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Make CHANGES in CVS head consistent with the CHANGES files in the
[thirdparty/openssl.git] / crypto / cms / cms_env.c
CommitLineData
8931b30d
DSH		 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>
5c4436c9 60#include <openssl/rand.h>
6e3bc4f0 61#include <openssl/aes.h>
8931b30d
DSH		 62#include "cms_lcl.h"
63#include "asn1_locl.h"
64
65/* CMS EnvelopedData Utilities */
66
67DECLARE_ASN1_ITEM(CMS_EnvelopedData)
68DECLARE_ASN1_ITEM(CMS_RecipientInfo)
69DECLARE_ASN1_ITEM(CMS_KeyTransRecipientInfo)
c36e936b
DSH		 70DECLARE_ASN1_ITEM(CMS_KEKRecipientInfo)
71DECLARE_ASN1_ITEM(CMS_OtherKeyAttribute)
8931b30d 72
8931b30d
DSH		 73DECLARE_STACK_OF(CMS_RecipientInfo)
74
75static CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
76 {
77 if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped)
78 {
79 CMSerr(CMS_F_CMS_GET0_ENVELOPED,
80 CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
81 return NULL;
82 }
83 return cms->d.envelopedData;
84 }
85
86static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
87 {
88 if (cms->d.other == NULL)
89 {
90 cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
91 if (!cms->d.envelopedData)
92 {
93 CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT,
94 ERR_R_MALLOC_FAILURE);
95 return NULL;
96 }
97 cms->d.envelopedData->version = 0;
98 cms->d.envelopedData->encryptedContentInfo->contentType =
99 OBJ_nid2obj(NID_pkcs7_data);
100 ASN1_OBJECT_free(cms->contentType);
101 cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
102 return cms->d.envelopedData;
103 }
104 return cms_get0_enveloped(cms);
105 }
106
4f1aa191
DSH		 107STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
108 {
109 CMS_EnvelopedData *env;
761ffa72 110 env = cms_get0_enveloped(cms);
4f1aa191
DSH		 111 if (!env)
112 return NULL;
113 return env->recipientInfos;
114 }
115
116int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
117 {
118 return ri->type;
119 }
120
761ffa72
DSH		 121CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
122 {
123 CMS_ContentInfo *cms;
124 CMS_EnvelopedData *env;
125 cms = CMS_ContentInfo_new();
126 if (!cms)
127 goto merr;
128 env = cms_enveloped_data_init(cms);
129 if (!env)
130 goto merr;
131 if (!cms_EncryptedContent_init(env->encryptedContentInfo,
132 cipher, NULL, 0))
133 goto merr;
134 return cms;
135 merr:
136 if (cms)
137 CMS_ContentInfo_free(cms);
138 CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
139 return NULL;
140 }
141
ab124380
DSH		 142/* Key Transport Recipient Info (KTRI) routines */
143
8931b30d
DSH		 144/* Add a recipient certificate. For now only handle key transport.
145 * If we ever handle key agreement will need updating.
146 */
ab124380 147
8931b30d
DSH		 148CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
149 X509 *recip, unsigned int flags)
150 {
151 CMS_RecipientInfo *ri = NULL;
152 CMS_KeyTransRecipientInfo *ktri;
153 CMS_EnvelopedData *env;
154 EVP_PKEY *pk = NULL;
155 int i, type;
761ffa72 156 env = cms_get0_enveloped(cms);
8931b30d
DSH		 157 if (!env)
158 goto err;
159
761ffa72 160 /* Initialize recipient info */
8931b30d
DSH		 161 ri = M_ASN1_new_of(CMS_RecipientInfo);
162 if (!ri)
163 goto merr;
164
761ffa72 165 /* Initialize and add key transport recipient info */
8931b30d
DSH		 166
167 ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
168 if (!ri->d.ktri)
169 goto merr;
170 ri->type = CMS_RECIPINFO_TRANS;
171
172 ktri = ri->d.ktri;
173
174 X509_check_purpose(recip, -1, -1);
175 pk = X509_get_pubkey(recip);
176 if (!pk)
177 {
178 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
179 CMS_R_ERROR_GETTING_PUBLIC_KEY);
180 goto err;
181 }
182 CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509);
8931b30d
DSH		 183 ktri->pkey = pk;
184 ktri->recip = recip;
185
186 if (flags & CMS_USE_KEYID)
187 {
188 ktri->version = 2;
189 type = CMS_RECIPINFO_KEYIDENTIFIER;
190 }
191 else
192 {
193 ktri->version = 0;
194 type = CMS_RECIPINFO_ISSUER_SERIAL;
195 }
196
197 /* Not a typo: RecipientIdentifier and SignerIdentifier are the
198 * same structure.
