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source: vbox/trunk/src/libs/openssl-1.1.1f/crypto/cms/cms_kari.c@ 83531

Last change on this file since 83531 was 83531, checked in by vboxsync, 5 years ago

setting svn:sync-process=export for openssl-1.1.1f, all files except tests
File size: 12.4 KB
Line 
1/*
2 * Copyright 2013-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "internal/cryptlib.h"
11#include <openssl/asn1t.h>
12#include <openssl/pem.h>
13#include <openssl/x509v3.h>
14#include <openssl/err.h>
15#include <openssl/cms.h>
16#include <openssl/aes.h>
17#include "cms_local.h"
18#include "crypto/asn1.h"
19
20/* Key Agreement Recipient Info (KARI) routines */
21
22int CMS_RecipientInfo_kari_get0_alg(CMS_RecipientInfo *ri,
23 X509_ALGOR **palg,
24 ASN1_OCTET_STRING **pukm)
25{
26 if (ri->type != CMS_RECIPINFO_AGREE) {
27 CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_GET0_ALG,
28 CMS_R_NOT_KEY_AGREEMENT);
29 return 0;
30 }
31 if (palg)
32 *palg = ri->d.kari->keyEncryptionAlgorithm;
33 if (pukm)
34 *pukm = ri->d.kari->ukm;
35 return 1;
36}
37
38/* Retrieve recipient encrypted keys from a kari */
39
40STACK_OF(CMS_RecipientEncryptedKey)
41*CMS_RecipientInfo_kari_get0_reks(CMS_RecipientInfo *ri)
42{
43 if (ri->type != CMS_RECIPINFO_AGREE) {
44 CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_GET0_REKS,
45 CMS_R_NOT_KEY_AGREEMENT);
46 return NULL;
47 }
48 return ri->d.kari->recipientEncryptedKeys;
49}
50
51int CMS_RecipientInfo_kari_get0_orig_id(CMS_RecipientInfo *ri,
52 X509_ALGOR **pubalg,
53 ASN1_BIT_STRING **pubkey,
54 ASN1_OCTET_STRING **keyid,
55 X509_NAME **issuer,
56 ASN1_INTEGER **sno)
57{
58 CMS_OriginatorIdentifierOrKey *oik;
59 if (ri->type != CMS_RECIPINFO_AGREE) {
60 CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_GET0_ORIG_ID,
61 CMS_R_NOT_KEY_AGREEMENT);
62 return 0;
63 }
64 oik = ri->d.kari->originator;
65 if (issuer)
66 *issuer = NULL;
67 if (sno)
68 *sno = NULL;
69 if (keyid)
70 *keyid = NULL;
71 if (pubalg)
72 *pubalg = NULL;
73 if (pubkey)
74 *pubkey = NULL;
75 if (oik->type == CMS_OIK_ISSUER_SERIAL) {
76 if (issuer)
77 *issuer = oik->d.issuerAndSerialNumber->issuer;
78 if (sno)
79 *sno = oik->d.issuerAndSerialNumber->serialNumber;
80 } else if (oik->type == CMS_OIK_KEYIDENTIFIER) {
81 if (keyid)
82 *keyid = oik->d.subjectKeyIdentifier;
83 } else if (oik->type == CMS_OIK_PUBKEY) {
84 if (pubalg)
85 *pubalg = oik->d.originatorKey->algorithm;
86 if (pubkey)
87 *pubkey = oik->d.originatorKey->publicKey;
88 } else
89 return 0;
90 return 1;
91}
92
