net/cert/x509_util_nss.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/cert/x509_util.h"
   6 #include "net/cert/x509_util_nss.h"
   7
   8 #include <cert.h>  // Must be included before certdb.h
   9 #include <certdb.h>
  10 #include <cryptohi.h>
  11 #include <nss.h>
  12 #include <pk11pub.h>
  13 #include <prerror.h>
  14 #include <secder.h>
  15 #include <secmod.h>
  16 #include <secport.h>
  17
  18 #include "base/debug/leak_annotations.h"
  19 #include "base/logging.h"
  20 #include "base/memory/scoped_ptr.h"
  21 #include "base/memory/singleton.h"
  22 #include "base/pickle.h"
  23 #include "base/strings/stringprintf.h"
  24 #include "crypto/ec_private_key.h"
  25 #include "crypto/nss_util.h"
  26 #include "crypto/nss_util_internal.h"
  27 #include "crypto/rsa_private_key.h"
  28 #include "crypto/scoped_nss_types.h"
  29 #include "crypto/third_party/nss/chromium-nss.h"
  30 #include "net/cert/x509_certificate.h"
  31
  32 namespace net {
  33
  34 namespace {
  35
  36 class ChannelIDOIDWrapper {
  37  public:
  38   static ChannelIDOIDWrapper* GetInstance() {
  39     // Instantiated as a leaky singleton to allow the singleton to be
  40     // constructed on a worker thead that is not joined when a process
  41     // shuts down.
  42     return Singleton<ChannelIDOIDWrapper,
  43                      LeakySingletonTraits<ChannelIDOIDWrapper> >::get();
  44   }
  45
  46   SECOidTag domain_bound_cert_oid_tag() const {
  47     return domain_bound_cert_oid_tag_;
  48   }
  49
  50  private:
  51   friend struct DefaultSingletonTraits<ChannelIDOIDWrapper>;
  52
  53   ChannelIDOIDWrapper();
  54
  55   SECOidTag domain_bound_cert_oid_tag_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(ChannelIDOIDWrapper);
  58 };
  59
  60 ChannelIDOIDWrapper::ChannelIDOIDWrapper()
  61     : domain_bound_cert_oid_tag_(SEC_OID_UNKNOWN) {
  62   // 1.3.6.1.4.1.11129.2.1.6
  63   // (iso.org.dod.internet.private.enterprises.google.googleSecurity.
  64   //  certificateExtensions.originBoundCertificate)
  65   static const uint8 kObCertOID[] = {
  66     0x2b, 0x06, 0x01, 0x04, 0x01, 0xd6, 0x79, 0x02, 0x01, 0x06
  67   };
  68   SECOidData oid_data;
  69   memset(&oid_data, 0, sizeof(oid_data));
  70   oid_data.oid.data = const_cast<uint8*>(kObCertOID);
  71   oid_data.oid.len = sizeof(kObCertOID);
  72   oid_data.offset = SEC_OID_UNKNOWN;
  73   oid_data.desc = "Origin Bound Certificate";
  74   oid_data.mechanism = CKM_INVALID_MECHANISM;
  75   oid_data.supportedExtension = SUPPORTED_CERT_EXTENSION;
  76   domain_bound_cert_oid_tag_ = SECOID_AddEntry(&oid_data);
  77   if (domain_bound_cert_oid_tag_ == SEC_OID_UNKNOWN)
  78     LOG(ERROR) << "OB_CERT OID tag creation failed";
  79 }
  80
  81 // Creates a Certificate object that may be passed to the SignCertificate
  82 // method to generate an X509 certificate.
  83 // Returns NULL if an error is encountered in the certificate creation
  84 // process.
  85 // Caller responsible for freeing returned certificate object.
  86 CERTCertificate* CreateCertificate(
  87     SECKEYPublicKey* public_key,
  88     const std::string& subject,
  89     uint32 serial_number,
  90     base::Time not_valid_before,
  91     base::Time not_valid_after) {
  92   // Create info about public key.
  93   CERTSubjectPublicKeyInfo* spki =
  94       SECKEY_CreateSubjectPublicKeyInfo(public_key);
  95   if (!spki)
  96     return NULL;
  97
  98   // Create the certificate request.