199 */
200
201 if (!cms_set1_SignerIdentifier(ktri->rid, recip, type))
202 goto err;
203
204 if (pk->ameth && pk->ameth->pkey_ctrl)
205 {
206 i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_ENVELOPE,
207 0, ri);
208 if (i == -2)
209 {
210 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
211 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
212 goto err;
213 }
214 if (i <= 0)
215 {
216 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
217 CMS_R_CTRL_FAILURE);
218 goto err;
219 }
220 }
221
222 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
223 goto merr;
224
225 return ri;
226
227 merr:
228 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
229 err:
230 if (ri)
231 M_ASN1_free_of(ri, CMS_RecipientInfo);
232 return NULL;
233
234 }
235
236int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
237 EVP_PKEY **pk, X509 **recip,
238 X509_ALGOR **palg)
239 {
240 CMS_KeyTransRecipientInfo *ktri;
241 if (ri->type != CMS_RECIPINFO_TRANS)
242 {
243 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
244 CMS_R_NOT_KEY_TRANSPORT);
245 return 0;
246 }
247
248 ktri = ri->d.ktri;
249
250 if (pk)
251 *pk = ktri->pkey;
252 if (recip)
253 *recip = ktri->recip;
254 if (palg)
255 *palg = ktri->keyEncryptionAlgorithm;
256 return 1;
257 }
258
259int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
260 ASN1_OCTET_STRING **keyid,
261 X509_NAME **issuer, ASN1_INTEGER **sno)
262 {
263 CMS_KeyTransRecipientInfo *ktri;
264 if (ri->type != CMS_RECIPINFO_TRANS)
265 {
266 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
267 CMS_R_NOT_KEY_TRANSPORT);
268 return 0;
269 }
4f1aa191 270 ktri = ri->d.ktri;
8931b30d
DSH		 271
272 return cms_SignerIdentifier_get0_signer_id(ktri->rid,
273 keyid, issuer, sno);
274 }
275
276int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
277 {
8931b30d
DSH		 278 if (ri->type != CMS_RECIPINFO_TRANS)
279 {
280 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
281 CMS_R_NOT_KEY_TRANSPORT);
4f1aa191
DSH		 282 return -2;
283 }
4f1aa191
DSH		 284 return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
285 }
286
6e3bc4f0
DSH		 287int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
288 {
289 if (ri->type != CMS_RECIPINFO_TRANS)
290 {
291 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY,
292 CMS_R_NOT_KEY_TRANSPORT);
293 return 0;
294 }
295 ri->d.ktri->pkey = pkey;
296 return 1;
297 }
298
761ffa72
DSH		 299/* Encrypt content key in key transport recipient info */
300
301static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
302 CMS_RecipientInfo *ri)
303 {
304 CMS_KeyTransRecipientInfo *ktri;
305 CMS_EncryptedContentInfo *ec;
306 EVP_PKEY_CTX *pctx = NULL;
307 unsigned char *ek = NULL;
308 size_t eklen;
309
310 int ret = 0;
311
312 if (ri->type != CMS_RECIPINFO_TRANS)
313 {
314 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
315 CMS_R_NOT_KEY_TRANSPORT);
316 return 0;
317 }
318 ktri = ri->d.ktri;
319 ec = cms->d.envelopedData->encryptedContentInfo;
320
321 pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
322 if (!pctx)
323 return 0;
324
325 if (EVP_PKEY_encrypt_init(pctx) <= 0)
326 goto err;
327
328 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
329 EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0)
330 {
331 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
332 goto err;
333 }
334
335 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
336 goto err;
337
338 ek = OPENSSL_malloc(eklen);
339
340 if (ek == NULL)
341 {
342 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
343 ERR_R_MALLOC_FAILURE);
344 goto err;
345 }
346
347 if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
348 goto err;
349
350 ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
351 ek = NULL;
352
353 ret = 1;
354
355 err:
356 if (pctx)
357 EVP_PKEY_CTX_free(pctx);
358 if (ek)
359 OPENSSL_free(ek);
360 return ret;
361
362 }
363
ab124380
