crypto/cms/cms_lib.c

   1 /*
   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/x509v3.h>
  56 #include <openssl/err.h>
  57 #include <openssl/pem.h>
  58 #include <openssl/bio.h>
  59 #include <openssl/asn1.h>
  60 #include <openssl/cms.h>
  61 #include "cms_lcl.h"
  62
  63 IMPLEMENT_ASN1_FUNCTIONS(CMS_ContentInfo)
  64 IMPLEMENT_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
  65
  66 const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms)
  67 {
  68     return cms->contentType;
  69 }
  70
  71 CMS_ContentInfo *cms_Data_create(void)
  72 {
  73     CMS_ContentInfo *cms;
  74     cms = CMS_ContentInfo_new();
  75     if (cms != NULL) {
  76         cms->contentType = OBJ_nid2obj(NID_pkcs7_data);
  77         /* Never detached */
  78         CMS_set_detached(cms, 0);
  79     }
  80     return cms;
  81 }
  82
  83 BIO *cms_content_bio(CMS_ContentInfo *cms)
  84 {
  85     ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
  86     if (!pos)
  87         return NULL;
  88     /* If content detached data goes nowhere: create NULL BIO */
  89     if (!*pos)
  90         return BIO_new(BIO_s_null());
  91     /*
  92      * If content not detached and created return memory BIO
  93      */
  94     if (!*pos || ((*pos)->flags == ASN1_STRING_FLAG_CONT))
  95         return BIO_new(BIO_s_mem());
  96     /* Else content was read in: return read only BIO for it */
  97     return BIO_new_mem_buf((*pos)->data, (*pos)->length);
  98 }
  99
 100 BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
 101 {
 102     BIO *cmsbio, *cont;
 103     if (icont)
 104         cont = icont;
 105     else
 106         cont = cms_content_bio(cms);
 107     if (!cont) {
 108         CMSerr(CMS_F_CMS_DATAINIT, CMS_R_NO_CONTENT);
 109         return NULL;
 110     }
 111     switch (OBJ_obj2nid(cms->contentType)) {
 112
 113     case NID_pkcs7_data:
 114         return cont;
 115
 116     case NID_pkcs7_signed:
 117         cmsbio = cms_SignedData_init_bio(cms);
 118         break;
 119
 120     case NID_pkcs7_digest:
 121         cmsbio = cms_DigestedData_init_bio(cms);
 122         break;
 123 #ifdef ZLIB
 124     case NID_id_smime_ct_compressedData:
 125         cmsbio = cms_CompressedData_init_bio(cms);
 126         break;
 127 #endif
 128
 129     case NID_pkcs7_encrypted:
 130         cmsbio = cms_EncryptedData_init_bio(cms);
 131         break;
 132
 133     case NID_pkcs7_enveloped:
 134         cmsbio = cms_EnvelopedData_init_bio(cms);
 135         break;
 136
 137     default:
 138         CMSerr(CMS_F_CMS_DATAINIT, CMS_R_UNSUPPORTED_TYPE);
 139         return NULL;
 140     }
 141
 142     if (cmsbio)
 143         return BIO_push(cmsbio, cont);
 144
 145     if (!icont)
 146         BIO_free(cont);
 147     return NULL;
 148
 149 }
 150
 151 int CMS_dataFinal(CMS_ContentInfo *cms, BIO *cmsbio)
 152 {
 153     ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 154     if (!pos)
 155         return 0;
 156     /* If ebmedded content find memory BIO and set content */
 157     if (*pos && ((*pos)->flags & ASN1_STRING_FLAG_CONT)) {
 158         BIO *mbio;
 159         unsigned char *cont;
 160         long contlen;
 161         mbio = BIO_find_type(cmsbio, BIO_TYPE_MEM);
 162         if (!mbio) {
 163             CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_CONTENT_NOT_FOUND);
 164             return 0;
 165         }
 166         contlen = BIO_get_mem_data(mbio, &cont);
 167         /* Set bio as read only so its content can't be clobbered */
 168         BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY);
 169         BIO_set_mem_eof_return(mbio, 0);
 170         ASN1_STRING_set0(*pos, cont, contlen);
 171         (*pos)->flags &= ~ASN1_STRING_FLAG_CONT;
 172     }
 173
 174     switch (OBJ_obj2nid(cms->contentType)) {
 175
 176     case NID_pkcs7_data:
 177     case NID_pkcs7_enveloped:
 178     case NID_pkcs7_encrypted:
 179     case NID_id_smime_ct_compressedData:
 180         /* Nothing to do */
 181         return 1;
 182
 183     case NID_pkcs7_signed:
 184         return cms_SignedData_final(cms, cmsbio);
 185
 186     case NID_pkcs7_digest:
 187         return cms_DigestedData_do_final(cms, cmsbio, 0);
 188
 189     default:
 190         CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_UNSUPPORTED_TYPE);
 191         return 0;
 192     }
 193 }
 194
 195 /*
 196  * Return an OCTET STRING pointer to content. This allows it to be accessed
 197  * or set later.
