1 /* crypto/cms/cms_enc.c */
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 /* ====================================================================
7 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
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29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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52 * ====================================================================
56 #include <openssl/asn1t.h>
57 #include <openssl/pem.h>
58 #include <openssl/x509v3.h>
59 #include <openssl/err.h>
60 #include <openssl/cms.h>
61 #include <openssl/rand.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;
77 unsigned char *tkey = NULL;
82 int enc, keep_key = 0;
84 enc = ec->cipher ? 1 : 0;
86 b = BIO_new(BIO_f_cipher());
88 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
92 BIO_get_cipher_ctx(b, &ctx);
97 * If not keeping key set cipher to NULL so subsequent calls decrypt.
102 ciph = EVP_get_cipherbyobj(calg->algorithm);
105 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER);
110 if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) {
111 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
112 CMS_R_CIPHER_INITIALISATION_ERROR);
118 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
119 /* Generate a random IV if we need one */
120 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
122 if (RAND_bytes(iv, ivlen) <= 0)
126 } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) {
127 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
128 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
131 tkeylen = EVP_CIPHER_CTX_key_length(ctx);
132 /* Generate random session key */
133 if (!enc || !ec->key) {
134 tkey = OPENSSL_malloc(tkeylen);
136 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
139 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
145 ec->keylen = tkeylen;
154 if (ec->keylen != tkeylen) {
155 /* If necessary set key length */
156 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
158 * Only reveal failure if debugging so we don't leak information
159 * which may be useful in MMA.
161 if (enc || ec->debug) {
162 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
163 CMS_R_INVALID_KEY_LENGTH);
167 OPENSSL_cleanse(ec->key, ec->keylen);
168 OPENSSL_free(ec->key);
170 ec->keylen = tkeylen;
177 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
178 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
179 CMS_R_CIPHER_INITIALISATION_ERROR);
184 calg->parameter = ASN1_TYPE_new();
185 if (!calg->parameter) {
186 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
189 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) {
190 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
191 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
198 if (ec->key && !keep_key) {
199 OPENSSL_cleanse(ec->key, ec->keylen);
200 OPENSSL_free(ec->key);
204 OPENSSL_cleanse(tkey, tkeylen);
213 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
214 const EVP_CIPHER *cipher,
215 const unsigned char *key, size_t keylen)
219 ec->key = OPENSSL_malloc(keylen);
222 memcpy(ec->key, key, keylen);
226 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
230 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
231 const unsigned char *key, size_t keylen)
233 CMS_EncryptedContentInfo *ec;
234 if (!key || !keylen) {
235 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
239 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
240 if (!cms->d.encryptedData) {
241 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE);
244 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
245 cms->d.encryptedData->version = 0;
246 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
247 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA);
250 ec = cms->d.encryptedData->encryptedContentInfo;
251 return cms_EncryptedContent_init(ec, ciph, key, keylen);
254 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
256 CMS_EncryptedData *enc = cms->d.encryptedData;
257 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
259 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);