DSH		 364/* Decrypt content key from KTRI */
365
6e3bc4f0
DSH		 366static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
367 CMS_RecipientInfo *ri)
4f1aa191 368 {
6e3bc4f0 369 CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
4f1aa191
DSH		 370 EVP_PKEY_CTX *pctx = NULL;
371 unsigned char *ek = NULL;
372 size_t eklen;
f7e85c37 373 int ret = 0;
4f1aa191 374
6e3bc4f0 375 if (ktri->pkey == NULL)
4f1aa191 376 {
6e3bc4f0
DSH		 377 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
378 CMS_R_NO_PRIVATE_KEY);
4f1aa191
DSH		 379 return 0;
380 }
4f1aa191 381
6e3bc4f0 382 pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
4f1aa191 383 if (!pctx)
8931b30d 384 return 0;
4f1aa191
DSH		 385
386 if (EVP_PKEY_decrypt_init(pctx) <= 0)
387 goto err;
388
389 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
390 EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0)
391 {
6e3bc4f0 392 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
4f1aa191 393 goto err;
8931b30d
DSH		 394 }
395
4f1aa191
DSH		 396 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
397 ktri->encryptedKey->data,
398 ktri->encryptedKey->length) <= 0)
399 goto err;
400
401 ek = OPENSSL_malloc(eklen);
402
403 if (ek == NULL)
404 {
6e3bc4f0
DSH		 405 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
406 ERR_R_MALLOC_FAILURE);
4f1aa191
DSH		 407 goto err;
408 }
409
410 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
411 ktri->encryptedKey->data,
412 ktri->encryptedKey->length) <= 0)
413 {
6e3bc4f0 414 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
4f1aa191
DSH		 415 goto err;
416 }
417
418 ret = 1;
419
420 cms->d.envelopedData->encryptedContentInfo->key = ek;
421 cms->d.envelopedData->encryptedContentInfo->keylen = eklen;
422
423 err:
424 if (pctx)
425 EVP_PKEY_CTX_free(pctx);
426 if (!ret && ek)
427 OPENSSL_free(ek);
428
429 return ret;
430 }
431
ab124380
DSH		 432/* Key Encrypted Key (KEK) RecipientInfo routines */
433
eeb9cdfc
DSH		 434int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
435 const unsigned char *id, size_t idlen)
436 {
437 ASN1_OCTET_STRING tmp_os;
438 CMS_KEKRecipientInfo *kekri;
439 if (ri->type != CMS_RECIPINFO_KEK)
440 {
441 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
442 return -2;
443 }
444 kekri = ri->d.kekri;
445 tmp_os.type = V_ASN1_OCTET_STRING;
446 tmp_os.flags = 0;
447 tmp_os.data = (unsigned char *)id;
448 tmp_os.length = (int)idlen;
449 return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
450 }
451
ab124380
DSH		 452/* For now hard code AES key wrap info */
453
454static size_t aes_wrap_keylen(int nid)
455 {
456 switch (nid)
457 {
458 case NID_id_aes128_wrap:
459 return 16;
460
461 case NID_id_aes192_wrap:
462 return 24;
463
464 case NID_id_aes256_wrap:
465 return 32;
466
467 default:
468 return 0;
469 }
470 }
471
472CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
473 unsigned char *key, size_t keylen,
474 unsigned char *id, size_t idlen,
475 ASN1_GENERALIZEDTIME *date,
476 ASN1_OBJECT *otherTypeId,
477 ASN1_TYPE *otherType)
478 {
479 CMS_RecipientInfo *ri = NULL;
480 CMS_EnvelopedData *env;
481 CMS_KEKRecipientInfo *kekri;
482 env = cms_get0_enveloped(cms);
483 if (!env)
484 goto err;
485
486 if (nid == NID_undef)
487 {
488 switch (keylen)
489 {
490 case 16:
491 nid = NID_id_aes128_wrap;
492 break;
493
494 case 24:
495 nid = NID_id_aes192_wrap;
496 break;
497
498 case 32:
499 nid = NID_id_aes256_wrap;
500 break;
501
502 default:
503 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
504 CMS_R_INVALID_KEY_LENGTH);
505 goto err;
506 }
507
508 }
509 else
510 {
511
512 size_t exp_keylen = aes_wrap_keylen(nid);
513
514 if (!exp_keylen)
515 {
516 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
517 CMS_R_UNSUPPORTED_KEK_ALGORITHM);
518 goto err;
519 }
520
521 if (keylen != exp_keylen)
522 {
523 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
