crypto/cms/cms_env.c

   1 /* crypto/cms/cms_env.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  */
  54
  55 #include "cryptlib.h"
  56 #include <openssl/asn1t.h>
  57 #include <openssl/pem.h>
  58 #include <openssl/x509v3.h>
  59 #include <openssl/err.h>
  60 #include <openssl/cms.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/aes.h>
  63 #include "cms_lcl.h"
  64 #include "internal/asn1_int.h"
  65
  66 /* CMS EnvelopedData Utilities */
  67
  68 DECLARE_ASN1_ITEM(CMS_EnvelopedData)
  69 DECLARE_ASN1_ITEM(CMS_KeyTransRecipientInfo)
  70 DECLARE_ASN1_ITEM(CMS_KEKRecipientInfo)
  71 DECLARE_ASN1_ITEM(CMS_OtherKeyAttribute)
  72
  73 DECLARE_STACK_OF(CMS_RecipientInfo)
  74
  75 CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
  76 {
  77     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
  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         cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
  89         if (!cms->d.envelopedData) {
  90             CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  91             return NULL;
  92         }
  93         cms->d.envelopedData->version = 0;
  94         cms->d.envelopedData->encryptedContentInfo->contentType =
  95             OBJ_nid2obj(NID_pkcs7_data);
  96         ASN1_OBJECT_free(cms->contentType);
  97         cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
  98         return cms->d.envelopedData;
  99     }
 100     return cms_get0_enveloped(cms);
 101 }
 102
 103 int cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
 104 {
 105     EVP_PKEY *pkey;
 106     int i;
 107     if (ri->type == CMS_RECIPINFO_TRANS)
 108         pkey = ri->d.ktri->pkey;
 109     else if (ri->type == CMS_RECIPINFO_AGREE) {
 110         EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
 111         if (!pctx)
 112             return 0;
 113         pkey = EVP_PKEY_CTX_get0_pkey(pctx);
 114         if (!pkey)
 115             return 0;
 116     } else
 117         return 0;
 118     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 119         return 1;
 120     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
 121     if (i == -2) {
 122         CMSerr(CMS_F_CMS_ENV_ASN1_CTRL,
 123                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 124         return 0;
 125     }
 126     if (i <= 0) {
 127         CMSerr(CMS_F_CMS_ENV_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 128         return 0;
 129     }
 130     return 1;
 131 }
 132
 133 STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
 134 {
 135     CMS_EnvelopedData *env;
 136     env = cms_get0_enveloped(cms);
 137     if (!env)
 138         return NULL;
 139     return env->recipientInfos;
 140 }
 141
 142 int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
 143 {
 144     return ri->type;
 145 }
 146
 147 EVP_PKEY_CTX *CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
 148 {
 149     if (ri->type == CMS_RECIPINFO_TRANS)
 150         return ri->d.ktri->pctx;
 151     else if (ri->type == CMS_RECIPINFO_AGREE)
 152         return ri->d.kari->pctx;
 153     return NULL;
 154 }
 155
 156 CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
 157 {
 158     CMS_ContentInfo *cms;
 159     CMS_EnvelopedData *env;
 160     cms = CMS_ContentInfo_new();
 161     if (!cms)
 162         goto merr;
 163     env = cms_enveloped_data_init(cms);
 164     if (!env)
 165         goto merr;
 166     if (!cms_EncryptedContent_init(env->encryptedContentInfo,
 167                                    cipher, NULL, 0))
 168         goto merr;
 169     return cms;
 170  merr:
 171     if (cms)
 172         CMS_ContentInfo_free(cms);
 173     CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
 174     return NULL;
 175 }
 176
 177 /* Key Transport Recipient Info (KTRI) routines */
 178
 179 /* Initialise a ktri based on passed certificate and key */
 180
 181 static int cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip,
 182                                        EVP_PKEY *pk, unsigned int flags)
 183 {
 184     CMS_KeyTransRecipientInfo *ktri;
 185     int idtype;
 186
 187     ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
 188     if (!ri->d.ktri)
 189         return 0;
 190     ri->type = CMS_RECIPINFO_TRANS;
 191
 192     ktri = ri->d.ktri;
 193
 194     if (flags & CMS_USE_KEYID) {
 195         ktri->version = 2;
 196         idtype = CMS_RECIPINFO_KEYIDENTIFIER;
 197     } else {
 198         ktri->version = 0;
 199         idtype = CMS_RECIPINFO_ISSUER_SERIAL;
 200     }
 201
 202     /*
 203      * Not a typo: RecipientIdentifier and SignerIdentifier are the same
 204      * structure.