93int CMS_RecipientInfo_kari_orig_id_cmp(CMS_RecipientInfo *ri, X509 *cert)
94{
95 CMS_OriginatorIdentifierOrKey *oik;
96 if (ri->type != CMS_RECIPINFO_AGREE) {
97 CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_ORIG_ID_CMP,
98 CMS_R_NOT_KEY_AGREEMENT);
99 return -2;
100 }
101 oik = ri->d.kari->originator;
102 if (oik->type == CMS_OIK_ISSUER_SERIAL)
103 return cms_ias_cert_cmp(oik->d.issuerAndSerialNumber, cert);
104 else if (oik->type == CMS_OIK_KEYIDENTIFIER)
105 return cms_keyid_cert_cmp(oik->d.subjectKeyIdentifier, cert);
106 return -1;
107}
108
109int CMS_RecipientEncryptedKey_get0_id(CMS_RecipientEncryptedKey *rek,
110 ASN1_OCTET_STRING **keyid,
111 ASN1_GENERALIZEDTIME **tm,
112 CMS_OtherKeyAttribute **other,
113 X509_NAME **issuer, ASN1_INTEGER **sno)
114{
115 CMS_KeyAgreeRecipientIdentifier *rid = rek->rid;
116 if (rid->type == CMS_REK_ISSUER_SERIAL) {
117 if (issuer)
118 *issuer = rid->d.issuerAndSerialNumber->issuer;
119 if (sno)
120 *sno = rid->d.issuerAndSerialNumber->serialNumber;
121 if (keyid)
122 *keyid = NULL;
123 if (tm)
124 *tm = NULL;
125 if (other)
126 *other = NULL;
127 } else if (rid->type == CMS_REK_KEYIDENTIFIER) {
128 if (keyid)
129 *keyid = rid->d.rKeyId->subjectKeyIdentifier;
130 if (tm)
131 *tm = rid->d.rKeyId->date;
132 if (other)
133 *other = rid->d.rKeyId->other;
134 if (issuer)
135 *issuer = NULL;
136 if (sno)
137 *sno = NULL;
138 } else
139 return 0;
140 return 1;
141}
142
143int CMS_RecipientEncryptedKey_cert_cmp(CMS_RecipientEncryptedKey *rek,
144 X509 *cert)
145{
146 CMS_KeyAgreeRecipientIdentifier *rid = rek->rid;
147 if (rid->type == CMS_REK_ISSUER_SERIAL)
148 return cms_ias_cert_cmp(rid->d.issuerAndSerialNumber, cert);
149 else if (rid->type == CMS_REK_KEYIDENTIFIER)
150 return cms_keyid_cert_cmp(rid->d.rKeyId->subjectKeyIdentifier, cert);
151 else
152 return -1;
153}
154
155int CMS_RecipientInfo_kari_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pk)
156{
157 EVP_PKEY_CTX *pctx;
158 CMS_KeyAgreeRecipientInfo *kari = ri->d.kari;
159
160 EVP_PKEY_CTX_free(kari->pctx);
161 kari->pctx = NULL;
162 if (!pk)
163 return 1;
164 pctx = EVP_PKEY_CTX_new(pk, NULL);
165 if (!pctx || EVP_PKEY_derive_init(pctx) <= 0)
166 goto err;
167 kari->pctx = pctx;
168 return 1;
169 err:
170 EVP_PKEY_CTX_free(pctx);
171 return 0;
172}
173
174EVP_CIPHER_CTX *CMS_RecipientInfo_kari_get0_ctx(CMS_RecipientInfo *ri)
175{
176 if (ri->type == CMS_RECIPINFO_AGREE)
177 return ri->d.kari->ctx;
178 return NULL;
179}
180
181/*
182 * Derive KEK and decrypt/encrypt with it to produce either the original CEK
183 * or the encrypted CEK.
