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little optimization on hex2bin and bin2hex #9

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little optimization on hex2bin and bin2hex #9

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18 changes: 8 additions & 10 deletions sha2.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -4706,20 +4706,18 @@ end

local hex_to_bin, bin_to_hex, bin_to_base64, base64_to_bin
do
local function repl_hex2bin(hh)
return char(tonumber(hh, 16))
end
function hex_to_bin(hex_string)
return (gsub(hex_string, "%x%x",
function (hh)
return char(tonumber(hh, 16))
end
))
return (gsub(hex_string, "%x%x", repl_hex2bin))
end

local function repl_bin2hex(c)
return string_format("%02x", byte(c))
end
function bin_to_hex(binary_string)
return (gsub(binary_string, ".",
function (c)
return string_format("%02x", byte(c))
end
))
return (gsub(binary_string, ".", repl_bin2hex))
end

local base64_symbols = {
Expand Down