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
23 struct EVP_PKEY_Delete {
operatorEVP_PKEY_Delete24 void operator()(EVP_PKEY* p) const { EVP_PKEY_free(p); }
25 };
26
27 struct BIGNUM_Delete {
operatorBIGNUM_Delete28 void operator()(BIGNUM* p) const { BN_free(p); }
29 };
30
31 /**
32 * Many OpenSSL APIs take ownership of an argument on success but don't free the argument on
33 * failure. This means we need to tell our scoped pointers when we've transferred ownership, without
34 * triggering a warning by not using the result of release().
35 */
36 template <typename T, typename Delete_T>
release_because_ownership_transferred(UniquePtr<T,Delete_T> & p)37 inline void release_because_ownership_transferred(UniquePtr<T, Delete_T>& p) {
38 T* val __attribute__((unused)) = p.release();
39 }
40
convert_bn_to_blob(BIGNUM * bn,keymaster_blob_t * blob)41 inline void convert_bn_to_blob(BIGNUM* bn, keymaster_blob_t* blob) {
42 blob->data_length = BN_num_bytes(bn);
43 blob->data = new uint8_t[blob->data_length];
44 BN_bn2bin(bn, const_cast<uint8_t*>(blob->data));
45 }
46
47 #endif // SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
48