| /* |
| * 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_HKDF_H_ |
| #define SYSTEM_KEYMASTER_HKDF_H_ |
| |
| #include "kdf.h" |
| |
| #include <keymaster/serializable.h> |
| |
| #include <keymaster/UniquePtr.h> |
| |
| namespace keymaster { |
| |
| /** |
| * Rfc5869Sha256Kdf implements the key derivation function specified in RFC 5869 (using SHA256) and |
| * outputs key material, as needed by ECIES. See https://tools.ietf.org/html/rfc5869 for details. |
| */ |
| class Rfc5869Sha256Kdf : public Kdf { |
| public: |
| ~Rfc5869Sha256Kdf() {} |
| bool Init(Buffer& secret, Buffer& salt) { |
| return Init(secret.peek_read(), secret.available_read(), salt.peek_read(), |
| salt.available_read()); |
| } |
| |
| bool Init(const uint8_t* secret, size_t secret_len, const uint8_t* salt, size_t salt_len) { |
| return Kdf::Init(KM_DIGEST_SHA_2_256, secret, secret_len, salt, salt_len); |
| } |
| |
| bool GenerateKey(const uint8_t* info, size_t info_len, uint8_t* output, |
| size_t output_len) override; |
| }; |
| |
| } // namespace keymaster |
| |
| #endif // SYSTEM_KEYMASTER_HKDF_H_ |