libsecurity_smime/lib/cmsrecinfo.c

   1 /*
   2  * The contents of this file are subject to the Mozilla Public
   3  * License Version 1.1 (the "License"); you may not use this file
   4  * except in compliance with the License. You may obtain a copy of
   5  * the License at http://www.mozilla.org/MPL/
   6  *
   7  * Software distributed under the License is distributed on an "AS
   8  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
   9  * implied. See the License for the specific language governing
  10  * rights and limitations under the License.
  11  *
  12  * The Original Code is the Netscape security libraries.
  13  *
  14  * The Initial Developer of the Original Code is Netscape
  15  * Communications Corporation.  Portions created by Netscape are
  16  * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
  17  * Rights Reserved.
  18  *
  19  * Contributor(s):
  20  *
  21  * Alternatively, the contents of this file may be used under the
  22  * terms of the GNU General Public License Version 2 or later (the
  23  * "GPL"), in which case the provisions of the GPL are applicable
  24  * instead of those above.  If you wish to allow use of your
  25  * version of this file only under the terms of the GPL and not to
  26  * allow others to use your version of this file under the MPL,
  27  * indicate your decision by deleting the provisions above and
  28  * replace them with the notice and other provisions required by
  29  * the GPL.  If you do not delete the provisions above, a recipient
  30  * may use your version of this file under either the MPL or the
  31  * GPL.
  32  */
  33
  34 /*
  35  * CMS recipientInfo methods.
  36  */
  37
  38 #include "cmslocal.h"
  39
  40 #include "cert.h"
  41 #include "SecAsn1Item.h"
  42 #include "secoid.h"
  43
  44 #include <security_asn1/secasn1.h>
  45 #include <security_asn1/secerr.h>
  46 #include <security_asn1/secport.h>
  47
  48 #include <Security/SecKeyPriv.h>
  49 #include <Security/SecCertificatePriv.h>
  50 #include <Security/SecCertificateInternal.h>
  51
  52 #include <Security/SecCmsRecipientInfo.h>
  53
  54 static Boolean
  55 nss_cmsrecipientinfo_usessubjectkeyid(SecCmsRecipientInfoRef ri)
  56 {
  57     if (ri->recipientInfoType == SecCmsRecipientInfoIDKeyTrans) {
  58         SecCmsRecipientIdentifier *rid;
  59         rid = &ri->ri.keyTransRecipientInfo.recipientIdentifier;
  60         if (rid->identifierType == SecCmsRecipientIDSubjectKeyID) {
  61             return PR_TRUE;
  62         }
  63     }
  64     return PR_FALSE;
  65 }
  66
  67
  68 static SecCmsRecipientInfoRef
  69 nss_cmsrecipientinfo_create(SecCmsEnvelopedDataRef envd, SecCmsRecipientIDSelector type,
  70                             SecCertificateRef cert, SecPublicKeyRef pubKey,
  71                             const SecAsn1Item *subjKeyID)
  72 {
  73     SecCmsRecipientInfoRef ri;
  74     void *mark;
  75     SECOidTag certalgtag;
  76     OSStatus rv = SECSuccess;
  77     SecCmsRecipientEncryptedKey *rek;
  78     SecCmsOriginatorIdentifierOrKey *oiok;
  79     unsigned long version;
  80     SecAsn1Item * dummy;
  81     PLArenaPool *poolp;
  82     const SECAlgorithmID *algid;
  83     SECAlgorithmID freeAlgID;
  84
  85     SecCmsRecipientIdentifier *rid;
  86
  87     poolp = envd->contentInfo.cmsg->poolp;
  88
  89     mark = PORT_ArenaMark(poolp);
  90
  91     ri = (SecCmsRecipientInfoRef)PORT_ArenaZAlloc(poolp, sizeof(SecCmsRecipientInfo));
  92     if (ri == NULL)
  93         goto loser;
  94
  95     ri->envelopedData = envd;
  96
  97 #if USE_CDSA_CRYPTO
  98     if (type == SecCmsRecipientIDIssuerSN)
  99     {
 100         rv = SecCertificateGetAlgorithmID(cert,&algid);
 101     } else {
 102         PORT_Assert(pubKey);
