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OpenWrt_Luci_Lua/1_1.mi_Lua/sha1.lua

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2015-06-28 06:39:56 +00:00
--
-- SHA-1 secure hash computation, and HMAC-SHA1 signature computation,
-- in pure Lua (tested on Lua 5.1)
--
-- Latest version always at: http://regex.info/blog/lua/sha1
--
-- Copyright 2009 Jeffrey Friedl
-- jfriedl@yahoo.com
-- http://regex.info/blog/
--
--
-- Version 1 [May 28, 2009]
--
--
-- Lua is a pathetic, horrid, turd of a language. Not only doesn't it have
-- bitwise integer operators like OR and AND, it doesn't even have integers
-- (and those, relatively speaking, are its good points). Yet, this
-- implements the SHA-1 digest hash in pure Lua. While coding it, I felt as
-- if I were chiseling NAND gates out of rough blocks of silicon. Those not
-- already familiar with this woeful language may, upon seeing this code,
-- throw up in their own mouth.
--
-- It's not super fast.... a 10k-byte message takes about 2 seconds on a
-- circa-2008 mid-level server, but it should be plenty adequate for short
-- messages, such as is often needed during authentication handshaking.
--
-- Algorithm: http://www.itl.nist.gov/fipspubs/fip180-1.htm
--
-- This file creates four entries in the global namespace:
--
-- local hash_as_hex = sha1(message) -- returns a hex string
-- local hash_as_data = sha1_binary(message) -- returns raw bytes
--
-- local hmac_as_hex = hmac_sha1(key, message) -- hex string
-- local hmac_as_data = hmac_sha1_binary(key, message) -- raw bytes
--
-- Pass sha1() a string, and it returns a hash as a 40-character hex string.
-- For example, the call
--
-- local hash = sha1 "http://regex.info/blog/"
--
-- puts the 40-character string
--
-- "7f103bf600de51dfe91062300c14738b32725db5"
--
-- into the variable 'hash'
--
-- Pass sha1_hmac() a key and a message, and it returns the signature as a
-- 40-byte hex string.
--
--
-- The two "_binary" versions do the same, but return the 20-byte string of raw data
-- that the 40-byte hex strings represent.
--
------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------
local string = require("string")
local table = require("table")
local math = require("math")
local base = _G
module("sha1")
--
-- Return a W32 object for the number zero
--
local function ZERO()
return {
false, false, false, false, false, false, false, false,
false, false, false, false, false, false, false, false,
false, false, false, false, false, false, false, false,
false, false, false, false, false, false, false, false,
}
end
local hex_to_bits = {
["0"] = { false, false, false, false },
["1"] = { false, false, false, true },
["2"] = { false, false, true, false },
["3"] = { false, false, true, true },
["4"] = { false, true, false, false },
["5"] = { false, true, false, true },
["6"] = { false, true, true, false },
["7"] = { false, true, true, true },
["8"] = { true, false, false, false },
["9"] = { true, false, false, true },
["A"] = { true, false, true, false },
["B"] = { true, false, true, true },
["C"] = { true, true, false, false },
["D"] = { true, true, false, true },
["E"] = { true, true, true, false },
["F"] = { true, true, true, true },
["a"] = { true, false, true, false },
["b"] = { true, false, true, true },
["c"] = { true, true, false, false },
["d"] = { true, true, false, true },
["e"] = { true, true, true, false },
["f"] = { true, true, true, true },
}
--
-- Given a string of 8 hex digits, return a W32 object representing that number
--
local function from_hex(hex)
base.assert(base.type(hex) == 'string')
base.assert(hex:match('^[0123456789abcdefABCDEF]+$'))
base.assert(#hex == 8)
local W32 = { }
for letter in hex:gmatch('.') do
local b = hex_to_bits[letter]
base.assert(b)
table.insert(W32, 1, b[1])
table.insert(W32, 1, b[2])
table.insert(W32, 1, b[3])
table.insert(W32, 1, b[4])
end
return W32
end
local function COPY(old)
local W32 = { }
for k,v in base.pairs(old) do
W32[k] = v
end
return W32
end
local function ADD(first, ...)
local a = COPY(first)
local C, b, sum
for v = 1, base.select('#', ...) do
b = base.select(v, ...)
