include/keymaster/km_openssl/triple_des_key.h

/*
 * Copyright 2018 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_TRIPLE_DES_KEY_H_
#define SYSTEM_KEYMASTER_TRIPLE_DES_KEY_H_

#include <openssl/des.h>

#include "symmetric_key.h"

namespace keymaster {

class TripleDesKeyFactory : public SymmetricKeyFactory {
  public:
    explicit TripleDesKeyFactory(const SoftwareKeyBlobMaker* blob_maker,
                                 const RandomSource* random_source)
        : SymmetricKeyFactory(blob_maker, random_source) {}

    keymaster_algorithm_t registry_key() const { return KM_ALGORITHM_TRIPLE_DES; }

    keymaster_error_t LoadKey(KeymasterKeyBlob&& key_material,
                              const AuthorizationSet& additional_params,
                              AuthorizationSet&& hw_enforced, AuthorizationSet&& sw_enforced,
                              UniquePtr<Key>* key) const override;

    OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override;

  private:
    bool key_size_supported(size_t key_size_bits) const override {
        return key_size_bits == 112 || key_size_bits == 168;
    }
    size_t key_size_bytes(size_t key_size_bits) const override { return key_size_bits / 7; }
    size_t key_size_bits(size_t key_size_bytes) const override { return key_size_bytes * 7; }

    keymaster_error_t validate_algorithm_specific_new_key_params(
        const AuthorizationSet& key_description) const override;
};

class TripleDesKey : public SymmetricKey {
  public:
    TripleDesKey(KeymasterKeyBlob&& key_material, AuthorizationSet&& hw_enforced,
                 AuthorizationSet&& sw_enforced, const KeyFactory* key_factory)
        : SymmetricKey(move(key_material), move(hw_enforced), move(sw_enforced), key_factory) {}
};

}  // namespace keymaster

#endif  // SYSTEM_KEYMASTER_TRIPLE_DES_KEY_H_