release/src/router/openssl/crypto/pkcs7/pk7_smime.c

   1 /* pk7_smime.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 /* Simple PKCS#7 processing functions */
  61
  62 #include <stdio.h>
  63 #include "cryptlib.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 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
  70                   BIO *data, int flags)
  71 {
  72     PKCS7 *p7;
  73     int i;
  74
  75     if (!(p7 = PKCS7_new())) {
  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         PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
  88         goto err;
  89     }
  90
  91     if (!(flags & PKCS7_NOCERTS)) {
  92         for (i = 0; i < sk_X509_num(certs); i++) {
  93             if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
  94                 goto err;
  95         }
  96     }
  97
  98     if (flags & PKCS7_DETACHED)
  99         PKCS7_set_detached(p7, 1);
 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         PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
 118         return 0;
 119     }
 120
 121     SMIME_crlf_copy(data, p7bio, flags);
 122
 123     (void)BIO_flush(p7bio);
 124
 125     if (!PKCS7_dataFinal(p7, p7bio)) {
 126         PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
 127         goto err;
 128     }
 129
 130     ret = 1;
 131
 132  err:
 133     BIO_free_all(p7bio);
 134
 135     return ret;
 136
 137 }
 138
 139 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 140
 141 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 142 {
 143     if (EVP_get_cipherbynid(nid))
 144         return PKCS7_simple_smimecap(sk, nid, arg);
 145     return 1;
 146 }
 147
 148 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 149 {
 150     if (EVP_get_digestbynid(nid))
 151         return PKCS7_simple_smimecap(sk, nid, arg);
 152     return 1;
 153 }
 154
 155 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
 156                                          EVP_PKEY *pkey, const EVP_MD *md,
 157                                          int flags)
 158 {
 159     PKCS7_SIGNER_INFO *si = NULL;
 160     STACK_OF(X509_ALGOR) *smcap = NULL;
 161     if (!X509_check_private_key(signcert, pkey)) {
 162         PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 163                  PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 164         return NULL;
 165     }
 166
 167     if (!(si = PKCS7_add_signature(p7, signcert, pkey, md))) {
 168         PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 169                  PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
 170         return NULL;
 171     }
 172
 173     if (!(flags & PKCS7_NOCERTS)) {
 174         if (!PKCS7_add_certificate(p7, signcert))
 175             goto err;
 176     }
 177
 178     if (!(flags & PKCS7_NOATTR)) {
 179         if (!PKCS7_add_attrib_content_type(si, NULL))
 180             goto err;
 181         /* Add SMIMECapabilities */
 182         if (!(flags & PKCS7_NOSMIMECAP)) {
 183             if (!(smcap = sk_X509_ALGOR_new_null())) {
 184                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
 185                 goto err;
 186             }
 187             if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 188                 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 189                 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 190                 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 191                 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 192                 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 193                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 194                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 195                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
 196                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
 197                 || !PKCS7_add_attrib_smimecap(si, smcap))
 198                 goto err;
 199             sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 200             smcap = NULL;
 201         }
 202         if (flags & PKCS7_REUSE_DIGEST) {
 203             if (!pkcs7_copy_existing_digest(p7, si))
 204                 goto err;
 205             if (!(flags & PKCS7_PARTIAL) && !PKCS7_SIGNER_INFO_sign(si))
 206                 goto err;
 207         }
 208     }
 209     return si;
 210  err:
 211     if (smcap)
 212         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 213     return NULL;
 214 }
 215
 216 /*
 217  * Search for a digest matching SignerInfo digest type and if found copy
 218  * across.
 219  */
 220
 221 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 222 {
 223     int i;
 224     STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 225     PKCS7_SIGNER_INFO *sitmp;
 226     ASN1_OCTET_STRING *osdig = NULL;
 227     sinfos = PKCS7_get_signer_info(p7);
 228     for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
 229         sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 230         if (si == sitmp)
 231             break;
 232         if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
 233             continue;
 234         if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
 235             osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
 236             break;
 237         }
 238
 239     }
 240
 241     if (osdig)
 242         return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
 243
 244     PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
 245              PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
 246     return 0;
 247 }
 248
 249 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 250                  BIO *indata, BIO *out, int flags)
 251 {
 252     STACK_OF(X509) *signers;
 253     X509 *signer;
 254     STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 255     PKCS7_SIGNER_INFO *si;
 256     X509_STORE_CTX cert_ctx;
 257     char buf[4096];
 258     int i, j = 0, k, ret = 0;
 259     BIO *p7bio = NULL;
 260     BIO *tmpin = NULL, *tmpout = NULL;
 261
 262     if (!p7) {
 263         PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
 264         return 0;
 265     }
 266
 267     if (!PKCS7_type_is_signed(p7)) {
 268         PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_WRONG_CONTENT_TYPE);
 269         return 0;
 270     }
 271
 272     /* Check for no data and no content: no data to verify signature */
 273     if (PKCS7_get_detached(p7) && !indata) {
 274         PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_CONTENT);
 275         return 0;
 276     }
 277 #if 0
 278     /*
 279      * NB: this test commented out because some versions of Netscape
 280      * illegally include zero length content when signing data. Also
 281      * Microsoft Authenticode includes a SpcIndirectDataContent data
 282      * structure which describes the content to be protected by the
 283      * signature, rather than directly embedding that content. So
 284      * Authenticode implementations are also expected to use
 285      * PKCS7_verify() with explicit external data, on non-detached
 286      * PKCS#7 signatures.