C = 0
for i = 1, #a do
sum = (a[i] and 1 or 0)
+ (b[i] and 1 or 0)
+ C
if sum == 0 then
a[i] = false
C = 0
elseif sum == 1 then
a[i] = true
C = 0
elseif sum == 2 then
a[i] = false
C = 1
else
a[i] = true
C = 1
end
end
-- we drop any ending carry
end
return a
end
local function XOR(first, ...)
local a = COPY(first)
local b
for v = 1, base.select('#', ...) do
b = base.select(v, ...)
for i = 1, #a do
a[i] = a[i] ~= b[i]
end
end
return a
end
local function AND(a, b)
local c = ZERO()
for i = 1, #a do
-- only need to set true bits; other bits remain false
if a[i] and b[i] then
c[i] = true
end
end
return c
end
local function OR(a, b)
local c = ZERO()
for i = 1, #a do
-- only need to set true bits; other bits remain false
if a[i] or b[i] then
c[i] = true
end
end
return c
end
local function OR3(a, b, c)
local d = ZERO()
for i = 1, #a do
-- only need to set true bits; other bits remain false
if a[i] or b[i] or c[i] then
d[i] = true
end
end
return d
end
local function NOT(a)
local b = ZERO()
for i = 1, #a do
-- only need to set true bits; other bits remain false
if not a[i] then
b[i] = true
end
end
return b
end
local function ROTATE(bits, a)
local b = COPY(a)
while bits > 0 do
bits = bits - 1
table.insert(b, 1, table.remove(b))
end
return b
end
local binary_to_hex = {
["0000"] = "0",
["0001"] = "1",
["0010"] = "2",
["0011"] = "3",
["0100"] = "4",
["0101"] = "5",
["0110"] = "6",
["0111"] = "7",
["1000"] = "8",
["1001"] = "9",
["1010"] = "a",
["1011"] = "b",
["1100"] = "c",
["1101"] = "d",
["1110"] = "e",
["1111"] = "f",
}
function asHEX(a)
local hex = ""
local i = 1
while i < #a do
local binary = (a[i + 3] and '1' or '0')
..
(a[i + 2] and '1' or '0')
..
(a[i + 1] and '1' or '0')
..
(a[i + 0] and '1' or '0')
hex = binary_to_hex[binary] .. hex
i = i + 4
end
return hex
end
local x67452301 = from_hex("67452301")
local xEFCDAB89 = from_hex("EFCDAB89")
local x98BADCFE = from_hex("98BADCFE")
local x10325476 = from_hex("10325476")
local xC3D2E1F0 = from_hex("C3D2E1F0")
local x5A827999 = from_hex("5A827999")
local x6ED9EBA1 = from_hex("6ED9EBA1")
local x8F1BBCDC = from_hex("8F1BBCDC")
local xCA62C1D6 = from_hex("CA62C1D6")
function sha1(msg)
base.assert(base.type(msg) == 'string')
base.assert(#msg < 0x7FFFFFFF) -- have no idea what would happen if it were large
local H0 = x67452301
local H1 = xEFCDAB89
local H2 = x98BADCFE
local H3 = x10325476
local H4 = xC3D2E1F0
local msg_len_in_bits = #msg * 8
local first_append = string.char(0x80) -- append a '1' bit plus seven '0' bits
local non_zero_message_bytes = #msg +1 +8 -- the +1 is the appended bit 1, the +8 are for the final appended length
local current_mod = non_zero_message_bytes % 64
local second_append = ""
if current_mod ~= 0 then
second_append = string.rep(string.char(0), 64 - current_mod)
end
-- now to append the length as a 64-bit number.