184 */
185
186static int cms_kek_cipher(unsigned char **pout, size_t *poutlen,
187 const unsigned char *in, size_t inlen,
188 CMS_KeyAgreeRecipientInfo *kari, int enc)
189{
190 /* Key encryption key */
191 unsigned char kek[EVP_MAX_KEY_LENGTH];
192 size_t keklen;
193 int rv = 0;
194 unsigned char *out = NULL;
195 int outlen;
196 keklen = EVP_CIPHER_CTX_key_length(kari->ctx);
197 if (keklen > EVP_MAX_KEY_LENGTH)
198 return 0;
199 /* Derive KEK */
200 if (EVP_PKEY_derive(kari->pctx, kek, &keklen) <= 0)
201 goto err;
202 /* Set KEK in context */
203 if (!EVP_CipherInit_ex(kari->ctx, NULL, NULL, kek, NULL, enc))
204 goto err;
205 /* obtain output length of ciphered key */
206 if (!EVP_CipherUpdate(kari->ctx, NULL, &outlen, in, inlen))
207 goto err;
208 out = OPENSSL_malloc(outlen);
209 if (out == NULL)
210 goto err;
211 if (!EVP_CipherUpdate(kari->ctx, out, &outlen, in, inlen))
212 goto err;
213 *pout = out;
214 *poutlen = (size_t)outlen;
215 rv = 1;
216
217 err:
218 OPENSSL_cleanse(kek, keklen);
219 if (!rv)
220 OPENSSL_free(out);
221 EVP_CIPHER_CTX_reset(kari->ctx);
222 /* FIXME: WHY IS kari->pctx freed here? /RL */
223 EVP_PKEY_CTX_free(kari->pctx);
224 kari->pctx = NULL;
225 return rv;
226}
227
228int CMS_RecipientInfo_kari_decrypt(CMS_ContentInfo *cms,
229 CMS_RecipientInfo *ri,
230 CMS_RecipientEncryptedKey *rek)
231{
232 int rv = 0;
233 unsigned char *enckey = NULL, *cek = NULL;
234 size_t enckeylen;
235 size_t ceklen;
236 CMS_EncryptedContentInfo *ec;
237 enckeylen = rek->encryptedKey->length;
238 enckey = rek->encryptedKey->data;
239 /* Setup all parameters to derive KEK */
240 if (!cms_env_asn1_ctrl(ri, 1))
241 goto err;
242 /* Attempt to decrypt CEK */
243 if (!cms_kek_cipher(&cek, &ceklen, enckey, enckeylen, ri->d.kari, 0))
244 goto err;
245 ec = cms->d.envelopedData->encryptedContentInfo;
246 OPENSSL_clear_free(ec->key, ec->keylen);
247 ec->key = cek;
248 ec->keylen = ceklen;
249 cek = NULL;
250 rv = 1;
251 err:
252 OPENSSL_free(cek);
253 return rv;
254}
255
256/* Create ephemeral key and initialise context based on it */
257static int cms_kari_create_ephemeral_key(CMS_KeyAgreeRecipientInfo *kari,
258 EVP_PKEY *pk)
259{
260 EVP_PKEY_CTX *pctx = NULL;
261 EVP_PKEY *ekey = NULL;
262 int rv = 0;
263 pctx = EVP_PKEY_CTX_new(pk, NULL);
264 if (!pctx)
265 goto err;
266 if (EVP_PKEY_keygen_init(pctx) <= 0)
267 goto err;
268 if (EVP_PKEY_keygen(pctx, &ekey) <= 0)
269 goto err;
270 EVP_PKEY_CTX_free(pctx);
271 pctx = EVP_PKEY_CTX_new(ekey, NULL);
272 if (!pctx)
273 goto err;
274 if (EVP_PKEY_derive_init(pctx) <= 0)
275 goto err;
276 kari->pctx = pctx;
277 rv = 1;
278 err:
279 if (!rv)
280 EVP_PKEY_CTX_free(pctx);
281 EVP_PKEY_free(ekey);
282 return rv;
283}
284
285/* Initialise a kari based on passed certificate and key */
286
287int cms_RecipientInfo_kari_init(CMS_RecipientInfo *ri, X509 *recip,
288 EVP_PKEY *pk, unsigned int flags)
289{
290 CMS_KeyAgreeRecipientInfo *kari;
291 CMS_RecipientEncryptedKey *rek = NULL;
292
293 ri->d.kari = M_ASN1_new_of(CMS_KeyAgreeRecipientInfo);
294 if (!ri->d.kari)
295 return 0;
296 ri->type = CMS_RECIPINFO_AGREE;
297
298 kari = ri->d.kari;
299 kari->version = 3;
300
301 rek = M_ASN1_new_of(CMS_RecipientEncryptedKey);
302 if (rek == NULL)
303 return 0;
304
305 if (!sk_CMS_RecipientEncryptedKey_push(kari->recipientEncryptedKeys, rek)) {