 287      *
 288      * In OpenSSL 1.1 a new flag PKCS7_NO_DUAL_CONTENT has been
 289      * introduced to disable this sanity check. For the 1.0.2 branch
 290      * this change is not acceptable, so the check remains completely
 291      * commented out (as it has been for a long time).
 292      */
 293
 294     /* Check for data and content: two sets of data */
 295     if (!PKCS7_get_detached(p7) && indata) {
 296         PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
 297         return 0;
 298     }
 299 #endif
 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     signers = PKCS7_get0_signers(p7, certs, flags);
 309     if (!signers)
 310         return 0;
 311
 312     /* Now verify the certificates */
 313
 314     if (!(flags & PKCS7_NOVERIFY))
 315         for (k = 0; k < sk_X509_num(signers); k++) {
 316             signer = sk_X509_value(signers, k);
 317             if (!(flags & PKCS7_NOCHAIN)) {
 318                 if (!X509_STORE_CTX_init(&cert_ctx, store, signer,
 319                                          p7->d.sign->cert)) {
 320                     PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
 321                     goto err;
 322                 }
 323                 X509_STORE_CTX_set_default(&cert_ctx, "smime_sign");
 324             } else if (!X509_STORE_CTX_init(&cert_ctx, store, signer, NULL)) {
 325                 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
 326                 goto err;
 327             }
 328             if (!(flags & PKCS7_NOCRL))
 329                 X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 330             i = X509_verify_cert(&cert_ctx);
 331             if (i <= 0)
 332                 j = X509_STORE_CTX_get_error(&cert_ctx);
 333             X509_STORE_CTX_cleanup(&cert_ctx);
 334             if (i <= 0) {
 335                 PKCS7err(PKCS7_F_PKCS7_VERIFY,
 336                          PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 337                 ERR_add_error_data(2, "Verify error:",
 338                                    X509_verify_cert_error_string(j));
 339                 goto err;
 340             }
 341             /* Check for revocation status here */
 342         }
 343
 344     /*
 345      * Performance optimization: if the content is a memory BIO then store
 346      * its contents in a temporary read only memory BIO. This avoids
 347      * potentially large numbers of slow copies of data which will occur when
 348      * reading from a read write memory BIO when signatures are calculated.
 349      */
 350
 351     if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
 352         char *ptr;
 353         long len;
 354         len = BIO_get_mem_data(indata, &ptr);
 355         tmpin = BIO_new_mem_buf(ptr, len);
 356         if (tmpin == NULL) {
 357             PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
 358             goto err;
 359         }
 360     } else
 361         tmpin = indata;
 362
 363     if (!(p7bio = PKCS7_dataInit(p7, tmpin)))
 364         goto err;
 365
 366     if (flags & PKCS7_TEXT) {
 367         if (!(tmpout = BIO_new(BIO_s_mem()))) {
 368             PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
 369             goto err;
 370         }
 371         BIO_set_mem_eof_return(tmpout, 0);
 372     } else
 373         tmpout = out;
 374
 375     /* We now have to 'read' from p7bio to calculate digests etc. */
 376     for (;;) {
 377         i = BIO_read(p7bio, buf, sizeof(buf));
 378         if (i <= 0)
 379             break;
 380         if (tmpout)
 381             BIO_write(tmpout, buf, i);
 382     }
 383
 384     if (flags & PKCS7_TEXT) {
 385         if (!SMIME_text(tmpout, out)) {
 386             PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SMIME_TEXT_ERROR);
 387             BIO_free(tmpout);
 388             goto err;
 389         }
 390         BIO_free(tmpout);
 391     }
 392
 393     /* Now Verify All Signatures */
 394     if (!(flags & PKCS7_NOSIGS))
 395         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
 396             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 397             signer = sk_X509_value(signers, i);
 398             j = PKCS7_signatureVerify(p7bio, p7, si, signer);
 399             if (j <= 0) {
 400                 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SIGNATURE_FAILURE);
 401                 goto err;
 402             }
 403         }
 404
 405     ret = 1;
 406
 407  err:
 408     if (tmpin == indata) {
 409         if (indata)
 410             BIO_pop(p7bio);
 411     }
 412     BIO_free_all(p7bio);
 413     sk_X509_free(signers);
 414     return ret;
 415 }
 416
 417 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
 418                                    int flags)
 419 {
 420     STACK_OF(X509) *signers;
 421     STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 422     PKCS7_SIGNER_INFO *si;
 423     PKCS7_ISSUER_AND_SERIAL *ias;
 424     X509 *signer;
 425     int i;
 426
 427     if (!p7) {
 428         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
 429         return NULL;
 430     }
 431
 432     if (!PKCS7_type_is_signed(p7)) {
