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/*
* Copyright 2015 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 SOFT_GATEKEEPER_DEVICE_H_
#define SOFT_GATEKEEPER_DEVICE_H_
#include <gatekeeper/soft_gatekeeper.h>
#include <hardware/gatekeeper.h>
#include <UniquePtr.h>
namespace gatekeeper {
/**
* Software based GateKeeper implementation
*
* IMPORTANT MAINTAINER NOTE: Pointers to instances of this class must be castable to hw_device_t
* and gatekeeper. This means it must remain a standard layout class (no virtual functions and
* no data members which aren't standard layout), and device_ must be the first data member.
* Assertions in the constructor validate compliance with those constraints.
*/
class SoftGateKeeperDevice {
public:
SoftGateKeeperDevice(const hw_module_t *module);
hw_device_t *hw_device();
private:
static int close_device(hw_device_t* dev);
// Wrappers to translate the gatekeeper HAL API to the Kegyuard Messages API.
/**
* Enrolls password_payload, which should be derived from a user selected pin or password,
* with the authentication factor private key used only for enrolling authentication
* factor data.
*
* Returns: 0 on success or an error code less than 0 on error.
* On error, enrolled_password_handle will not be allocated.
*/
static int Enroll(const struct gatekeeper_device *dev, uint32_t uid,
const uint8_t *current_password_handle, size_t current_password_handle_length,
const uint8_t *current_password, size_t current_password_length,
const uint8_t *desired_password, size_t desired_password_length,
uint8_t **enrolled_password_handle, size_t *enrolled_password_handle_length);
/**
* Verifies provided_password matches enrolled_password_handle.
*
* Implementations of this module may retain the result of this call
* to attest to the recency of authentication.
*
* On success, writes the address of a verification token to auth_token,
* usable to attest password verification to other trusted services. Clients
* may pass NULL for this value.
*
* Returns: 0 on success or an error code less than 0 on error
* On error, verification token will not be allocated
*/
static int Verify(const struct gatekeeper_device *dev, uint32_t uid,
const uint8_t *enrolled_password_handle, size_t enrolled_password_handle_length,
const uint8_t *provided_password, size_t provided_password_length,
uint8_t **auth_token, size_t *auth_token_length);
gatekeeper_device device_;
UniquePtr<GateKeeper> impl_;
};
} // namespace gatekeeper
#endif //SOFT_GATEKEEPER_DEVICE_H_
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