580083b45f870aebd3e21680cfe70d6d15260dfd
[dragonfly.git] / crypto / openssl / crypto / cms / cms_enc.c
1 /* crypto/cms/cms_enc.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 "cms_lcl.h"
62
63 /* CMS EncryptedData Utilities */
64
65 DECLARE_ASN1_ITEM(CMS_EncryptedData)
66
67 /* Return BIO based on EncryptedContentInfo and key */
68
69 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
70         {
71         BIO *b;
72         EVP_CIPHER_CTX *ctx;
73         const EVP_CIPHER *ciph;
74         X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
75         unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
76         unsigned char *tkey = NULL;
77         size_t tkeylen;
78
79         int ok = 0;
80
81         int enc, keep_key = 0;
82
83         enc = ec->cipher ? 1 : 0;
84
85         b = BIO_new(BIO_f_cipher());
86         if (!b)
87                 {
88                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
89                                                         ERR_R_MALLOC_FAILURE);
90                 return NULL;
91                 }
92
93         BIO_get_cipher_ctx(b, &ctx);
94
95         if (enc)
96                 {
97                 ciph = ec->cipher;
98                 /* If not keeping key set cipher to NULL so subsequent calls
99                  * decrypt.
100                  */
101                 if (ec->key)
102                         ec->cipher = NULL;
103                 }
104         else
105                 {
106                 ciph = EVP_get_cipherbyobj(calg->algorithm);
107
108                 if (!ciph)
109                         {
110                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
111                                                         CMS_R_UNKNOWN_CIPHER);
112                         goto err;
113                         }
114                 }
115
116         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
117                 {
118                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
119                                 CMS_R_CIPHER_INITIALISATION_ERROR);
120                 goto err;
121                 }
122
123         if (enc)
124                 {
125                 int ivlen;
126                 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
127                 /* Generate a random IV if we need one */
128                 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
129                 if (ivlen > 0)
130                         {
131                         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
132                                 goto err;
133                         piv = iv;
134                         }
135                 }
136         else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
137                 {
138                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
139                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
140                 goto err;
141                 }
142         /* Generate random session key */
143         if (!enc || !ec->key)
144                 {
145                 tkeylen = EVP_CIPHER_CTX_key_length(ctx);
146                 tkey = OPENSSL_malloc(tkeylen);
147                 if (!tkey)
148                         {
149                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
150                                                         ERR_R_MALLOC_FAILURE);
151                         goto err;
152                         }
153                 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
154                         goto err;
155                 }
156
157         if (!ec->key)
158                 {
159                 ec->key = tkey;
160                 ec->keylen = tkeylen;
161                 tkey = NULL;
162                 if (enc)
163                         keep_key = 1;
164                 else
165                         ERR_clear_error();
166                 
167                 }
168
169         if (ec->keylen != tkeylen)
170                 {
171                 /* If necessary set key length */
172                 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
173                         {
174                         /* Only reveal failure if debugging so we don't
175                          * leak information which may be useful in MMA.
176                          */
177                         if (ec->debug)
178                                 {
179                                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
180                                                 CMS_R_INVALID_KEY_LENGTH);
181                                 goto err;
182                                 }
183                         else
184                                 {
185                                 /* Use random key */
186                                 OPENSSL_cleanse(ec->key, ec->keylen);
187                                 OPENSSL_free(ec->key);
188                                 ec->key = tkey;
189                                 ec->keylen = tkeylen;
190                                 tkey = NULL;
191                                 ERR_clear_error();
192                                 }
193                         }
194                 }
195
196         if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
197                 {
198                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
199                                 CMS_R_CIPHER_INITIALISATION_ERROR);
200                 goto err;
201                 }
202
203         if (piv)
204                 {
205                 calg->parameter = ASN1_TYPE_new();
206                 if (!calg->parameter)
207                         {
208                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
209                                                         ERR_R_MALLOC_FAILURE);
210                         goto err;
211                         }
212                 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
213                         {
214                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
215                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
216                         goto err;
217                         }
218                 }
219         ok = 1;
220
221         err:
222         if (ec->key && !keep_key)
223                 {
224                 OPENSSL_cleanse(ec->key, ec->keylen);
225                 OPENSSL_free(ec->key);
226                 ec->key = NULL;
227                 }
228         if (tkey)
229                 {
230                 OPENSSL_cleanse(tkey, tkeylen);
231                 OPENSSL_free(tkey);
232                 }
233         if (ok)
234                 return b;
235         BIO_free(b);
236         return NULL;
237         }
238
239 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, 
240                                 const EVP_CIPHER *cipher,
241                                 const unsigned char *key, size_t keylen)
242         {
243         ec->cipher = cipher;
244         if (key)
245                 {
246                 ec->key = OPENSSL_malloc(keylen);
247                 if (!ec->key)
248                         return 0;
249                 memcpy(ec->key, key, keylen);
250                 }
251         ec->keylen = keylen;
252         if (cipher)
253                 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
254         return 1;
255         }
256
257 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
258                                 const unsigned char *key, size_t keylen)
259         {
260         CMS_EncryptedContentInfo *ec;
261         if (!key || !keylen)
262                 {
263                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
264                 return 0;
265                 }
266         if (ciph)
267                 {
268                 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
269                 if (!cms->d.encryptedData)
270                         {
271                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
272                                 ERR_R_MALLOC_FAILURE);
273                         return 0;
274                         }
275                 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
276                 cms->d.encryptedData->version = 0;
277                 }
278         else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
279                 {
280                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
281                                                 CMS_R_NOT_ENCRYPTED_DATA);
282                 return 0;
283                 }
284         ec = cms->d.encryptedData->encryptedContentInfo;
285         return cms_EncryptedContent_init(ec, ciph, key, keylen);
286         }
287
288 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
289         {
290         CMS_EncryptedData *enc = cms->d.encryptedData;
291         if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
292                 enc->version = 2;
293         return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
294         }