 205      */
 206
 207     if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
 208         return 0;
 209
 210     CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509);
 211     CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 212     ktri->pkey = pk;
 213     ktri->recip = recip;
 214
 215     if (flags & CMS_KEY_PARAM) {
 216         ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
 217         if (!ktri->pctx)
 218             return 0;
 219         if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
 220             return 0;
 221     } else if (!cms_env_asn1_ctrl(ri, 0))
 222         return 0;
 223     return 1;
 224 }
 225
 226 /*
 227  * Add a recipient certificate using appropriate type of RecipientInfo
 228  */
 229
 230 CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
 231                                            X509 *recip, unsigned int flags)
 232 {
 233     CMS_RecipientInfo *ri = NULL;
 234     CMS_EnvelopedData *env;
 235     EVP_PKEY *pk = NULL;
 236     env = cms_get0_enveloped(cms);
 237     if (!env)
 238         goto err;
 239
 240     /* Initialize recipient info */
 241     ri = M_ASN1_new_of(CMS_RecipientInfo);
 242     if (!ri)
 243         goto merr;
 244
 245     pk = X509_get_pubkey(recip);
 246     if (!pk) {
 247         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, CMS_R_ERROR_GETTING_PUBLIC_KEY);
 248         goto err;
 249     }
 250
 251     switch (cms_pkey_get_ri_type(pk)) {
 252
 253     case CMS_RECIPINFO_TRANS:
 254         if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
 255             goto err;
 256         break;
 257
 258     case CMS_RECIPINFO_AGREE:
 259         if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
 260             goto err;
 261         break;
 262
 263     default:
 264         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
 265                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 266         goto err;
 267
 268     }
 269
 270     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 271         goto merr;
 272
 273     EVP_PKEY_free(pk);
 274
 275     return ri;
 276
 277  merr:
 278     CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
 279  err:
 280     M_ASN1_free_of(ri, CMS_RecipientInfo);
 281     EVP_PKEY_free(pk);
 282     return NULL;
 283
 284 }
 285
 286 int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
 287                                      EVP_PKEY **pk, X509 **recip,
 288                                      X509_ALGOR **palg)
 289 {
 290     CMS_KeyTransRecipientInfo *ktri;
 291     if (ri->type != CMS_RECIPINFO_TRANS) {
 292         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
 293                CMS_R_NOT_KEY_TRANSPORT);
 294         return 0;
 295     }
 296
 297     ktri = ri->d.ktri;
 298
 299     if (pk)
 300         *pk = ktri->pkey;
 301     if (recip)
 302         *recip = ktri->recip;
 303     if (palg)
 304         *palg = ktri->keyEncryptionAlgorithm;
 305     return 1;
 306 }
 307
 308 int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
 309                                           ASN1_OCTET_STRING **keyid,
 310                                           X509_NAME **issuer,
 311                                           ASN1_INTEGER **sno)
 312 {
 313     CMS_KeyTransRecipientInfo *ktri;
 314     if (ri->type != CMS_RECIPINFO_TRANS) {
 315         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
 316                CMS_R_NOT_KEY_TRANSPORT);
 317         return 0;
 318     }
 319     ktri = ri->d.ktri;
 320
 321     return cms_SignerIdentifier_get0_signer_id(ktri->rid, keyid, issuer, sno);
 322 }
 323
 324 int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
 325 {
 326     if (ri->type != CMS_RECIPINFO_TRANS) {
 327         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
 328                CMS_R_NOT_KEY_TRANSPORT);
 329         return -2;
 330     }
 331     return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
 332 }
 333
 334 int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
 335 {
 336     if (ri->type != CMS_RECIPINFO_TRANS) {
 337         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY, CMS_R_NOT_KEY_TRANSPORT);
 338         return 0;
 339     }
 340     ri->d.ktri->pkey = pkey;
 341     return 1;
 342 }
 343
 344 /* Encrypt content key in key transport recipient info */
 345
 346 static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
 347                                           CMS_RecipientInfo *ri)
 348 {
 349     CMS_KeyTransRecipientInfo *ktri;
 350     CMS_EncryptedContentInfo *ec;
