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// Copyright 2023 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_SIGNATURE_ED25519_PARAMETERS_H_
#define TINK_SIGNATURE_ED25519_PARAMETERS_H_
#include "tink/signature/signature_parameters.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
class Ed25519Parameters : public SignatureParameters {
public:
// Description of the output prefix prepended to the signature.
enum class Variant : int {
// Prepends '0x01<big endian key id>' to signature.
kTink = 1,
// Prepends '0x00<big endian key id>' to signature.
kCrunchy = 2,
// Appends a 0-byte to input message BEFORE computing the signature, then
// prepends '0x00<big endian key id>' to signature.
kLegacy = 3,
// Does not prepend any prefix (i.e., keys must have no ID requirement).
kNoPrefix = 4,
// Added to guard from failures that may be caused by future expansions.
kDoNotUseInsteadUseDefaultWhenWritingSwitchStatements = 20,
};
// Copyable and movable.
Ed25519Parameters(const Ed25519Parameters& other) = default;
Ed25519Parameters& operator=(const Ed25519Parameters& other) = default;
Ed25519Parameters(Ed25519Parameters&& other) = default;
Ed25519Parameters& operator=(Ed25519Parameters&& other) = default;
// Creates a new Ed25519 parameters object unless `variant` is invalid.
static util::StatusOr<Ed25519Parameters> Create(Variant variant);
Variant GetVariant() const { return variant_; }
bool HasIdRequirement() const override {
return variant_ != Variant::kNoPrefix;
}
bool operator==(const Parameters& other) const override;
private:
explicit Ed25519Parameters(Variant variant) : variant_(variant) {}
Variant variant_;
};
} // namespace tink
} // namespace crypto
#endif // TINK_SIGNATURE_ED25519_PARAMETERS_H_
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