 198  */
 199
 200 ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms)
 201 {
 202     switch (OBJ_obj2nid(cms->contentType)) {
 203
 204     case NID_pkcs7_data:
 205         return &cms->d.data;
 206
 207     case NID_pkcs7_signed:
 208         return &cms->d.signedData->encapContentInfo->eContent;
 209
 210     case NID_pkcs7_enveloped:
 211         return &cms->d.envelopedData->encryptedContentInfo->encryptedContent;
 212
 213     case NID_pkcs7_digest:
 214         return &cms->d.digestedData->encapContentInfo->eContent;
 215
 216     case NID_pkcs7_encrypted:
 217         return &cms->d.encryptedData->encryptedContentInfo->encryptedContent;
 218
 219     case NID_id_smime_ct_authData:
 220         return &cms->d.authenticatedData->encapContentInfo->eContent;
 221
 222     case NID_id_smime_ct_compressedData:
 223         return &cms->d.compressedData->encapContentInfo->eContent;
 224
 225     default:
 226         if (cms->d.other->type == V_ASN1_OCTET_STRING)
 227             return &cms->d.other->value.octet_string;
 228         CMSerr(CMS_F_CMS_GET0_CONTENT, CMS_R_UNSUPPORTED_CONTENT_TYPE);
 229         return NULL;
 230
 231     }
 232 }
 233
 234 /*
 235  * Return an ASN1_OBJECT pointer to content type. This allows it to be
 236  * accessed or set later.
 237  */
 238
 239 static ASN1_OBJECT **cms_get0_econtent_type(CMS_ContentInfo *cms)
 240 {
 241     switch (OBJ_obj2nid(cms->contentType)) {
 242
 243     case NID_pkcs7_signed:
 244         return &cms->d.signedData->encapContentInfo->eContentType;
 245
 246     case NID_pkcs7_enveloped:
 247         return &cms->d.envelopedData->encryptedContentInfo->contentType;
 248
 249     case NID_pkcs7_digest:
 250         return &cms->d.digestedData->encapContentInfo->eContentType;
 251
 252     case NID_pkcs7_encrypted:
 253         return &cms->d.encryptedData->encryptedContentInfo->contentType;
 254
 255     case NID_id_smime_ct_authData:
 256         return &cms->d.authenticatedData->encapContentInfo->eContentType;
 257
 258     case NID_id_smime_ct_compressedData:
 259         return &cms->d.compressedData->encapContentInfo->eContentType;
 260
 261     default:
 262         CMSerr(CMS_F_CMS_GET0_ECONTENT_TYPE, CMS_R_UNSUPPORTED_CONTENT_TYPE);
 263         return NULL;
 264
 265     }
 266 }
 267
 268 const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms)
 269 {
 270     ASN1_OBJECT **petype;
 271     petype = cms_get0_econtent_type(cms);
 272     if (petype)
 273         return *petype;
 274     return NULL;
 275 }
 276
 277 int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid)
 278 {
 279     ASN1_OBJECT **petype, *etype;
 280     petype = cms_get0_econtent_type(cms);
 281     if (!petype)
 282         return 0;
 283     if (!oid)
 284         return 1;
 285     etype = OBJ_dup(oid);
 286     if (!etype)
 287         return 0;
 288     ASN1_OBJECT_free(*petype);
 289     *petype = etype;
 290     return 1;
 291 }
 292
 293 int CMS_is_detached(CMS_ContentInfo *cms)
 294 {
 295     ASN1_OCTET_STRING **pos;
 296     pos = CMS_get0_content(cms);
 297     if (!pos)
 298         return -1;
 299     if (*pos)
 300         return 0;
 301     return 1;
 302 }
 303
 304 int CMS_set_detached(CMS_ContentInfo *cms, int detached)
 305 {
 306     ASN1_OCTET_STRING **pos;
 307     pos = CMS_get0_content(cms);
 308     if (!pos)
 309         return 0;
 310     if (detached) {
 311         ASN1_OCTET_STRING_free(*pos);
 312         *pos = NULL;
 313         return 1;
 314     }
 315     if (*pos == NULL)
 316         *pos = ASN1_OCTET_STRING_new();
 317     if (*pos != NULL) {
 318         /*
 319          * NB: special flag to show content is created and not read in.
