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)
27 const EVP_CIPHER *ciph;
28 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
29 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
30 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);
51 * If not keeping key set cipher to NULL so subsequent calls decrypt.
56 ciph = EVP_get_cipherbyobj(calg->algorithm);
59 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER);
64 if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) {
65 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
66 CMS_R_CIPHER_INITIALISATION_ERROR);
72 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
73 /* Generate a random IV if we need one */
74 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
76 if (RAND_bytes(iv, ivlen) <= 0)
80 } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) {
81 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
82 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
85 len = EVP_CIPHER_CTX_key_length(ctx);
88 tkeylen = (size_t)len;
90 /* Generate random session key */
91 if (!enc || !ec->key) {
92 tkey = OPENSSL_malloc(tkeylen);
94 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
97 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
103 ec->keylen = tkeylen;
112 if (ec->keylen != tkeylen) {
113 /* If necessary set key length */
114 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
116 * Only reveal failure if debugging so we don't leak information
117 * which may be useful in MMA.
119 if (enc || ec->debug) {
120 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
121 CMS_R_INVALID_KEY_LENGTH);
125 OPENSSL_clear_free(ec->key, ec->keylen);
127 ec->keylen = tkeylen;
134 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
135 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
136 CMS_R_CIPHER_INITIALISATION_ERROR);
140 calg->parameter = ASN1_TYPE_new();
141 if (calg->parameter == NULL) {
142 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
145 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) {
146 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
147 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
150 /* If parameter type not set omit parameter */
151 if (calg->parameter->type == V_ASN1_UNDEF) {
152 ASN1_TYPE_free(calg->parameter);
153 calg->parameter = NULL;
159 if (!keep_key || !ok) {
160 OPENSSL_clear_free(ec->key, ec->keylen);
163 OPENSSL_clear_free(tkey, tkeylen);
170 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
171 const EVP_CIPHER *cipher,
172 const unsigned char *key, size_t keylen)
176 if ((ec->key = OPENSSL_malloc(keylen)) == NULL) {
177 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT, ERR_R_MALLOC_FAILURE);
180 memcpy(ec->key, key, keylen);
184 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
188 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
189 const unsigned char *key, size_t keylen)
191 CMS_EncryptedContentInfo *ec;
192 if (!key || !keylen) {
193 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
197 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
198 if (!cms->d.encryptedData) {
199 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE);
202 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
203 cms->d.encryptedData->version = 0;
204 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
205 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA);
208 ec = cms->d.encryptedData->encryptedContentInfo;
209 return cms_EncryptedContent_init(ec, ciph, key, keylen);
212 BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
214 CMS_EncryptedData *enc = cms->d.encryptedData;
215 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
217 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);