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// Copyright 2022 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_WEB_PACKAGE_SIGNED_WEB_BUNDLES_ED25519_SIGNATURE_H_
#define COMPONENTS_WEB_PACKAGE_SIGNED_WEB_BUNDLES_ED25519_SIGNATURE_H_
#include <array>
#include <optional>
#include "base/containers/span.h"
#include "base/gtest_prod_util.h"
#include "base/types/expected.h"
#include "components/web_package/signed_web_bundles/ed25519_public_key.h"
#include "mojo/public/cpp/bindings/default_construct_tag.h"
namespace web_package {
// Wrapper class around an Ed25519 signature.
class Ed25519Signature {
public:
static constexpr size_t kLength = 64;
// Attempt to convert the provided bytes into an Ed25519 signature, returning
// a string describing the error on failure.
static base::expected<Ed25519Signature, std::string> Create(
base::span<const uint8_t> bytes);
static Ed25519Signature Create(base::span<const uint8_t, kLength> bytes);
explicit Ed25519Signature(mojo::DefaultConstruct::Tag) {}
Ed25519Signature(const Ed25519Signature&) = default;
Ed25519Signature(Ed25519Signature&&) = default;
Ed25519Signature& operator=(const Ed25519Signature&) = default;
Ed25519Signature& operator=(Ed25519Signature&&) = default;
friend bool operator==(const Ed25519Signature&,
const Ed25519Signature&) = default;
[[nodiscard]] bool Verify(base::span<const uint8_t> message,
const Ed25519PublicKey& public_key) const;
const std::array<uint8_t, kLength>& bytes() const { return *bytes_; }
private:
FRIEND_TEST_ALL_PREFIXES(StructTraitsTest, Ed25519Signature);
Ed25519Signature() = default;
explicit Ed25519Signature(std::array<uint8_t, kLength>& bytes);
// This field is `std::nullopt` only when the default constructor is used,
// which only happens as part of mojom `StructTraits`. All methods of this
// class can safely assume that this field is never `std::nullopt` and should
// `CHECK` if it is.
std::optional<std::array<uint8_t, kLength>> bytes_;
};
} // namespace web_package
#endif // COMPONENTS_WEB_PACKAGE_SIGNED_WEB_BUNDLES_ED25519_SIGNATURE_H_
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