local B1, R1 = math.modf(msg_len_in_bits / 0x01000000)
local B2, R2 = math.modf( 0x01000000 * R1 / 0x00010000)
local B3, R3 = math.modf( 0x00010000 * R2 / 0x00000100)
local B4 = 0x00000100 * R3
local L64 = string.char( 0) .. string.char( 0) .. string.char( 0) .. string.char( 0) -- high 32 bits
.. string.char(B1) .. string.char(B2) .. string.char(B3) .. string.char(B4) -- low 32 bits
msg = msg .. first_append .. second_append .. L64
base.assert(#msg % 64 == 0)
--local fd = io.open("/tmp/msg", "wb")
--fd:write(msg)
--fd:close()
local chunks = #msg / 64
local W = { }
local start, A, B, C, D, E, f, K, TEMP
local chunk = 0
while chunk < chunks do
--
-- break chunk up into W[0] through W[15]
--
start = chunk * 64 + 1
chunk = chunk + 1
for t = 0, 15 do
W[t] = from_hex(string.format("%02x%02x%02x%02x", msg:byte(start, start + 3)))
start = start + 4
end
--
-- build W[16] through W[79]
--
for t = 16, 79 do
-- For t = 16 to 79 let Wt = S1(Wt-3 XOR Wt-8 XOR Wt-14 XOR Wt-16).
W[t] = ROTATE(1, XOR(W[t-3], W[t-8], W[t-14], W[t-16]))
end
A = H0
B = H1
C = H2
D = H3
E = H4
for t = 0, 79 do
if t <= 19 then
-- (B AND C) OR ((NOT B) AND D)
f = OR(AND(B, C), AND(NOT(B), D))
K = x5A827999
elseif t <= 39 then
-- B XOR C XOR D
f = XOR(B, C, D)
K = x6ED9EBA1
elseif t <= 59 then
-- (B AND C) OR (B AND D) OR (C AND D
f = OR3(AND(B, C), AND(B, D), AND(C, D))
K = x8F1BBCDC
else
-- B XOR C XOR D
f = XOR(B, C, D)
K = xCA62C1D6
end
-- TEMP = S5(A) + ft(B,C,D) + E + Wt + Kt;
TEMP = ADD(ROTATE(5, A), f, E, W[t], K)
E = D
D = C
C = ROTATE(30, B)
B = A
A = TEMP
--printf("t = %2d: %s %s %s %s %s", t, A:HEX(), B:HEX(), C:HEX(), D:HEX(), E:HEX())
end
-- Let H0 = H0 + A, H1 = H1 + B, H2 = H2 + C, H3 = H3 + D, H4 = H4 + E.
H0 = ADD(H0, A)
H1 = ADD(H1, B)
H2 = ADD(H2, C)
H3 = ADD(H3, D)
H4 = ADD(H4, E)
end
return asHEX(H0) .. asHEX(H1) .. asHEX(H2) .. asHEX(H3) .. asHEX(H4)
end
local function hex_to_binary(hex)
return hex:gsub('..', function(hexval)
return string.char(base.tonumber(hexval, 16))
end)
end
function sha1_binary(msg)
return hex_to_binary(sha1(msg))
end
local xor_with_0x5c = {
[string.char( 0)] = string.char( 92), [string.char( 1)] = string.char( 93),
[string.char( 2)] = string.char( 94), [string.char( 3)] = string.char( 95),
[string.char( 4)] = string.char( 88), [string.char( 5)] = string.char( 89),
[string.char( 6)] = string.char( 90), [string.char( 7)] = string.char( 91),
[string.char( 8)] = string.char( 84), [string.char( 9)] = string.char( 85),
[string.char( 10)] = string.char( 86), [string.char( 11)] = string.char( 87),
[string.char( 12)] = string.char( 80), [string.char( 13)] = string.char( 81),
[string.char( 14)] = string.char( 82), [string.char( 15)] = string.char( 83),
[string.char( 16)] = string.char( 76), [string.char( 17)] = string.char( 77),
[string.char( 18)] = string.char( 78), [string.char( 19)] = string.char( 79),
[string.char( 20)] = string.char( 72), [string.char( 21)] = string.char( 73),
[string.char( 22)] = string.char( 74), [string.char( 23)] = string.char( 75),
[string.char( 24)] = string.char( 68), [string.char( 25)] = string.char( 69),
[string.char( 26)] = string.char( 70), [string.char( 27)] = string.char( 71),
[string.char( 28)] = string.char( 64), [string.char( 29)] = string.char( 65),
[string.char( 30)] = string.char( 66), [string.char( 31)] = string.char( 67),
[string.char( 32)] = string.char(124), [string.char( 33)] = string.char(125),
[string.char( 34)] = string.char(126), [string.char( 35)] = string.char(127),
[string.char( 36)] = string.char(120), [string.char( 37)] = string.char(121),
[string.char( 38)] = string.char(122), [string.char( 39)] = string.char(123),
[string.char( 40)] = string.char(116), [string.char( 41)] = string.char(117),