  99   CERTName* subject_name =
 100       CERT_AsciiToName(const_cast<char*>(subject.c_str()));
 101   CERTCertificateRequest* cert_request =
 102       CERT_CreateCertificateRequest(subject_name, spki, NULL);
 103   SECKEY_DestroySubjectPublicKeyInfo(spki);
 104
 105   if (!cert_request) {
 106     PRErrorCode prerr = PR_GetError();
 107     LOG(ERROR) << "Failed to create certificate request: " << prerr;
 108     CERT_DestroyName(subject_name);
 109     return NULL;
 110   }
 111
 112   CERTValidity* validity = CERT_CreateValidity(
 113       crypto::BaseTimeToPRTime(not_valid_before),
 114       crypto::BaseTimeToPRTime(not_valid_after));
 115   if (!validity) {
 116     PRErrorCode prerr = PR_GetError();
 117     LOG(ERROR) << "Failed to create certificate validity object: " << prerr;
 118     CERT_DestroyName(subject_name);
 119     CERT_DestroyCertificateRequest(cert_request);
 120     return NULL;
 121   }
 122   CERTCertificate* cert = CERT_CreateCertificate(serial_number, subject_name,
 123                                                  validity, cert_request);
 124   if (!cert) {
 125     PRErrorCode prerr = PR_GetError();
 126     LOG(ERROR) << "Failed to create certificate: " << prerr;
 127   }
 128
 129   // Cleanup for resources used to generate the cert.
 130   CERT_DestroyName(subject_name);
 131   CERT_DestroyValidity(validity);
 132   CERT_DestroyCertificateRequest(cert_request);
 133
 134   return cert;
 135 }
 136
 137 SECOidTag ToSECOid(x509_util::DigestAlgorithm alg) {
 138   switch (alg) {
 139     case x509_util::DIGEST_SHA1:
 140       return SEC_OID_SHA1;
 141     case x509_util::DIGEST_SHA256:
 142       return SEC_OID_SHA256;
 143   }
 144   return SEC_OID_UNKNOWN;
 145 }
 146
 147 // Signs a certificate object, with |key| generating a new X509Certificate
 148 // and destroying the passed certificate object (even when NULL is returned).
 149 // The logic of this method references SignCert() in NSS utility certutil:
 150 // http://mxr.mozilla.org/security/ident?i=SignCert.
 151 // Returns true on success or false if an error is encountered in the
 152 // certificate signing process.
 153 bool SignCertificate(
 154     CERTCertificate* cert,
 155     SECKEYPrivateKey* key,
 156     SECOidTag hash_algorithm) {
 157   // |arena| is used to encode the cert.
 158   PLArenaPool* arena = cert->arena;
 159   SECOidTag algo_id = SEC_GetSignatureAlgorithmOidTag(key->keyType,
 160                                                       hash_algorithm);
 161   if (algo_id == SEC_OID_UNKNOWN)
 162     return false;
 163
 164   SECStatus rv = SECOID_SetAlgorithmID(arena, &cert->signature, algo_id, 0);
 165   if (rv != SECSuccess)
 166     return false;
 167
 168   // Generate a cert of version 3.
 169   *(cert->version.data) = 2;
 170   cert->version.len = 1;
 171
 172   SECItem der = { siBuffer, NULL, 0 };
 173
 174   // Use ASN1 DER to encode the cert.
 175   void* encode_result = SEC_ASN1EncodeItem(
 176       NULL, &der, cert, SEC_ASN1_GET(CERT_CertificateTemplate));
 177   if (!encode_result)
 178     return false;
 179
 180   // Allocate space to contain the signed cert.
 181   SECItem result = { siBuffer, NULL, 0 };
 182
 183   // Sign the ASN1 encoded cert and save it to |result|.
 184   rv = DerSignData(arena, &result, &der, key, algo_id);
 185   PORT_Free(der.data);
 186   if (rv != SECSuccess) {
 187     DLOG(ERROR) << "DerSignData: " << PORT_GetError();
 188     return false;
 189   }
 190
 191   // Save the signed result to the cert.
 192   cert->derCert = result;
 193
 194   return true;
 195 }
 196
 197 #if defined(USE_NSS) || defined(OS_IOS)
 198 // Callback for CERT_DecodeCertPackage(), used in
 199 // CreateOSCertHandlesFromBytes().
