crypto/openssl/crypto/cms/cms_lib.c

   1 /* crypto/cms/cms_lib.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 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
  54 #include <openssl/asn1t.h>
  55 #include <openssl/x509.h>
  56 #include <openssl/err.h>
  57 #include <openssl/pem.h>
  58 #include <openssl/bio.h>
  59 #include <openssl/asn1.h>
  60 #include "cms.h"
  61 #include "cms_lcl.h"
  62
  63 IMPLEMENT_ASN1_FUNCTIONS_const(CMS_ContentInfo)
  64
  65 DECLARE_ASN1_ITEM(CMS_CertificateChoices)
  66 DECLARE_ASN1_ITEM(CMS_RevocationInfoChoice)
  67 DECLARE_STACK_OF(CMS_CertificateChoices)
  68 DECLARE_STACK_OF(CMS_RevocationInfoChoice)
  69
  70 const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms)
  71         {
  72         return cms->contentType;
  73         }
  74
  75 CMS_ContentInfo *cms_Data_create(void)
  76         {
  77         CMS_ContentInfo *cms;
  78         cms = CMS_ContentInfo_new();
  79         if (cms)
  80                 {
  81                 cms->contentType = OBJ_nid2obj(NID_pkcs7_data);
  82                 /* Never detached */
  83                 CMS_set_detached(cms, 0);
  84                 }
  85         return cms;
  86         }
  87
  88 BIO *cms_content_bio(CMS_ContentInfo *cms)
  89         {
  90         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
  91         if (!pos)
  92                 return NULL;
  93         /* If content detached data goes nowhere: create NULL BIO */
  94         if (!*pos)
  95                 return BIO_new(BIO_s_null());
  96         /* If content not detached and created return memory BIO
  97          */
  98         if (!*pos || ((*pos)->flags == ASN1_STRING_FLAG_CONT))
  99                 return BIO_new(BIO_s_mem());
 100         /* Else content was read in: return read only BIO for it */
 101         return BIO_new_mem_buf((*pos)->data, (*pos)->length);
 102         }
 103
 104 BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
 105         {
 106         BIO *cmsbio, *cont;
 107         if (icont)
 108                 cont = icont;
 109         else
 110                 cont = cms_content_bio(cms);
 111         if (!cont)
 112                 {
 113                 CMSerr(CMS_F_CMS_DATAINIT, CMS_R_NO_CONTENT);
 114                 return NULL;
 115                 }
 116         switch (OBJ_obj2nid(cms->contentType))
 117                 {
 118
 119                 case NID_pkcs7_data:
 120                 return cont;
 121
 122                 case NID_pkcs7_signed:
 123                 cmsbio = cms_SignedData_init_bio(cms);
 124                 break;
 125
 126                 case NID_pkcs7_digest:
 127                 cmsbio = cms_DigestedData_init_bio(cms);
 128                 break;
 129 #ifdef ZLIB
 130                 case NID_id_smime_ct_compressedData:
 131                 cmsbio = cms_CompressedData_init_bio(cms);
 132                 break;
 133 #endif
 134
 135                 case NID_pkcs7_encrypted:
 136                 cmsbio = cms_EncryptedData_init_bio(cms);
 137                 break;
 138
 139                 case NID_pkcs7_enveloped:
 140                 cmsbio = cms_EnvelopedData_init_bio(cms);
 141                 break;
 142
 143                 default:
 144                 CMSerr(CMS_F_CMS_DATAINIT, CMS_R_UNSUPPORTED_TYPE);
 145                 return NULL;
 146                 }
 147
 148         if (cmsbio)
 149                 return BIO_push(cmsbio, cont);
 150
 151         if (!icont)
 152                 BIO_free(cont);
 153         return NULL;
 154
 155         }
 156
