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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_OPERATION_H_
#define SYSTEM_KEYMASTER_OPERATION_H_
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <hardware/keymaster_defs.h>
#include <keymaster/android_keymaster_utils.h>
#include <keymaster/authorization_set.h>
#include <keymaster/logger.h>
namespace keymaster {
class AuthorizationSet;
class Key;
class Operation;
class OperationFactory {
public:
virtual ~OperationFactory() {}
// Required for registry
struct KeyType {
KeyType(keymaster_algorithm_t alg, keymaster_purpose_t purp)
: algorithm(alg), purpose(purp) {}
keymaster_algorithm_t algorithm;
keymaster_purpose_t purpose;
bool operator==(const KeyType& rhs) const {
return algorithm == rhs.algorithm && purpose == rhs.purpose;
}
};
virtual KeyType registry_key() const = 0;
// Factory methods
virtual Operation* CreateOperation(const Key& key, const AuthorizationSet& begin_params,
keymaster_error_t* error) = 0;
// Informational methods. The returned arrays reference static memory and must not be
// deallocated or modified.
virtual const keymaster_padding_t* SupportedPaddingModes(size_t* padding_count) const {
*padding_count = 0;
return NULL;
}
virtual const keymaster_block_mode_t* SupportedBlockModes(size_t* block_mode_count) const {
*block_mode_count = 0;
return NULL;
}
virtual const keymaster_digest_t* SupportedDigests(size_t* digest_count) const {
*digest_count = 0;
return NULL;
}
// Convenience methods
bool supported(keymaster_padding_t padding) const;
bool supported(keymaster_block_mode_t padding) const;
bool supported(keymaster_digest_t padding) const;
bool is_public_key_operation() const;
bool GetAndValidatePadding(const AuthorizationSet& begin_params, const Key& key,
keymaster_padding_t* padding, keymaster_error_t* error) const;
bool GetAndValidateDigest(const AuthorizationSet& begin_params, const Key& key,
keymaster_digest_t* digest, keymaster_error_t* error) const;
};
/**
* Abstract base for all cryptographic operations.
*/
class Operation {
public:
Operation(keymaster_purpose_t purpose) : purpose_(purpose) {}
virtual ~Operation() {}
keymaster_purpose_t purpose() const { return purpose_; }
void set_key_id(uint64_t key_id) { key_id_ = key_id; }
uint64_t key_id() const { return key_id_; }
void SetAuthorizations(const AuthorizationSet& auths) {
key_auths_.Reinitialize(auths.data(), auths.size());
}
const AuthorizationSet authorizations() { return key_auths_; }
virtual keymaster_error_t Begin(const AuthorizationSet& input_params,
AuthorizationSet* output_params) = 0;
virtual keymaster_error_t Update(const AuthorizationSet& input_params, const Buffer& input,
AuthorizationSet* output_params, Buffer* output,
size_t* input_consumed) = 0;
virtual keymaster_error_t Finish(const AuthorizationSet& input_params, const Buffer& input,
const Buffer& signature, AuthorizationSet* output_params,
Buffer* output) = 0;
virtual keymaster_error_t Abort() = 0;
protected:
// Helper function for implementing Finish() methods that need to call Update() to process
// input, but don't expect any output.
keymaster_error_t UpdateForFinish(const AuthorizationSet& input_params, const Buffer& input);
private:
const keymaster_purpose_t purpose_;
AuthorizationSet key_auths_;
uint64_t key_id_;
};
} // namespace keymaster
#endif // SYSTEM_KEYMASTER_OPERATION_H_
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