 103         rv = SecKeyGetAlgorithmID(pubKey,&algid);
 104     }
 105 #else
 106     ri->cert = CERT_DupCertificate(cert);
 107     if (ri->cert == NULL)
 108         goto loser;
 109
 110     const SecAsn1AlgId *length_data_swapped = (const SecAsn1AlgId *)SecCertificateGetPublicKeyAlgorithm(cert);
 111     freeAlgID.algorithm.Length = (size_t)length_data_swapped->algorithm.Data;
 112     freeAlgID.algorithm.Data = (uint8_t *)length_data_swapped->algorithm.Length;
 113     freeAlgID.parameters.Length = (size_t)length_data_swapped->parameters.Data;
 114     freeAlgID.parameters.Data = (uint8_t *)length_data_swapped->parameters.Length;
 115     algid = &freeAlgID;
 116 #endif
 117
 118     certalgtag = SECOID_GetAlgorithmTag(algid);
 119
 120     rid = &ri->ri.keyTransRecipientInfo.recipientIdentifier;
 121     switch (certalgtag) {
 122     case SEC_OID_PKCS1_RSA_ENCRYPTION:
 123         ri->recipientInfoType = SecCmsRecipientInfoIDKeyTrans;
 124         rid->identifierType = type;
 125         if (type == SecCmsRecipientIDIssuerSN) {
 126             rid->id.issuerAndSN = CERT_GetCertIssuerAndSN(poolp, cert);
 127             if (rid->id.issuerAndSN == NULL) {
 128               break;
 129             }
 130         } else if (type == SecCmsRecipientIDSubjectKeyID){
 131
 132             rid->id.subjectKeyID = PORT_ArenaNew(poolp, SecAsn1Item);
 133             if (rid->id.subjectKeyID == NULL) {
 134                 rv = SECFailure;
 135                 PORT_SetError(SEC_ERROR_NO_MEMORY);
 136                 break;
 137             }
 138             if (SECITEM_CopyItem(poolp, rid->id.subjectKeyID, subjKeyID)) {
 139                 rv = SECFailure;
 140                 PORT_SetError(SEC_ERROR_UNKNOWN_CERT);
 141                 break;
 142             }
 143             if (rid->id.subjectKeyID->Data == NULL) {
 144                 rv = SECFailure;
 145                 PORT_SetError(SEC_ERROR_NO_MEMORY);
 146                 break;
 147             }
 148         } else {
 149             PORT_SetError(SEC_ERROR_INVALID_ARGS);
 150             rv = SECFailure;
 151         }
 152         break;
 153     case SEC_OID_MISSI_KEA_DSS_OLD:
 154     case SEC_OID_MISSI_KEA_DSS:
 155     case SEC_OID_MISSI_KEA:
 156         PORT_Assert(type != SecCmsRecipientIDSubjectKeyID);
 157         if (type == SecCmsRecipientIDSubjectKeyID) {
 158             rv = SECFailure;
 159             break;
 160         }
 161         /* backward compatibility - this is not really a keytrans operation */
 162         ri->recipientInfoType = SecCmsRecipientInfoIDKeyTrans;
 163         /* hardcoded issuerSN choice for now */
 164         ri->ri.keyTransRecipientInfo.recipientIdentifier.identifierType = SecCmsRecipientIDIssuerSN;
 165         ri->ri.keyTransRecipientInfo.recipientIdentifier.id.issuerAndSN = CERT_GetCertIssuerAndSN(poolp, cert);
 166         if (ri->ri.keyTransRecipientInfo.recipientIdentifier.id.issuerAndSN == NULL) {
 167             rv = SECFailure;
 168             break;
 169         }
 170         break;
 171     case SEC_OID_X942_DIFFIE_HELMAN_KEY: /* dh-public-number */
 172         PORT_Assert(type != SecCmsRecipientIDSubjectKeyID);
 173         if (type == SecCmsRecipientIDSubjectKeyID) {
 174             rv = SECFailure;
 175             break;
 176         }
 177         /* a key agreement op */
 178         ri->recipientInfoType = SecCmsRecipientInfoIDKeyAgree;
 179
 180         if (ri->ri.keyTransRecipientInfo.recipientIdentifier.id.issuerAndSN == NULL) {
 181             rv = SECFailure;
 182             break;
 183         }
 184         /* we do not support the case where multiple recipients
 185          * share the same KeyAgreeRecipientInfo and have multiple RecipientEncryptedKeys