 351     EVP_PKEY_CTX *pctx;
 352     unsigned char *ek = NULL;
 353     size_t eklen;
 354
 355     int ret = 0;
 356
 357     if (ri->type != CMS_RECIPINFO_TRANS) {
 358         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_NOT_KEY_TRANSPORT);
 359         return 0;
 360     }
 361     ktri = ri->d.ktri;
 362     ec = cms->d.envelopedData->encryptedContentInfo;
 363
 364     pctx = ktri->pctx;
 365
 366     if (pctx) {
 367         if (!cms_env_asn1_ctrl(ri, 0))
 368             goto err;
 369     } else {
 370         pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
 371         if (!pctx)
 372             return 0;
 373
 374         if (EVP_PKEY_encrypt_init(pctx) <= 0)
 375             goto err;
 376     }
 377
 378     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 379                           EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) {
 380         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
 381         goto err;
 382     }
 383
 384     if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
 385         goto err;
 386
 387     ek = OPENSSL_malloc(eklen);
 388
 389     if (ek == NULL) {
 390         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
 391         goto err;
 392     }
 393
 394     if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
 395         goto err;
 396
 397     ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
 398     ek = NULL;
 399
 400     ret = 1;
 401
 402  err:
 403     if (pctx) {
 404         EVP_PKEY_CTX_free(pctx);
 405         ktri->pctx = NULL;
 406     }
 407     if (ek)
 408         OPENSSL_free(ek);
 409     return ret;
 410
 411 }
 412
 413 /* Decrypt content key from KTRI */
 414
 415 static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
 416                                           CMS_RecipientInfo *ri)
 417 {
 418     CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
 419     EVP_PKEY *pkey = ktri->pkey;
 420     unsigned char *ek = NULL;
 421     size_t eklen;
 422     int ret = 0;
 423     CMS_EncryptedContentInfo *ec;
 424     ec = cms->d.envelopedData->encryptedContentInfo;
 425
 426     if (ktri->pkey == NULL) {
 427         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_NO_PRIVATE_KEY);
 428         return 0;
 429     }
 430
 431     ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
 432     if (!ktri->pctx)
 433         return 0;
 434
 435     if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
 436         goto err;
 437
 438     if (!cms_env_asn1_ctrl(ri, 1))
 439         goto err;
 440
 441     if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
 442                           EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) {
 443         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
 444         goto err;
 445     }
 446
 447     if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
 448                          ktri->encryptedKey->data,
 449                          ktri->encryptedKey->length) <= 0)
 450         goto err;
 451
 452     ek = OPENSSL_malloc(eklen);
 453
 454     if (ek == NULL) {
 455         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, ERR_R_MALLOC_FAILURE);
 456         goto err;
 457     }
 458
 459     if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
 460                          ktri->encryptedKey->data,
 461                          ktri->encryptedKey->length) <= 0) {
 462         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
 463         goto err;
 464     }
 465
 466     ret = 1;
 467
 468     OPENSSL_clear_free(ec->key, ec->keylen);
 469     ec->key = ek;
 470     ec->keylen = eklen;
 471
 472  err:
 473     EVP_PKEY_CTX_free(ktri->pctx);
 474     ktri->pctx = NULL;
 475     if (!ret && ek)
 476         OPENSSL_free(ek);
 477
 478     return ret;
 479 }
 480
 481 /* Key Encrypted Key (KEK) RecipientInfo routines */
 482
 483 int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
 484                                    const unsigned char *id, size_t idlen)
 485 {
 486     ASN1_OCTET_STRING tmp_os;
 487     CMS_KEKRecipientInfo *kekri;
 488     if (ri->type != CMS_RECIPINFO_KEK) {
 489         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
 490         return -2;
 491     }
 492     kekri = ri->d.kekri;
 493     tmp_os.type = V_ASN1_OCTET_STRING;
 494     tmp_os.flags = 0;
 495     tmp_os.data = (unsigned char *)id;
 496     tmp_os.length = (int)idlen;
 497     return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
 498 }
 499
 500 /* For now hard code AES key wrap info */
 501
 502 static size_t aes_wrap_keylen(int nid)
