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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// 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 INCLUDED_SRC_BUILDTOOL_CRYPTO_HASHER_HPP
#define INCLUDED_SRC_BUILDTOOL_CRYPTO_HASHER_HPP
#include <cstddef>
#include <cstdint>
#include <limits>
#include <memory>
#include <optional>
#include <string>
#include <utility> // std::move
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/hex_string.hpp"
/// \brief Incremental hasher.
class Hasher {
public:
/// \brief Types of hash implementations supported by generator.
enum class HashType : std::uint8_t { SHA1, SHA256, SHA512 };
/// \brief The universal hash digest.
/// The type of hash and the digest length depends on the hash
/// implementation used to generated this digest.
class HashDigest {
friend Hasher;
public:
/// \brief Get pointer to raw bytes of digest.
/// Length can be obtained using \ref Length.
[[nodiscard]] auto Bytes() const& -> std::string const& {
return bytes_;
}
[[nodiscard]] auto Bytes() && -> std::string {
return std::move(bytes_);
}
/// \brief Get hexadecimal string of digest.
/// Length is twice the length of raw bytes (\ref Length).
[[nodiscard]] auto HexString() const -> std::string {
return ToHexString(bytes_);
}
/// \brief Get digest length in raw bytes.
[[nodiscard]] auto Length() const -> std::size_t {
return bytes_.size();
}
private:
std::string bytes_{};
explicit HashDigest(std::string bytes) : bytes_{std::move(bytes)} {}
};
/// \brief Interface for hash implementations
class IHashImpl {
public:
static constexpr size_t kCharsPerNumber =
std::numeric_limits<std::uint8_t>::max() /
std::numeric_limits<signed char>::max();
IHashImpl() noexcept = default;
IHashImpl(IHashImpl const&) = delete;
IHashImpl(IHashImpl&&) = default;
auto operator=(IHashImpl const&) -> IHashImpl& = delete;
auto operator=(IHashImpl&&) -> IHashImpl& = default;
virtual ~IHashImpl() = default;
/// \brief Feed data to the incremental hashing.
[[nodiscard]] virtual auto Update(std::string const& data) noexcept
-> bool = 0;
/// \brief Finalize the hashing and return hash as string of raw bytes.
[[nodiscard]] virtual auto Finalize() && noexcept
-> std::optional<std::string> = 0;
/// \brief Compute the hash of data and return it as string of raw
/// bytes.
[[nodiscard]] virtual auto Compute(std::string const& data) && noexcept
-> std::string = 0;
/// \brief Obtain length of the resulting hash string.
[[nodiscard]] virtual auto GetHashLength() const noexcept -> size_t = 0;
static auto FatalError() noexcept -> void {
Logger::Log(LogLevel::Error, "Failed to compute hash.");
std::terminate();
}
};
explicit Hasher(HashType type) : impl_{CreateHashImpl(type)} {}
/// \brief Feed data to the hasher.
auto Update(std::string const& data) noexcept -> bool {
return impl_->Update(data);
}
/// \brief Finalize hash.
[[nodiscard]] auto Finalize() && noexcept -> HashDigest {
if (auto hash = std::move(*impl_).Finalize()) {
return HashDigest{std::move(*hash)};
}
IHashImpl::FatalError();
return HashDigest{{}};
}
/// \brief Obtain length of the resulting hash string.
[[nodiscard]] auto GetHashLength() const noexcept -> size_t {
return impl_->GetHashLength();
}
private:
std::unique_ptr<IHashImpl> impl_;
[[nodiscard]] static auto CreateHashImpl(HashType type) noexcept
-> std::unique_ptr<IHashImpl>;
};
#endif // INCLUDED_SRC_BUILDTOOL_CRYPTO_HASHER_HPP
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