 186          * in this case, we would need to walk all the recipientInfos, take the
 187          * ones that do KeyAgreement algorithms and join them, algorithm by algorithm
 188          * Then, we'd generate ONE ukm and OriginatorIdentifierOrKey */
 189
 190         /* only epheremal-static Diffie-Hellman is supported for now
 191          * this is the only form of key agreement that provides potential anonymity
 192          * of the sender, plus we do not have to include certs in the message */
 193
 194         /* force single recipientEncryptedKey for now */
 195         if ((rek = SecCmsRecipientEncryptedKeyCreate(poolp)) == NULL) {
 196             rv = SECFailure;
 197             break;
 198         }
 199
 200         /* hardcoded IssuerSN choice for now */
 201         rek->recipientIdentifier.identifierType = SecCmsKeyAgreeRecipientIDIssuerSN;
 202         if ((rek->recipientIdentifier.id.issuerAndSN = CERT_GetCertIssuerAndSN(poolp, cert)) == NULL) {
 203             rv = SECFailure;
 204             break;
 205         }
 206
 207         oiok = &(ri->ri.keyAgreeRecipientInfo.originatorIdentifierOrKey);
 208
 209         /* see RFC2630 12.3.1.1 */
 210         oiok->identifierType = SecCmsOriginatorIDOrKeyOriginatorPublicKey;
 211
 212         rv = SecCmsArrayAdd(poolp, (void ***)&ri->ri.keyAgreeRecipientInfo.recipientEncryptedKeys,
 213                                     (void *)rek);
 214
 215         break;
 216     case SEC_OID_EC_PUBLIC_KEY:
 217         /* ephemeral-static ECDH - issuerAndSN, OriginatorPublicKey only */
 218         PORT_Assert(type != SecCmsRecipientIDSubjectKeyID);
 219         if (type == SecCmsRecipientIDSubjectKeyID) {
 220             rv = SECFailure;
 221             break;
 222         }
 223         /* a key agreement op */
 224         ri->recipientInfoType = SecCmsRecipientInfoIDKeyAgree;
 225         ri->ri.keyTransRecipientInfo.recipientIdentifier.id.issuerAndSN = CERT_GetCertIssuerAndSN(poolp, cert);
 226         if (ri->ri.keyTransRecipientInfo.recipientIdentifier.id.issuerAndSN == NULL) {
 227             rv = SECFailure;
 228             break;
 229         }
 230         /* we do not support the case where multiple recipients
 231          * share the same KeyAgreeRecipientInfo and have multiple RecipientEncryptedKeys
 232          * in this case, we would need to walk all the recipientInfos, take the
 233          * ones that do KeyAgreement algorithms and join them, algorithm by algorithm
 234          * Then, we'd generate ONE ukm and OriginatorIdentifierOrKey */
 235
 236         /* force single recipientEncryptedKey for now */
 237         if ((rek = SecCmsRecipientEncryptedKeyCreate(poolp)) == NULL) {
 238             rv = SECFailure;
 239             break;
 240         }
 241
 242         /* hardcoded IssuerSN choice for now */
 243         rek->recipientIdentifier.identifierType = SecCmsKeyAgreeRecipientIDIssuerSN;
 244         if ((rek->recipientIdentifier.id.issuerAndSN = CERT_GetCertIssuerAndSN(poolp, cert)) == NULL) {
 245             rv = SECFailure;
 246             break;
 247         }
 248
 249         oiok = &(ri->ri.keyAgreeRecipientInfo.originatorIdentifierOrKey);
 250
 251         /* see RFC 3278 3.1.1 */
 252         oiok->identifierType = SecCmsOriginatorIDOrKeyOriginatorPublicKey;
 253
 254         rv = SecCmsArrayAdd(poolp, (void ***)&ri->ri.keyAgreeRecipientInfo.recipientEncryptedKeys,
 255                             (void *)rek);
 256
 257         break;
 258     default:
 259         /* other algorithms not supported yet */
 260         /* NOTE that we do not support any KEK algorithm */
 261         PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
 262         rv = SECFailure;
 263         break;
 264     }
 265
 266     if (rv == SECFailure)
