crypto/openssl-0.9/crypto/cms/cms_env.c

   1 /* crypto/cms/cms_env.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 "cryptlib.h"
  55 #include <openssl/asn1t.h>
  56 #include <openssl/pem.h>
  57 #include <openssl/x509v3.h>
  58 #include <openssl/err.h>
  59 #include <openssl/cms.h>
  60 #include <openssl/rand.h>
  61 #include <openssl/aes.h>
  62 #include "cms_lcl.h"
  63
  64 /* CMS EnvelopedData Utilities */
  65
  66 DECLARE_ASN1_ITEM(CMS_EnvelopedData)
  67 DECLARE_ASN1_ITEM(CMS_RecipientInfo)
  68 DECLARE_ASN1_ITEM(CMS_KeyTransRecipientInfo)
  69 DECLARE_ASN1_ITEM(CMS_KEKRecipientInfo)
  70 DECLARE_ASN1_ITEM(CMS_OtherKeyAttribute)
  71
  72 DECLARE_STACK_OF(CMS_RecipientInfo)
  73
  74 static CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
  75         {
  76         if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped)
  77                 {
  78                 CMSerr(CMS_F_CMS_GET0_ENVELOPED,
  79                                 CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
  80                 return NULL;
  81                 }
  82         return cms->d.envelopedData;
  83         }
  84
  85 static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
  86         {
  87         if (cms->d.other == NULL)
  88                 {
  89                 cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
  90                 if (!cms->d.envelopedData)
  91                         {
  92                         CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT,
  93                                                         ERR_R_MALLOC_FAILURE);
  94                         return NULL;
  95                         }
  96                 cms->d.envelopedData->version = 0;
  97                 cms->d.envelopedData->encryptedContentInfo->contentType =
  98                                                 OBJ_nid2obj(NID_pkcs7_data);
  99                 ASN1_OBJECT_free(cms->contentType);
 100                 cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
 101                 return cms->d.envelopedData;
 102                 }
 103         return cms_get0_enveloped(cms);
 104         }
 105
 106 STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
 107         {
 108         CMS_EnvelopedData *env;
 109         env = cms_get0_enveloped(cms);
 110         if (!env)
 111                 return NULL;
 112         return env->recipientInfos;
 113         }
 114
 115 int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
 116         {
 117         return ri->type;
 118         }
 119
 120 CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
 121         {
 122         CMS_ContentInfo *cms;
 123         CMS_EnvelopedData *env;
 124         cms = CMS_ContentInfo_new();
 125         if (!cms)
 126                 goto merr;
 127         env = cms_enveloped_data_init(cms);
 128         if (!env)
 129                 goto merr;
 130         if (!cms_EncryptedContent_init(env->encryptedContentInfo,
 131                                         cipher, NULL, 0))
 132                 goto merr;
 133         return cms;
 134         merr:
 135         if (cms)
 136                 CMS_ContentInfo_free(cms);
 137         CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
 138         return NULL;
 139         }
 140
 141 /* Key Transport Recipient Info (KTRI) routines */
 142
 143 /* Add a recipient certificate. For now only handle key transport.
 144  * If we ever handle key agreement will need updating.
 145  */
 146
 147 CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
 148                                         X509 *recip, unsigned int flags)
 149         {
 150         CMS_RecipientInfo *ri = NULL;
 151         CMS_KeyTransRecipientInfo *ktri;
 152         CMS_EnvelopedData *env;
 153         EVP_PKEY *pk = NULL;
 154         int type;
 155         env = cms_get0_enveloped(cms);
 156         if (!env)
 157                 goto err;
 158
 159         /* Initialize recipient info */
 160         ri = M_ASN1_new_of(CMS_RecipientInfo);
 161         if (!ri)
 162                 goto merr;
 163
 164         /* Initialize and add key transport recipient info */
 165
 166         ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
 167         if (!ri->d.ktri)
 168                 goto merr;
 169         ri->type = CMS_RECIPINFO_TRANS;
 170
 171         ktri = ri->d.ktri;
 172
 173         X509_check_purpose(recip, -1, -1);
 174         pk = X509_get_pubkey(recip);
 175         if (!pk)
 176                 {
 177                 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
 178                                 CMS_R_ERROR_GETTING_PUBLIC_KEY);
 179                 goto err;
 180                 }
 181         CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509);
 182         ktri->pkey = pk;
 183         ktri->recip = recip;
 184
 185         if (flags & CMS_USE_KEYID)
 186                 {
 187                 ktri->version = 2;
 188                 type = CMS_RECIPINFO_KEYIDENTIFIER;
 189                 }
 190         else
 191                 {
 192                 ktri->version = 0;
 193                 type = CMS_RECIPINFO_ISSUER_SERIAL;
 194                 }
 195
 196         /* Not a typo: RecipientIdentifier and SignerIdentifier are the
 197          * same structure.
