 250                                 sitmp->digest_alg->algorithm))
 251                         {
 252                         osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
 253                         break;
 254                         }
 255
 256                 }
 257
 258         if (osdig)
 259                 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
 260
 261         PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
 262                         PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
 263         return 0;
 264         }
 265
 266 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 267                                         BIO *indata, BIO *out, int flags)
 268 {
 269         STACK_OF(X509) *signers;
 270         X509 *signer;
 271         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 272         PKCS7_SIGNER_INFO *si;
 273         X509_STORE_CTX cert_ctx;
 274         char buf[4096];
 275         int i, j=0, k, ret = 0;
 276         BIO *p7bio;
 277         BIO *tmpin, *tmpout;
 278
 279         if(!p7) {
 280                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 281                 return 0;
 282         }
 283
 284         if(!PKCS7_type_is_signed(p7)) {
 285                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 286                 return 0;
 287         }
 288
 289         /* Check for no data and no content: no data to verify signature */
 290         if(PKCS7_get_detached(p7) && !indata) {
 291                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 292                 return 0;
 293         }
 294 #if 0
 295         /* NB: this test commented out because some versions of Netscape
 296          * illegally include zero length content when signing data.
 297          */
 298
 299         /* Check for data and content: two sets of data */
 300         if(!PKCS7_get_detached(p7) && indata) {
 301                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 302                 return 0;
 303         }
 304 #endif
 305
 306         sinfos = PKCS7_get_signer_info(p7);
 307
 308         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 309                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 310                 return 0;
 311         }
 312
 313
 314         signers = PKCS7_get0_signers(p7, certs, flags);
 315
 316         if(!signers) return 0;
 317
 318         /* Now verify the certificates */
 319
 320         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 321                 signer = sk_X509_value (signers, k);
 322                 if (!(flags & PKCS7_NOCHAIN)) {
 323                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 324                                                         p7->d.sign->cert))
 325                                 {
 326                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 327                                 sk_X509_free(signers);
 328                                 return 0;
 329                                 }
 330                         X509_STORE_CTX_set_purpose(&cert_ctx,
 331                                                 X509_PURPOSE_SMIME_SIGN);
 332                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 333                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 334                         sk_X509_free(signers);
 335                         return 0;
 336                 }
 337                 if (!(flags & PKCS7_NOCRL))
 338                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 339                 i = X509_verify_cert(&cert_ctx);
 340                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 341                 X509_STORE_CTX_cleanup(&cert_ctx);
 342                 if (i <= 0) {
 343                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 344                         ERR_add_error_data(2, "Verify error:",
 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         /* Performance optimization: if the content is a memory BIO then
 353          * store its contents in a temporary read only memory BIO. This
 354          * avoids potentially large numbers of slow copies of data which will
 355          * occur when reading from a read write memory BIO when signatures
 356          * are calculated.
 357          */
 358
 359         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 360                 {
 361                 char *ptr;
 362                 long len;
 363                 len = BIO_get_mem_data(indata, &ptr);
 364                 tmpin = BIO_new_mem_buf(ptr, len);
 365                 if (tmpin == NULL)
 366                         {
 367                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 368                         return 0;
 369                         }
 370                 }
 371         else
 372                 tmpin = indata;
 373
 374
 375         if (!(p7bio=PKCS7_dataInit(p7,tmpin)))
 376                 goto err;
 377
 378         if(flags & PKCS7_TEXT) {
 379                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 380                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 381                         goto err;
 382                 }
 383                 BIO_set_mem_eof_return(tmpout, 0);
 384         } else tmpout = out;
 385
 386         /* We now have to 'read' from p7bio to calculate digests etc. */
 387         for (;;)
 388         {
 389                 i=BIO_read(p7bio,buf,sizeof(buf));
 390                 if (i <= 0) break;
 391                 if (tmpout) BIO_write(tmpout, buf, i);
 392         }
 393
 394         if(flags & PKCS7_TEXT) {
 395                 if(!SMIME_text(tmpout, out)) {
 396                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 397                         BIO_free(tmpout);
 398                         goto err;
 399                 }
 400                 BIO_free(tmpout);
 401         }
 402
 403         /* Now Verify All Signatures */
 404         if (!(flags & PKCS7_NOSIGS))
 405             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 406                 {
 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,PKCS7_R_SIGNATURE_FAILURE);
 412                         goto err;
 413                 }
 414         }
 415
 416         ret = 1;
 417
 418         err:
 419
 420         if (tmpin == indata)
 421                 {
 422                 if (indata) BIO_pop(p7bio);
 423                 }
 424         BIO_free_all(p7bio);
 425
 426         sk_X509_free(signers);
 427
 428         return ret;
 429 }
 430
 431 STACK_OF(X509) *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,PKCS7_R_INVALID_NULL_POINTER);
 442                 return NULL;
 443         }
 444
 445         if(!PKCS7_type_is_signed(p7)) {
 446                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 447                 return NULL;
 448         }
 449
 450         /* Collect all the signers together */
 451
 452         sinfos = PKCS7_get_signer_info(p7);
 453
 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         {
 466             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 467             ias = si->issuer_and_serial;
 468             signer = NULL;
 469                 /* If any certificates passed they take priority */
 470             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 471                                                 ias->issuer, ias->serial);
 472             if (!signer && !(flags & PKCS7_NOINTERN)
 473                         && p7->d.sign->cert) 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,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 478                         sk_X509_free(signers);
 479                         return 0;
 480             }
 481
 482             if (!sk_X509_push(signers, signer)) {
 483                 sk_X509_free(signers);
 484                 return NULL;
 485             }
 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         if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
 506                 goto err;
 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 (flags & PKCS7_STREAM)
 522                 return p7;
 523
 524         if (PKCS7_final(p7, in, flags))
 525                 return p7;
 526
 527         err:
 528
 529         BIO_free_all(p7bio);
 530         PKCS7_free(p7);
 531         return NULL;
 532
 533 }
 534
 535 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 536 {
 537         BIO *tmpmem;
 538         int ret, i;
 539         char buf[4096];
 540
 541         if(!p7) {
 542                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 543                 return 0;
 544         }
 545
 546         if(!PKCS7_type_is_enveloped(p7)) {
 547                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 548                 return 0;
 549         }
 550
 551         if(cert && !X509_check_private_key(cert, pkey)) {
 552                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 553                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 554                 return 0;
 555         }
 556
 557         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 558                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 559                 return 0;
 560         }
 561
 562         if (flags & PKCS7_TEXT) {
 563                 BIO *tmpbuf, *bread;
 564                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 565                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 566                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 567                         BIO_free_all(tmpmem);
 568                         return 0;
 569                 }
 570                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 571                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 572                         BIO_free_all(tmpbuf);
 573                         BIO_free_all(tmpmem);
 574                         return 0;
 575                 }
 576                 ret = SMIME_text(bread, data);
 577                 BIO_free_all(bread);
 578                 return ret;
 579         } else {
 580                 for(;;) {
 581                         i = BIO_read(tmpmem, buf, sizeof(buf));
 582                         if(i <= 0) break;
 583                         BIO_write(data, buf, i);
 584                 }
 585                 BIO_free_all(tmpmem);
 586                 return 1;
 587         }
 588 }