 267         goto loser;
 268
 269     /* set version */
 270     switch (ri->recipientInfoType) {
 271     case SecCmsRecipientInfoIDKeyTrans:
 272         if (ri->ri.keyTransRecipientInfo.recipientIdentifier.identifierType == SecCmsRecipientIDIssuerSN)
 273             version = SEC_CMS_KEYTRANS_RECIPIENT_INFO_VERSION_ISSUERSN;
 274         else
 275             version = SEC_CMS_KEYTRANS_RECIPIENT_INFO_VERSION_SUBJKEY;
 276         dummy = SEC_ASN1EncodeInteger(poolp, &(ri->ri.keyTransRecipientInfo.version), version);
 277         if (dummy == NULL)
 278             goto loser;
 279         break;
 280     case SecCmsRecipientInfoIDKeyAgree:
 281         dummy = SEC_ASN1EncodeInteger(poolp, &(ri->ri.keyAgreeRecipientInfo.version),
 282                                                 SEC_CMS_KEYAGREE_RECIPIENT_INFO_VERSION);
 283         if (dummy == NULL)
 284             goto loser;
 285         break;
 286     case SecCmsRecipientInfoIDKEK:
 287         /* NOTE: this cannot happen as long as we do not support any KEK algorithm */
 288         dummy = SEC_ASN1EncodeInteger(poolp, &(ri->ri.kekRecipientInfo.version),
 289                                                 SEC_CMS_KEK_RECIPIENT_INFO_VERSION);
 290         if (dummy == NULL)
 291             goto loser;
 292         break;
 293
 294     }
 295
 296     if (SecCmsEnvelopedDataAddRecipient(envd, ri))
 297         goto loser;
 298
 299     PORT_ArenaUnmark (poolp, mark);
 300 #if 0
 301     if (freeSpki)
 302       SECKEY_DestroySubjectPublicKeyInfo(freeSpki);
 303 #endif
 304     return ri;
 305
 306 loser:
 307 #if 0
 308     if (freeSpki)
 309       SECKEY_DestroySubjectPublicKeyInfo(freeSpki);
 310 #endif
 311     PORT_ArenaRelease (poolp, mark);
 312     return NULL;
 313 }
 314
 315 /*
 316  * SecCmsRecipientInfoCreate - create a recipientinfo
 317  *
 318  * we currently do not create KeyAgreement recipientinfos with multiple
 319  * recipientEncryptedKeys the certificate is supposed to have been
 320  * verified by the caller
 321  */
 322 SecCmsRecipientInfoRef
 323 SecCmsRecipientInfoCreate(SecCmsEnvelopedDataRef envd, SecCertificateRef cert)
 324 {
 325     /* TODO: We might want to prefer subjkeyid */
 326 #if 0
 327     SecCmsRecipientInfoRef info = SecCmsRecipientInfoCreateWithSubjKeyIDFromCert(envd, cert);
 328
 329     if (info)
 330         return info;
 331     else
 332 #endif
 333         return nss_cmsrecipientinfo_create(envd, SecCmsRecipientIDIssuerSN, cert,
 334                                        NULL, NULL);
 335 }
 336
 337 SecCmsRecipientInfoRef
 338 SecCmsRecipientInfoCreateWithSubjKeyID(SecCmsEnvelopedDataRef envd,
 339                                      const SecAsn1Item * subjKeyID,
 340                                      SecPublicKeyRef pubKey)
 341 {
 342     return nss_cmsrecipientinfo_create(envd, SecCmsRecipientIDSubjectKeyID,
 343                                        NULL, pubKey, subjKeyID);
 344 }
 345
 346 SecCmsRecipientInfoRef
 347 SecCmsRecipientInfoCreateWithSubjKeyIDFromCert(SecCmsEnvelopedDataRef envd,
 348                                                SecCertificateRef cert)
 349 {
 350     SecPublicKeyRef pubKey = NULL;
 351     SecAsn1Item subjKeyID = {0, NULL};
 352     SecCmsRecipientInfoRef retVal = NULL;
 353     CFDataRef subjectKeyIDData = NULL;
 354
 355     if (!envd || !cert) {
 356         return NULL;
 357     }
 358     subjectKeyIDData = SecCertificateGetSubjectKeyID(cert);
 359     if (!subjectKeyIDData)
 360         goto done;
 361     subjKeyID.Length =
 362     CFDataGetLength(subjectKeyIDData);
 363     subjKeyID.Data = (uint8_t *)CFDataGetBytePtr(subjectKeyIDData);
 364     retVal = nss_cmsrecipientinfo_create(envd, SecCmsRecipientIDSubjectKeyID,