 503 {
 504     switch (nid) {
 505     case NID_id_aes128_wrap:
 506         return 16;
 507
 508     case NID_id_aes192_wrap:
 509         return 24;
 510
 511     case NID_id_aes256_wrap:
 512         return 32;
 513
 514     default:
 515         return 0;
 516     }
 517 }
 518
 519 CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
 520                                           unsigned char *key, size_t keylen,
 521                                           unsigned char *id, size_t idlen,
 522                                           ASN1_GENERALIZEDTIME *date,
 523                                           ASN1_OBJECT *otherTypeId,
 524                                           ASN1_TYPE *otherType)
 525 {
 526     CMS_RecipientInfo *ri = NULL;
 527     CMS_EnvelopedData *env;
 528     CMS_KEKRecipientInfo *kekri;
 529     env = cms_get0_enveloped(cms);
 530     if (!env)
 531         goto err;
 532
 533     if (nid == NID_undef) {
 534         switch (keylen) {
 535         case 16:
 536             nid = NID_id_aes128_wrap;
 537             break;
 538
 539         case 24:
 540             nid = NID_id_aes192_wrap;
 541             break;
 542
 543         case 32:
 544             nid = NID_id_aes256_wrap;
 545             break;
 546
 547         default:
 548             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
 549             goto err;
 550         }
 551
 552     } else {
 553
 554         size_t exp_keylen = aes_wrap_keylen(nid);
 555
 556         if (!exp_keylen) {
 557             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
 558                    CMS_R_UNSUPPORTED_KEK_ALGORITHM);
 559             goto err;
 560         }
 561
 562         if (keylen != exp_keylen) {
 563             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
 564             goto err;
 565         }
 566
 567     }
 568
 569     /* Initialize recipient info */
 570     ri = M_ASN1_new_of(CMS_RecipientInfo);
 571     if (!ri)
 572         goto merr;
 573
 574     ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
 575     if (!ri->d.kekri)
 576         goto merr;
 577     ri->type = CMS_RECIPINFO_KEK;
 578
 579     kekri = ri->d.kekri;
 580
 581     if (otherTypeId) {
 582         kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
 583         if (kekri->kekid->other == NULL)
 584             goto merr;
 585     }
 586
 587     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 588         goto merr;
 589
 590     /* After this point no calls can fail */
 591
 592     kekri->version = 4;
 593
 594     kekri->key = key;
 595     kekri->keylen = keylen;
 596
 597     ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
 598
 599     kekri->kekid->date = date;
 600
 601     if (kekri->kekid->other) {
 602         kekri->kekid->other->keyAttrId = otherTypeId;
 603         kekri->kekid->other->keyAttr = otherType;
 604     }
 605
 606     X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
 607                     OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
 608
 609     return ri;
 610
 611  merr:
 612     CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
 613  err:
 614     M_ASN1_free_of(ri, CMS_RecipientInfo);
 615     return NULL;
 616
 617 }
 618
 619 int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
 620                                     X509_ALGOR **palg,
 621                                     ASN1_OCTET_STRING **pid,
 622                                     ASN1_GENERALIZEDTIME **pdate,
 623                                     ASN1_OBJECT **potherid,
 624                                     ASN1_TYPE **pothertype)
 625 {
 626     CMS_KEKIdentifier *rkid;
 627     if (ri->type != CMS_RECIPINFO_KEK) {
 628         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
 629         return 0;
 630     }
 631     rkid = ri->d.kekri->kekid;
 632     if (palg)
 633         *palg = ri->d.kekri->keyEncryptionAlgorithm;
 634     if (pid)
 635         *pid = rkid->keyIdentifier;
 636     if (pdate)
 637         *pdate = rkid->date;
 638     if (potherid) {
 639         if (rkid->other)
 640             *potherid = rkid->other->keyAttrId;
 641         else
 642             *potherid = NULL;
 643     }
 644     if (pothertype) {
 645         if (rkid->other)
 646             *pothertype = rkid->other->keyAttr;
 647         else
 648             *pothertype = NULL;
 649     }
 650     return 1;
 651 }
 652
 653 int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
 654                                unsigned char *key, size_t keylen)
 655 {
 656     CMS_KEKRecipientInfo *kekri;
