2 * Copyright 2008-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "internal/cryptlib.h"
11 #include <openssl/asn1t.h>
12 #include <openssl/pem.h>
13 #include <openssl/x509v3.h>
14 #include <openssl/err.h>
15 #include <openssl/cms.h>
16 #include <openssl/rand.h>
17 #include "cms_local.h"
19 /* CMS EncryptedData Utilities */
21 /* Return BIO based on EncryptedContentInfo and key */
23 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec,
24 const CMS_CTX *cms_ctx)
28 EVP_CIPHER *fetched_ciph = NULL;
29 const EVP_CIPHER *cipher = NULL;
30 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
31 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
32 unsigned char *tkey = NULL;
36 int enc, keep_key = 0;
38 enc = ec->cipher ? 1 : 0;
40 b = BIO_new(BIO_f_cipher());
42 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
46 BIO_get_cipher_ctx(b, &ctx);
52 * If not keeping key set cipher to NULL so subsequent calls decrypt.
57 cipher = EVP_get_cipherbyobj(calg->algorithm);
60 fetched_ciph = EVP_CIPHER_fetch(cms_ctx->libctx, EVP_CIPHER_name(cipher),
62 if (fetched_ciph != NULL)
63 cipher = fetched_ciph;
66 (void)ERR_clear_last_mark();
67 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER);
70 (void)ERR_pop_to_mark();
72 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
73 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
74 CMS_R_CIPHER_INITIALISATION_ERROR);
80 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
81 /* Generate a random IV if we need one */
82 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
84 if (RAND_bytes_ex(cms_ctx->libctx, iv, ivlen) <= 0)
88 } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) {
89 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
90 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
93 len = EVP_CIPHER_CTX_key_length(ctx);
96 tkeylen = (size_t)len;
98 /* Generate random session key */
99 if (!enc || !ec->key) {
100 tkey = OPENSSL_malloc(tkeylen);
102 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
105 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
111 ec->keylen = tkeylen;
120 if (ec->keylen != tkeylen) {
121 /* If necessary set key length */
122 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
124 * Only reveal failure if debugging so we don't leak information
125 * which may be useful in MMA.
127 if (enc || ec->debug) {
128 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
129 CMS_R_INVALID_KEY_LENGTH);
133 OPENSSL_clear_free(ec->key, ec->keylen);
135 ec->keylen = tkeylen;
142 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
143 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
144 CMS_R_CIPHER_INITIALISATION_ERROR);
148 calg->parameter = ASN1_TYPE_new();
149 if (calg->parameter == NULL) {
150 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
153 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) {
154 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
155 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
158 /* If parameter type not set omit parameter */
159 if (calg->parameter->type == V_ASN1_UNDEF) {
160 ASN1_TYPE_free(calg->parameter);
161 calg->parameter = NULL;
167 EVP_CIPHER_free(fetched_ciph);
168 if (!keep_key || !ok) {
169 OPENSSL_clear_free(ec->key, ec->keylen);
172 OPENSSL_clear_free(tkey, tkeylen);
179 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
180 const EVP_CIPHER *cipher,
181 const unsigned char *key, size_t keylen,
182 const CMS_CTX *cms_ctx)
186 if ((ec->key = OPENSSL_malloc(keylen)) == NULL) {
187 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT, ERR_R_MALLOC_FAILURE);
190 memcpy(ec->key, key, keylen);
194 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
198 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
199 const unsigned char *key, size_t keylen)
201 CMS_EncryptedContentInfo *ec;
203 if (!key || !keylen) {
204 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
208 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
209 if (!cms->d.encryptedData) {
210 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE);
213 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
214 cms->d.encryptedData->version = 0;
215 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
216 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA);
219 ec = cms->d.encryptedData->encryptedContentInfo;
220 return cms_EncryptedContent_init(ec, ciph, key, keylen, cms_get0_cmsctx(cms));
223 BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
225 CMS_EncryptedData *enc = cms->d.encryptedData;
226 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
228 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
229 cms_get0_cmsctx(cms));