 320          */
 321         (*pos)->flags |= ASN1_STRING_FLAG_CONT;
 322         return 1;
 323     }
 324     CMSerr(CMS_F_CMS_SET_DETACHED, ERR_R_MALLOC_FAILURE);
 325     return 0;
 326 }
 327
 328 /* Create a digest BIO from an X509_ALGOR structure */
 329
 330 BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm)
 331 {
 332     BIO *mdbio = NULL;
 333     ASN1_OBJECT *digestoid;
 334     const EVP_MD *digest;
 335     X509_ALGOR_get0(&digestoid, NULL, NULL, digestAlgorithm);
 336     digest = EVP_get_digestbyobj(digestoid);
 337     if (!digest) {
 338         CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
 339                CMS_R_UNKNOWN_DIGEST_ALGORIHM);
 340         goto err;
 341     }
 342     mdbio = BIO_new(BIO_f_md());
 343     if (mdbio == NULL || !BIO_set_md(mdbio, digest)) {
 344         CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO, CMS_R_MD_BIO_INIT_ERROR);
 345         goto err;
 346     }
 347     return mdbio;
 348  err:
 349     BIO_free(mdbio);
 350     return NULL;
 351 }
 352
 353 /* Locate a message digest content from a BIO chain based on SignerInfo */
 354
 355 int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
 356                                  X509_ALGOR *mdalg)
 357 {
 358     int nid;
 359     ASN1_OBJECT *mdoid;
 360     X509_ALGOR_get0(&mdoid, NULL, NULL, mdalg);
 361     nid = OBJ_obj2nid(mdoid);
 362     /* Look for digest type to match signature */
 363     for (;;) {
 364         EVP_MD_CTX *mtmp;
 365         chain = BIO_find_type(chain, BIO_TYPE_MD);
 366         if (chain == NULL) {
 367             CMSerr(CMS_F_CMS_DIGESTALGORITHM_FIND_CTX,
 368                    CMS_R_NO_MATCHING_DIGEST);
 369             return 0;
 370         }
 371         BIO_get_md_ctx(chain, &mtmp);
 372         if (EVP_MD_CTX_type(mtmp) == nid
 373             /*
 374              * Workaround for broken implementations that use signature
 375              * algorithm OID instead of digest.
 376              */
 377             || EVP_MD_pkey_type(EVP_MD_CTX_md(mtmp)) == nid)
 378             return EVP_MD_CTX_copy_ex(mctx, mtmp);
 379         chain = BIO_next(chain);
 380     }
 381 }
 382
 383 static STACK_OF(CMS_CertificateChoices)
 384 **cms_get0_certificate_choices(CMS_ContentInfo *cms)
 385 {
 386     switch (OBJ_obj2nid(cms->contentType)) {
 387
 388     case NID_pkcs7_signed:
 389         return &cms->d.signedData->certificates;
 390
 391     case NID_pkcs7_enveloped:
 392         return &cms->d.envelopedData->originatorInfo->certificates;
 393
 394     default:
 395         CMSerr(CMS_F_CMS_GET0_CERTIFICATE_CHOICES,
 396                CMS_R_UNSUPPORTED_CONTENT_TYPE);
 397         return NULL;
 398
 399     }
 400 }
 401
 402 CMS_CertificateChoices *CMS_add0_CertificateChoices(CMS_ContentInfo *cms)
 403 {
 404     STACK_OF(CMS_CertificateChoices) **pcerts;
 405     CMS_CertificateChoices *cch;
 406     pcerts = cms_get0_certificate_choices(cms);
 407     if (!pcerts)
 408         return NULL;
 409     if (!*pcerts)
 410         *pcerts = sk_CMS_CertificateChoices_new_null();
 411     if (!*pcerts)
 412         return NULL;
 413     cch = M_ASN1_new_of(CMS_CertificateChoices);
 414     if (!cch)
 415         return NULL;
 416     if (!sk_CMS_CertificateChoices_push(*pcerts, cch)) {
 417         M_ASN1_free_of(cch, CMS_CertificateChoices);