 657     if (ri->type != CMS_RECIPINFO_KEK) {
 658         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
 659         return 0;
 660     }
 661
 662     kekri = ri->d.kekri;
 663     kekri->key = key;
 664     kekri->keylen = keylen;
 665     return 1;
 666 }
 667
 668 /* Encrypt content key in KEK recipient info */
 669
 670 static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
 671                                            CMS_RecipientInfo *ri)
 672 {
 673     CMS_EncryptedContentInfo *ec;
 674     CMS_KEKRecipientInfo *kekri;
 675     AES_KEY actx;
 676     unsigned char *wkey = NULL;
 677     int wkeylen;
 678     int r = 0;
 679
 680     ec = cms->d.envelopedData->encryptedContentInfo;
 681
 682     kekri = ri->d.kekri;
 683
 684     if (!kekri->key) {
 685         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
 686         return 0;
 687     }
 688
 689     if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
 690         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
 691                CMS_R_ERROR_SETTING_KEY);
 692         goto err;
 693     }
 694
 695     wkey = OPENSSL_malloc(ec->keylen + 8);
 696
 697     if (!wkey) {
 698         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
 699         goto err;
 700     }
 701
 702     wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
 703
 704     if (wkeylen <= 0) {
 705         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
 706         goto err;
 707     }
 708
 709     ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
 710
 711     r = 1;
 712
 713  err:
 714
 715     if (!r && wkey)
 716         OPENSSL_free(wkey);
 717     OPENSSL_cleanse(&actx, sizeof(actx));
 718
 719     return r;
 720
 721 }
 722
 723 /* Decrypt content key in KEK recipient info */
 724
 725 static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
 726                                            CMS_RecipientInfo *ri)
 727 {
 728     CMS_EncryptedContentInfo *ec;
 729     CMS_KEKRecipientInfo *kekri;
 730     AES_KEY actx;
 731     unsigned char *ukey = NULL;
 732     int ukeylen;
 733     int r = 0, wrap_nid;
 734
 735     ec = cms->d.envelopedData->encryptedContentInfo;
 736
 737     kekri = ri->d.kekri;
 738
 739     if (!kekri->key) {
 740         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
 741         return 0;
 742     }
 743
 744     wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
 745     if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
 746         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 747                CMS_R_INVALID_KEY_LENGTH);
 748         return 0;
 749     }
 750
 751     /* If encrypted key length is invalid don't bother */
 752
 753     if (kekri->encryptedKey->length < 16) {
 754         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 755                CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
 756         goto err;
 757     }
 758
 759     if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
 760         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 761                CMS_R_ERROR_SETTING_KEY);
 762         goto err;
 763     }
 764
 765     ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
 766
 767     if (!ukey) {
 768         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, ERR_R_MALLOC_FAILURE);
 769         goto err;
 770     }
 771
 772     ukeylen = AES_unwrap_key(&actx, NULL, ukey,
 773                              kekri->encryptedKey->data,
 774                              kekri->encryptedKey->length);
 775
 776     if (ukeylen <= 0) {
 777         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_UNWRAP_ERROR);
 778         goto err;
 779     }
 780
 781     ec->key = ukey;
 782     ec->keylen = ukeylen;
 783
 784     r = 1;
 785
 786  err:
 787
 788     if (!r && ukey)
 789         OPENSSL_free(ukey);
 790     OPENSSL_cleanse(&actx, sizeof(actx));
 791
 792     return r;
 793
 794 }
 795
 796 int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 797 {
 798     switch (ri->type) {
 799     case CMS_RECIPINFO_TRANS:
 800         return cms_RecipientInfo_ktri_decrypt(cms, ri);
 801
 802     case CMS_RECIPINFO_KEK:
 803         return cms_RecipientInfo_kekri_decrypt(cms, ri);
 804
 805     case CMS_RECIPINFO_PASS:
 806         return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
 807
 808     default:
 809         CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
 810                CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
 811         return 0;
 812     }
 813 }
 814
 815 int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 816 {