 198          */
 199
 200         if (!cms_set1_SignerIdentifier(ktri->rid, recip, type))
 201                 goto err;
 202
 203         /* Since we have no EVP_PKEY_ASN1_METHOD in OpenSSL 0.9.8,
 204          * hard code algorithm parameters.
 205          */
 206
 207         if (pk->type == EVP_PKEY_RSA)
 208                 {
 209                 X509_ALGOR_set0(ktri->keyEncryptionAlgorithm,
 210                                         OBJ_nid2obj(NID_rsaEncryption),
 211                                         V_ASN1_NULL, 0);
 212                 }
 213         else
 214                 {
 215                 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
 216                                 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 217                 goto err;
 218                 }
 219
 220         if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 221                 goto merr;
 222
 223         return ri;
 224
 225         merr:
 226         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
 227         err:
 228         if (ri)
 229                 M_ASN1_free_of(ri, CMS_RecipientInfo);
 230         return NULL;
 231
 232         }
 233
 234 int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
 235                                         EVP_PKEY **pk, X509 **recip,
 236                                         X509_ALGOR **palg)
 237         {
 238         CMS_KeyTransRecipientInfo *ktri;
 239         if (ri->type != CMS_RECIPINFO_TRANS)
 240                 {
 241                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
 242                         CMS_R_NOT_KEY_TRANSPORT);
 243                 return 0;
 244                 }
 245
 246         ktri = ri->d.ktri;
 247
 248         if (pk)
 249                 *pk = ktri->pkey;
 250         if (recip)
 251                 *recip = ktri->recip;
 252         if (palg)
 253                 *palg = ktri->keyEncryptionAlgorithm;
 254         return 1;
 255         }
 256
 257 int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
 258                                         ASN1_OCTET_STRING **keyid,
 259                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 260         {
 261         CMS_KeyTransRecipientInfo *ktri;
 262         if (ri->type != CMS_RECIPINFO_TRANS)
 263                 {
 264                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
 265                         CMS_R_NOT_KEY_TRANSPORT);
 266                 return 0;
 267                 }
 268         ktri = ri->d.ktri;
 269
 270         return cms_SignerIdentifier_get0_signer_id(ktri->rid,
 271                                                         keyid, issuer, sno);
 272         }
 273
 274 int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
 275         {
 276         if (ri->type != CMS_RECIPINFO_TRANS)
 277                 {
 278                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
 279                         CMS_R_NOT_KEY_TRANSPORT);
 280                 return -2;
 281                 }
 282         return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
 283         }
 284
 285 int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
 286         {
 287         if (ri->type != CMS_RECIPINFO_TRANS)
 288                 {
 289                 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY,
 290                         CMS_R_NOT_KEY_TRANSPORT);
 291                 return 0;
 292                 }
 293         ri->d.ktri->pkey = pkey;
 294         return 1;
 295         }
 296
 297 /* Encrypt content key in key transport recipient info */
 298
 299 static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
 300                                         CMS_RecipientInfo *ri)
 301         {
 302         CMS_KeyTransRecipientInfo *ktri;
 303         CMS_EncryptedContentInfo *ec;
 304         unsigned char *ek = NULL;
 305         int eklen;
 306
 307         int ret = 0;
 308
 309         if (ri->type != CMS_RECIPINFO_TRANS)
 310                 {
 311                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
 312                         CMS_R_NOT_KEY_TRANSPORT);
 313                 return 0;
 314                 }
 315         ktri = ri->d.ktri;
 316         ec = cms->d.envelopedData->encryptedContentInfo;
 317
 318         eklen = EVP_PKEY_size(ktri->pkey);
 319
 320         ek = OPENSSL_malloc(eklen);
 321
 322         if (ek == NULL)
 323                 {
 324                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
 325                                                         ERR_R_MALLOC_FAILURE);
 326                 goto err;
 327                 }
 328
 329         eklen = EVP_PKEY_encrypt(ek, ec->key, ec->keylen, ktri->pkey);
 330
 331         if (eklen <= 0)
 332                 goto err;
 333
 334         ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
 335         ek = NULL;
 336
 337         ret = 1;
 338
 339         err:
 340         if (ek)
 341                 OPENSSL_free(ek);
 342         return ret;
 343
 344         }
 345
 346 /* Decrypt content key from KTRI */
 347
 348 static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
 349                                                         CMS_RecipientInfo *ri)
 350         {
 351         CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
 352         unsigned char *ek = NULL;
