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 * ====================================================================
54 #include "internal/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>
63 /* CMS EncryptedData Utilities */
65 /* Return BIO based on EncryptedContentInfo and key */
67 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
71 const EVP_CIPHER *ciph;
72 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
73 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
74 unsigned char *tkey = NULL;
79 int enc, keep_key = 0;
81 enc = ec->cipher ? 1 : 0;
83 b = BIO_new(BIO_f_cipher());
85 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
89 BIO_get_cipher_ctx(b, &ctx);
94 * If not keeping key set cipher to NULL so subsequent calls decrypt.
99 ciph = EVP_get_cipherbyobj(calg->algorithm);
102 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER);
107 if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) {
108 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
109 CMS_R_CIPHER_INITIALISATION_ERROR);
115 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
116 /* Generate a random IV if we need one */
117 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
119 if (RAND_bytes(iv, ivlen) <= 0)
123 } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) {
124 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
125 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
128 tkeylen = EVP_CIPHER_CTX_key_length(ctx);
129 /* Generate random session key */
130 if (!enc || !ec->key) {
131 tkey = OPENSSL_malloc(tkeylen);
133 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
136 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
142 ec->keylen = tkeylen;
151 if (ec->keylen != tkeylen) {
152 /* If necessary set key length */
153 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
155 * Only reveal failure if debugging so we don't leak information
156 * which may be useful in MMA.
158 if (enc || ec->debug) {
159 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
160 CMS_R_INVALID_KEY_LENGTH);
164 OPENSSL_clear_free(ec->key, ec->keylen);
166 ec->keylen = tkeylen;
173 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
174 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
175 CMS_R_CIPHER_INITIALISATION_ERROR);
180 calg->parameter = ASN1_TYPE_new();
181 if (calg->parameter == NULL) {
182 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
185 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) {
186 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
187 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
194 if (!keep_key || !ok) {
195 OPENSSL_clear_free(ec->key, ec->keylen);
198 OPENSSL_clear_free(tkey, tkeylen);
205 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
206 const EVP_CIPHER *cipher,
207 const unsigned char *key, size_t keylen)
211 ec->key = OPENSSL_malloc(keylen);
214 memcpy(ec->key, key, keylen);
218 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
222 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
223 const unsigned char *key, size_t keylen)
225 CMS_EncryptedContentInfo *ec;
226 if (!key || !keylen) {
227 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
231 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
232 if (!cms->d.encryptedData) {
233 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE);
236 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
237 cms->d.encryptedData->version = 0;
238 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
239 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA);
242 ec = cms->d.encryptedData->encryptedContentInfo;
243 return cms_EncryptedContent_init(ec, ciph, key, keylen);
246 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
248 CMS_EncryptedData *enc = cms->d.encryptedData;
249 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
251 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);