 817     switch (ri->type) {
 818     case CMS_RECIPINFO_TRANS:
 819         return cms_RecipientInfo_ktri_encrypt(cms, ri);
 820
 821     case CMS_RECIPINFO_AGREE:
 822         return cms_RecipientInfo_kari_encrypt(cms, ri);
 823
 824     case CMS_RECIPINFO_KEK:
 825         return cms_RecipientInfo_kekri_encrypt(cms, ri);
 826
 827     case CMS_RECIPINFO_PASS:
 828         return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
 829
 830     default:
 831         CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
 832                CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
 833         return 0;
 834     }
 835 }
 836
 837 /* Check structures and fixup version numbers (if necessary) */
 838
 839 static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
 840 {
 841     CMS_OriginatorInfo *org = env->originatorInfo;
 842     int i;
 843     if (org == NULL)
 844         return;
 845     for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
 846         CMS_CertificateChoices *cch;
 847         cch = sk_CMS_CertificateChoices_value(org->certificates, i);
 848         if (cch->type == CMS_CERTCHOICE_OTHER) {
 849             env->version = 4;
 850             return;
 851         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
 852             if (env->version < 3)
 853                 env->version = 3;
 854         }
 855     }
 856
 857     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
 858         CMS_RevocationInfoChoice *rch;
 859         rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
 860         if (rch->type == CMS_REVCHOICE_OTHER) {
 861             env->version = 4;
 862             return;
 863         }
 864     }
 865 }
 866
 867 static void cms_env_set_version(CMS_EnvelopedData *env)
 868 {
 869     int i;
 870     CMS_RecipientInfo *ri;
 871
 872     /*
 873      * Can't set version higher than 4 so if 4 or more already nothing to do.
 874      */
 875     if (env->version >= 4)
 876         return;
 877
 878     cms_env_set_originfo_version(env);
 879
 880     if (env->version >= 3)
 881         return;
 882
 883     for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
 884         ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
 885         if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER) {
 886             env->version = 3;
 887             return;
 888         } else if (ri->type != CMS_RECIPINFO_TRANS
 889                    || ri->d.ktri->version != 0) {
 890             env->version = 2;
 891         }
 892     }
 893     if (env->version == 2)
 894         return;
 895     if (env->originatorInfo || env->unprotectedAttrs)
 896         env->version = 2;
 897     env->version = 0;
 898 }
 899
 900 BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
 901 {
 902     CMS_EncryptedContentInfo *ec;
 903     STACK_OF(CMS_RecipientInfo) *rinfos;
 904     CMS_RecipientInfo *ri;
 905     int i, ok = 0;
 906     BIO *ret;
 907
 908     /* Get BIO first to set up key */
 909
 910     ec = cms->d.envelopedData->encryptedContentInfo;
 911     ret = cms_EncryptedContent_init_bio(ec);
 912
 913     /* If error or no cipher end of processing */
 914
 915     if (!ret || !ec->cipher)
 916         return ret;
 917
 918     /* Now encrypt content key according to each RecipientInfo type */
 919
 920     rinfos = cms->d.envelopedData->recipientInfos;
 921
 922     for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
 923         ri = sk_CMS_RecipientInfo_value(rinfos, i);
 924         if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
 925             CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
 926                    CMS_R_ERROR_SETTING_RECIPIENTINFO);
 927             goto err;
 928         }
 929     }
 930     cms_env_set_version(cms->d.envelopedData);
 931
 932     ok = 1;
 933
 934  err:
 935     ec->cipher = NULL;
 936     OPENSSL_clear_free(ec->key, ec->keylen);
 937     ec->key = NULL;
 938     ec->keylen = 0;
 939     if (ok)
 940         return ret;
 941     BIO_free(ret);
 942     return NULL;
 943
 944 }
 945
 946 /*
 947  * Get RecipientInfo type (if any) supported by a key (public or private). To
 948  * retain compatibility with previous behaviour if the ctrl value isn't
 949  * supported we assume key transport.
 950  */
 951 int cms_pkey_get_ri_type(EVP_PKEY *pk)
 952 {
 953     if (pk->ameth && pk->ameth->pkey_ctrl) {
 954         int i, r;
 955         i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
 956         if (i > 0)
 957             return r;
 958     }
 959     return CMS_RECIPINFO_TRANS;
 960 }