[string.char( 42)] = string.char(118), [string.char( 43)] = string.char(119),
[string.char( 44)] = string.char(112), [string.char( 45)] = string.char(113),
[string.char( 46)] = string.char(114), [string.char( 47)] = string.char(115),
[string.char( 48)] = string.char(108), [string.char( 49)] = string.char(109),
[string.char( 50)] = string.char(110), [string.char( 51)] = string.char(111),
[string.char( 52)] = string.char(104), [string.char( 53)] = string.char(105),
[string.char( 54)] = string.char(106), [string.char( 55)] = string.char(107),
[string.char( 56)] = string.char(100), [string.char( 57)] = string.char(101),
[string.char( 58)] = string.char(102), [string.char( 59)] = string.char(103),
[string.char( 60)] = string.char( 96), [string.char( 61)] = string.char( 97),
[string.char( 62)] = string.char( 98), [string.char( 63)] = string.char( 99),
[string.char( 64)] = string.char( 28), [string.char( 65)] = string.char( 29),
[string.char( 66)] = string.char( 30), [string.char( 67)] = string.char( 31),
[string.char( 68)] = string.char( 24), [string.char( 69)] = string.char( 25),
[string.char( 70)] = string.char( 26), [string.char( 71)] = string.char( 27),
[string.char( 72)] = string.char( 20), [string.char( 73)] = string.char( 21),
[string.char( 74)] = string.char( 22), [string.char( 75)] = string.char( 23),
[string.char( 76)] = string.char( 16), [string.char( 77)] = string.char( 17),
[string.char( 78)] = string.char( 18), [string.char( 79)] = string.char( 19),
[string.char( 80)] = string.char( 12), [string.char( 81)] = string.char( 13),
[string.char( 82)] = string.char( 14), [string.char( 83)] = string.char( 15),
[string.char( 84)] = string.char( 8), [string.char( 85)] = string.char( 9),
[string.char( 86)] = string.char( 10), [string.char( 87)] = string.char( 11),
[string.char( 88)] = string.char( 4), [string.char( 89)] = string.char( 5),
[string.char( 90)] = string.char( 6), [string.char( 91)] = string.char( 7),
[string.char( 92)] = string.char( 0), [string.char( 93)] = string.char( 1),
[string.char( 94)] = string.char( 2), [string.char( 95)] = string.char( 3),
[string.char( 96)] = string.char( 60), [string.char( 97)] = string.char( 61),
[string.char( 98)] = string.char( 62), [string.char( 99)] = string.char( 63),
[string.char(100)] = string.char( 56), [string.char(101)] = string.char( 57),
[string.char(102)] = string.char( 58), [string.char(103)] = string.char( 59),
[string.char(104)] = string.char( 52), [string.char(105)] = string.char( 53),
[string.char(106)] = string.char( 54), [string.char(107)] = string.char( 55),
[string.char(108)] = string.char( 48), [string.char(109)] = string.char( 49),
[string.char(110)] = string.char( 50), [string.char(111)] = string.char( 51),
[string.char(112)] = string.char( 44), [string.char(113)] = string.char( 45),
[string.char(114)] = string.char( 46), [string.char(115)] = string.char( 47),
[string.char(116)] = string.char( 40), [string.char(117)] = string.char( 41),
[string.char(118)] = string.char( 42), [string.char(119)] = string.char( 43),
[string.char(120)] = string.char( 36), [string.char(121)] = string.char( 37),
[string.char(122)] = string.char( 38), [string.char(123)] = string.char( 39),
[string.char(124)] = string.char( 32), [string.char(125)] = string.char( 33),
[string.char(126)] = string.char( 34), [string.char(127)] = string.char( 35),
[string.char(128)] = string.char(220), [string.char(129)] = string.char(221),
[string.char(130)] = string.char(222), [string.char(131)] = string.char(223),
[string.char(132)] = string.char(216), [string.char(133)] = string.char(217),
[string.char(134)] = string.char(218), [string.char(135)] = string.char(219),
[string.char(136)] = string.char(212), [string.char(137)] = string.char(213),
