2 * Copyright 2008-2021 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 *ossl_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;
40 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(cms_ctx);
41 const char *propq = ossl_cms_ctx_get0_propq(cms_ctx);
43 enc = ec->cipher ? 1 : 0;
45 b = BIO_new(BIO_f_cipher());
47 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
51 BIO_get_cipher_ctx(b, &ctx);
57 * If not keeping key set cipher to NULL so subsequent calls decrypt.
62 cipher = EVP_get_cipherbyobj(calg->algorithm);
65 fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_get0_name(cipher),
67 if (fetched_ciph != NULL)
68 cipher = fetched_ciph;
71 (void)ERR_clear_last_mark();
72 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
75 (void)ERR_pop_to_mark();
77 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
78 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
83 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_get_type(ctx));
84 /* Generate a random IV if we need one */
85 ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
87 if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
92 if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
93 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
96 if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
99 && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
100 ec->taglen, ec->tag) <= 0) {
101 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
106 len = EVP_CIPHER_CTX_get_key_length(ctx);
109 tkeylen = (size_t)len;
111 /* Generate random session key */
112 if (!enc || !ec->key) {
113 tkey = OPENSSL_malloc(tkeylen);
115 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
118 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
124 ec->keylen = tkeylen;
133 if (ec->keylen != tkeylen) {
134 /* If necessary set key length */
135 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
137 * Only reveal failure if debugging so we don't leak information
138 * which may be useful in MMA.
140 if (enc || ec->debug) {
141 ERR_raise(ERR_LIB_CMS, 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 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
159 calg->parameter = ASN1_TYPE_new();
160 if (calg->parameter == NULL) {
161 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
164 if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
165 memcpy(aparams.iv, piv, ivlen);
166 aparams.iv_len = ivlen;
167 aparams.tag_len = EVP_CIPHER_CTX_get_tag_length(ctx);
168 if (aparams.tag_len <= 0)
172 if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
173 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
176 /* If parameter type not set omit parameter */
177 if (calg->parameter->type == V_ASN1_UNDEF) {
178 ASN1_TYPE_free(calg->parameter);
179 calg->parameter = NULL;
185 EVP_CIPHER_free(fetched_ciph);
186 if (!keep_key || !ok) {
187 OPENSSL_clear_free(ec->key, ec->keylen);
190 OPENSSL_clear_free(tkey, tkeylen);
197 int ossl_cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
198 const EVP_CIPHER *cipher,
199 const unsigned char *key, size_t keylen,
200 const CMS_CTX *cms_ctx)
204 if ((ec->key = OPENSSL_malloc(keylen)) == NULL) {
205 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
208 memcpy(ec->key, key, keylen);
212 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
216 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
217 const unsigned char *key, size_t keylen)
219 CMS_EncryptedContentInfo *ec;
221 if (!key || !keylen) {
222 ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
226 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
227 if (!cms->d.encryptedData) {
228 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
231 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
232 cms->d.encryptedData->version = 0;
233 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
234 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA);
237 ec = cms->d.encryptedData->encryptedContentInfo;
238 return ossl_cms_EncryptedContent_init(ec, ciph, key, keylen,
239 ossl_cms_get0_cmsctx(cms));
242 BIO *ossl_cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
244 CMS_EncryptedData *enc = cms->d.encryptedData;
245 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
247 return ossl_cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
248 ossl_cms_get0_cmsctx(cms));