 200 SECStatus PR_CALLBACK CollectCertsCallback(void* arg,
 201                                            SECItem** certs,
 202                                            int num_certs) {
 203   X509Certificate::OSCertHandles* results =
 204       reinterpret_cast<X509Certificate::OSCertHandles*>(arg);
 205
 206   for (int i = 0; i < num_certs; ++i) {
 207     X509Certificate::OSCertHandle handle =
 208         X509Certificate::CreateOSCertHandleFromBytes(
 209             reinterpret_cast<char*>(certs[i]->data), certs[i]->len);
 210     if (handle)
 211       results->push_back(handle);
 212   }
 213
 214   return SECSuccess;
 215 }
 216
 217 typedef scoped_ptr<
 218     CERTName,
 219     crypto::NSSDestroyer<CERTName, CERT_DestroyName> > ScopedCERTName;
 220
 221 // Create a new CERTName object from its encoded representation.
 222 // |arena| is the allocation pool to use.
 223 // |data| points to a DER-encoded X.509 DistinguishedName.
 224 // Return a new CERTName pointer on success, or NULL.
 225 CERTName* CreateCertNameFromEncoded(PLArenaPool* arena,
 226                                     const base::StringPiece& data) {
 227   if (!arena)
 228     return NULL;
 229
 230   ScopedCERTName name(PORT_ArenaZNew(arena, CERTName));
 231   if (!name.get())
 232     return NULL;
 233
 234   SECItem item;
 235   item.len = static_cast<unsigned int>(data.length());
 236   item.data = reinterpret_cast<unsigned char*>(
 237       const_cast<char*>(data.data()));
 238
 239   SECStatus rv = SEC_ASN1DecodeItem(
 240       arena, name.get(), SEC_ASN1_GET(CERT_NameTemplate), &item);
 241   if (rv != SECSuccess)
 242     return NULL;
 243
 244   return name.release();
 245 }
 246
 247 #endif  // defined(USE_NSS) || defined(OS_IOS)
 248
 249 }  // namespace
 250
 251 namespace x509_util {
 252
 253 bool CreateSelfSignedCert(crypto::RSAPrivateKey* key,
 254                           DigestAlgorithm alg,
 255                           const std::string& subject,
 256                           uint32 serial_number,
 257                           base::Time not_valid_before,
 258                           base::Time not_valid_after,
 259                           std::string* der_cert) {
 260   DCHECK(key);
 261   DCHECK(!strncmp(subject.c_str(), "CN=", 3U));
 262   CERTCertificate* cert = CreateCertificate(key->public_key(),
 263                                             subject,
 264                                             serial_number,
 265                                             not_valid_before,
 266                                             not_valid_after);
 267   if (!cert)
 268     return false;
 269
 270   if (!SignCertificate(cert, key->key(), ToSECOid(alg))) {
 271     CERT_DestroyCertificate(cert);
 272     return false;
 273   }
 274
 275   der_cert->assign(reinterpret_cast<char*>(cert->derCert.data),
 276                    cert->derCert.len);
 277   CERT_DestroyCertificate(cert);
 278   return true;
 279 }
 280
 281 bool IsSupportedValidityRange(base::Time not_valid_before,
 282                               base::Time not_valid_after) {
 283   CERTValidity* validity = CERT_CreateValidity(
 284       crypto::BaseTimeToPRTime(not_valid_before),
 285       crypto::BaseTimeToPRTime(not_valid_after));
 286
 287   if (!validity)
 288     return false;
 289
 290   CERT_DestroyValidity(validity);
 291   return true;
 292 }
 293
 294 bool CreateChannelIDEC(crypto::ECPrivateKey* key,
 295                        DigestAlgorithm alg,
 296                        const std::string& domain,
 297                        uint32 serial_number,
 298                        base::Time not_valid_before,
 299                        base::Time not_valid_after,
 300                        std::string* der_cert) {
 301   DCHECK(key);
 302
 303   CERTCertificate* cert = CreateCertificate(key->public_key(),
 304                                             "CN=anonymous.invalid",
 305                                             serial_number,
 306                                             not_valid_before,
 307                                             not_valid_after);
 308
 309   if (!cert)
 310     return false;
 311
 312   // Create opaque handle used to add extensions later.
 313   void* cert_handle;
 314   if ((cert_handle = CERT_StartCertExtensions(cert)) == NULL) {
 315     LOG(ERROR) << "Unable to get opaque handle for adding extensions";
 316     CERT_DestroyCertificate(cert);
 317     return false;
 318   }
 319
 320   // Create SECItem for IA5String encoding.