[string.char(138)] = string.char(214), [string.char(139)] = string.char(215),
[string.char(140)] = string.char(208), [string.char(141)] = string.char(209),
[string.char(142)] = string.char(210), [string.char(143)] = string.char(211),
[string.char(144)] = string.char(204), [string.char(145)] = string.char(205),
[string.char(146)] = string.char(206), [string.char(147)] = string.char(207),
[string.char(148)] = string.char(200), [string.char(149)] = string.char(201),
[string.char(150)] = string.char(202), [string.char(151)] = string.char(203),
[string.char(152)] = string.char(196), [string.char(153)] = string.char(197),
[string.char(154)] = string.char(198), [string.char(155)] = string.char(199),
[string.char(156)] = string.char(192), [string.char(157)] = string.char(193),
[string.char(158)] = string.char(194), [string.char(159)] = string.char(195),
[string.char(160)] = string.char(252), [string.char(161)] = string.char(253),
[string.char(162)] = string.char(254), [string.char(163)] = string.char(255),
[string.char(164)] = string.char(248), [string.char(165)] = string.char(249),
[string.char(166)] = string.char(250), [string.char(167)] = string.char(251),
[string.char(168)] = string.char(244), [string.char(169)] = string.char(245),
[string.char(170)] = string.char(246), [string.char(171)] = string.char(247),
[string.char(172)] = string.char(240), [string.char(173)] = string.char(241),
[string.char(174)] = string.char(242), [string.char(175)] = string.char(243),
[string.char(176)] = string.char(236), [string.char(177)] = string.char(237),
[string.char(178)] = string.char(238), [string.char(179)] = string.char(239),
[string.char(180)] = string.char(232), [string.char(181)] = string.char(233),
[string.char(182)] = string.char(234), [string.char(183)] = string.char(235),
[string.char(184)] = string.char(228), [string.char(185)] = string.char(229),
[string.char(186)] = string.char(230), [string.char(187)] = string.char(231),
[string.char(188)] = string.char(224), [string.char(189)] = string.char(225),
[string.char(190)] = string.char(226), [string.char(191)] = string.char(227),
[string.char(192)] = string.char(156), [string.char(193)] = string.char(157),
[string.char(194)] = string.char(158), [string.char(195)] = string.char(159),
[string.char(196)] = string.char(152), [string.char(197)] = string.char(153),
[string.char(198)] = string.char(154), [string.char(199)] = string.char(155),
[string.char(200)] = string.char(148), [string.char(201)] = string.char(149),
[string.char(202)] = string.char(150), [string.char(203)] = string.char(151),
[string.char(204)] = string.char(144), [string.char(205)] = string.char(145),
[string.char(206)] = string.char(146), [string.char(207)] = string.char(147),
[string.char(208)] = string.char(140), [string.char(209)] = string.char(141),
[string.char(210)] = string.char(142), [string.char(211)] = string.char(143),
[string.char(212)] = string.char(136), [string.char(213)] = string.char(137),
[string.char(214)] = string.char(138), [string.char(215)] = string.char(139),
[string.char(216)] = string.char(132), [string.char(217)] = string.char(133),
[string.char(218)] = string.char(134), [string.char(219)] = string.char(135),
[string.char(220)] = string.char(128), [string.char(221)] = string.char(129),
[string.char(222)] = string.char(130), [string.char(223)] = string.char(131),
[string.char(224)] = string.char(188), [string.char(225)] = string.char(189),
[string.char(226)] = string.char(190), [string.char(227)] = string.char(191),
[string.char(228)] = string.char(184), [string.char(229)] = string.char(185),
[string.char(230)] = string.char(186), [string.char(231)] = string.char(187),
[string.char(232)] = string.char(180), [string.char(233)] = string.char(181),