 365                                          cert, pubKey, &subjKeyID);
 366
 367 done:
 368
 369     return retVal;
 370 }
 371
 372 void
 373 SecCmsRecipientInfoDestroy(SecCmsRecipientInfoRef ri)
 374 {
 375     /* version was allocated on the pool, so no need to destroy it */
 376     /* issuerAndSN was allocated on the pool, so no need to destroy it */
 377     if (ri->cert != NULL)
 378         CERT_DestroyCertificate(ri->cert);
 379
 380     if (nss_cmsrecipientinfo_usessubjectkeyid(ri)) {
 381         SecCmsKeyTransRecipientInfoEx *extra;
 382         extra = &ri->ri.keyTransRecipientInfoEx;
 383         if (extra->pubKey)
 384             SECKEY_DestroyPublicKey(extra->pubKey);
 385     }
 386
 387     /* recipientInfo structure itself was allocated on the pool, so no need to destroy it */
 388     /* we're done. */
 389 }
 390
 391 int
 392 SecCmsRecipientInfoGetVersion(SecCmsRecipientInfoRef ri)
 393 {
 394     unsigned long version;
 395     SecAsn1Item * versionitem = NULL;
 396
 397     switch (ri->recipientInfoType) {
 398     case SecCmsRecipientInfoIDKeyTrans:
 399         /* ignore subIndex */
 400         versionitem = &(ri->ri.keyTransRecipientInfo.version);
 401         break;
 402     case SecCmsRecipientInfoIDKEK:
 403         /* ignore subIndex */
 404         versionitem = &(ri->ri.kekRecipientInfo.version);
 405         break;
 406     case SecCmsRecipientInfoIDKeyAgree:
 407         versionitem = &(ri->ri.keyAgreeRecipientInfo.version);
 408         break;
 409     }
 410
 411     PORT_Assert(versionitem);
 412     if (versionitem == NULL)
 413         return 0;
 414
 415     /* always take apart the SecAsn1Item */
 416     if (SEC_ASN1DecodeInteger(versionitem, &version) != SECSuccess)
 417         return 0;
 418     else
 419         return (int)version;
 420 }
 421
 422 SecAsn1Item *
 423 SecCmsRecipientInfoGetEncryptedKey(SecCmsRecipientInfoRef ri, int subIndex)
 424 {
 425     SecAsn1Item * enckey = NULL;
 426
 427     switch (ri->recipientInfoType) {
 428     case SecCmsRecipientInfoIDKeyTrans:
 429         /* ignore subIndex */
 430         enckey = &(ri->ri.keyTransRecipientInfo.encKey);
 431         break;
 432     case SecCmsRecipientInfoIDKEK:
 433         /* ignore subIndex */
 434         enckey = &(ri->ri.kekRecipientInfo.encKey);
 435         break;
 436     case SecCmsRecipientInfoIDKeyAgree:
 437         enckey = &(ri->ri.keyAgreeRecipientInfo.recipientEncryptedKeys[subIndex]->encKey);
 438         break;
 439     }
 440     return enckey;
 441 }
 442
 443
 444 SECOidTag
 445 SecCmsRecipientInfoGetKeyEncryptionAlgorithmTag(SecCmsRecipientInfoRef ri)
 446 {
 447     SECOidTag encalgtag = SEC_OID_UNKNOWN; /* an invalid encryption alg */
 448
 449     switch (ri->recipientInfoType) {
 450     case SecCmsRecipientInfoIDKeyTrans:
 451         encalgtag = SECOID_GetAlgorithmTag(&(ri->ri.keyTransRecipientInfo.keyEncAlg));
 452         break;
 453     case SecCmsRecipientInfoIDKeyAgree:
 454         encalgtag = SECOID_GetAlgorithmTag(&(ri->ri.keyAgreeRecipientInfo.keyEncAlg));
 455         break;
 456     case SecCmsRecipientInfoIDKEK:
 457         encalgtag = SECOID_GetAlgorithmTag(&(ri->ri.kekRecipientInfo.keyEncAlg));
 458         break;
 459     }
 460     return encalgtag;
 461 }
 462
 463 OSStatus
 464 SecCmsRecipientInfoWrapBulkKey(SecCmsRecipientInfoRef ri, SecSymmetricKeyRef bulkkey,
 465                                  SECOidTag bulkalgtag)
 466 {
 467     SecCertificateRef cert;
 468     SECOidTag certalgtag;
 469     OSStatus rv = SECSuccess;
 470     SecCmsRecipientEncryptedKey *rek;
 471     SecCmsOriginatorIdentifierOrKey *oiok;
 472     const SECAlgorithmID *algid;
 473     SECAlgorithmID freeAlgID;
 474     PLArenaPool *poolp;
 475     uint8_t nullData[2] = {SEC_ASN1_NULL, 0};
