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>
62 #include "asn1_locl.h"
64 /* CMS EncryptedData Utilities */
66 DECLARE_ASN1_ITEM(CMS_EncryptedData)
68 /* Return BIO based on EncryptedContentInfo and key */
70 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
74 const EVP_CIPHER *ciph;
75 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
76 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
82 enc = ec->cipher ? 1 : 0;
84 b = BIO_new(BIO_f_cipher());
87 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
88 ERR_R_MALLOC_FAILURE);
92 BIO_get_cipher_ctx(b, &ctx);
98 ciph = EVP_get_cipherbyobj(calg->algorithm);
102 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
103 CMS_R_UNKNOWN_CIPHER);
108 if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
110 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
111 CMS_R_CIPHER_INITIALISATION_ERROR);
116 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
121 /* Generate a random IV if we need one */
122 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
125 if (RAND_pseudo_bytes(iv, ivlen) <= 0)
130 else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
132 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
133 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
137 /* If necessary set key length */
139 if (ec->keylen != EVP_CIPHER_CTX_key_length(ctx))
141 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
143 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
144 CMS_R_INVALID_KEY_LENGTH);
149 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
151 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
152 CMS_R_CIPHER_INITIALISATION_ERROR);
158 calg->parameter = ASN1_TYPE_new();
159 if (!calg->parameter)
161 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
162 ERR_R_MALLOC_FAILURE);
165 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
167 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
168 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
177 OPENSSL_cleanse(ec->key, ec->keylen);
178 OPENSSL_free(ec->key);
187 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
188 const EVP_CIPHER *cipher,
189 const unsigned char *key, size_t keylen)
192 ec->key = OPENSSL_malloc(keylen);
196 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
197 memcpy(ec->key, key, keylen);
202 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
203 const unsigned char *key, size_t keylen)
205 CMS_EncryptedContentInfo *ec;
208 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
209 if (!cms->d.encryptedData)
211 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
212 ERR_R_MALLOC_FAILURE);
215 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
216 cms->d.encryptedData->version = 0;
218 else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
220 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
221 CMS_R_NOT_ENCRYPTED_DATA);
224 ec = cms->d.encryptedData->encryptedContentInfo;
225 return cms_EncryptedContent_init(ec, ciph, key, keylen);
228 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
230 CMS_EncryptedData *enc = cms->d.encryptedData;
231 if (enc->unprotectedAttrs)
233 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);