 418         return NULL;
 419     }
 420     return cch;
 421 }
 422
 423 int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert)
 424 {
 425     CMS_CertificateChoices *cch;
 426     STACK_OF(CMS_CertificateChoices) **pcerts;
 427     int i;
 428     pcerts = cms_get0_certificate_choices(cms);
 429     if (!pcerts)
 430         return 0;
 431     for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) {
 432         cch = sk_CMS_CertificateChoices_value(*pcerts, i);
 433         if (cch->type == CMS_CERTCHOICE_CERT) {
 434             if (!X509_cmp(cch->d.certificate, cert)) {
 435                 CMSerr(CMS_F_CMS_ADD0_CERT,
 436                        CMS_R_CERTIFICATE_ALREADY_PRESENT);
 437                 return 0;
 438             }
 439         }
 440     }
 441     cch = CMS_add0_CertificateChoices(cms);
 442     if (!cch)
 443         return 0;
 444     cch->type = CMS_CERTCHOICE_CERT;
 445     cch->d.certificate = cert;
 446     return 1;
 447 }
 448
 449 int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert)
 450 {
 451     int r;
 452     r = CMS_add0_cert(cms, cert);
 453     if (r > 0)
 454         X509_up_ref(cert);
 455     return r;
 456 }
 457
 458 static STACK_OF(CMS_RevocationInfoChoice)
 459 **cms_get0_revocation_choices(CMS_ContentInfo *cms)
 460 {
 461     switch (OBJ_obj2nid(cms->contentType)) {
 462
 463     case NID_pkcs7_signed:
 464         return &cms->d.signedData->crls;
 465
 466     case NID_pkcs7_enveloped:
 467         return &cms->d.envelopedData->originatorInfo->crls;
 468
 469     default:
 470         CMSerr(CMS_F_CMS_GET0_REVOCATION_CHOICES,
 471                CMS_R_UNSUPPORTED_CONTENT_TYPE);
 472         return NULL;
 473
 474     }
 475 }
 476
 477 CMS_RevocationInfoChoice *CMS_add0_RevocationInfoChoice(CMS_ContentInfo *cms)
 478 {
 479     STACK_OF(CMS_RevocationInfoChoice) **pcrls;
 480     CMS_RevocationInfoChoice *rch;
 481     pcrls = cms_get0_revocation_choices(cms);
 482     if (!pcrls)
 483         return NULL;
 484     if (!*pcrls)
 485         *pcrls = sk_CMS_RevocationInfoChoice_new_null();
 486     if (!*pcrls)
 487         return NULL;
 488     rch = M_ASN1_new_of(CMS_RevocationInfoChoice);
 489     if (!rch)
 490         return NULL;
 491     if (!sk_CMS_RevocationInfoChoice_push(*pcrls, rch)) {
 492         M_ASN1_free_of(rch, CMS_RevocationInfoChoice);
 493         return NULL;
 494     }
 495     return rch;
 496 }
 497
 498 int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl)
 499 {
 500     CMS_RevocationInfoChoice *rch;
 501     rch = CMS_add0_RevocationInfoChoice(cms);
 502     if (!rch)
 503         return 0;
 504     rch->type = CMS_REVCHOICE_CRL;
 505     rch->d.crl = crl;
 506     return 1;
 507 }
 508
 509 int CMS_add1_crl(CMS_ContentInfo *cms, X509_CRL *crl)
 510 {
 511     int r;
 512     r = CMS_add0_crl(cms, crl);
 513     if (r > 0)
 514         X509_CRL_up_ref(crl);
 515     return r;
 516 }
 517
 518 STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms)
 519 {
 520     STACK_OF(X509) *certs = NULL;
 521     CMS_CertificateChoices *cch;
 522     STACK_OF(CMS_CertificateChoices) **pcerts;
 523     int i;
 524     pcerts = cms_get0_certificate_choices(cms);
 525     if (!pcerts)
 526         return NULL;
 527     for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++) {
 528         cch = sk_CMS_CertificateChoices_value(*pcerts, i);