 476     SECItem nullItem;
 477     SecCmsKeyAgreeRecipientInfo *kari;
 478
 479     poolp = ri->envelopedData->contentInfo.cmsg->poolp;
 480     cert = ri->cert;
 481     if (cert) {
 482         const SecAsn1AlgId *length_data_swapped = (const SecAsn1AlgId *)SecCertificateGetPublicKeyAlgorithm(cert);
 483         freeAlgID.algorithm.Length = (size_t)length_data_swapped->algorithm.Data;
 484         freeAlgID.algorithm.Data = (uint8_t *)length_data_swapped->algorithm.Length;
 485         freeAlgID.parameters.Length = (size_t)length_data_swapped->parameters.Data;
 486         freeAlgID.parameters.Data = (uint8_t *)length_data_swapped->parameters.Length;
 487         algid = &freeAlgID;
 488     } else {
 489         PORT_SetError(SEC_ERROR_INVALID_ARGS);
 490         return SECFailure;
 491     }
 492
 493     /* XXX set ri->recipientInfoType to the proper value here */
 494     /* or should we look if it's been set already ? */
 495
 496     certalgtag = SECOID_GetAlgorithmTag(algid);
 497     switch (certalgtag) {
 498         case SEC_OID_PKCS1_RSA_ENCRYPTION:
 499             /* wrap the symkey */
 500             if (cert) {
 501                 rv = SecCmsUtilEncryptSymKeyRSA(poolp, cert, bulkkey,
 502                                                 &ri->ri.keyTransRecipientInfo.encKey);
 503                 if (rv != SECSuccess)
 504                     break;
 505             }
 506
 507             rv = SECOID_SetAlgorithmID(poolp, &(ri->ri.keyTransRecipientInfo.keyEncAlg), certalgtag, NULL);
 508             break;
 509         case SEC_OID_EC_PUBLIC_KEY:
 510             /* These were set up in nss_cmsrecipientinfo_create() */
 511             kari = &ri->ri.keyAgreeRecipientInfo;
 512             rek = kari->recipientEncryptedKeys[0];
 513             if (rek == NULL) {
 514                 rv = SECFailure;
 515                 break;
 516             }
 517
 518             oiok = &(kari->originatorIdentifierOrKey);
 519             PORT_Assert(oiok->identifierType == SecCmsOriginatorIDOrKeyOriginatorPublicKey);
 520
 521             /*
 522              * RFC 3278 3.1.1 says this AlgId must contain NULL params which is contrary to
 523              * any other use of the SEC_OID_EC_PUBLIC_KEY OID. So we provide one
 524              * explicitly instead of mucking up the login in SECOID_SetAlgorithmID().
 525              */
 526             nullItem.Data = nullData;
 527             nullItem.Length = 2;
 528             if (SECOID_SetAlgorithmID(poolp, &oiok->id.originatorPublicKey.algorithmIdentifier,
 529                                       SEC_OID_EC_PUBLIC_KEY, &nullItem) != SECSuccess) {
 530                 rv = SECFailure;
 531                 break;
 532             }
 533             /* this will generate a key pair, compute the shared secret, */
 534             /* derive a key and ukm for the keyEncAlg out of it, encrypt the bulk key with */
 535             /* the keyEncAlg, set encKey, keyEncAlg, publicKey etc. */
 536             rv = SecCmsUtilEncryptSymKeyECDH(poolp, cert, bulkkey,
 537                                              &rek->encKey,
 538                                              &kari->ukm,
 539                                              &kari->keyEncAlg,
 540                                              &oiok->id.originatorPublicKey.publicKey);
 541             break;
 542         default:
 543             /* other algorithms not supported yet */
 544             /* NOTE that we do not support any KEK algorithm */
 545             PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
 546             rv = SECFailure;
 547             break;
 548     }
 549
 550     return rv;
 551 }
 552
 553 #ifdef  NDEBUG
 554 #define dprintf(args...)