 353         int eklen;
 354         int ret = 0;
 355
 356         if (ktri->pkey == NULL)
 357                 {
 358                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
 359                         CMS_R_NO_PRIVATE_KEY);
 360                 return 0;
 361                 }
 362
 363         eklen = EVP_PKEY_size(ktri->pkey);
 364
 365         ek = OPENSSL_malloc(eklen);
 366
 367         if (ek == NULL)
 368                 {
 369                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
 370                                                         ERR_R_MALLOC_FAILURE);
 371                 goto err;
 372                 }
 373
 374         eklen = EVP_PKEY_decrypt(ek,
 375                                 ktri->encryptedKey->data,
 376                                 ktri->encryptedKey->length, ktri->pkey);
 377         if (eklen <= 0)
 378                 {
 379                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
 380                 goto err;
 381                 }
 382
 383         ret = 1;
 384
 385         cms->d.envelopedData->encryptedContentInfo->key = ek;
 386         cms->d.envelopedData->encryptedContentInfo->keylen = eklen;
 387
 388         err:
 389         if (!ret && ek)
 390                 OPENSSL_free(ek);
 391
 392         return ret;
 393         }
 394
 395 /* Key Encrypted Key (KEK) RecipientInfo routines */
 396
 397 int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
 398                                         const unsigned char *id, size_t idlen)
 399         {
 400         ASN1_OCTET_STRING tmp_os;
 401         CMS_KEKRecipientInfo *kekri;
 402         if (ri->type != CMS_RECIPINFO_KEK)
 403                 {
 404                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
 405                 return -2;
 406                 }
 407         kekri = ri->d.kekri;
 408         tmp_os.type = V_ASN1_OCTET_STRING;
 409         tmp_os.flags = 0;
 410         tmp_os.data = (unsigned char *)id;
 411         tmp_os.length = (int)idlen;
 412         return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
 413         }
 414
 415 /* For now hard code AES key wrap info */
 416
 417 static size_t aes_wrap_keylen(int nid)
 418         {
 419         switch (nid)
 420                 {
 421                 case NID_id_aes128_wrap:
 422                 return 16;
 423
 424                 case NID_id_aes192_wrap:
 425                 return  24;
 426
 427                 case NID_id_aes256_wrap:
 428                 return  32;
 429
 430                 default:
 431                 return 0;
 432                 }
 433         }
 434
 435 CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
 436                                         unsigned char *key, size_t keylen,
 437                                         unsigned char *id, size_t idlen,
 438                                         ASN1_GENERALIZEDTIME *date,
 439                                         ASN1_OBJECT *otherTypeId,
 440                                         ASN1_TYPE *otherType)
 441         {
 442         CMS_RecipientInfo *ri = NULL;
 443         CMS_EnvelopedData *env;
 444         CMS_KEKRecipientInfo *kekri;
 445         env = cms_get0_enveloped(cms);
 446         if (!env)
 447                 goto err;
 448
 449         if (nid == NID_undef)
 450                 {
 451                 switch (keylen)
 452                         {
 453                         case 16:
 454                         nid = NID_id_aes128_wrap;
 455                         break;
 456
 457                         case  24:
 458                         nid = NID_id_aes192_wrap;
 459                         break;
 460
 461                         case  32:
 462                         nid = NID_id_aes256_wrap;
 463                         break;
 464
 465                         default:
 466                         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
 467                                                 CMS_R_INVALID_KEY_LENGTH);
 468                         goto err;
 469                         }
 470
 471                 }
 472         else
 473                 {
 474
 475                 size_t exp_keylen = aes_wrap_keylen(nid);
 476
 477                 if (!exp_keylen)
 478                         {
 479                         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
 480                                         CMS_R_UNSUPPORTED_KEK_ALGORITHM);
 481                         goto err;
 482                         }
 483
 484                 if (keylen != exp_keylen)
 485                         {
 486                         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
 487                                         CMS_R_INVALID_KEY_LENGTH);
 488                         goto err;
 489                         }
 490
 491                 }
 492
 493         /* Initialize recipient info */
 494         ri = M_ASN1_new_of(CMS_RecipientInfo);
 495         if (!ri)
 496                 goto merr;
 497
 498         ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
 499         if (!ri->d.kekri)
 500                 goto merr;
 501         ri->type = CMS_RECIPINFO_KEK;
 502
 503         kekri = ri->d.kekri;
 504
 505         if (otherTypeId)
 506                 {
 507                 kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
 508                 if (kekri->kekid->other == NULL)
