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)
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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;
80 int enc, keep_key = 0;
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);
97 /* If not keeping key set cipher to NULL so subsequent calls
105 ciph = EVP_get_cipherbyobj(calg->algorithm);
109 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
110 CMS_R_UNKNOWN_CIPHER);
115 if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
117 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
118 CMS_R_CIPHER_INITIALISATION_ERROR);
125 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
126 /* Generate a random IV if we need one */
127 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
130 if (RAND_pseudo_bytes(iv, ivlen) <= 0)
135 else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
137 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
138 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
145 /* Generate random key */
147 ec->keylen = EVP_CIPHER_CTX_key_length(ctx);
148 ec->key = OPENSSL_malloc(ec->keylen);
151 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
152 ERR_R_MALLOC_FAILURE);
155 if (EVP_CIPHER_CTX_rand_key(ctx, ec->key) <= 0)
159 else if (ec->keylen != (unsigned int)EVP_CIPHER_CTX_key_length(ctx))
161 /* If necessary set key length */
162 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
164 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
165 CMS_R_INVALID_KEY_LENGTH);
170 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
172 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
173 CMS_R_CIPHER_INITIALISATION_ERROR);
179 calg->parameter = ASN1_TYPE_new();
180 if (!calg->parameter)
182 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
183 ERR_R_MALLOC_FAILURE);
186 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
188 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
189 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
196 if (ec->key && !keep_key)
198 OPENSSL_cleanse(ec->key, ec->keylen);
199 OPENSSL_free(ec->key);
208 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
209 const EVP_CIPHER *cipher,
210 const unsigned char *key, size_t keylen)
215 ec->key = OPENSSL_malloc(keylen);
218 memcpy(ec->key, key, keylen);
222 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
226 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
227 const unsigned char *key, size_t keylen)
229 CMS_EncryptedContentInfo *ec;
232 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
237 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
238 if (!cms->d.encryptedData)
240 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
241 ERR_R_MALLOC_FAILURE);
244 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
245 cms->d.encryptedData->version = 0;
247 else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
249 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
250 CMS_R_NOT_ENCRYPTED_DATA);
253 ec = cms->d.encryptedData->encryptedContentInfo;
254 return cms_EncryptedContent_init(ec, ciph, key, keylen);
257 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
259 CMS_EncryptedData *enc = cms->d.encryptedData;
260 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
262 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);