 157 int CMS_dataFinal(CMS_ContentInfo *cms, BIO *cmsbio)
 158         {
 159         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 160         if (!pos)
 161                 return 0;
 162         /* If ebmedded content find memory BIO and set content */
 163         if (*pos && ((*pos)->flags & ASN1_STRING_FLAG_CONT))
 164                 {
 165                 BIO *mbio;
 166                 unsigned char *cont;
 167                 long contlen;
 168                 mbio = BIO_find_type(cmsbio, BIO_TYPE_MEM);
 169                 if (!mbio)
 170                         {
 171                         CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_CONTENT_NOT_FOUND);
 172                         return 0;
 173                         }
 174                 contlen = BIO_get_mem_data(mbio, &cont);
 175                 /* Set bio as read only so its content can't be clobbered */
 176                 BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY);
 177                 BIO_set_mem_eof_return(mbio, 0);
 178                 ASN1_STRING_set0(*pos, cont, contlen);
 179                 (*pos)->flags &= ~ASN1_STRING_FLAG_CONT;
 180                 }
 181
 182         switch (OBJ_obj2nid(cms->contentType))
 183                 {
 184
 185                 case NID_pkcs7_data:
 186                 case NID_pkcs7_enveloped:
 187                 case NID_pkcs7_encrypted:
 188                 case NID_id_smime_ct_compressedData:
 189                 /* Nothing to do */
 190                 return 1;
 191
 192                 case NID_pkcs7_signed:
 193                 return cms_SignedData_final(cms, cmsbio);
 194
 195                 case NID_pkcs7_digest:
 196                 return cms_DigestedData_do_final(cms, cmsbio, 0);
 197
 198                 default:
 199                 CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_UNSUPPORTED_TYPE);
 200                 return 0;
 201                 }
 202         }
 203
 204 /* Return an OCTET STRING pointer to content. This allows it to
 205  * be accessed or set later.
 206  */
 207
 208 ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms)
 209         {
 210         switch (OBJ_obj2nid(cms->contentType))
 211                 {
 212
 213                 case NID_pkcs7_data:
 214                 return &cms->d.data;
 215
 216                 case NID_pkcs7_signed:
 217                 return &cms->d.signedData->encapContentInfo->eContent;
 218
 219                 case NID_pkcs7_enveloped:
 220                 return &cms->d.envelopedData->encryptedContentInfo->encryptedContent;
 221
 222                 case NID_pkcs7_digest:
 223                 return &cms->d.digestedData->encapContentInfo->eContent;
 224
 225                 case NID_pkcs7_encrypted:
 226                 return &cms->d.encryptedData->encryptedContentInfo->encryptedContent;
 227
 228                 case NID_id_smime_ct_authData:
 229                 return &cms->d.authenticatedData->encapContentInfo->eContent;
 230
 231                 case NID_id_smime_ct_compressedData:
 232                 return &cms->d.compressedData->encapContentInfo->eContent;
 233
 234                 default:
 235                 if (cms->d.other->type == V_ASN1_OCTET_STRING)
 236                         return &cms->d.other->value.octet_string;
 237                 CMSerr(CMS_F_CMS_GET0_CONTENT, CMS_R_UNSUPPORTED_CONTENT_TYPE);
 238                 return NULL;
 239
 240                 }
 241         }
 242
 243 /* Return an ASN1_OBJECT pointer to content type. This allows it to
 244  * be accessed or set later.