 509                         goto merr;
 510                 }
 511
 512         if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 513                 goto merr;
 514
 515
 516         /* After this point no calls can fail */
 517
 518         kekri->version = 4;
 519
 520         kekri->key = key;
 521         kekri->keylen = keylen;
 522
 523         ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
 524
 525         kekri->kekid->date = date;
 526
 527         if (kekri->kekid->other)
 528                 {
 529                 kekri->kekid->other->keyAttrId = otherTypeId;
 530                 kekri->kekid->other->keyAttr = otherType;
 531                 }
 532
 533         X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
 534                                 OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
 535
 536         return ri;
 537
 538         merr:
 539         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
 540         err:
 541         if (ri)
 542                 M_ASN1_free_of(ri, CMS_RecipientInfo);
 543         return NULL;
 544
 545         }
 546
 547 int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
 548                                         X509_ALGOR **palg,
 549                                         ASN1_OCTET_STRING **pid,
 550                                         ASN1_GENERALIZEDTIME **pdate,
 551                                         ASN1_OBJECT **potherid,
 552                                         ASN1_TYPE **pothertype)
 553         {
 554         CMS_KEKIdentifier *rkid;
 555         if (ri->type != CMS_RECIPINFO_KEK)
 556                 {
 557                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
 558                 return 0;
 559                 }
 560         rkid =  ri->d.kekri->kekid;
 561         if (palg)
 562                 *palg = ri->d.kekri->keyEncryptionAlgorithm;
 563         if (pid)
 564                 *pid = rkid->keyIdentifier;
 565         if (pdate)
 566                 *pdate = rkid->date;
 567         if (potherid)
 568                 {
 569                 if (rkid->other)
 570                         *potherid = rkid->other->keyAttrId;
 571                 else
 572                         *potherid = NULL;
 573                 }
 574         if (pothertype)
 575                 {
 576                 if (rkid->other)
 577                         *pothertype = rkid->other->keyAttr;
 578                 else
 579                         *pothertype = NULL;
 580                 }
 581         return 1;
 582         }
 583
 584 int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
 585                                 unsigned char *key, size_t keylen)
 586         {
 587         CMS_KEKRecipientInfo *kekri;
 588         if (ri->type != CMS_RECIPINFO_KEK)
 589                 {
 590                 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
 591                 return 0;
 592                 }
 593
 594         kekri = ri->d.kekri;
 595         kekri->key = key;
 596         kekri->keylen = keylen;
 597         return 1;
 598         }
 599
 600
 601 /* Encrypt content key in KEK recipient info */
 602
 603 static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
 604                                         CMS_RecipientInfo *ri)
 605         {
 606         CMS_EncryptedContentInfo *ec;
 607         CMS_KEKRecipientInfo *kekri;
 608         AES_KEY actx;
 609         unsigned char *wkey = NULL;
 610         int wkeylen;
 611         int r = 0;
 612
 613         ec = cms->d.envelopedData->encryptedContentInfo;
 614
 615         kekri = ri->d.kekri;
 616
 617         if (!kekri->key)
 618                 {
 619                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
 620                 return 0;
 621                 }
 622
 623         if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx))
 624                 {
 625                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
 626                                                 CMS_R_ERROR_SETTING_KEY);
 627                 goto err;
 628                 }
 629
 630         wkey = OPENSSL_malloc(ec->keylen + 8);
 631
 632         if (!wkey)
 633                 {
 634                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
 635                                                 ERR_R_MALLOC_FAILURE);
 636                 goto err;
 637                 }
 638
 639         wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
 640
 641         if (wkeylen <= 0)
 642                 {
 643                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
 644                 goto err;
 645                 }
 646
 647         ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
 648
 649         r = 1;
 650
 651         err:
 652
 653         if (!r && wkey)
 654                 OPENSSL_free(wkey);
 655         OPENSSL_cleanse(&actx, sizeof(actx));
 656
 657         return r;
 658
 659         }
 660
 661 /* Decrypt content key in KEK recipient info */
 662
 663 static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
 664                                         CMS_RecipientInfo *ri)
 665         {
 666         CMS_EncryptedContentInfo *ec;
 667         CMS_KEKRecipientInfo *kekri;
 668         AES_KEY actx;
 669         unsigned char *ukey = NULL;
 670         int ukeylen;
