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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ-- The MIT License (MIT) -- Copyright (c) 2016 Patrick Joseph Donnelly (batrick@batbytes.com) -- -- Permission is hereby granted, free of charge, to any person obtaining a copy of -- this software and associated documentation files (the "Software"), to deal in -- the Software without restriction, including without limitation the rights to -- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies -- of the Software, and to permit persons to whom the Software is furnished to do -- so, subject to the following conditions: -- -- The above copyright notice and this permission notice shall be included in all -- copies or substantial portions of the Software. -- -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE -- SOFTWARE. --- -- Base64 encoding and decoding. Follows RFC 4648. -- -- @author Patrick Donnelly -- @copyright The MIT License (MIT); Copyright (c) 2016 Patrick Joseph Donnelly (batrick@batbytes.com) local assert = assert local error = error local ipairs = ipairs local setmetatable = setmetatable local open = require "io".open local popen = require "io".popen local random = require "math".random local tmpname = require "os".tmpname local remove = require "os".remove local char = require "string".char local concat = require "table".concat local unittest = require "unittest" _ENV = require "stdnse".module("base64") local b64table = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' } --- -- Encodes a string to Base64. -- @param p Data to be encoded. -- @return Base64-encoded string. function enc (p) local out = {} local i = 1 local m = #p % 3 while i+2 <= #p do local a, b, c = p:byte(i, i+2) local e1 = b64table[((a>>2)&0x3f)+1]; local e2 = b64table[((((a<<4)&0x30)|((b>>4)&0xf))&0x3f)+1]; local e3 = b64table[((((b<<2)&0x3c)|((c>>6)&0x3))&0x3f)+1]; local e4 = b64table[(c&0x3f)+1]; out[#out+1] = e1..e2..e3..e4 i = i + 3 end if m == 2 then local a, b = p:byte(i, i+1) local c = 0 local e1 = b64table[((a>>2)&0x3f)+1]; local e2 = b64table[((((a<<4)&0x30)|((b>>4)&0xf))&0x3f)+1]; local e3 = b64table[((((b<<2)&0x3c)|((c>>6)&0x3))&0x3f)+1]; out[#out+1] = e1..e2..e3.."=" elseif m == 1 then local a = p:byte(i) local b = 0 local e1 = b64table[((a>>2)&0x3f)+1]; local e2 = b64table[((((a<<4)&0x30)|((b>>4)&0xf))&0x3f)+1]; out[#out+1] = e1..e2.."==" end return concat(out) end local db64table = setmetatable({}, {__index = function (t, k) error "invalid encoding: invalid character" end}) do local r = {["="] = 0} for i, v in ipairs(b64table) do r[v] = i-1 end for i = 0, 255 do db64table[i] = r[char(i)] end end --- -- Decodes Base64-encoded data. -- @param e Base64 encoded data. -- @return Decoded data. function dec (e) local out = {} local i = 1 local done = false e = e:gsub("%s+", "") local m = #e % 4 if m ~= 0 then error "invalid encoding: input is not divisible by 4" end while i+3 <= #e do if done then error "invalid encoding: trailing characters" end local a, b, c, d = e:byte(i, i+3) local x = ((db64table[a]<<2)&0xfc) | ((db64table[b]>>4)&0x03) local y = ((db64table[b]<<4)&0xf0) | ((db64table[c]>>2)&0x0f) local z = ((db64table[c]<<6)&0xc0) | ((db64table[d])&0x3f) if c == 0x3d then assert(d == 0x3d, "invalid encoding: invalid character") out[#out+1] = char(x) done = true elseif d == 0x3d then out[#out+1] = char(x, y) done = true else out[#out+1] = char(x, y, z) end i = i + 4 end return concat(out) end if not unittest.testing() then return _ENV end test_suite = unittest.TestSuite:new() local equal = unittest.equal for i, test in ipairs({ {"", ""}, {"\x01", "AQ=="}, {"\x00", "AA=="}, {"\x00\x01", "AAE="}, {"\x00\x01\x02", "AAEC"}, {"\x00\x01\x02\x03", "AAECAw=="}, {"\x00\x01\x02\x03\x04", "AAECAwQ="}, {"\x00\x01\x02\x03\x04\x05", "AAECAwQF"}, {"\x00\x01\x02\x03\x04\x05\x06", "AAECAwQFBg=="}, {"\x00\x01\x02\x03\x04\x05\x06\x07", "AAECAwQFBgc="}, }) do test_suite:add_test(equal(enc(test[1]), test[2]), ("encoding string %d"):format(i)) test_suite:add_test(equal(dec(test[2]), test[1]), ("decoding string %d"):format(i)) end for i = 1, 255 do test_suite:add_test(equal(dec(enc(char(i))), char(i)), ("en/decoding char %d"):format(i)) end -- whitespace stripping test_suite:add_test(equal(dec(" AAEC A\r\nw=="), "\x00\x01\x02\x03"), "whitespace stripping") -- extensive tests if false then local path = tmpname() local file = open(path, "w") local t = {} for a = 0, 255, random(1, 7) do for b = 0, 255, random(2, 7) do for c = 0, 255, random(2, 7) do t[#t+1] = char(a, b, c, 0xA) file:write(t[#t]) end end end assert(file:close()) local input = concat(t) local output = enc(input) local good = assert(popen("base64 < "..path, "r")):read("a"):gsub("%s", "") remove(path) assert(output == good) assert(dec(output) == input) end return _ENV