[string.char(234)] = string.char(182), [string.char(235)] = string.char(183),
[string.char(236)] = string.char(176), [string.char(237)] = string.char(177),
[string.char(238)] = string.char(178), [string.char(239)] = string.char(179),
[string.char(240)] = string.char(172), [string.char(241)] = string.char(173),
[string.char(242)] = string.char(174), [string.char(243)] = string.char(175),
[string.char(244)] = string.char(168), [string.char(245)] = string.char(169),
[string.char(246)] = string.char(170), [string.char(247)] = string.char(171),
[string.char(248)] = string.char(164), [string.char(249)] = string.char(165),
[string.char(250)] = string.char(166), [string.char(251)] = string.char(167),
[string.char(252)] = string.char(160), [string.char(253)] = string.char(161),
[string.char(254)] = string.char(162), [string.char(255)] = string.char(163),
}
local xor_with_0x36 = {
[string.char( 0)] = string.char( 54), [string.char( 1)] = string.char( 55),
[string.char( 2)] = string.char( 52), [string.char( 3)] = string.char( 53),
[string.char( 4)] = string.char( 50), [string.char( 5)] = string.char( 51),
[string.char( 6)] = string.char( 48), [string.char( 7)] = string.char( 49),
[string.char( 8)] = string.char( 62), [string.char( 9)] = string.char( 63),
[string.char( 10)] = string.char( 60), [string.char( 11)] = string.char( 61),
[string.char( 12)] = string.char( 58), [string.char( 13)] = string.char( 59),
[string.char( 14)] = string.char( 56), [string.char( 15)] = string.char( 57),
[string.char( 16)] = string.char( 38), [string.char( 17)] = string.char( 39),
[string.char( 18)] = string.char( 36), [string.char( 19)] = string.char( 37),
[string.char( 20)] = string.char( 34), [string.char( 21)] = string.char( 35),
[string.char( 22)] = string.char( 32), [string.char( 23)] = string.char( 33),
[string.char( 24)] = string.char( 46), [string.char( 25)] = string.char( 47),
[string.char( 26)] = string.char( 44), [string.char( 27)] = string.char( 45),
[string.char( 28)] = string.char( 42), [string.char( 29)] = string.char( 43),
[string.char( 30)] = string.char( 40), [string.char( 31)] = string.char( 41),
[string.char( 32)] = string.char( 22), [string.char( 33)] = string.char( 23),
[string.char( 34)] = string.char( 20), [string.char( 35)] = string.char( 21),
[string.char( 36)] = string.char( 18), [string.char( 37)] = string.char( 19),
[string.char( 38)] = string.char( 16), [string.char( 39)] = string.char( 17),
[string.char( 40)] = string.char( 30), [string.char( 41)] = string.char( 31),
[string.char( 42)] = string.char( 28), [string.char( 43)] = string.char( 29),
[string.char( 44)] = string.char( 26), [string.char( 45)] = string.char( 27),
[string.char( 46)] = string.char( 24), [string.char( 47)] = string.char( 25),
[string.char( 48)] = string.char( 6), [string.char( 49)] = string.char( 7),
[string.char( 50)] = string.char( 4), [string.char( 51)] = string.char( 5),
[string.char( 52)] = string.char( 2), [string.char( 53)] = string.char( 3),
[string.char( 54)] = string.char( 0), [string.char( 55)] = string.char( 1),
[string.char( 56)] = string.char( 14), [string.char( 57)] = string.char( 15),
[string.char( 58)] = string.char( 12), [string.char( 59)] = string.char( 13),
[string.char( 60)] = string.char( 10), [string.char( 61)] = string.char( 11),
[string.char( 62)] = string.char( 8), [string.char( 63)] = string.char( 9),
[string.char( 64)] = string.char(118), [string.char( 65)] = string.char(119),
[string.char( 66)] = string.char(116), [string.char( 67)] = string.char(117),
[string.char( 68)] = string.char(114), [string.char( 69)] = string.char(115),
[string.char( 70)] = string.char(112), [string.char( 71)] = string.char(113),