 321   SECItem domain_string_item = {
 322     siAsciiString,
 323     (unsigned char*)domain.data(),
 324     static_cast<unsigned>(domain.size())
 325   };
 326
 327   // IA5Encode and arena allocate SECItem
 328   SECItem* asn1_domain_string = SEC_ASN1EncodeItem(
 329       cert->arena, NULL, &domain_string_item,
 330       SEC_ASN1_GET(SEC_IA5StringTemplate));
 331   if (asn1_domain_string == NULL) {
 332     LOG(ERROR) << "Unable to get ASN1 encoding for domain in domain_bound_cert"
 333                   " extension";
 334     CERT_DestroyCertificate(cert);
 335     return false;
 336   }
 337
 338   // Add the extension to the opaque handle
 339   if (CERT_AddExtension(
 340       cert_handle,
 341       ChannelIDOIDWrapper::GetInstance()->domain_bound_cert_oid_tag(),
 342       asn1_domain_string,
 343       PR_TRUE,
 344       PR_TRUE) != SECSuccess){
 345     LOG(ERROR) << "Unable to add domain bound cert extension to opaque handle";
 346     CERT_DestroyCertificate(cert);
 347     return false;
 348   }
 349
 350   // Copy extension into x509 cert
 351   if (CERT_FinishExtensions(cert_handle) != SECSuccess){
 352     LOG(ERROR) << "Unable to copy extension to X509 cert";
 353     CERT_DestroyCertificate(cert);
 354     return false;
 355   }
 356
 357   if (!SignCertificate(cert, key->key(), ToSECOid(alg))) {
 358     CERT_DestroyCertificate(cert);
 359     return false;
 360   }
 361
 362   DCHECK(cert->derCert.len);
 363   // XXX copied from X509Certificate::GetDEREncoded
 364   der_cert->clear();
 365   der_cert->append(reinterpret_cast<char*>(cert->derCert.data),
 366                    cert->derCert.len);
 367   CERT_DestroyCertificate(cert);
 368   return true;
 369 }
 370
 371 #if defined(USE_NSS) || defined(OS_IOS)
 372 void ParsePrincipal(CERTName* name, CertPrincipal* principal) {
 373 // Starting in NSS 3.15, CERTGetNameFunc takes a const CERTName* argument.
 374 #if NSS_VMINOR >= 15
 375   typedef char* (*CERTGetNameFunc)(const CERTName* name);
 376 #else
 377   typedef char* (*CERTGetNameFunc)(CERTName* name);
 378 #endif
 379
 380   // TODO(jcampan): add business_category and serial_number.
 381   // TODO(wtc): NSS has the CERT_GetOrgName, CERT_GetOrgUnitName, and
 382   // CERT_GetDomainComponentName functions, but they return only the most
 383   // general (the first) RDN.  NSS doesn't have a function for the street
 384   // address.
 385   static const SECOidTag kOIDs[] = {
 386     SEC_OID_AVA_STREET_ADDRESS,
 387     SEC_OID_AVA_ORGANIZATION_NAME,
 388     SEC_OID_AVA_ORGANIZATIONAL_UNIT_NAME,
 389     SEC_OID_AVA_DC };
 390
 391   std::vector<std::string>* values[] = {
 392     &principal->street_addresses,
 393     &principal->organization_names,
 394     &principal->organization_unit_names,
 395     &principal->domain_components };
 396   DCHECK_EQ(arraysize(kOIDs), arraysize(values));
 397
 398   CERTRDN** rdns = name->rdns;
 399   for (size_t rdn = 0; rdns[rdn]; ++rdn) {
 400     CERTAVA** avas = rdns[rdn]->avas;
 401     for (size_t pair = 0; avas[pair] != 0; ++pair) {
 402       SECOidTag tag = CERT_GetAVATag(avas[pair]);
 403       for (size_t oid = 0; oid < arraysize(kOIDs); ++oid) {
 404         if (kOIDs[oid] == tag) {
 405           SECItem* decode_item = CERT_DecodeAVAValue(&avas[pair]->value);
 406           if (!decode_item)
 407             break;
 408           // TODO(wtc): Pass decode_item to CERT_RFC1485_EscapeAndQuote.
