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// Copyright 2018 Google Inc.
//
// 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 TINK_INTERNAL_KEYSET_WRAPPER_STORE_H_
#define TINK_INTERNAL_KEYSET_WRAPPER_STORE_H_
#include <memory>
#include <typeindex>
#include "absl/functional/any_invocable.h"
#include "tink/internal/keyset_wrapper.h"
#include "tink/internal/keyset_wrapper_impl.h"
#include "tink/primitive_wrapper.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace internal {
// Stores KeysetWrappers constructed from their PrimitiveWrapper. This is used
// by the Configuration and Registry classes.
//
// Once inserted, elements in Info, which include the PrimitiveWrapper, must not
// be replaced.
//
// Example:
// KeysetWrapperStore store;
// crypto::tink::util::Status status = store.Add<Aead, Aead>(
// absl::make_unique<AeadWrapper>(), std::move(primitive_getter));
// crypto::tink::util::StatusOr<const KeysetWrapper<Aead>*> wrapper =
// store.Get<Aead>();
class KeysetWrapperStore {
public:
KeysetWrapperStore() = default;
// Movable, but not copyable.
KeysetWrapperStore(KeysetWrapperStore&& other) = default;
KeysetWrapperStore& operator=(KeysetWrapperStore&& other) = default;
// Adds a crypto::tink::PrimitiveWrapper and `primitive_getter` function to
// KeysetWrapperStore.
template <class P, class Q>
crypto::tink::util::Status Add(
std::unique_ptr<PrimitiveWrapper<P, Q>> wrapper,
absl::AnyInvocable<crypto::tink::util::StatusOr<std::unique_ptr<P>>(
const google::crypto::tink::KeyData& key_data) const>
primitive_getter);
// Gets the PrimitiveWrapper that produces primitive P. This is a legacy
// function.
template <class P>
crypto::tink::util::StatusOr<const PrimitiveWrapper<P, P>*>
GetPrimitiveWrapper() const;
// Gets the KeysetWrapper that produces primitive Q.
template <class Q>
crypto::tink::util::StatusOr<const KeysetWrapper<Q>*> Get() const;
bool IsEmpty() const { return primitive_to_info_.empty(); }
private:
class Info {
public:
template <typename P, typename Q>
explicit Info(
std::unique_ptr<PrimitiveWrapper<P, Q>> wrapper,
absl::AnyInvocable<crypto::tink::util::StatusOr<std::unique_ptr<P>>(
const google::crypto::tink::KeyData& key_data) const>
primitive_getter)
: is_same_primitive_wrapping_(std::is_same<P, Q>::value),
wrapper_type_index_(std::type_index(typeid(*wrapper))),
q_type_index_(std::type_index(typeid(Q))) {
keyset_wrapper_ = absl::make_unique<KeysetWrapperImpl<P, Q>>(
wrapper.get(), std::move(primitive_getter));
original_wrapper_ = std::move(wrapper);
}
template <typename Q>
crypto::tink::util::StatusOr<const KeysetWrapper<Q>*> Get() const {
if (q_type_index_ != std::type_index(typeid(Q))) {
return crypto::tink::util::Status(
absl::StatusCode::kInternal,
"RegistryImpl::KeysetWrapper() called with wrong type");
}
return static_cast<KeysetWrapper<Q>*>(keyset_wrapper_.get());
}
// TODO(b/171021679): Deprecate this and upstream functions.
template <typename P>
crypto::tink::util::StatusOr<const PrimitiveWrapper<P, P>*>
GetPrimitiveWrapper() const {
if (!is_same_primitive_wrapping_) {
// This happens if a user uses a legacy method (like Registry::Wrap)
// directly or has a custom key manager for a primitive which has a
// PrimitiveWrapper<P,Q> with P != Q.
return crypto::tink::util::Status(
absl::StatusCode::kFailedPrecondition,
absl::StrCat("Cannot use primitive type ", typeid(P).name(),
" with a custom key manager."));
}
if (q_type_index_ != std::type_index(typeid(P))) {
return crypto::tink::util::Status(
absl::StatusCode::kInternal,
"RegistryImpl::LegacyWrapper() called with wrong type");
}
return static_cast<const PrimitiveWrapper<P, P>*>(
original_wrapper_.get());
}
// Returns true if the PrimitiveWrapper is the same class as the one used
// to construct this Info.
template <typename P, typename Q>
bool HasSameType(const PrimitiveWrapper<P, Q>& wrapper) {
return wrapper_type_index_ == std::type_index(typeid(wrapper));
}
private:
bool is_same_primitive_wrapping_;
// dynamic std::type_index of the actual PrimitiveWrapper<P,Q> class for
// which this key was inserted.
std::type_index wrapper_type_index_;
// dynamic std::type_index of Q, when PrimitiveWrapper<P,Q> was inserted.
std::type_index q_type_index_;
// The primitive_wrapper passed in. We use a shared_ptr because
// unique_ptr<void> is invalid.
std::shared_ptr<void> original_wrapper_;
// The keyset_wrapper_. We use a shared_ptr because unique_ptr<void> is
// invalid.
std::shared_ptr<void> keyset_wrapper_;
};
// Map from primitive type_index to Info.
absl::flat_hash_map<std::type_index, Info> primitive_to_info_;
};
template <class P, class Q>
crypto::tink::util::Status KeysetWrapperStore::Add(
std::unique_ptr<PrimitiveWrapper<P, Q>> wrapper,
absl::AnyInvocable<crypto::tink::util::StatusOr<std::unique_ptr<P>>(
const google::crypto::tink::KeyData& key_data) const>
primitive_getter) {
if (wrapper == nullptr) {
return crypto::tink::util::Status(absl::StatusCode::kInvalidArgument,
"Parameter 'wrapper' must be non-null.");
}
auto it = primitive_to_info_.find(std::type_index(typeid(Q)));
if (it != primitive_to_info_.end()) {
if (!it->second.HasSameType(*wrapper)) {
return util::Status(absl::StatusCode::kAlreadyExists,
"A wrapper named for this primitive already exists.");
}
return crypto::tink::util::OkStatus();
}
primitive_to_info_.insert(
{std::type_index(typeid(Q)),
Info(std::move(wrapper), std::move(primitive_getter))});
return crypto::tink::util::OkStatus();
}
template <class P>
crypto::tink::util::StatusOr<const PrimitiveWrapper<P, P>*>
KeysetWrapperStore::GetPrimitiveWrapper() const {
auto it = primitive_to_info_.find(std::type_index(typeid(P)));
if (it == primitive_to_info_.end()) {
return util::Status(
absl::StatusCode::kNotFound,
absl::StrCat("No wrapper registered for type ", typeid(P).name()));
}
return it->second.GetPrimitiveWrapper<P>();
}
template <class P>
crypto::tink::util::StatusOr<const KeysetWrapper<P>*> KeysetWrapperStore::Get()
const {
auto it = primitive_to_info_.find(std::type_index(typeid(P)));
if (it == primitive_to_info_.end()) {
return util::Status(
absl::StatusCode::kNotFound,
absl::StrCat("No wrapper registered for type ", typeid(P).name()));
}
return it->second.Get<P>();
}
} // namespace internal
} // namespace tink
} // namespace crypto
#endif // TINK_INTERNAL_KEYSET_WRAPPER_STORE_H_
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