| /* |
| * 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_KDF_H_ |
| #define SYSTEM_KEYMASTER_KDF_H_ |
| |
| #include <hardware/keymaster_defs.h> |
| #include <keymaster/android_keymaster_utils.h> |
| #include <keymaster/serializable.h> |
| |
| #include <UniquePtr.h> |
| |
| namespace keymaster { |
| |
| /** |
| * A base class for wrapping different key derivation functions. |
| */ |
| class Kdf { |
| public: |
| virtual ~Kdf() { memset_s(secret_key_.get(), 0, secret_key_len_); }; |
| Kdf(); |
| bool Init(keymaster_digest_t digest_type, const uint8_t* secret, size_t secret_len, |
| const uint8_t* salt, size_t salt_len); |
| virtual bool GenerateKey(const uint8_t* info, size_t info_len, uint8_t* output, |
| size_t output_len) = 0; |
| |
| protected: |
| bool Uint32ToBigEndianByteArray(uint32_t number, uint8_t* output); |
| UniquePtr<uint8_t[]> secret_key_; |
| size_t secret_key_len_; |
| UniquePtr<uint8_t[]> salt_; |
| size_t salt_len_; |
| bool is_initialized_; |
| keymaster_digest_t digest_type_; |
| size_t digest_size_; |
| }; |
| |
| } // namespace keymaster |
| |
| #endif // SYSTEM_KEYMASTER_KDF_H_ |