 409           std::string value(reinterpret_cast<char*>(decode_item->data),
 410                             decode_item->len);
 411           values[oid]->push_back(value);
 412           SECITEM_FreeItem(decode_item, PR_TRUE);
 413           break;
 414         }
 415       }
 416     }
 417   }
 418
 419   // Get CN, L, S, and C.
 420   CERTGetNameFunc get_name_funcs[4] = {
 421     CERT_GetCommonName, CERT_GetLocalityName,
 422     CERT_GetStateName, CERT_GetCountryName };
 423   std::string* single_values[4] = {
 424     &principal->common_name, &principal->locality_name,
 425     &principal->state_or_province_name, &principal->country_name };
 426   for (size_t i = 0; i < arraysize(get_name_funcs); ++i) {
 427     char* value = get_name_funcs[i](name);
 428     if (value) {
 429       single_values[i]->assign(value);
 430       PORT_Free(value);
 431     }
 432   }
 433 }
 434
 435 void ParseDate(const SECItem* der_date, base::Time* result) {
 436   PRTime prtime;
 437   SECStatus rv = DER_DecodeTimeChoice(&prtime, der_date);
 438   DCHECK_EQ(SECSuccess, rv);
 439   *result = crypto::PRTimeToBaseTime(prtime);
 440 }
 441
 442 std::string ParseSerialNumber(const CERTCertificate* certificate) {
 443   return std::string(reinterpret_cast<char*>(certificate->serialNumber.data),
 444                      certificate->serialNumber.len);
 445 }
 446
 447 void GetSubjectAltName(CERTCertificate* cert_handle,
 448                        std::vector<std::string>* dns_names,
 449                        std::vector<std::string>* ip_addrs) {
 450   if (dns_names)
 451     dns_names->clear();
 452   if (ip_addrs)
 453     ip_addrs->clear();
 454
 455   SECItem alt_name;
 456   SECStatus rv = CERT_FindCertExtension(cert_handle,
 457                                         SEC_OID_X509_SUBJECT_ALT_NAME,
 458                                         &alt_name);
 459   if (rv != SECSuccess)
 460     return;
 461
 462   PLArenaPool* arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
 463   DCHECK(arena != NULL);
 464
 465   CERTGeneralName* alt_name_list;
 466   alt_name_list = CERT_DecodeAltNameExtension(arena, &alt_name);
 467   SECITEM_FreeItem(&alt_name, PR_FALSE);
 468
 469   CERTGeneralName* name = alt_name_list;
 470   while (name) {
 471     // DNSName and IPAddress are encoded as IA5String and OCTET STRINGs
 472     // respectively, both of which can be byte copied from
 473     // SECItemType::data into the appropriate output vector.
 474     if (dns_names && name->type == certDNSName) {
 475       dns_names->push_back(std::string(
 476           reinterpret_cast<char*>(name->name.other.data),
 477           name->name.other.len));
 478     } else if (ip_addrs && name->type == certIPAddress) {
 479       ip_addrs->push_back(std::string(
 480           reinterpret_cast<char*>(name->name.other.data),
 481           name->name.other.len));
 482     }
 483     name = CERT_GetNextGeneralName(name);
 484     if (name == alt_name_list)
 485       break;
 486   }
 487   PORT_FreeArena(arena, PR_FALSE);
 488 }
 489
 490 X509Certificate::OSCertHandles CreateOSCertHandlesFromBytes(
 491     const char* data,
 492     int length,
 493     X509Certificate::Format format) {
 494   X509Certificate::OSCertHandles results;
 495   if (length < 0)
 496     return results;
 497
 498   crypto::EnsureNSSInit();
 499
 500   if (!NSS_IsInitialized())
 501     return results;
 502
 503   switch (format) {
 504     case X509Certificate::FORMAT_SINGLE_CERTIFICATE: {
 505       X509Certificate::OSCertHandle handle =
 506           X509Certificate::CreateOSCertHandleFromBytes(data, length);
 507       if (handle)
 508         results.push_back(handle);
 509       break;
 510     }
 511     case X509Certificate::FORMAT_PKCS7: {
 512       // Make a copy since CERT_DecodeCertPackage may modify it
 513       std::vector<char> data_copy(data, data + length);
 514
 515       SECStatus result = CERT_DecodeCertPackage(&data_copy[0],
 516           length, CollectCertsCallback, &results);
 517       if (result != SECSuccess)
 518         results.clear();
 519       break;
 520     }
 521     default:
 522       NOTREACHED() << "Certificate format " << format << " unimplemented";
 523       break;
 524   }
 525
 526   return results;
 527 }
 528
 529 X509Certificate::OSCertHandle ReadOSCertHandleFromPickle(
 530     PickleIterator* pickle_iter) {
 531   const char* data;
 532   int length;
 533   if (!pickle_iter->ReadData(&data, &length))
 534     return NULL;
 535
 536   return X509Certificate::CreateOSCertHandleFromBytes(data, length);
 537 }
 538
 539 void GetPublicKeyInfo(CERTCertificate* handle,
 540                       size_t* size_bits,
 541                       X509Certificate::PublicKeyType* type) {
 542   // Since we might fail, set the output parameters to default values first.
