openssl_utils.h revision 4d306ec792b4348253aa77dff965bff5def1dccb 
1/*
2 * Copyright 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
18#define SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
19
20#include <openssl/evp.h>
21#include <openssl/bn.h>
22#include <openssl/x509.h>
23
24#include <UniquePtr.h>
25
26#include <hardware/keymaster_defs.h>
27
28namespace keymaster {
29
30struct EVP_PKEY_Delete {
31    void operator()(EVP_PKEY* p) const { EVP_PKEY_free(p); }
32};
33
34struct BIGNUM_Delete {
35    void operator()(BIGNUM* p) const { BN_free(p); }
36};
37
38struct PKCS8_PRIV_KEY_INFO_Delete {
39    void operator()(PKCS8_PRIV_KEY_INFO* p) const { PKCS8_PRIV_KEY_INFO_free(p); }
40};
41
42/**
43 * Many OpenSSL APIs take ownership of an argument on success but don't free the argument on
44 * failure. This means we need to tell our scoped pointers when we've transferred ownership, without
45 * triggering a warning by not using the result of release().
46 */
47template <typename T, typename Delete_T>
48inline void release_because_ownership_transferred(UniquePtr<T, Delete_T>& p) {
49    T* val __attribute__((unused)) = p.release();
50}
51
52void convert_bn_to_blob(BIGNUM* bn, keymaster_blob_t* blob);
53
54keymaster_error_t convert_pkcs8_blob_to_evp(const uint8_t* key_data, size_t key_length,
55                                            keymaster_algorithm_t expected_algorithm,
56                                            UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey);
57
58}  // namespace keymaster
59
60#endif  // SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
61