 245  */
 246
 247 static ASN1_OBJECT **cms_get0_econtent_type(CMS_ContentInfo *cms)
 248         {
 249         switch (OBJ_obj2nid(cms->contentType))
 250                 {
 251
 252                 case NID_pkcs7_signed:
 253                 return &cms->d.signedData->encapContentInfo->eContentType;
 254
 255                 case NID_pkcs7_enveloped:
 256                 return &cms->d.envelopedData->encryptedContentInfo->contentType;
 257
 258                 case NID_pkcs7_digest:
 259                 return &cms->d.digestedData->encapContentInfo->eContentType;
 260
 261                 case NID_pkcs7_encrypted:
 262                 return &cms->d.encryptedData->encryptedContentInfo->contentType;
 263
 264                 case NID_id_smime_ct_authData:
 265                 return &cms->d.authenticatedData->encapContentInfo->eContentType;
 266
 267                 case NID_id_smime_ct_compressedData:
 268                 return &cms->d.compressedData->encapContentInfo->eContentType;
 269
 270                 default:
 271                 CMSerr(CMS_F_CMS_GET0_ECONTENT_TYPE,
 272                                         CMS_R_UNSUPPORTED_CONTENT_TYPE);
 273                 return NULL;
 274
 275                 }
 276         }
 277
 278 const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms)
 279         {
 280         ASN1_OBJECT **petype;
 281         petype = cms_get0_econtent_type(cms);
 282         if (petype)
 283                 return *petype;
 284         return NULL;
 285         }
 286
 287 int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid)
 288         {
 289         ASN1_OBJECT **petype, *etype;
 290         petype = cms_get0_econtent_type(cms);
 291         if (!petype)
 292                 return 0;
 293         if (!oid)
 294                 return 1;
 295         etype = OBJ_dup(oid);
 296         if (!etype)
 297                 return 0;
 298         ASN1_OBJECT_free(*petype);
 299         *petype = etype;
 300         return 1;
 301         }
 302
 303 int CMS_is_detached(CMS_ContentInfo *cms)
 304         {
 305         ASN1_OCTET_STRING **pos;
 306         pos = CMS_get0_content(cms);
 307         if (!pos)
 308                 return -1;
 309         if (*pos)
 310                 return 0;
 311         return 1;
 312         }
 313
 314 int CMS_set_detached(CMS_ContentInfo *cms, int detached)
 315         {
 316         ASN1_OCTET_STRING **pos;
 317         pos = CMS_get0_content(cms);
 318         if (!pos)
 319                 return 0;
 320         if (detached)
 321                 {
 322                 if (*pos)
 323                         {
 324                         ASN1_OCTET_STRING_free(*pos);
 325                         *pos = NULL;
 326                         }
 327                 return 1;
 328                 }
 329         if (!*pos)
 330                 *pos = ASN1_OCTET_STRING_new();
 331         if (*pos)
 332                 {
 333                 /* NB: special flag to show content is created and not
 334                  * read in.
 335                  */
 336                 (*pos)->flags |= ASN1_STRING_FLAG_CONT;
 337                 return 1;
 338                 }
 339         CMSerr(CMS_F_CMS_SET_DETACHED, ERR_R_MALLOC_FAILURE);
 340         return 0;
 341         }
 342
 343 /* Set up an X509_ALGOR DigestAlgorithmIdentifier from an EVP_MD */
 344
 345 void cms_DigestAlgorithm_set(X509_ALGOR *alg, const EVP_MD *md)
 346         {
 347         int param_type;
 348
 349         switch (EVP_MD_type(md))
 350                 {
 351                 case NID_sha1:
 352                 case NID_sha224:
 353                 case NID_sha256:
 354                 case NID_sha384:
 355                 case NID_sha512:
 356                 param_type = V_ASN1_UNDEF;
 357                 break;
 358
 359                 default:
 360                 param_type = V_ASN1_NULL;
 361                 break;
 362                 }
 363
 364         X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_type(md)), param_type, NULL);
 365
 366         }
 367
 368 /* Create a digest BIO from an X509_ALGOR structure */
 369
 370 BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm)
 371         {
 372         BIO *mdbio = NULL;
 373         ASN1_OBJECT *digestoid;
 374         const EVP_MD *digest;
 375         X509_ALGOR_get0(&digestoid, NULL, NULL, digestAlgorithm);
 376         digest = EVP_get_digestbyobj(digestoid);
 377         if (!digest)
 378                 {
 379                 CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
 380                                 CMS_R_UNKNOWN_DIGEST_ALGORIHM);
 381                 goto err;
 382                 }
 383         mdbio = BIO_new(BIO_f_md());
 384         if (!mdbio || !BIO_set_md(mdbio, digest))
 385                 {
 386                 CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
 387                                 CMS_R_MD_BIO_INIT_ERROR);
 388                 goto err;
 389                 }
 390         return mdbio;
 391         err:
 392         if (mdbio)
 393                 BIO_free(mdbio);
 394         return NULL;
 395         }
 396
 397 /* Locate a message digest content from a BIO chain based on SignerInfo */
 398
 399 int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
 400                                         X509_ALGOR *mdalg)
 401         {
 402         int nid;
 403         ASN1_OBJECT *mdoid;
 404         X509_ALGOR_get0(&mdoid, NULL, NULL, mdalg);
 405         nid = OBJ_obj2nid(mdoid);
 406         /* Look for digest type to match signature */
 407         for (;;)
 408                 {
 409                 EVP_MD_CTX *mtmp;
 410                 chain = BIO_find_type(chain, BIO_TYPE_MD);
 411                 if (chain == NULL)
 412                         {
 413                         CMSerr(CMS_F_CMS_DIGESTALGORITHM_FIND_CTX,
 414                                                 CMS_R_NO_MATCHING_DIGEST);
 415                         return 0;
 416                         }
 417                 BIO_get_md_ctx(chain, &mtmp);
 418                 if (EVP_MD_CTX_type(mtmp) == nid
 419                 /* Workaround for broken implementations that use signature
 420                  * algorithm  OID instead of digest.