524 CMS_R_INVALID_KEY_LENGTH);
525 goto err;
526 }
527
528 }
529
530 /* Initialize recipient info */
531 ri = M_ASN1_new_of(CMS_RecipientInfo);
532 if (!ri)
533 goto merr;
534
535 ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
536 if (!ri->d.kekri)
537 goto merr;
538 ri->type = CMS_RECIPINFO_KEK;
539
540 kekri = ri->d.kekri;
541
542 if (otherTypeId)
543 {
544 kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
545 if (kekri->kekid->other == NULL)
546 goto merr;
547 }
548
549 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
550 goto merr;
551
552
553 /* After this point no calls can fail */
554
555 kekri->version = 4;
556
557 kekri->key = key;
558 kekri->keylen = keylen;
559
560 ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
561
562 kekri->kekid->date = date;
563
564 if (kekri->kekid->other)
565 {
566 kekri->kekid->other->keyAttrId = otherTypeId;
567 kekri->kekid->other->keyAttr = otherType;
568 }
569
570 X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
571 OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
572
573 return ri;
574
575 merr:
576 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
577 err:
578 if (ri)
579 M_ASN1_free_of(ri, CMS_RecipientInfo);
580 return NULL;
581
582 }
583
584int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
585 X509_ALGOR **palg,
586 ASN1_OCTET_STRING **pid,
587 ASN1_GENERALIZEDTIME **pdate,
588 ASN1_OBJECT **potherid,
589 ASN1_TYPE **pothertype)
590 {
591 CMS_KEKIdentifier *rkid;
592 if (ri->type != CMS_RECIPINFO_KEK)
593 {
594 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
595 return 0;
596 }
597 rkid = ri->d.kekri->kekid;
598 if (palg)
599 *palg = ri->d.kekri->keyEncryptionAlgorithm;
600 if (pid)
601 *pid = rkid->keyIdentifier;
602 if (pdate)
603 *pdate = rkid->date;
604 if (potherid)
605 {
606 if (rkid->other)
607 *potherid = rkid->other->keyAttrId;
608 else
609 *potherid = NULL;
610 }
611 if (pothertype)
612 {
613 if (rkid->other)
614 *pothertype = rkid->other->keyAttr;
615 else
616 *pothertype = NULL;
617 }
618 return 1;
619 }
ab124380
DSH		 620
621int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
622 unsigned char *key, size_t keylen)
623 {
624 CMS_KEKRecipientInfo *kekri;
ab124380
DSH		 625 if (ri->type != CMS_RECIPINFO_KEK)
626 {
627 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
628 return 0;
629 }
eeb9cdfc 630
ab124380 631 kekri = ri->d.kekri;
ab124380
DSH		 632 kekri->key = key;
633 kekri->keylen = keylen;
634 return 1;
635 }
636
6e3bc4f0
DSH		 637
638/* Encrypt content key in KEK recipient info */
639
640static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
641 CMS_RecipientInfo *ri)
642 {
643 CMS_EncryptedContentInfo *ec;
644 CMS_KEKRecipientInfo *kekri;
645 AES_KEY actx;
646 unsigned char *wkey = NULL;
647 int wkeylen;
648 int r = 0;
649
650 ec = cms->d.envelopedData->encryptedContentInfo;
651
652 kekri = ri->d.kekri;
653
654 if (!kekri->key)
655 {
656 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
657 return 0;
658 }
659
660 if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx))
661 {
662 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
663 CMS_R_ERROR_SETTING_KEY);
664 goto err;
665 }
666
667 wkey = OPENSSL_malloc(ec->keylen + 8);
668
669 if (!wkey)
670 {
671 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
672 ERR_R_MALLOC_FAILURE);
673 goto err;
674 }
675
676 wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
677
678 if (wkeylen <= 0)
679 {
680 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
681 goto err;
682 }
683
684 ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
685
686 r = 1;
687
688 err:
689
690 if (!r && wkey)
691 OPENSSL_free(wkey);
692 OPENSSL_cleanse(&actx, sizeof(actx));
693
694 return r;
695
696 }
697
ab124380
DSH		 698/* Decrypt content key in KEK recipient info */
699
6e3bc4f0
DSH		 700static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
