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/*
* Copyright 2014 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_SYMMETRIC_KEY_H_
#define SYSTEM_KEYMASTER_SYMMETRIC_KEY_H_
#include <keymaster/key_factory.h>
#include <keymaster/random_source.h>
#include <keymaster/soft_key_factory.h>
#include <keymaster/key.h>
namespace keymaster {
class SymmetricKey;
class SymmetricKeyFactory : public KeyFactory, public SoftKeyFactoryMixin {
public:
explicit SymmetricKeyFactory(const SoftwareKeyBlobMaker* blob_maker,
const RandomSource* random_source) :
SoftKeyFactoryMixin(blob_maker),
random_source_(*random_source) {}
keymaster_error_t GenerateKey(const AuthorizationSet& key_description,
KeymasterKeyBlob* key_blob, AuthorizationSet* hw_enforced,
AuthorizationSet* sw_enforced) const override;
keymaster_error_t ImportKey(const AuthorizationSet& key_description,
keymaster_key_format_t input_key_material_format,
const KeymasterKeyBlob& input_key_material,
KeymasterKeyBlob* output_key_blob, AuthorizationSet* hw_enforced,
AuthorizationSet* sw_enforced) const override;
virtual const keymaster_key_format_t* SupportedImportFormats(size_t* count) const override;
virtual const keymaster_key_format_t* SupportedExportFormats(size_t* count) const override {
return NoFormats(count);
};
private:
virtual bool key_size_supported(size_t key_size_bits) const = 0;
// These methods translate between key size in bits and bytes. Normally it's just 8 bits to the
// byte, but DES is different.
virtual size_t key_size_bytes(size_t key_size_bits) const { return key_size_bits / 8; }
virtual size_t key_size_bits(size_t key_size_bytes) const { return key_size_bytes * 8; }
virtual keymaster_error_t
validate_algorithm_specific_new_key_params(const AuthorizationSet& key_description) const = 0;
const keymaster_key_format_t* NoFormats(size_t* format_count) const {
*format_count = 0;
return NULL;
}
const RandomSource& random_source_;
};
class SymmetricKey : public Key {
public:
~SymmetricKey();
virtual keymaster_error_t formatted_key_material(keymaster_key_format_t, UniquePtr<uint8_t[]>*,
size_t*) const {
return KM_ERROR_UNSUPPORTED_KEY_FORMAT;
}
protected:
SymmetricKey(KeymasterKeyBlob&& key_material, AuthorizationSet&& hw_enforced,
AuthorizationSet&& sw_enforced,
const KeyFactory* key_factory);
};
} // namespace keymaster
#endif // SYSTEM_KEYMASTER_AES_KEY_H_
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