 671         int r = 0, wrap_nid;
 672
 673         ec = cms->d.envelopedData->encryptedContentInfo;
 674
 675         kekri = ri->d.kekri;
 676
 677         if (!kekri->key)
 678                 {
 679                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
 680                 return 0;
 681                 }
 682
 683         wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
 684         if (aes_wrap_keylen(wrap_nid) != kekri->keylen)
 685                 {
 686                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 687                         CMS_R_INVALID_KEY_LENGTH);
 688                 return 0;
 689                 }
 690
 691         /* If encrypted key length is invalid don't bother */
 692
 693         if (kekri->encryptedKey->length < 16)
 694                 {
 695                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 696                                         CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
 697                 goto err;
 698                 }
 699
 700         if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx))
 701                 {
 702                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 703                                                 CMS_R_ERROR_SETTING_KEY);
 704                 goto err;
 705                 }
 706
 707         ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
 708
 709         if (!ukey)
 710                 {
 711                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 712                                                 ERR_R_MALLOC_FAILURE);
 713                 goto err;
 714                 }
 715
 716         ukeylen = AES_unwrap_key(&actx, NULL, ukey,
 717                                         kekri->encryptedKey->data,
 718                                         kekri->encryptedKey->length);
 719
 720         if (ukeylen <= 0)
 721                 {
 722                 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 723                                                         CMS_R_UNWRAP_ERROR);
 724                 goto err;
 725                 }
 726
 727         ec->key = ukey;
 728         ec->keylen = ukeylen;
 729
 730         r = 1;
 731
 732         err:
 733
 734         if (!r && ukey)
 735                 OPENSSL_free(ukey);
 736         OPENSSL_cleanse(&actx, sizeof(actx));
 737
 738         return r;
 739
 740         }
 741
 742 int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 743         {
 744         switch(ri->type)
 745                 {
 746                 case CMS_RECIPINFO_TRANS:
 747                 return cms_RecipientInfo_ktri_decrypt(cms, ri);
 748
 749                 case CMS_RECIPINFO_KEK:
 750                 return cms_RecipientInfo_kekri_decrypt(cms, ri);
 751
 752                 default:
 753                 CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
 754                         CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
 755                 return 0;
 756                 }
 757         }
 758
 759 BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
 760         {
 761         CMS_EncryptedContentInfo *ec;
 762         STACK_OF(CMS_RecipientInfo) *rinfos;
 763         CMS_RecipientInfo *ri;
 764         int i, r, ok = 0;
 765         BIO *ret;
 766
 767         /* Get BIO first to set up key */
 768
 769         ec = cms->d.envelopedData->encryptedContentInfo;
 770         ret = cms_EncryptedContent_init_bio(ec);
 771
 772         /* If error or no cipher end of processing */
 773
 774         if (!ret || !ec->cipher)
 775                 return ret;
 776
 777         /* Now encrypt content key according to each RecipientInfo type */
 778
 779         rinfos = cms->d.envelopedData->recipientInfos;
 780
 781         for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++)
 782                 {
 783                 ri = sk_CMS_RecipientInfo_value(rinfos, i);
 784
 785                 switch (ri->type)
 786                         {
 787                         case CMS_RECIPINFO_TRANS:
 788                         r = cms_RecipientInfo_ktri_encrypt(cms, ri);
 789                         break;
 790
 791                         case CMS_RECIPINFO_KEK:
 792                         r = cms_RecipientInfo_kekri_encrypt(cms, ri);
 793                         break;
 794
 795                         default:
 796                         CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
 797                                 CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
 798                         goto err;
 799                         }
 800
 801                 if (r <= 0)
 802                         {
 803                         CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
 804                                 CMS_R_ERROR_SETTING_RECIPIENTINFO);
 805                         goto err;
 806                         }
 807                 }
 808
 809         ok = 1;
 810
 811         err:
 812         ec->cipher = NULL;
 813         if (ec->key)
 814                 {
 815                 OPENSSL_cleanse(ec->key, ec->keylen);
 816                 OPENSSL_free(ec->key);
 817                 ec->key = NULL;
 818                 ec->keylen = 0;
 819                 }
 820         if (ok)
 821                 return ret;
 822         BIO_free(ret);
 823         return NULL;
 824
 825         }