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path: root/src/lib/libcrypto/cms/cms_pwri.c
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Diffstat (limited to 'src/lib/libcrypto/cms/cms_pwri.c')
-rw-r--r--src/lib/libcrypto/cms/cms_pwri.c431
1 files changed, 0 insertions, 431 deletions
diff --git a/src/lib/libcrypto/cms/cms_pwri.c b/src/lib/libcrypto/cms/cms_pwri.c
deleted file mode 100644
index 7055ba5d3b..0000000000
--- a/src/lib/libcrypto/cms/cms_pwri.c
+++ /dev/null
@@ -1,431 +0,0 @@
1/* $OpenBSD: cms_pwri.c,v 1.10 2015/09/10 15:56:25 jsing Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5/* ====================================================================
6 * Copyright (c) 2009 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 <stdlib.h>
55
56#include <openssl/aes.h>
57#include <openssl/asn1t.h>
58#include <openssl/cms.h>
59#include <openssl/err.h>
60#include <openssl/pem.h>
61#include <openssl/x509v3.h>
62
63#include "asn1_locl.h"
64#include "cms_lcl.h"
65
66int
67CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri, unsigned char *pass,
68 ssize_t passlen)
69{
70 CMS_PasswordRecipientInfo *pwri;
71
72 if (ri->type != CMS_RECIPINFO_PASS) {
73 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI);
74 return 0;
75 }
76
77 pwri = ri->d.pwri;
78 pwri->pass = pass;
79 if (pass && passlen < 0)
80 passlen = strlen((char *)pass);
81 pwri->passlen = passlen;
82 return 1;
83}
84
85CMS_RecipientInfo *
86CMS_add0_recipient_password(CMS_ContentInfo *cms, int iter, int wrap_nid,
87 int pbe_nid, unsigned char *pass, ssize_t passlen,
88 const EVP_CIPHER *kekciph)
89{
90 CMS_RecipientInfo *ri = NULL;
91 CMS_EnvelopedData *env;
92 CMS_PasswordRecipientInfo *pwri;
93 EVP_CIPHER_CTX ctx;
94 X509_ALGOR *encalg = NULL;
95 unsigned char iv[EVP_MAX_IV_LENGTH];
96 int ivlen;
97
98 env = cms_get0_enveloped(cms);
99 if (!env)
100 return NULL;
101
102 if (wrap_nid <= 0)
103 wrap_nid = NID_id_alg_PWRI_KEK;
104
105 if (pbe_nid <= 0)
106 pbe_nid = NID_id_pbkdf2;
107
108 /* Get from enveloped data */
109 if (kekciph == NULL)
110 kekciph = env->encryptedContentInfo->cipher;
111
112 if (kekciph == NULL) {
113 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
114 return NULL;
115 }
116 if (wrap_nid != NID_id_alg_PWRI_KEK) {
117 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
118 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
119 return NULL;
120 }
121
122 /* Setup algorithm identifier for cipher */
123 encalg = X509_ALGOR_new();
124 EVP_CIPHER_CTX_init(&ctx);
125
126 if (EVP_EncryptInit_ex(&ctx, kekciph, NULL, NULL, NULL) <= 0) {
127 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
128 goto err;
129 }
130
131 ivlen = EVP_CIPHER_CTX_iv_length(&ctx);
132
133 if (ivlen > 0) {
134 arc4random_buf(iv, ivlen);
135 if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0) {
136 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
137 ERR_R_EVP_LIB);
138 goto err;
139 }
140 encalg->parameter = ASN1_TYPE_new();
141 if (!encalg->parameter) {
142 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
143 ERR_R_MALLOC_FAILURE);
144 goto err;
145 }
146 if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0) {
147 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
148 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
149 goto err;
150 }
151 }
152
153
154 encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx));
155
156 EVP_CIPHER_CTX_cleanup(&ctx);
157
158 /* Initialize recipient info */
159 ri = M_ASN1_new_of(CMS_RecipientInfo);
160 if (!ri)
161 goto merr;
162
163 ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
164 if (!ri->d.pwri)
165 goto merr;
166 ri->type = CMS_RECIPINFO_PASS;
167
168 pwri = ri->d.pwri;
169 /* Since this is overwritten, free up empty structure already there */
170 X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
171 pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
172 if (!pwri->keyEncryptionAlgorithm)
173 goto merr;
174 pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
175 pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
176 if (!pwri->keyEncryptionAlgorithm->parameter)
177 goto merr;
178
179 if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
180 &pwri->keyEncryptionAlgorithm->parameter->value.sequence))
181 goto merr;
182 pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
183
184 X509_ALGOR_free(encalg);
185 encalg = NULL;
186
187 /* Setup PBE algorithm */
188
189 pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
190
191 if (!pwri->keyDerivationAlgorithm)
192 goto err;
193
194 CMS_RecipientInfo_set0_password(ri, pass, passlen);
195 pwri->version = 0;
196
197 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
198 goto merr;
199
200 return ri;
201
202merr:
203 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
204err:
205 EVP_CIPHER_CTX_cleanup(&ctx);
206 if (ri)
207 M_ASN1_free_of(ri, CMS_RecipientInfo);
208 if (encalg)
209 X509_ALGOR_free(encalg);
210 return NULL;
211}
212
213/* This is an implementation of the key wrapping mechanism in RFC3211,
214 * at some point this should go into EVP.
