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 "crypto/asn1.h"
19 #include "cms_local.h"
21 /* CMS EncryptedData Utilities */
23 /* Return BIO based on EncryptedContentInfo and key */
25 BIO *ossl_cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec,
26 const CMS_CTX *cms_ctx)
30 EVP_CIPHER *fetched_ciph = NULL;
31 const EVP_CIPHER *cipher = NULL;
32 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
33 evp_cipher_aead_asn1_params aparams;
34 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
35 unsigned char *tkey = NULL;
40 int enc, keep_key = 0;
41 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(cms_ctx);
42 const char *propq = ossl_cms_ctx_get0_propq(cms_ctx);
44 enc = ec->cipher ? 1 : 0;
46 b = BIO_new(BIO_f_cipher());
48 ERR_raise(ERR_LIB_CMS, ERR_R_BIO_LIB);
52 BIO_get_cipher_ctx(b, &ctx);
58 * If not keeping key set cipher to NULL so subsequent calls decrypt.
63 cipher = EVP_get_cipherbyobj(calg->algorithm);
66 fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_get0_name(cipher),
68 if (fetched_ciph != NULL)
69 cipher = fetched_ciph;
72 (void)ERR_clear_last_mark();
73 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
76 (void)ERR_pop_to_mark();
78 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
79 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
84 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_get_type(ctx));
85 if (calg->algorithm == NULL || calg->algorithm->nid == NID_undef) {
86 ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_ENCRYPTION_ALGORITHM);
89 /* Generate a random IV if we need one */
90 ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
92 ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
97 if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
102 if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
103 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
106 if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
109 && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
110 ec->taglen, ec->tag) <= 0) {
111 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
116 len = EVP_CIPHER_CTX_get_key_length(ctx);
119 tkeylen = (size_t)len;
121 /* Generate random session key */
122 if (!enc || !ec->key) {
123 tkey = OPENSSL_malloc(tkeylen);
126 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
132 ec->keylen = tkeylen;
141 if (ec->keylen != tkeylen) {
142 /* If necessary set key length */
143 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
145 * Only reveal failure if debugging so we don't leak information
146 * which may be useful in MMA.
148 if (enc || ec->debug) {
149 ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
153 OPENSSL_clear_free(ec->key, ec->keylen);
155 ec->keylen = tkeylen;
162 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
163 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
167 calg->parameter = ASN1_TYPE_new();
168 if (calg->parameter == NULL) {
169 ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
172 if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
173 memcpy(aparams.iv, piv, ivlen);
174 aparams.iv_len = ivlen;
175 aparams.tag_len = EVP_CIPHER_CTX_get_tag_length(ctx);
176 if (aparams.tag_len <= 0)
180 if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
181 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
184 /* If parameter type not set omit parameter */
185 if (calg->parameter->type == V_ASN1_UNDEF) {
186 ASN1_TYPE_free(calg->parameter);
187 calg->parameter = NULL;
193 EVP_CIPHER_free(fetched_ciph);
194 if (!keep_key || !ok) {
195 OPENSSL_clear_free(ec->key, ec->keylen);
198 OPENSSL_clear_free(tkey, tkeylen);
205 int ossl_cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
206 const EVP_CIPHER *cipher,
207 const unsigned char *key, size_t keylen,
208 const CMS_CTX *cms_ctx)
212 if ((ec->key = OPENSSL_malloc(keylen)) == NULL)
214 memcpy(ec->key, key, keylen);
218 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
222 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
223 const unsigned char *key, size_t keylen)
225 CMS_EncryptedContentInfo *ec;
227 if (!key || !keylen) {
228 ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
232 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
233 if (!cms->d.encryptedData) {
234 ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
237 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
238 cms->d.encryptedData->version = 0;
239 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
240 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA);
243 ec = cms->d.encryptedData->encryptedContentInfo;
244 return ossl_cms_EncryptedContent_init(ec, ciph, key, keylen,
245 ossl_cms_get0_cmsctx(cms));
248 BIO *ossl_cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
250 CMS_EncryptedData *enc = cms->d.encryptedData;
251 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
253 return ossl_cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
254 ossl_cms_get0_cmsctx(cms));