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 "crypto/evp.h"
18 #include "cms_local.h"
20 /* CMS EncryptedData Utilities */
22 /* Return BIO based on EncryptedContentInfo and key */
24 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec,
25 const CMS_CTX *cms_ctx)
29 EVP_CIPHER *fetched_ciph = NULL;
30 const EVP_CIPHER *cipher = NULL;
31 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
32 evp_cipher_aead_asn1_params aparams;
33 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
34 unsigned char *tkey = NULL;
39 int enc, keep_key = 0;
41 enc = ec->cipher ? 1 : 0;
43 b = BIO_new(BIO_f_cipher());
45 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
49 BIO_get_cipher_ctx(b, &ctx);
55 * If not keeping key set cipher to NULL so subsequent calls decrypt.
60 cipher = EVP_get_cipherbyobj(calg->algorithm);
63 fetched_ciph = EVP_CIPHER_fetch(cms_ctx->libctx, EVP_CIPHER_name(cipher),
65 if (fetched_ciph != NULL)
66 cipher = fetched_ciph;
69 (void)ERR_clear_last_mark();
70 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
73 (void)ERR_pop_to_mark();
75 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
76 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
81 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
82 /* Generate a random IV if we need one */
83 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
85 if (RAND_bytes_ex(cms_ctx->libctx, iv, ivlen) <= 0)
90 if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
91 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
94 if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
97 && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
98 ec->taglen, ec->tag) <= 0) {
99 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
104 len = EVP_CIPHER_CTX_key_length(ctx);
107 tkeylen = (size_t)len;
109 /* Generate random session key */
110 if (!enc || !ec->key) {
111 tkey = OPENSSL_malloc(tkeylen);
113 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
116 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
122 ec->keylen = tkeylen;
131 if (ec->keylen != tkeylen) {
132 /* If necessary set key length */
133 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
135 * Only reveal failure if debugging so we don't leak information
136 * which may be useful in MMA.
138 if (enc || ec->debug) {
139 ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
143 OPENSSL_clear_free(ec->key, ec->keylen);
145 ec->keylen = tkeylen;
152 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
153 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
157 calg->parameter = ASN1_TYPE_new();
158 if (calg->parameter == NULL) {
159 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
162 if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
163 memcpy(aparams.iv, piv, ivlen);
164 aparams.iv_len = ivlen;
165 aparams.tag_len = EVP_CIPHER_CTX_tag_length(ctx);
166 if (aparams.tag_len <= 0)
170 if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
171 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
174 /* If parameter type not set omit parameter */
175 if (calg->parameter->type == V_ASN1_UNDEF) {
176 ASN1_TYPE_free(calg->parameter);
177 calg->parameter = NULL;
183 EVP_CIPHER_free(fetched_ciph);
184 if (!keep_key || !ok) {
185 OPENSSL_clear_free(ec->key, ec->keylen);
188 OPENSSL_clear_free(tkey, tkeylen);
195 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
196 const EVP_CIPHER *cipher,
197 const unsigned char *key, size_t keylen,
198 const CMS_CTX *cms_ctx)
202 if ((ec->key = OPENSSL_malloc(keylen)) == NULL) {
203 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
206 memcpy(ec->key, key, keylen);
210 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
214 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
215 const unsigned char *key, size_t keylen)
217 CMS_EncryptedContentInfo *ec;
219 if (!key || !keylen) {
220 ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
224 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
225 if (!cms->d.encryptedData) {
226 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
229 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
230 cms->d.encryptedData->version = 0;
231 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
232 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA);
235 ec = cms->d.encryptedData->encryptedContentInfo;
236 return cms_EncryptedContent_init(ec, ciph, key, keylen, cms_get0_cmsctx(cms));
239 BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
241 CMS_EncryptedData *enc = cms->d.encryptedData;
242 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
244 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
245 cms_get0_cmsctx(cms));