Remove unnecessary header.
[openssl.git] / 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
77         int ok = 0;
78
79         int enc, keep_key = 0;
80
81         enc = ec->cipher ? 1 : 0;
82
83         b = BIO_new(BIO_f_cipher());
84         if (!b)
85                 {
86                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
87                                                         ERR_R_MALLOC_FAILURE);
88                 return NULL;
89                 }
90
91         BIO_get_cipher_ctx(b, &ctx);
92
93         if (enc)
94                 {
95                 ciph = ec->cipher;
96                 /* If not keeping key set cipher to NULL so subsequent calls
97                  * decrypt.
98                  */
99                 if (ec->key)
100                         ec->cipher = NULL;
101                 }
102         else
103                 {
104                 ciph = EVP_get_cipherbyobj(calg->algorithm);
105
106                 if (!ciph)
107                         {
108                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
109                                                         CMS_R_UNKNOWN_CIPHER);
110                         goto err;
111                         }
112                 }
113
114         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
115                 {
116                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
117                                 CMS_R_CIPHER_INITIALISATION_ERROR);
118                 goto err;
119                 }
120
121         if (enc)
122                 {
123                 int ivlen;
124                 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
125                 /* Generate a random IV if we need one */
126                 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
127                 if (ivlen > 0)
128                         {
129                         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
130                                 goto err;
131                         piv = iv;
132                         }
133                 }
134         else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
135                 {
136                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
137                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
138                 goto err;
139                 }
140
141
142         if (enc && !ec->key)
143                 {
144                 /* Generate random key */
145                 if (!ec->keylen)
146                         ec->keylen = EVP_CIPHER_CTX_key_length(ctx);
147                 ec->key = OPENSSL_malloc(ec->keylen);
148                 if (!ec->key)
149                         {
150                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
151                                                         ERR_R_MALLOC_FAILURE);
152                         goto err;
153                         }
154                 if (EVP_CIPHER_CTX_rand_key(ctx, ec->key) <= 0)
155                         goto err;
156                 keep_key = 1;
157                 }
158         else if (ec->keylen != (unsigned int)EVP_CIPHER_CTX_key_length(ctx))
159                 {
160                 /* If necessary set key length */
161                 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
162                         {
163                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
164                                 CMS_R_INVALID_KEY_LENGTH);
165                         goto err;
166                         }
167                 }
168
169         if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
170                 {
171                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
172                                 CMS_R_CIPHER_INITIALISATION_ERROR);
173                 goto err;
174                 }
175
176         if (piv)
177                 {
178                 calg->parameter = ASN1_TYPE_new();
179                 if (!calg->parameter)
180                         {
181                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
182                                                         ERR_R_MALLOC_FAILURE);
183                         goto err;
184                         }
185                 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
186                         {
187                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
188                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
189                         goto err;
190                         }
191                 }
192         ok = 1;
193
194         err:
195         if (ec->key && !keep_key)
196                 {
197                 OPENSSL_cleanse(ec->key, ec->keylen);
198                 OPENSSL_free(ec->key);
199                 ec->key = NULL;
200                 }
201         if (ok)
202                 return b;
203         BIO_free(b);
204         return NULL;
205         }
206
207 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, 
208                                 const EVP_CIPHER *cipher,
209                                 const unsigned char *key, size_t keylen)
210         {
211         ec->cipher = cipher;
212         if (key)
213                 {
214                 ec->key = OPENSSL_malloc(keylen);
215                 if (!ec->key)
216                         return 0;
217                 memcpy(ec->key, key, keylen);
218                 }
219         ec->keylen = keylen;
220         if (cipher)
221                 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
222         return 1;
223         }
224
225 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
226                                 const unsigned char *key, size_t keylen)
227         {
228         CMS_EncryptedContentInfo *ec;
229         if (!key || !keylen)
230                 {
231                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
232                 return 0;
233                 }
234         if (ciph)
235                 {
236                 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
237                 if (!cms->d.encryptedData)
238                         {
239                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
240                                 ERR_R_MALLOC_FAILURE);
241                         return 0;
242                         }
243                 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
244                 cms->d.encryptedData->version = 0;
245                 }
246         else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
247                 {
248                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
249                                                 CMS_R_NOT_ENCRYPTED_DATA);
250                 return 0;
251                 }
252         ec = cms->d.encryptedData->encryptedContentInfo;
253         return cms_EncryptedContent_init(ec, ciph, key, keylen);
254         }
255
256 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
257         {
258         CMS_EncryptedData *enc = cms->d.encryptedData;
259         if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
260                 enc->version = 2;
261         return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
262         }