1 /* crypto/cms/cms_enc.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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>
63 /* CMS EncryptedData Utilities */
65 DECLARE_ASN1_ITEM(CMS_EncryptedData
)
67 /* Return BIO based on EncryptedContentInfo and key */
69 BIO
*cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo
*ec
)
73 const EVP_CIPHER
*ciph
;
74 X509_ALGOR
*calg
= ec
->contentEncryptionAlgorithm
;
75 unsigned char iv
[EVP_MAX_IV_LENGTH
], *piv
= NULL
;
79 int enc
, keep_key
= 0;
81 enc
= ec
->cipher
? 1 : 0;
83 b
= BIO_new(BIO_f_cipher());
86 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
87 ERR_R_MALLOC_FAILURE
);
91 BIO_get_cipher_ctx(b
, &ctx
);
96 /* If not keeping key set cipher to NULL so subsequent calls
104 ciph
= EVP_get_cipherbyobj(calg
->algorithm
);
108 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
109 CMS_R_UNKNOWN_CIPHER
);
114 if (EVP_CipherInit_ex(ctx
, ciph
, NULL
, NULL
, NULL
, enc
) <= 0)
116 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
117 CMS_R_CIPHER_INITIALISATION_ERROR
);
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
);
129 if (RAND_pseudo_bytes(iv
, ivlen
) <= 0)
134 else if (EVP_CIPHER_asn1_to_param(ctx
, calg
->parameter
) <= 0)
136 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
137 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR
);
144 /* Generate random key */
146 ec
->keylen
= EVP_CIPHER_CTX_key_length(ctx
);
147 ec
->key
= OPENSSL_malloc(ec
->keylen
);
150 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
151 ERR_R_MALLOC_FAILURE
);
154 if (EVP_CIPHER_CTX_rand_key(ctx
, ec
->key
) <= 0)
158 else if (ec
->keylen
!= (unsigned int)EVP_CIPHER_CTX_key_length(ctx
))
160 /* If necessary set key length */
161 if (EVP_CIPHER_CTX_set_key_length(ctx
, ec
->keylen
) <= 0)
163 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
164 CMS_R_INVALID_KEY_LENGTH
);
169 if (EVP_CipherInit_ex(ctx
, NULL
, NULL
, ec
->key
, piv
, enc
) <= 0)
171 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
172 CMS_R_CIPHER_INITIALISATION_ERROR
);
178 calg
->parameter
= ASN1_TYPE_new();
179 if (!calg
->parameter
)
181 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
182 ERR_R_MALLOC_FAILURE
);
185 if (EVP_CIPHER_param_to_asn1(ctx
, calg
->parameter
) <= 0)
187 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO
,
188 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR
);
195 if (ec
->key
&& !keep_key
)
197 OPENSSL_cleanse(ec
->key
, ec
->keylen
);
198 OPENSSL_free(ec
->key
);
207 int cms_EncryptedContent_init(CMS_EncryptedContentInfo
*ec
,
208 const EVP_CIPHER
*cipher
,
209 const unsigned char *key
, size_t keylen
)
214 ec
->key
= OPENSSL_malloc(keylen
);
217 memcpy(ec
->key
, key
, keylen
);
221 ec
->contentType
= OBJ_nid2obj(NID_pkcs7_data
);
225 int CMS_EncryptedData_set1_key(CMS_ContentInfo
*cms
, const EVP_CIPHER
*ciph
,
226 const unsigned char *key
, size_t keylen
)
228 CMS_EncryptedContentInfo
*ec
;
231 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY
, CMS_R_NO_KEY
);
236 cms
->d
.encryptedData
= M_ASN1_new_of(CMS_EncryptedData
);
237 if (!cms
->d
.encryptedData
)
239 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY
,
240 ERR_R_MALLOC_FAILURE
);
243 cms
->contentType
= OBJ_nid2obj(NID_pkcs7_encrypted
);
244 cms
->d
.encryptedData
->version
= 0;
246 else if (OBJ_obj2nid(cms
->contentType
) != NID_pkcs7_encrypted
)
248 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY
,
249 CMS_R_NOT_ENCRYPTED_DATA
);
252 ec
= cms
->d
.encryptedData
->encryptedContentInfo
;
253 return cms_EncryptedContent_init(ec
, ciph
, key
, keylen
);
256 BIO
*cms_EncryptedData_init_bio(CMS_ContentInfo
*cms
)
258 CMS_EncryptedData
*enc
= cms
->d
.encryptedData
;
259 if (enc
->encryptedContentInfo
->cipher
&& enc
->unprotectedAttrs
)
261 return cms_EncryptedContent_init_bio(enc
->encryptedContentInfo
);