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// Copyright 2022 Google LLC
//
// 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_LEGACY_PROTO_KEY_H_
#define TINK_INTERNAL_LEGACY_PROTO_KEY_H_
#include <string>
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "tink/internal/proto_key_serialization.h"
#include "tink/key.h"
#include "tink/parameters.h"
#include "tink/secret_key_access_token.h"
#include "tink/util/statusor.h"
#include "proto/tink.pb.h"
namespace crypto {
namespace tink {
namespace internal {
// Parameters returned by `LegacyProtoKey::GetParameters()` that cannot be used
// to create other LegacyProtoKey instances.
class UnusableLegacyProtoParameters : public Parameters {
public:
// Copyable and movable.
UnusableLegacyProtoParameters(const UnusableLegacyProtoParameters& other) =
default;
UnusableLegacyProtoParameters& operator=(
const UnusableLegacyProtoParameters& other) = default;
UnusableLegacyProtoParameters(UnusableLegacyProtoParameters&& other) =
default;
UnusableLegacyProtoParameters& operator=(
UnusableLegacyProtoParameters&& other) = default;
explicit UnusableLegacyProtoParameters(
absl::string_view type_url,
google::crypto::tink::OutputPrefixType output_prefix_type)
: type_url_(type_url), output_prefix_type_(output_prefix_type) {}
bool HasIdRequirement() const override {
return output_prefix_type_ != google::crypto::tink::OutputPrefixType::RAW;
}
bool operator==(const Parameters& other) const override;
private:
std::string type_url_;
google::crypto::tink::OutputPrefixType output_prefix_type_;
};
// Key type for legacy proto keys.
class LegacyProtoKey : public Key {
public:
// Copyable and movable.
LegacyProtoKey(const LegacyProtoKey& other) = default;
LegacyProtoKey& operator=(const LegacyProtoKey& other) = default;
LegacyProtoKey(LegacyProtoKey&& other) = default;
LegacyProtoKey& operator=(LegacyProtoKey&& other) = default;
// Creates `LegacyProtoKey` object from `serialization`. Requires `token` if
// the key material type is either SYMMETRIC or ASYMMETRIC_PRIVATE.
static util::StatusOr<LegacyProtoKey> Create(
ProtoKeySerialization serialization,
absl::optional<SecretKeyAccessToken> token);
const Parameters& GetParameters() const override {
return unusable_proto_parameters_;
}
absl::optional<int> GetIdRequirement() const override {
return serialization_.IdRequirement();
}
bool operator==(const Key& other) const override;
// Returns `ProtoKeySerialization` pointer for this object. Requires `token`
// if the key material type is either SYMMETRIC or ASYMMETRIC_PRIVATE.
util::StatusOr<const ProtoKeySerialization*> Serialization(
absl::optional<SecretKeyAccessToken> token) const;
private:
explicit LegacyProtoKey(ProtoKeySerialization serialization)
: serialization_(serialization),
unusable_proto_parameters_(serialization.TypeUrl(),
serialization.GetOutputPrefixType()) {}
ProtoKeySerialization serialization_;
UnusableLegacyProtoParameters unusable_proto_parameters_;
};
} // namespace internal
} // namespace tink
} // namespace crypto
#endif // TINK_INTERNAL_LEGACY_PROTO_KEY_H_
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