| /* |
| * Copyright 2015 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_NIST_CURVE_KEY_EXCHANGE_H_ |
| #define SYSTEM_KEYMASTER_NIST_CURVE_KEY_EXCHANGE_H_ |
| |
| #include "key_exchange.h" |
| |
| #include <keymaster/authorization_set.h> |
| #include <hardware/keymaster_defs.h> |
| |
| #include <UniquePtr.h> |
| |
| #include "openssl_utils.h" |
| |
| namespace keymaster { |
| |
| /** |
| * NistCurveKeyExchange implements a KeyExchange using elliptic-curve |
| * Diffie-Hellman on NIST curves: P-224, P-256, P-384 and P-521. |
| */ |
| class NistCurveKeyExchange : public KeyExchange { |
| public: |
| ~NistCurveKeyExchange() override {} |
| |
| /** |
| * NistCurveKeyExchange takes ownership of \p private_key. |
| */ |
| NistCurveKeyExchange(EC_KEY* private_key, keymaster_error_t* error); |
| |
| /** |
| * GenerateKeyExchange generates a new public/private key pair on a NIST curve and returns |
| * a new key exchange object. |
| */ |
| static NistCurveKeyExchange* GenerateKeyExchange(keymaster_ec_curve_t curve); |
| |
| /** |
| * KeyExchange interface. |
| */ |
| bool CalculateSharedKey(const uint8_t* peer_public_value, size_t peer_public_value_len, |
| Buffer* shared_key) const override; |
| bool CalculateSharedKey(const Buffer& peer_public_value, Buffer* shared_key) const override; |
| bool public_value(Buffer* public_value) const override; |
| |
| /* Caller takes ownership of \p private_key. */ |
| EC_KEY* private_key() { return private_key_.release(); } |
| |
| private: |
| keymaster_error_t ExtractPublicKey(); |
| |
| UniquePtr<EC_KEY, EC_KEY_Delete> private_key_; |
| UniquePtr<uint8_t[]> public_key_; |
| size_t public_key_len_; |
| size_t shared_secret_len_; |
| }; |
| |
| } // namespace keymaster |
| |
| #endif // SYSTEM_KEYMASTER_NIST_CURVE_KEY_EXCHANGE_H_ |