701 CMS_RecipientInfo *ri)
702 {
703 CMS_EncryptedContentInfo *ec;
704 CMS_KEKRecipientInfo *kekri;
705 AES_KEY actx;
706 unsigned char *ukey = NULL;
707 int ukeylen;
eeb9cdfc 708 int r = 0, wrap_nid;
6e3bc4f0
DSH		 709
710 ec = cms->d.envelopedData->encryptedContentInfo;
711
712 kekri = ri->d.kekri;
713
714 if (!kekri->key)
715 {
716 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
717 return 0;
718 }
719
eeb9cdfc
DSH		 720 wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
721 if (aes_wrap_keylen(wrap_nid) != kekri->keylen)
722 {
723 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
724 CMS_R_INVALID_KEY_LENGTH);
725 return 0;
726 }
727
6e3bc4f0
DSH		 728 /* If encrypted key length is invalid don't bother */
729
730 if (kekri->encryptedKey->length < 16)
731 {
732 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
733 CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
734 goto err;
735 }
736
737 if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx))
738 {
739 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
740 CMS_R_ERROR_SETTING_KEY);
741 goto err;
742 }
743
744 ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
745
746 if (!ukey)
747 {
748 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
749 ERR_R_MALLOC_FAILURE);
750 goto err;
751 }
752
753 ukeylen = AES_unwrap_key(&actx, NULL, ukey,
754 kekri->encryptedKey->data,
755 kekri->encryptedKey->length);
756
757 if (ukeylen <= 0)
758 {
759 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
760 CMS_R_UNWRAP_ERROR);
761 goto err;
762 }
763
764 ec->key = ukey;
765 ec->keylen = ukeylen;
766
767 r = 1;
768
769 err:
770
771 if (!r && ukey)
772 OPENSSL_free(ukey);
773 OPENSSL_cleanse(&actx, sizeof(actx));
774
775 return r;
776
777 }
778
779int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
780 {
781 switch(ri->type)
782 {
783 case CMS_RECIPINFO_TRANS:
784 return cms_RecipientInfo_ktri_decrypt(cms, ri);
785
786 case CMS_RECIPINFO_KEK:
787 return cms_RecipientInfo_kekri_decrypt(cms, ri);
788
789 default:
790 CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
791 CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
792 return 0;
793 }
794 }
795
4f1aa191
DSH		 796BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
797 {
798 CMS_EncryptedContentInfo *ec;
761ffa72
DSH		 799 STACK_OF(CMS_RecipientInfo) *rinfos;
800 CMS_RecipientInfo *ri;
801 int i, r, ok = 0;
802 BIO *ret;
803
804 /* Get BIO first to set up key */
805
4f1aa191 806 ec = cms->d.envelopedData->encryptedContentInfo;
761ffa72
DSH		 807 ret = cms_EncryptedContent_init_bio(ec);
808
809 /* If error or no cipher end of processing */
810
811 if (!ret || !ec->cipher)
812 return ret;
813
ab124380
DSH		 814 /* Now encrypt content key according to each RecipientInfo type */
815
761ffa72
DSH		 816 rinfos = cms->d.envelopedData->recipientInfos;
817
818 for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++)
819 {
820 ri = sk_CMS_RecipientInfo_value(rinfos, i);
6e3bc4f0
DSH		 821
822 switch (ri->type)
761ffa72 823 {
6e3bc4f0
DSH		 824 case CMS_RECIPINFO_TRANS:
825 r = cms_RecipientInfo_ktri_encrypt(cms, ri);
826 break;
827
828 case CMS_RECIPINFO_KEK:
829 r = cms_RecipientInfo_kekri_encrypt(cms, ri);
830 break;
831
832 default:
761ffa72
DSH		 833 CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
834 CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
835 goto err;
836 }
6e3bc4f0 837
761ffa72
DSH		 838 if (r <= 0)
839 {
840 CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
841 CMS_R_ERROR_SETTING_RECIPIENTINFO);
842 goto err;
843 }
844 }
845
846 ok = 1;
847
848 err:
849 ec->cipher = NULL;
850 if (ec->key)
851 {
852 OPENSSL_cleanse(ec->key, ec->keylen);
853 OPENSSL_free(ec->key);
854 ec->key = NULL;
855 ec->keylen = 0;
856 }
857 if (ok)
858 return ret;
859 BIO_free(ret);
860 return NULL;
861
8931b30d 862 }
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