 543   *type = X509Certificate::kPublicKeyTypeUnknown;
 544   *size_bits = 0;
 545
 546   crypto::ScopedSECKEYPublicKey key(CERT_ExtractPublicKey(handle));
 547   if (!key.get())
 548     return;
 549
 550   *size_bits = SECKEY_PublicKeyStrengthInBits(key.get());
 551
 552   switch (key->keyType) {
 553     case rsaKey:
 554       *type = X509Certificate::kPublicKeyTypeRSA;
 555       break;
 556     case dsaKey:
 557       *type = X509Certificate::kPublicKeyTypeDSA;
 558       break;
 559     case dhKey:
 560       *type = X509Certificate::kPublicKeyTypeDH;
 561       break;
 562     case ecKey:
 563       *type = X509Certificate::kPublicKeyTypeECDSA;
 564       break;
 565     default:
 566       *type = X509Certificate::kPublicKeyTypeUnknown;
 567       *size_bits = 0;
 568       break;
 569   }
 570 }
 571
 572 bool GetIssuersFromEncodedList(
 573     const std::vector<std::string>& encoded_issuers,
 574     PLArenaPool* arena,
 575     std::vector<CERTName*>* out) {
 576   std::vector<CERTName*> result;
 577   for (size_t n = 0; n < encoded_issuers.size(); ++n) {
 578     CERTName* name = CreateCertNameFromEncoded(arena, encoded_issuers[n]);
 579     if (name != NULL)
 580       result.push_back(name);
 581   }
 582
 583   if (result.size() == encoded_issuers.size()) {
 584     out->swap(result);
 585     return true;
 586   }
 587
 588   for (size_t n = 0; n < result.size(); ++n)
 589     CERT_DestroyName(result[n]);
 590   return false;
 591 }
 592
 593
 594 bool IsCertificateIssuedBy(const std::vector<CERTCertificate*>& cert_chain,
 595                            const std::vector<CERTName*>& valid_issuers) {
 596   for (size_t n = 0; n < cert_chain.size(); ++n) {
 597     CERTName* cert_issuer = &cert_chain[n]->issuer;
 598     for (size_t i = 0; i < valid_issuers.size(); ++i) {
 599       if (CERT_CompareName(valid_issuers[i], cert_issuer) == SECEqual)
 600         return true;
 601     }
 602   }
 603   return false;
 604 }
 605
 606 std::string GetUniqueNicknameForSlot(const std::string& nickname,
 607                                      const SECItem* subject,
 608                                      PK11SlotInfo* slot) {
 609   int index = 2;
 610   std::string new_name = nickname;
 611   std::string temp_nickname = new_name;
 612   std::string token_name;
 613
 614   if (!slot)
 615     return new_name;
 616
 617   if (!PK11_IsInternalKeySlot(slot)) {
 618     token_name.assign(PK11_GetTokenName(slot));
 619     token_name.append(":");
 620
 621     temp_nickname = token_name + new_name;
 622   }
 623
 624   while (SEC_CertNicknameConflict(temp_nickname.c_str(),
 625                                   const_cast<SECItem*>(subject),
 626                                   CERT_GetDefaultCertDB())) {
 627     base::SStringPrintf(&new_name, "%s #%d", nickname.c_str(), index++);
 628     temp_nickname = token_name + new_name;
 629   }
 630
 631   return new_name;
 632 }
 633
 634 #endif  // defined(USE_NSS) || defined(OS_IOS)
 635
 636 } // namespace x509_util
 637
 638 } // namespace net