 421                  */
 422                         || EVP_MD_pkey_type(EVP_MD_CTX_md(mtmp)) == nid)
 423                         {
 424                         EVP_MD_CTX_copy_ex(mctx, mtmp);
 425                         return 1;
 426                         }
 427                 chain = BIO_next(chain);
 428                 }
 429         }
 430
 431 static STACK_OF(CMS_CertificateChoices) **cms_get0_certificate_choices(CMS_ContentInfo *cms)
 432         {
 433         switch (OBJ_obj2nid(cms->contentType))
 434                 {
 435
 436                 case NID_pkcs7_signed:
 437                 return &cms->d.signedData->certificates;
 438
 439                 case NID_pkcs7_enveloped:
 440                 return &cms->d.envelopedData->originatorInfo->certificates;
 441
 442                 default:
 443                 CMSerr(CMS_F_CMS_GET0_CERTIFICATE_CHOICES,
 444                                         CMS_R_UNSUPPORTED_CONTENT_TYPE);
 445                 return NULL;
 446
 447                 }
 448         }
 449
 450 CMS_CertificateChoices *CMS_add0_CertificateChoices(CMS_ContentInfo *cms)
 451         {
 452         STACK_OF(CMS_CertificateChoices) **pcerts;
 453         CMS_CertificateChoices *cch;
 454         pcerts = cms_get0_certificate_choices(cms);
 455         if (!pcerts)
 456                 return NULL;
 457         if (!*pcerts)
 458                 *pcerts = sk_CMS_CertificateChoices_new_null();
 459         if (!*pcerts)
 460                 return NULL;
 461         cch = M_ASN1_new_of(CMS_CertificateChoices);
 462         if (!cch)
 463                 return NULL;
 464         if (!sk_CMS_CertificateChoices_push(*pcerts, cch))
 465                 {
 466                 M_ASN1_free_of(cch, CMS_CertificateChoices);
 467                 return NULL;
 468                 }
 469         return cch;
 470         }
 471
 472 int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert)
 473         {
 474         CMS_CertificateChoices *cch;
 475         STACK_OF(CMS_CertificateChoices) **pcerts;
 476         int i;
 477         pcerts = cms_get0_certificate_choices(cms);
 478         if (!pcerts)
 479                 return 0;
 480         if (!pcerts)
 481                 return 0;
 482         for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++)
 483                 {
 484                 cch = sk_CMS_CertificateChoices_value(*pcerts, i);
 485                 if (cch->type == CMS_CERTCHOICE_CERT)
 486                         {
 487                         if (!X509_cmp(cch->d.certificate, cert))
 488                                 {
 489                                 CMSerr(CMS_F_CMS_ADD0_CERT,
 490                                         CMS_R_CERTIFICATE_ALREADY_PRESENT);
 491                                 return 0;
 492                                 }
 493                         }
 494                 }
 495         cch = CMS_add0_CertificateChoices(cms);
 496         if (!cch)
 497                 return 0;
 498         cch->type = CMS_CERTCHOICE_CERT;
 499         cch->d.certificate = cert;
 500         return 1;
 501         }
 502
 503 int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert)
 504         {
 505         int r;
 506         r = CMS_add0_cert(cms, cert);
 507         if (r > 0)
 508                 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
 509         return r;
 510         }
 511
 512 static STACK_OF(CMS_RevocationInfoChoice) **cms_get0_revocation_choices(CMS_ContentInfo *cms)
 513         {
 514         switch (OBJ_obj2nid(cms->contentType))
 515                 {
 516
 517                 case NID_pkcs7_signed:
 518                 return &cms->d.signedData->crls;
 519
 520                 case NID_pkcs7_enveloped:
 521                 return &cms->d.envelopedData->originatorInfo->crls;
 522
 523                 default:
 524                 CMSerr(CMS_F_CMS_GET0_REVOCATION_CHOICES,
 525                                         CMS_R_UNSUPPORTED_CONTENT_TYPE);
 526                 return NULL;
 527
