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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_UNEXPORTABLE_KEYS_UNEXPORTABLE_KEY_TASK_MANAGER_H_
#define COMPONENTS_UNEXPORTABLE_KEYS_UNEXPORTABLE_KEY_TASK_MANAGER_H_
#include <map>
#include "base/component_export.h"
#include "base/containers/span.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "components/unexportable_keys/background_long_task_scheduler.h"
#include "components/unexportable_keys/background_task_priority.h"
#include "components/unexportable_keys/ref_counted_unexportable_signing_key.h"
#include "components/unexportable_keys/service_error.h"
#include "components/unexportable_keys/unexportable_key_id.h"
#include "crypto/signature_verifier.h"
#include "crypto/unexportable_key.h"
namespace unexportable_keys {
// `UnexportableKeyTaskManager` helps efficiently schedule tasks to generate
// and use signing keys backed by specialized hardware.
//
// Basically, it provides an asynchronous interface for all slow tasks exposed
// by `crypto::UnexportableSigningKey` and `crypto::UnexportableKeyProvider`.
// These tasks may take up to several seconds to execute so they never should be
// run on the main thread.
//
// `UnexportableKeyTaskManager` reserves the right to deduplicate calls to
// `SignSlowlyAsync()` and cache recent results of this operation in order to
// reduce the number of operations scheduled on hardware.
//
// WARNING: This might break the assumption about the signature being
// non-deterministic for some algorithms (like ECDSA). Let the OWNERS know if
// you want to disable this feature for your use case.
//
// Read documentation to `BackgroundLongTaskScheduler` for details on how the
// tasks are getting scheduled.
class COMPONENT_EXPORT(UNEXPORTABLE_KEYS) UnexportableKeyTaskManager {
public:
explicit UnexportableKeyTaskManager(
crypto::UnexportableKeyProvider::Config config);
~UnexportableKeyTaskManager();
UnexportableKeyTaskManager(const UnexportableKeyTaskManager&) = delete;
UnexportableKeyTaskManager& operator=(const UnexportableKeyTaskManager&) =
delete;
// Returns a `crypto::UnexportableKeyProvider` that will be used by the
// `UnexportableKeyTaskManager`.
static std::unique_ptr<crypto::UnexportableKeyProvider>
GetUnexportableKeyProvider(crypto::UnexportableKeyProvider::Config config);
// Generates a new signing key asynchronously.
// The first supported value of `acceptable_algorithms` determines the type of
// the key.
// Invokes `callback` with either:
// - non-null unexportable signing key if it was generated successfully, or
// - `ServiceError` if no supported hardware exists, if no value in
// `acceptable_algorithms` is supported, or if there was an error creating
// the key.
void GenerateSigningKeySlowlyAsync(
base::span<const crypto::SignatureVerifier::SignatureAlgorithm>
acceptable_algorithms,
BackgroundTaskPriority priority,
base::OnceCallback<
void(ServiceErrorOr<scoped_refptr<RefCountedUnexportableSigningKey>>)>
callback);
// Creates a new signing key from a `wrapped_key` asynchronously.
// `wrapped_key` must have resulted from calling `GetWrappedKey()` on a
// previous instance of `crypto::UnexportableSigningKey`.
// Invokes `callback` with either:
// - non-null unexportable signing key if it was imported successfully, or
// - `ServiceError` if `wrapped_key` import failed.
void FromWrappedSigningKeySlowlyAsync(
base::span<const uint8_t> wrapped_key,
BackgroundTaskPriority priority,
base::OnceCallback<
void(ServiceErrorOr<scoped_refptr<RefCountedUnexportableSigningKey>>)>
callback);
// Schedules a new signing task or appends `callback` to an existing
// task with `signing_key` and `data` arguments. Might return a cached result
// if a task with the same combination of `signing_key` and `data` has been
// completed recently. In case of a failure, the task might be retried up to
// `max_retries` times.
// Invokes `callback` with a signature of `data`, or `ServiceError` if an
// error occurs during signing.
void SignSlowlyAsync(
scoped_refptr<RefCountedUnexportableSigningKey> signing_key,
base::span<const uint8_t> data,
BackgroundTaskPriority priority,
size_t max_retries,
base::OnceCallback<void(ServiceErrorOr<std::vector<uint8_t>>)> callback);
private:
// Scheduler to run long tasks in background.
BackgroundLongTaskScheduler task_scheduler_;
const crypto::UnexportableKeyProvider::Config config_;
};
} // namespace unexportable_keys
#endif // COMPONENTS_UNEXPORTABLE_KEYS_UNEXPORTABLE_KEY_TASK_MANAGER_H_
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