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// Copyright 2024 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_ECDSA_P256_SHA256_SIGNATURE_H_
#define COMPONENTS_WEB_PACKAGE_SIGNED_WEB_BUNDLES_ECDSA_P256_SHA256_SIGNATURE_H_
#include <cstdint>
#include <optional>
#include <string>
#include <vector>
#include "base/containers/span.h"
#include "base/types/expected.h"
#include "components/web_package/signed_web_bundles/ecdsa_p256_public_key.h"
#include "mojo/public/cpp/bindings/default_construct_tag.h"
namespace web_package {
// Wrapper class around an ECDSA P-256 SHA-256 signature.
class EcdsaP256SHA256Signature {
public:
// Attempt to convert the provided bytes into an ECDSA P-256 signature,
// returning a string describing the error on failure.
static base::expected<EcdsaP256SHA256Signature, std::string> Create(
base::span<const uint8_t> bytes);
explicit EcdsaP256SHA256Signature(mojo::DefaultConstruct::Tag);
EcdsaP256SHA256Signature(const EcdsaP256SHA256Signature&);
EcdsaP256SHA256Signature(EcdsaP256SHA256Signature&&);
EcdsaP256SHA256Signature& operator=(const EcdsaP256SHA256Signature&);
EcdsaP256SHA256Signature& operator=(EcdsaP256SHA256Signature&&);
~EcdsaP256SHA256Signature();
bool operator==(const EcdsaP256SHA256Signature& other) const = default;
[[nodiscard]] bool Verify(base::span<const uint8_t> message,
const EcdsaP256PublicKey& public_key) const;
base::span<const uint8_t> bytes() const { return *bytes_; }
private:
explicit EcdsaP256SHA256Signature(std::vector<uint8_t> 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`.
std::optional<std::vector<uint8_t>> bytes_;
};
} // namespace web_package
#endif // COMPONENTS_WEB_PACKAGE_SIGNED_WEB_BUNDLES_ECDSA_P256_SHA256_SIGNATURE_H_
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