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Copy pathdigest_hex.hpp
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74 lines (55 loc) · 2.37 KB
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/*
This file is part of libhttpserver
Copyright (C) 2011-2026 Sebastiano Merlino
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see the file LICENSE in
the distribution; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
// The hex codec shared by every RFC 7616 Digest surface (TASK-115,
// architecture section: nonce/opaque material, HA1, HA2 and the
// response token are all lowercase hex). One codec, not one per
// algorithm: MD5 and SHA-256 differ only in digest size, which the
// span carries.
//
// - encode_hex: canonical lowercase output (the form the server
// emits and the RFC's examples use);
// - decode_hex: strict -- even-length, non-empty, [0-9a-fA-F] only
// (clients may send uppercase); anything else is std::nullopt so
// every caller maps it to one malformed classification instead of
// half-parsed state.
#if !defined(HTTPSERVER_COMPILATION)
#error "digest_hex.hpp is internal; only reachable when compiling libhttpserver."
#endif
#ifndef SRC_HTTPSERVER_DETAIL_DIGEST_HEX_HPP_
#define SRC_HTTPSERVER_DETAIL_DIGEST_HEX_HPP_
#include <cstddef>
#include <optional>
#include <span>
#include <string>
#include <string_view>
#include <vector>
namespace httpserver {
namespace detail {
namespace digest {
// Lowercase hex, two digits per byte.
std::string encode_hex(std::span<const std::byte> bytes);
namespace hex_detail {
int hex_digit_value(char c) noexcept;
} // namespace hex_detail
// Strict hex decode: refuses empty input, odd lengths, and any
// non-hexadecimal octet.
std::optional<std::vector<std::byte>> decode_hex(
std::string_view text);
} // namespace digest
} // namespace detail
} // namespace httpserver
#endif // SRC_HTTPSERVER_DETAIL_DIGEST_HEX_HPP_