 529         if (cch->type == 0) {
 530             if (!certs) {
 531                 certs = sk_X509_new_null();
 532                 if (!certs)
 533                     return NULL;
 534             }
 535             if (!sk_X509_push(certs, cch->d.certificate)) {
 536                 sk_X509_pop_free(certs, X509_free);
 537                 return NULL;
 538             }
 539             X509_up_ref(cch->d.certificate);
 540         }
 541     }
 542     return certs;
 543
 544 }
 545
 546 STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms)
 547 {
 548     STACK_OF(X509_CRL) *crls = NULL;
 549     STACK_OF(CMS_RevocationInfoChoice) **pcrls;
 550     CMS_RevocationInfoChoice *rch;
 551     int i;
 552     pcrls = cms_get0_revocation_choices(cms);
 553     if (!pcrls)
 554         return NULL;
 555     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(*pcrls); i++) {
 556         rch = sk_CMS_RevocationInfoChoice_value(*pcrls, i);
 557         if (rch->type == 0) {
 558             if (!crls) {
 559                 crls = sk_X509_CRL_new_null();
 560                 if (!crls)
 561                     return NULL;
 562             }
 563             if (!sk_X509_CRL_push(crls, rch->d.crl)) {
 564                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 565                 return NULL;
 566             }
 567             X509_CRL_up_ref(rch->d.crl);
 568         }
 569     }
 570     return crls;
 571 }
 572
 573 int cms_ias_cert_cmp(CMS_IssuerAndSerialNumber *ias, X509 *cert)
 574 {
 575     int ret;
 576     ret = X509_NAME_cmp(ias->issuer, X509_get_issuer_name(cert));
 577     if (ret)
 578         return ret;
 579     return ASN1_INTEGER_cmp(ias->serialNumber, X509_get_serialNumber(cert));
 580 }
 581
 582 int cms_keyid_cert_cmp(ASN1_OCTET_STRING *keyid, X509 *cert)
 583 {
 584     const ASN1_OCTET_STRING *cert_keyid = X509_get0_subject_key_id(cert);
 585
 586     if (cert_keyid == NULL)
 587         return -1;
 588     return ASN1_OCTET_STRING_cmp(keyid, cert_keyid);
 589 }
 590
 591 int cms_set1_ias(CMS_IssuerAndSerialNumber **pias, X509 *cert)
 592 {
 593     CMS_IssuerAndSerialNumber *ias;
 594     ias = M_ASN1_new_of(CMS_IssuerAndSerialNumber);
 595     if (!ias)
 596         goto err;
 597     if (!X509_NAME_set(&ias->issuer, X509_get_issuer_name(cert)))
 598         goto err;
 599     if (!ASN1_STRING_copy(ias->serialNumber, X509_get_serialNumber(cert)))
 600         goto err;
 601     M_ASN1_free_of(*pias, CMS_IssuerAndSerialNumber);
 602     *pias = ias;
 603     return 1;
 604  err:
 605     M_ASN1_free_of(ias, CMS_IssuerAndSerialNumber);
 606     CMSerr(CMS_F_CMS_SET1_IAS, ERR_R_MALLOC_FAILURE);
 607     return 0;
 608 }
 609
 610 int cms_set1_keyid(ASN1_OCTET_STRING **pkeyid, X509 *cert)
 611 {
 612     ASN1_OCTET_STRING *keyid = NULL;
 613     const ASN1_OCTET_STRING *cert_keyid;
 614     cert_keyid = X509_get0_subject_key_id(cert);
 615     if (cert_keyid == NULL) {
 616         CMSerr(CMS_F_CMS_SET1_KEYID, CMS_R_CERTIFICATE_HAS_NO_KEYID);
 617         return 0;
 618     }
 619     keyid = ASN1_STRING_dup(cert_keyid);
 620     if (!keyid) {
 621         CMSerr(CMS_F_CMS_SET1_KEYID, ERR_R_MALLOC_FAILURE);
 622         return 0;
 623     }
 624     ASN1_OCTET_STRING_free(*pkeyid);
 625     *pkeyid = keyid;
 626     return 1;
 627 }