215 */
216
217static int
218kek_unwrap_key(unsigned char *out, size_t *outlen, const unsigned char *in,
219 size_t inlen, EVP_CIPHER_CTX *ctx)
220{
221 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
222 unsigned char *tmp;
223 int outl, rv = 0;
224
225 if (inlen < 2 * blocklen) {
226 /* too small */
227 return 0;
228 }
229 if (inlen % blocklen) {
230 /* Invalid size */
231 return 0;
232 }
233 tmp = malloc(inlen);
234 /* setup IV by decrypting last two blocks */
235 EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
236 in + inlen - 2 * blocklen, blocklen * 2);
237 /* Do a decrypt of last decrypted block to set IV to correct value
238 * output it to start of buffer so we don't corrupt decrypted block
239 * this works because buffer is at least two block lengths long.
240 */
241 EVP_DecryptUpdate(ctx, tmp, &outl,
242 tmp + inlen - blocklen, blocklen);
243 /* Can now decrypt first n - 1 blocks */
244 EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen);
245
246 /* Reset IV to original value */
247 EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
248 /* Decrypt again */
249 EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen);
250 /* Check check bytes */
251 if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) &
252 (tmp[3] ^ tmp[6])) != 0xff) {
253 /* Check byte failure */
254 goto err;
255 }
256 if (inlen < (size_t)(tmp[0] - 4 )) {
257 /* Invalid length value */
258 goto err;
259 }
260 *outlen = (size_t)tmp[0];
261 memcpy(out, tmp + 4, *outlen);
262 rv = 1;
263
264err:
265 explicit_bzero(tmp, inlen);
266 free(tmp);
267 return rv;
268}
269
270static int
271kek_wrap_key(unsigned char *out, size_t *outlen, const unsigned char *in,
272 size_t inlen, EVP_CIPHER_CTX *ctx)
273{
274 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
275 size_t olen;
276 int dummy;
277
278 /* First decide length of output buffer: need header and round up to
279 * multiple of block length.
280 */
281 olen = (inlen + 4 + blocklen - 1)/blocklen;
282 olen *= blocklen;
283 if (olen < 2 * blocklen) {
284 /* Key too small */
285 return 0;
286 }
287 if (inlen > 0xFF) {
288 /* Key too large */
289 return 0;
290 }
291 if (out) {
292 /* Set header */
293 out[0] = (unsigned char)inlen;
294 out[1] = in[0] ^ 0xFF;
295 out[2] = in[1] ^ 0xFF;
296 out[3] = in[2] ^ 0xFF;
297 memcpy(out + 4, in, inlen);
298 /* Add random padding to end */
299 if (olen > inlen + 4)
300 arc4random_buf(out + 4 + inlen, olen - 4 - inlen);
301 /* Encrypt twice */
302 EVP_EncryptUpdate(ctx, out, &dummy, out, olen);
303 EVP_EncryptUpdate(ctx, out, &dummy, out, olen);
304 }
305
306 *outlen = olen;
307
308 return 1;
309}
310
311/* Encrypt/Decrypt content key in PWRI recipient info */
312
313int
314cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
315 int en_de)
316{
317 CMS_EncryptedContentInfo *ec;
318 CMS_PasswordRecipientInfo *pwri;
319 const unsigned char *p = NULL;
320 int plen;
321 int r = 0;
322 X509_ALGOR *algtmp, *kekalg = NULL;
323 EVP_CIPHER_CTX kekctx;
324 const EVP_CIPHER *kekcipher;
325 unsigned char *key = NULL;
326 size_t keylen;
327
328 ec = cms->d.envelopedData->encryptedContentInfo;
329
330 pwri = ri->d.pwri;
331 EVP_CIPHER_CTX_init(&kekctx);
332
333 if (!pwri->pass) {
334 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
335 goto err;
336 }
337 algtmp = pwri->keyEncryptionAlgorithm;
338
339 if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {
340 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
341 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
342 goto err;
343 }
344
345 if (algtmp->parameter->type == V_ASN1_SEQUENCE) {
346 p = algtmp->parameter->value.sequence->data;
347 plen = algtmp->parameter->value.sequence->length;
348 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
349 }
350 if (kekalg == NULL) {
351 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
352 CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
353 goto err;
354 }
355
356 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
357
358 if (!kekcipher) {
359 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
360 CMS_R_UNKNOWN_CIPHER);
361 goto err;
362 }
363
364 /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
365 if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de))
366 goto err;
367 EVP_CIPHER_CTX_set_padding(&kekctx, 0);
368 if (EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0) {
369 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
370 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
371 goto err;
372 }
373
374 algtmp = pwri->keyDerivationAlgorithm;
375
376 /* Finish password based key derivation to setup key in "ctx" */
377
378 if (EVP_PBE_CipherInit(algtmp->algorithm,
379 (char *)pwri->pass, pwri->passlen,
380 algtmp->parameter, &kekctx, en_de) < 0) {
381 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
382 goto err;
383 }
384
385 /* Finally wrap/unwrap the key */
386
387 if (en_de) {
388
389 if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx))
390 goto err;
391
392 key = malloc(keylen);
393
394 if (!key)
395 goto err;
396
397 if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx))
398 goto err;
399 pwri->encryptedKey->data = key;
400 pwri->encryptedKey->length = keylen;
401 } else {
402 key = malloc(pwri->encryptedKey->length);
403
404 if (!key) {
405 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
406 ERR_R_MALLOC_FAILURE);
407 goto err;
408 }
409 if (!kek_unwrap_key(key, &keylen,
410 pwri->encryptedKey->data,
411 pwri->encryptedKey->length, &kekctx)) {
412 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
413 CMS_R_UNWRAP_FAILURE);
414 goto err;
415 }
416
417 ec->key = key;
418 ec->keylen = keylen;
419
420 }
421
422 r = 1;
423
424err:
425 EVP_CIPHER_CTX_cleanup(&kekctx);
426 if (!r && key)
427 free(key);
428 X509_ALGOR_free(kekalg);
429
430 return r;
431}
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