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 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, 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 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER);
73 (void)ERR_pop_to_mark();
75 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
76 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
77 CMS_R_CIPHER_INITIALISATION_ERROR);
82 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
83 /* Generate a random IV if we need one */
84 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
86 if (RAND_bytes_ex(cms_ctx->libctx, iv, ivlen) <= 0)
91 if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
92 CMSerr(0, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
95 if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
98 && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
99 ec->taglen, ec->tag) <= 0) {
100 CMSerr(0, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
105 len = EVP_CIPHER_CTX_key_length(ctx);
108 tkeylen = (size_t)len;
110 /* Generate random session key */
111 if (!enc || !ec->key) {
112 tkey = OPENSSL_malloc(tkeylen);
114 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
117 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
123 ec->keylen = tkeylen;
132 if (ec->keylen != tkeylen) {
133 /* If necessary set key length */
134 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
136 * Only reveal failure if debugging so we don't leak information
137 * which may be useful in MMA.
139 if (enc || ec->debug) {
140 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
141 CMS_R_INVALID_KEY_LENGTH);
145 OPENSSL_clear_free(ec->key, ec->keylen);
147 ec->keylen = tkeylen;
154 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
155 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
156 CMS_R_CIPHER_INITIALISATION_ERROR);
160 calg->parameter = ASN1_TYPE_new();
161 if (calg->parameter == NULL) {
162 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
165 if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
166 memcpy(aparams.iv, piv, ivlen);
167 aparams.iv_len = ivlen;
168 aparams.tag_len = EVP_CIPHER_CTX_tag_length(ctx);
169 if (aparams.tag_len <= 0)
173 if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
174 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
175 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
178 /* If parameter type not set omit parameter */
179 if (calg->parameter->type == V_ASN1_UNDEF) {
180 ASN1_TYPE_free(calg->parameter);
181 calg->parameter = NULL;
187 EVP_CIPHER_free(fetched_ciph);
188 if (!keep_key || !ok) {
189 OPENSSL_clear_free(ec->key, ec->keylen);
192 OPENSSL_clear_free(tkey, tkeylen);
199 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
200 const EVP_CIPHER *cipher,
201 const unsigned char *key, size_t keylen,
202 const CMS_CTX *cms_ctx)
206 if ((ec->key = OPENSSL_malloc(keylen)) == NULL) {
207 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT, ERR_R_MALLOC_FAILURE);
210 memcpy(ec->key, key, keylen);
214 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
218 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
219 const unsigned char *key, size_t keylen)
221 CMS_EncryptedContentInfo *ec;
223 if (!key || !keylen) {
224 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
228 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
229 if (!cms->d.encryptedData) {
230 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE);
233 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
234 cms->d.encryptedData->version = 0;
235 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
236 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA);
239 ec = cms->d.encryptedData->encryptedContentInfo;
240 return cms_EncryptedContent_init(ec, ciph, key, keylen, cms_get0_cmsctx(cms));
243 BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
245 CMS_EncryptedData *enc = cms->d.encryptedData;
246 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
248 return cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
249 cms_get0_cmsctx(cms));