File

util/hex.lua @ 12594:29685403be32

mod_saslauth: Implement RFC 9266 'tls-exporter' channel binding (#1760) Brings back SCRAM-SHA-*-PLUS from its hiatus brought on by the earlier channel binding method being undefined for TLS 1.3, and the increasing deployment of TLS 1.3. See 1bfd238e05ad and #1542 Requires future version of LuaSec, once support for this key material export method is merged. See https://github.com/brunoos/luasec/pull/187
author Kim Alvefur <zash@zash.se>
date Wed, 01 Jun 2022 15:06:59 +0200
parent 12355:a0ff5c438e9d
line wrap: on
line source

local s_char = string.char;
local s_format = string.format;
local s_gsub = string.gsub;
local s_lower = string.lower;

local char_to_hex = {};
local hex_to_char = {};

do
	local char, hex;
	for i = 0,255 do
		char, hex = s_char(i), s_format("%02x", i);
		char_to_hex[char] = hex;
		hex_to_char[hex] = char;
	end
end

local function to(s)
	return (s_gsub(s, ".", char_to_hex));
end

local function from(s)
	return (s_gsub(s_lower(s), "%X*(%x%x)%X*", hex_to_char));
end

return {
	encode = to, decode = from;
	-- COMPAT w/pre-0.12:
	to = to, from = from;
};