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/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
#define SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/ec.h>
#include <openssl/engine.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#include <UniquePtr.h>
#include <hardware/keymaster_defs.h>
namespace keymaster {
struct KeymasterKeyBlob;
struct EVP_PKEY_Delete {
void operator()(EVP_PKEY* p) const { EVP_PKEY_free(p); }
};
struct BIGNUM_Delete {
void operator()(BIGNUM* p) const { BN_free(p); }
};
struct BN_CTX_Delete {
void operator()(BN_CTX* p) const { BN_CTX_free(p); }
};
struct PKCS8_PRIV_KEY_INFO_Delete {
void operator()(PKCS8_PRIV_KEY_INFO* p) const { PKCS8_PRIV_KEY_INFO_free(p); }
};
struct RSA_Delete {
void operator()(RSA* p) { RSA_free(p); }
};
struct EC_GROUP_Delete {
void operator()(EC_GROUP* p) { EC_GROUP_free(p); }
};
struct EC_Delete {
void operator()(EC_KEY* p) { EC_KEY_free(p); }
};
struct ENGINE_Delete {
void operator()(ENGINE* p) { ENGINE_free(p); }
};
/**
* Many OpenSSL APIs take ownership of an argument on success but don't free the argument on
* failure. This means we need to tell our scoped pointers when we've transferred ownership, without
* triggering a warning by not using the result of release().
*/
template <typename T, typename Delete_T>
inline void release_because_ownership_transferred(UniquePtr<T, Delete_T>& p) {
T* val __attribute__((unused)) = p.release();
}
keymaster_error_t convert_pkcs8_blob_to_evp(const uint8_t* key_data, size_t key_length,
keymaster_algorithm_t expected_algorithm,
UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey);
keymaster_error_t KeyMaterialToEvpKey(keymaster_key_format_t key_format,
const KeymasterKeyBlob& key_material,
keymaster_algorithm_t expected_algorithm,
UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* evp_pkey);
keymaster_error_t EvpKeyToKeyMaterial(const EVP_PKEY* evp_pkey, KeymasterKeyBlob* key_blob);
size_t ec_group_size_bits(EC_KEY* ec_key);
} // namespace keymaster
#endif // SYSTEM_KEYMASTER_OPENSSL_UTILS_H_
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