54a1e431c2289d19ae7b5125a0375b06af5de0aa
[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 #include "asn1_locl.h"
63
64 /* CMS EncryptedData Utilities */
65
66 DECLARE_ASN1_ITEM(CMS_EncryptedData)
67
68 /* Return BIO based on EncryptedContentInfo and key */
69
70 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
71         {
72         BIO *b;
73         EVP_CIPHER_CTX *ctx;
74         const EVP_CIPHER *ciph;
75         X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
76         unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
77
78         int ok = 0;
79
80         int enc;
81
82         enc = ec->cipher ? 1 : 0;
83
84         b = BIO_new(BIO_f_cipher());
85         if (!b)
86                 {
87                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
88                                                         ERR_R_MALLOC_FAILURE);
89                 return NULL;
90                 }
91
92         BIO_get_cipher_ctx(b, &ctx);
93
94         if (enc)
95                 ciph = ec->cipher;
96         else
97                 {
98                 ciph = EVP_get_cipherbyobj(calg->algorithm);
99
100                 if (!ciph)
101                         {
102                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
103                                                         CMS_R_UNKNOWN_CIPHER);
104                         goto err;
105                         }
106                 }
107
108         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
109                 {
110                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
111                                 CMS_R_CIPHER_INITIALISATION_ERROR);
112                 goto err;
113                 }
114
115         if (enc)
116                 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
117
118         /* If necessary set key length */
119
120         if (ec->keylen != EVP_CIPHER_CTX_key_length(ctx))
121                 {
122                 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
123                         {
124                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
125                                 CMS_R_INVALID_KEY_LENGTH);
126                         goto err;
127                         }
128                 }
129
130         if (enc)
131                 {
132                 int ivlen;
133                 /* Generate a random IV if we need one */
134                 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
135                 if (ivlen > 0)
136                         {
137                         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
138                                 goto err;
139                         piv = iv;
140                         }
141                 }
142         else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
143                         {
144                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
145                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
146                         goto err;
147                         }
148
149         if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
150                 {
151                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
152                                 CMS_R_CIPHER_INITIALISATION_ERROR);
153                 goto err;
154                 }
155
156         if (piv)
157                 {
158                 calg->parameter = ASN1_TYPE_new();
159                 if (!calg->parameter)
160                         {
161                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
162                                                         ERR_R_MALLOC_FAILURE);
163                         goto err;
164                         }
165                 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
166                         {
167                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
168                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
169                         goto err;
170                         }
171                 }
172         ok = 1;
173
174         err:
175         if (ec->key)
176                 {
177                 OPENSSL_cleanse(ec->key, ec->keylen);
178                 OPENSSL_free(ec->key);
179                 ec->key = NULL;
180                 }
181         if (ok)
182                 return b;
183         BIO_free(b);
184         return NULL;
185         }
186
187 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, 
188                                 const EVP_CIPHER *cipher,
189                                 const unsigned char *key, size_t keylen)
190         {
191         ec->cipher = cipher;
192         ec->key = OPENSSL_malloc(keylen);
193         if (!ec->key)
194                 return 0;
195         if (cipher)
196                 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
197         memcpy(ec->key, key, keylen);
198         ec->keylen = keylen;
199         return 1;
200         }
201
202 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
203                                 const unsigned char *key, size_t keylen)
204         {
205         CMS_EncryptedContentInfo *ec;
206         if (ciph)
207                 {
208                 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
209                 if (!cms->d.encryptedData)
210                         {
211                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
212                                 ERR_R_MALLOC_FAILURE);
213                         return 0;
214                         }
215                 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
216                 cms->d.encryptedData->version = 0;
217                 }
218         else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
219                 {
220                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
221                                                 CMS_R_NOT_ENCRYPTED_DATA);
222                 return 0;
223                 }
224         ec = cms->d.encryptedData->encryptedContentInfo;
225         return cms_EncryptedContent_init(ec, ciph, key, keylen);
226         }
227
228 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
229         {
230         CMS_EncryptedContentInfo *ec;
231         if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
232                 {
233                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_INIT_BIO,
234                                                 CMS_R_NOT_ENCRYPTED_DATA);
235                 return NULL;
236                 }
237         ec = cms->d.encryptedData->encryptedContentInfo;
238         return cms_EncryptedContent_init_bio(ec);
239         }