306 M_ASN1_free_of(rek, CMS_RecipientEncryptedKey);
307 return 0;
308 }
309
310 if (flags & CMS_USE_KEYID) {
311 rek->rid->type = CMS_REK_KEYIDENTIFIER;
312 rek->rid->d.rKeyId = M_ASN1_new_of(CMS_RecipientKeyIdentifier);
313 if (rek->rid->d.rKeyId == NULL)
314 return 0;
315 if (!cms_set1_keyid(&rek->rid->d.rKeyId->subjectKeyIdentifier, recip))
316 return 0;
317 } else {
318 rek->rid->type = CMS_REK_ISSUER_SERIAL;
319 if (!cms_set1_ias(&rek->rid->d.issuerAndSerialNumber, recip))
320 return 0;
321 }
322
323 /* Create ephemeral key */
324 if (!cms_kari_create_ephemeral_key(kari, pk))
325 return 0;
326
327 EVP_PKEY_up_ref(pk);
328 rek->pkey = pk;
329 return 1;
330}
331
332static int cms_wrap_init(CMS_KeyAgreeRecipientInfo *kari,
333 const EVP_CIPHER *cipher)
334{
335 EVP_CIPHER_CTX *ctx = kari->ctx;
336 const EVP_CIPHER *kekcipher;
337 int keylen = EVP_CIPHER_key_length(cipher);
338 /* If a suitable wrap algorithm is already set nothing to do */
339 kekcipher = EVP_CIPHER_CTX_cipher(ctx);
340
341 if (kekcipher) {
342 if (EVP_CIPHER_CTX_mode(ctx) != EVP_CIPH_WRAP_MODE)
343 return 0;
344 return 1;
345 }
346 /*
347 * Pick a cipher based on content encryption cipher. If it is DES3 use
348 * DES3 wrap otherwise use AES wrap similar to key size.
349 */
350#ifndef OPENSSL_NO_DES
351 if (EVP_CIPHER_type(cipher) == NID_des_ede3_cbc)
352 kekcipher = EVP_des_ede3_wrap();
353 else
354#endif
355 if (keylen <= 16)
356 kekcipher = EVP_aes_128_wrap();
357 else if (keylen <= 24)
358 kekcipher = EVP_aes_192_wrap();
359 else
360 kekcipher = EVP_aes_256_wrap();
361 return EVP_EncryptInit_ex(ctx, kekcipher, NULL, NULL, NULL);
362}
363
364/* Encrypt content key in key agreement recipient info */
365
366int cms_RecipientInfo_kari_encrypt(CMS_ContentInfo *cms,
367 CMS_RecipientInfo *ri)
368{
369 CMS_KeyAgreeRecipientInfo *kari;
370 CMS_EncryptedContentInfo *ec;
371 CMS_RecipientEncryptedKey *rek;
372 STACK_OF(CMS_RecipientEncryptedKey) *reks;
373 int i;
374
375 if (ri->type != CMS_RECIPINFO_AGREE) {
376 CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_ENCRYPT, CMS_R_NOT_KEY_AGREEMENT);
377 return 0;
378 }
379 kari = ri->d.kari;
380 reks = kari->recipientEncryptedKeys;
381 ec = cms->d.envelopedData->encryptedContentInfo;
382 /* Initialise wrap algorithm parameters */
383 if (!cms_wrap_init(kari, ec->cipher))
384 return 0;
385 /*
386 * If no originator key set up initialise for ephemeral key the public key
387 * ASN1 structure will set the actual public key value.
388 */
389 if (kari->originator->type == -1) {
390 CMS_OriginatorIdentifierOrKey *oik = kari->originator;
391 oik->type = CMS_OIK_PUBKEY;
392 oik->d.originatorKey = M_ASN1_new_of(CMS_OriginatorPublicKey);
393 if (!oik->d.originatorKey)
394 return 0;
395 }
396 /* Initialise KDF algorithm */
397 if (!cms_env_asn1_ctrl(ri, 0))
398 return 0;
399 /* For each rek, derive KEK, encrypt CEK */
400 for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
401 unsigned char *enckey;
402 size_t enckeylen;
403 rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
404 if (EVP_PKEY_derive_set_peer(kari->pctx, rek->pkey) <= 0)
405 return 0;
406 if (!cms_kek_cipher(&enckey, &enckeylen, ec->key, ec->keylen,
407 kari, 1))
408 return 0;
409 ASN1_STRING_set0(rek->encryptedKey, enckey, enckeylen);
410 }
411
412 return 1;
413
414}
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