 433         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
 434         return NULL;
 435     }
 436
 437     /* Collect all the signers together */
 438
 439     sinfos = PKCS7_get_signer_info(p7);
 440
 441     if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 442         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
 443         return 0;
 444     }
 445
 446     if (!(signers = sk_X509_new_null())) {
 447         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
 448         return NULL;
 449     }
 450
 451     for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
 452         si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 453         ias = si->issuer_and_serial;
 454         signer = NULL;
 455         /* If any certificates passed they take priority */
 456         if (certs)
 457             signer = X509_find_by_issuer_and_serial(certs,
 458                                                     ias->issuer, ias->serial);
 459         if (!signer && !(flags & PKCS7_NOINTERN)
 460             && p7->d.sign->cert)
 461             signer =
 462                 X509_find_by_issuer_and_serial(p7->d.sign->cert,
 463                                                ias->issuer, ias->serial);
 464         if (!signer) {
 465             PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
 466                      PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 467             sk_X509_free(signers);
 468             return 0;
 469         }
 470
 471         if (!sk_X509_push(signers, signer)) {
 472             sk_X509_free(signers);
 473             return NULL;
 474         }
 475     }
 476     return signers;
 477 }
 478
 479 /* Build a complete PKCS#7 enveloped data */
 480
 481 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 482                      int flags)
 483 {
 484     PKCS7 *p7;
 485     BIO *p7bio = NULL;
 486     int i;
 487     X509 *x509;
 488     if (!(p7 = PKCS7_new())) {
 489         PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
 490         return NULL;
 491     }
 492
 493     if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
 494         goto err;
 495     if (!PKCS7_set_cipher(p7, cipher)) {
 496         PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER);
 497         goto err;
 498     }
 499
 500     for (i = 0; i < sk_X509_num(certs); i++) {
 501         x509 = sk_X509_value(certs, i);
 502         if (!PKCS7_add_recipient(p7, x509)) {
 503             PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_ADDING_RECIPIENT);
 504             goto err;
 505         }
 506     }
 507
 508     if (flags & PKCS7_STREAM)
 509         return p7;
 510
 511     if (PKCS7_final(p7, in, flags))
 512         return p7;
 513
 514  err:
 515
 516     BIO_free_all(p7bio);
 517     PKCS7_free(p7);
 518     return NULL;
 519
 520 }
 521
 522 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 523 {
 524     BIO *tmpmem;
 525     int ret, i;
 526     char buf[4096];
 527
 528     if (!p7) {
 529         PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
 530         return 0;
 531     }
 532
 533     if (!PKCS7_type_is_enveloped(p7)) {
 534         PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
 535         return 0;
 536     }
 537
 538     if (cert && !X509_check_private_key(cert, pkey)) {
 539         PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 540                  PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 541         return 0;
 542     }
 543
 544     if (!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 545         PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 546         return 0;
 547     }
 548
 549     if (flags & PKCS7_TEXT) {
 550         BIO *tmpbuf, *bread;
 551         /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 552         if (!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 553             PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 554             BIO_free_all(tmpmem);
 555             return 0;
 556         }
 557         if (!(bread = BIO_push(tmpbuf, tmpmem))) {
 558             PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 559             BIO_free_all(tmpbuf);
 560             BIO_free_all(tmpmem);
 561             return 0;
 562         }
 563         ret = SMIME_text(bread, data);
 564         if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
 565             if (!BIO_get_cipher_status(tmpmem))
 566                 ret = 0;
 567         }
 568         BIO_free_all(bread);
 569         return ret;
 570     } else {
 571         for (;;) {
 572             i = BIO_read(tmpmem, buf, sizeof(buf));
 573             if (i <= 0) {
 574                 ret = 1;
 575                 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
 576                     if (!BIO_get_cipher_status(tmpmem))
 577                         ret = 0;
 578                 }
 579
 580                 break;
 581             }
 582             if (BIO_write(data, buf, i) != i) {
 583                 ret = 0;
 584                 break;
 585             }
 586         }
 587         BIO_free_all(tmpmem);
 588         return ret;
 589     }
 590 }