[string.char( 72)] = string.char(126), [string.char( 73)] = string.char(127),
[string.char( 74)] = string.char(124), [string.char( 75)] = string.char(125),
[string.char( 76)] = string.char(122), [string.char( 77)] = string.char(123),
[string.char( 78)] = string.char(120), [string.char( 79)] = string.char(121),
[string.char( 80)] = string.char(102), [string.char( 81)] = string.char(103),
[string.char( 82)] = string.char(100), [string.char( 83)] = string.char(101),
[string.char( 84)] = string.char( 98), [string.char( 85)] = string.char( 99),
[string.char( 86)] = string.char( 96), [string.char( 87)] = string.char( 97),
[string.char( 88)] = string.char(110), [string.char( 89)] = string.char(111),
[string.char( 90)] = string.char(108), [string.char( 91)] = string.char(109),
[string.char( 92)] = string.char(106), [string.char( 93)] = string.char(107),
[string.char( 94)] = string.char(104), [string.char( 95)] = string.char(105),
[string.char( 96)] = string.char( 86), [string.char( 97)] = string.char( 87),
[string.char( 98)] = string.char( 84), [string.char( 99)] = string.char( 85),
[string.char(100)] = string.char( 82), [string.char(101)] = string.char( 83),
[string.char(102)] = string.char( 80), [string.char(103)] = string.char( 81),
[string.char(104)] = string.char( 94), [string.char(105)] = string.char( 95),
[string.char(106)] = string.char( 92), [string.char(107)] = string.char( 93),
[string.char(108)] = string.char( 90), [string.char(109)] = string.char( 91),
[string.char(110)] = string.char( 88), [string.char(111)] = string.char( 89),
[string.char(112)] = string.char( 70), [string.char(113)] = string.char( 71),
[string.char(114)] = string.char( 68), [string.char(115)] = string.char( 69),
[string.char(116)] = string.char( 66), [string.char(117)] = string.char( 67),
[string.char(118)] = string.char( 64), [string.char(119)] = string.char( 65),
[string.char(120)] = string.char( 78), [string.char(121)] = string.char( 79),
[string.char(122)] = string.char( 76), [string.char(123)] = string.char( 77),
[string.char(124)] = string.char( 74), [string.char(125)] = string.char( 75),
[string.char(126)] = string.char( 72), [string.char(127)] = string.char( 73),
[string.char(128)] = string.char(182), [string.char(129)] = string.char(183),
[string.char(130)] = string.char(180), [string.char(131)] = string.char(181),
[string.char(132)] = string.char(178), [string.char(133)] = string.char(179),
[string.char(134)] = string.char(176), [string.char(135)] = string.char(177),
[string.char(136)] = string.char(190), [string.char(137)] = string.char(191),
[string.char(138)] = string.char(188), [string.char(139)] = string.char(189),
[string.char(140)] = string.char(186), [string.char(141)] = string.char(187),
[string.char(142)] = string.char(184), [string.char(143)] = string.char(185),
[string.char(144)] = string.char(166), [string.char(145)] = string.char(167),
[string.char(146)] = string.char(164), [string.char(147)] = string.char(165),
[string.char(148)] = string.char(162), [string.char(149)] = string.char(163),
[string.char(150)] = string.char(160), [string.char(151)] = string.char(161),
[string.char(152)] = string.char(174), [string.char(153)] = string.char(175),
[string.char(154)] = string.char(172), [string.char(155)] = string.char(173),
[string.char(156)] = string.char(170), [string.char(157)] = string.char(171),
[string.char(158)] = string.char(168), [string.char(159)] = string.char(169),
[string.char(160)] = string.char(150), [string.char(161)] = string.char(151),
[string.char(162)] = string.char(148), [string.char(163)] = string.char(149),
[string.char(164)] = string.char(146), [string.char(165)] = string.char(147),
[string.char(166)] = string.char(144), [string.char(167)] = string.char(145),
