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/*
**
** Copyright 2017, 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_KEYMASTER_PASSTHROUGH_OPERATION_H_
#define SYSTEM_KEYMASTER_KEYMASTER_PASSTHROUGH_OPERATION_H_
#include <hardware/keymaster1.h>
#include <hardware/keymaster2.h>
#include <keymaster/legacy_support/keymaster_passthrough_key.h>
#include <keymaster/operation.h>
namespace keymaster {
class AuthorizationSet;
class Key;
class Operation;
/**
* Template implementation for KM1 and KM2 operations
*/
template <typename KeymasterDeviceType> class KeymasterPassthroughOperation : public Operation {
public:
explicit KeymasterPassthroughOperation(keymaster_purpose_t purpose,
const KeymasterDeviceType* km_device, Key&& key)
: Operation(purpose, key.hw_enforced_move(), key.sw_enforced_move()),
key_blob_(key.key_material_move()), km_device_(km_device) {
operation_handle_ = 0;
}
virtual ~KeymasterPassthroughOperation() {}
keymaster_error_t Begin(const AuthorizationSet& input_params,
AuthorizationSet* output_params) override {
keymaster_key_param_set_t out_params = {};
keymaster_error_t rc;
rc = km_device_->begin(km_device_, purpose(), &key_blob_, &input_params, &out_params,
&operation_handle_);
if (rc == KM_ERROR_OK && output_params) output_params->Reinitialize(out_params);
keymaster_free_param_set(&out_params);
return rc;
}
keymaster_error_t Update(const AuthorizationSet& input_params, const Buffer& input,
AuthorizationSet* output_params, Buffer* output,
size_t* input_consumed) override {
keymaster_key_param_set_t out_params = {};
keymaster_blob_t in{input.peek_read(), input.available_read()};
keymaster_blob_t out = {};
keymaster_error_t rc;
rc = km_device_->update(km_device_, operation_handle_, &input_params, &in, input_consumed,
&out_params, &out);
if (rc == KM_ERROR_OK) {
if (output) output->Reinitialize(out.data, out.data_length);
if (output_params) output_params->Reinitialize(out_params);
}
keymaster_free_param_set(&out_params);
free(const_cast<uint8_t*>(out.data));
return rc;
}
keymaster_error_t Finish(const AuthorizationSet& input_params, const Buffer& input,
const Buffer& signature, AuthorizationSet* output_params,
Buffer* output) override;
keymaster_error_t Abort() { return km_device_->abort(km_device_, operation_handle_); }
private:
KeymasterKeyBlob key_blob_;
const KeymasterDeviceType* km_device_;
};
template <>
keymaster_error_t KeymasterPassthroughOperation<keymaster1_device_t>::Finish(
const AuthorizationSet& input_params, const Buffer& input, const Buffer& signature,
AuthorizationSet* output_params, Buffer* output);
template <>
keymaster_error_t KeymasterPassthroughOperation<keymaster2_device_t>::Finish(
const AuthorizationSet& input_params, const Buffer& input, const Buffer& signature,
AuthorizationSet* output_params, Buffer* output);
template <typename KeymasterDeviceType>
class KeymasterPassthroughOperationFactory : public OperationFactory {
public:
KeymasterPassthroughOperationFactory(keymaster_algorithm_t algorithm,
keymaster_purpose_t purpose,
const KeymasterDeviceType* km_device)
: key_type_(algorithm, purpose), km_device_(km_device) {}
virtual ~KeymasterPassthroughOperationFactory() {}
KeyType registry_key() const override { return key_type_; }
// Factory methods
OperationPtr CreateOperation(Key&& key, const AuthorizationSet& /*begin_params*/,
keymaster_error_t* error) override {
if (!error) return nullptr;
*error = KM_ERROR_OK;
OperationPtr op(new (std::nothrow) KeymasterPassthroughOperation<KeymasterDeviceType>(
key_type_.purpose, km_device_, std::move(key)));
if (!op) {
*error = KM_ERROR_MEMORY_ALLOCATION_FAILED;
}
return op;
}
// Informational methods. The returned arrays reference static memory and must not be
// deallocated or modified.
const keymaster_padding_t* SupportedPaddingModes(size_t* padding_count) const override {
*padding_count = 0;
return nullptr;
}
const keymaster_block_mode_t* SupportedBlockModes(size_t* block_mode_count) const override {
*block_mode_count = 0;
return nullptr;
}
const keymaster_digest_t* SupportedDigests(size_t* digest_count) const override {
*digest_count = 0;
return nullptr;
}
private:
KeyType key_type_;
const KeymasterDeviceType* km_device_;
};
} // namespace keymaster
#endif // SYSTEM_KEYMASTER_KEYMASTER_PASSTHROUGH_OPERATION_H_
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