1/*
2 * Copyright 2018 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_TRIPLE_DES_KEY_H_
18#define SYSTEM_KEYMASTER_TRIPLE_DES_KEY_H_
19
20#include <openssl/des.h>
21
22#include "symmetric_key.h"
23
24namespace keymaster {
25
26class TripleDesKeyFactory : public SymmetricKeyFactory {
27  public:
28    explicit TripleDesKeyFactory(const SoftwareKeyBlobMaker* blob_maker,
29                                 const RandomSource* random_source)
30        : SymmetricKeyFactory(blob_maker, random_source) {}
31
32    keymaster_algorithm_t registry_key() const { return KM_ALGORITHM_TRIPLE_DES; }
33
34    keymaster_error_t LoadKey(KeymasterKeyBlob&& key_material,
35                              const AuthorizationSet& additional_params,
36                              AuthorizationSet&& hw_enforced, AuthorizationSet&& sw_enforced,
37                              UniquePtr<Key>* key) const override;
38
39    OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override;
40
41  private:
42    bool key_size_supported(size_t key_size_bits) const override {
43        return key_size_bits == 112 || key_size_bits == 168;
44    }
45    size_t key_size_bytes(size_t key_size_bits) const override { return key_size_bits / 7; }
46    size_t key_size_bits(size_t key_size_bytes) const override { return key_size_bytes * 7; }
47
48    keymaster_error_t validate_algorithm_specific_new_key_params(
49        const AuthorizationSet& key_description) const override;
50};
51
52class TripleDesKey : public SymmetricKey {
53  public:
54    TripleDesKey(KeymasterKeyBlob&& key_material, AuthorizationSet&& hw_enforced,
55                 AuthorizationSet&& sw_enforced, const KeyFactory* key_factory)
56        : SymmetricKey(move(key_material), move(hw_enforced), move(sw_enforced), key_factory) {}
57};
58
59}  // namespace keymaster
60
61#endif  // SYSTEM_KEYMASTER_TRIPLE_DES_KEY_H_
62