 555 #else
 556 #define dprintf(args...)    fprintf(stderr, args)
 557 #endif
 558
 559 SecSymmetricKeyRef
 560 SecCmsRecipientInfoUnwrapBulkKey(SecCmsRecipientInfoRef ri, int subIndex,
 561         SecCertificateRef cert, SecPrivateKeyRef privkey, SECOidTag bulkalgtag)
 562 {
 563     SecSymmetricKeyRef bulkkey = NULL;
 564     SECAlgorithmID *encalg;
 565     SECOidTag encalgtag;
 566     SecAsn1Item * enckey;
 567     int error;
 568
 569     ri->cert = CERT_DupCertificate(cert);
 570     /* mark the recipientInfo so we can find it later */
 571
 572     switch (ri->recipientInfoType) {
 573         case SecCmsRecipientInfoIDKeyTrans:
 574             encalgtag = SECOID_GetAlgorithmTag(&(ri->ri.keyTransRecipientInfo.keyEncAlg));
 575             enckey = &(ri->ri.keyTransRecipientInfo.encKey); /* ignore subIndex */
 576             switch (encalgtag) {
 577                 case SEC_OID_PKCS1_RSA_ENCRYPTION:
 578                     /* RSA encryption algorithm: */
 579                     /* get the symmetric (bulk) key by unwrapping it using our private key */
 580                     bulkkey = SecCmsUtilDecryptSymKeyRSA(privkey, enckey, bulkalgtag);
 581                     break;
 582                 default:
 583                     error = SEC_ERROR_UNSUPPORTED_KEYALG;
 584                     goto loser;
 585             }
 586             break;
 587         case SecCmsRecipientInfoIDKeyAgree:
 588             encalgtag = SECOID_GetAlgorithmTag(&(ri->ri.keyAgreeRecipientInfo.keyEncAlg));
 589             switch (encalgtag) {
 590                 case SEC_OID_X942_DIFFIE_HELMAN_KEY:
 591                     /* Diffie-Helman key exchange */
 592                     /* XXX not yet implemented */
 593                     /* XXX problem: SEC_OID_X942_DIFFIE_HELMAN_KEY points to a PKCS3 mechanism! */
 594                     /* we support ephemeral-static DH only, so if the recipientinfo */
 595                     /* has originator stuff in it, we punt (or do we? shouldn't be that hard...) */
 596                     /* first, we derive the KEK (a symkey!) using a Derive operation, then we get the */
 597                     /* content encryption key using a Unwrap op */
 598                     /* the derive operation has to generate the key using the algorithm in RFC2631 */
 599                     error = SEC_ERROR_UNSUPPORTED_KEYALG;
 600                     goto loser;
 601                 case SEC_OID_DH_SINGLE_STD_SHA1KDF:
 602                 {
 603                     /* ephemeral-static ECDH */
 604                     enckey = &(ri->ri.keyAgreeRecipientInfo.recipientEncryptedKeys[subIndex]->encKey);
 605                     encalg = &(ri->ri.keyAgreeRecipientInfo.keyEncAlg);
 606                     SecCmsKeyAgreeRecipientInfo *kari = &ri->ri.keyAgreeRecipientInfo;
 607                     SecCmsOriginatorIdentifierOrKey *oiok = &kari->originatorIdentifierOrKey;
 608                     if(oiok->identifierType != SecCmsOriginatorIDOrKeyOriginatorPublicKey) {
 609                         dprintf("SEC_OID_EC_PUBLIC_KEY unwrap key: bad oiok.id\n");
 610                         error = SEC_ERROR_LIBRARY_FAILURE;
 611                         goto loser;
 612                     }
 613                     SecCmsOriginatorPublicKey *opk = &oiok->id.originatorPublicKey;
 614                     /* FIXME - verify opk->algorithmIdentifier here? */
 615                     SecAsn1Item senderPubKey = opk->publicKey;
 616                     SecAsn1Item *ukm = &kari->ukm;
 617                     bulkkey = SecCmsUtilDecryptSymKeyECDH(privkey, enckey, ukm, encalg, bulkalgtag, &senderPubKey);
 618                     break;
 619                 }
 620                 default:
 621                     error = SEC_ERROR_UNSUPPORTED_KEYALG;
 622                     goto loser;
 623             }
 624             break;
 625         case SecCmsRecipientInfoIDKEK:
 626             /* not supported yet */
 627             error = SEC_ERROR_UNSUPPORTED_KEYALG;
 628             goto loser;
 629     }
 630     /* XXXX continue here */
 631     return bulkkey;
 632
 633 loser:
 634     PORT_SetError(error);
 635     return NULL;
 636 }