 528                 }
 529         }
 530
 531 CMS_RevocationInfoChoice *CMS_add0_RevocationInfoChoice(CMS_ContentInfo *cms)
 532         {
 533         STACK_OF(CMS_RevocationInfoChoice) **pcrls;
 534         CMS_RevocationInfoChoice *rch;
 535         pcrls = cms_get0_revocation_choices(cms);
 536         if (!pcrls)
 537                 return NULL;
 538         if (!*pcrls)
 539                 *pcrls = sk_CMS_RevocationInfoChoice_new_null();
 540         if (!*pcrls)
 541                 return NULL;
 542         rch = M_ASN1_new_of(CMS_RevocationInfoChoice);
 543         if (!rch)
 544                 return NULL;
 545         if (!sk_CMS_RevocationInfoChoice_push(*pcrls, rch))
 546                 {
 547                 M_ASN1_free_of(rch, CMS_RevocationInfoChoice);
 548                 return NULL;
 549                 }
 550         return rch;
 551         }
 552
 553 int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl)
 554         {
 555         CMS_RevocationInfoChoice *rch;
 556         rch = CMS_add0_RevocationInfoChoice(cms);
 557         if (!rch)
 558                 return 0;
 559         rch->type = CMS_REVCHOICE_CRL;
 560         rch->d.crl = crl;
 561         return 1;
 562         }
 563
 564 STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms)
 565         {
 566         STACK_OF(X509) *certs = NULL;
 567         CMS_CertificateChoices *cch;
 568         STACK_OF(CMS_CertificateChoices) **pcerts;
 569         int i;
 570         pcerts = cms_get0_certificate_choices(cms);
 571         if (!pcerts)
 572                 return NULL;
 573         for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++)
 574                 {
 575                 cch = sk_CMS_CertificateChoices_value(*pcerts, i);
 576                 if (cch->type == 0)
 577                         {
 578                         if (!certs)
 579                                 {
 580                                 certs = sk_X509_new_null();
 581                                 if (!certs)
 582                                         return NULL;
 583                                 }
 584                         if (!sk_X509_push(certs, cch->d.certificate))
 585                                 {
 586                                 sk_X509_pop_free(certs, X509_free);
 587                                 return NULL;
 588                                 }
 589                         CRYPTO_add(&cch->d.certificate->references,
 590                                                 1, CRYPTO_LOCK_X509);
 591                         }
 592                 }
 593         return certs;
 594
 595         }
 596
 597 STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms)
 598         {
 599         STACK_OF(X509_CRL) *crls = NULL;
 600         STACK_OF(CMS_RevocationInfoChoice) **pcrls;
 601         CMS_RevocationInfoChoice *rch;
 602         int i;
 603         pcrls = cms_get0_revocation_choices(cms);
 604         if (!pcrls)
 605                 return NULL;
 606         for (i = 0; i < sk_CMS_RevocationInfoChoice_num(*pcrls); i++)
 607                 {
 608                 rch = sk_CMS_RevocationInfoChoice_value(*pcrls, i);
 609                 if (rch->type == 0)
 610                         {
 611                         if (!crls)
 612                                 {
 613                                 crls = sk_X509_CRL_new_null();
 614                                 if (!crls)
 615                                         return NULL;
 616                                 }
 617                         if (!sk_X509_CRL_push(crls, rch->d.crl))
 618                                 {
 619                                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 620                                 return NULL;
 621                                 }
 622                         CRYPTO_add(&rch->d.crl->references,
 623                                                 1, CRYPTO_LOCK_X509_CRL);
 624                         }
 625                 }
 626         return crls;
 627         }