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 
24 namespace keymaster {
25 
26 class TripleDesKeyFactory : public SymmetricKeyFactory {
27   public:
TripleDesKeyFactory(const SoftwareKeyBlobMaker * blob_maker,const RandomSource * random_source)28     explicit TripleDesKeyFactory(const SoftwareKeyBlobMaker* blob_maker,
29                                  const RandomSource* random_source)
30         : SymmetricKeyFactory(blob_maker, random_source) {}
31 
registry_key()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:
key_size_supported(size_t key_size_bits)42     bool key_size_supported(size_t key_size_bits) const override {
43         return key_size_bits == 112 || key_size_bits == 168;
44     }
key_size_bytes(size_t key_size_bits)45     size_t key_size_bytes(size_t key_size_bits) const override { return key_size_bits / 7; }
key_size_bits(size_t key_size_bytes)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 
52 class TripleDesKey : public SymmetricKey {
53   public:
TripleDesKey(KeymasterKeyBlob && key_material,AuthorizationSet && hw_enforced,AuthorizationSet && sw_enforced,const KeyFactory * key_factory)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