[string.char(168)] = string.char(158), [string.char(169)] = string.char(159),
[string.char(170)] = string.char(156), [string.char(171)] = string.char(157),
[string.char(172)] = string.char(154), [string.char(173)] = string.char(155),
[string.char(174)] = string.char(152), [string.char(175)] = string.char(153),
[string.char(176)] = string.char(134), [string.char(177)] = string.char(135),
[string.char(178)] = string.char(132), [string.char(179)] = string.char(133),
[string.char(180)] = string.char(130), [string.char(181)] = string.char(131),
[string.char(182)] = string.char(128), [string.char(183)] = string.char(129),
[string.char(184)] = string.char(142), [string.char(185)] = string.char(143),
[string.char(186)] = string.char(140), [string.char(187)] = string.char(141),
[string.char(188)] = string.char(138), [string.char(189)] = string.char(139),
[string.char(190)] = string.char(136), [string.char(191)] = string.char(137),
[string.char(192)] = string.char(246), [string.char(193)] = string.char(247),
[string.char(194)] = string.char(244), [string.char(195)] = string.char(245),
[string.char(196)] = string.char(242), [string.char(197)] = string.char(243),
[string.char(198)] = string.char(240), [string.char(199)] = string.char(241),
[string.char(200)] = string.char(254), [string.char(201)] = string.char(255),
[string.char(202)] = string.char(252), [string.char(203)] = string.char(253),
[string.char(204)] = string.char(250), [string.char(205)] = string.char(251),
[string.char(206)] = string.char(248), [string.char(207)] = string.char(249),
[string.char(208)] = string.char(230), [string.char(209)] = string.char(231),
[string.char(210)] = string.char(228), [string.char(211)] = string.char(229),
[string.char(212)] = string.char(226), [string.char(213)] = string.char(227),
[string.char(214)] = string.char(224), [string.char(215)] = string.char(225),
[string.char(216)] = string.char(238), [string.char(217)] = string.char(239),
[string.char(218)] = string.char(236), [string.char(219)] = string.char(237),
[string.char(220)] = string.char(234), [string.char(221)] = string.char(235),
[string.char(222)] = string.char(232), [string.char(223)] = string.char(233),
[string.char(224)] = string.char(214), [string.char(225)] = string.char(215),
[string.char(226)] = string.char(212), [string.char(227)] = string.char(213),
[string.char(228)] = string.char(210), [string.char(229)] = string.char(211),
[string.char(230)] = string.char(208), [string.char(231)] = string.char(209),
[string.char(232)] = string.char(222), [string.char(233)] = string.char(223),
[string.char(234)] = string.char(220), [string.char(235)] = string.char(221),
[string.char(236)] = string.char(218), [string.char(237)] = string.char(219),
[string.char(238)] = string.char(216), [string.char(239)] = string.char(217),
[string.char(240)] = string.char(198), [string.char(241)] = string.char(199),
[string.char(242)] = string.char(196), [string.char(243)] = string.char(197),
[string.char(244)] = string.char(194), [string.char(245)] = string.char(195),
[string.char(246)] = string.char(192), [string.char(247)] = string.char(193),
[string.char(248)] = string.char(206), [string.char(249)] = string.char(207),
[string.char(250)] = string.char(204), [string.char(251)] = string.char(205),
[string.char(252)] = string.char(202), [string.char(253)] = string.char(203),
[string.char(254)] = string.char(200), [string.char(255)] = string.char(201),
}
local blocksize = 64 -- 512 bits
function hmac_sha1(key, text)
base.assert(base.type(key) == 'string', "key passed to hmac_sha1 should be a string")
base.assert(base.type(text) == 'string', "text passed to hmac_sha1 should be a string")
if #key > blocksize then
key = sha1_binary(key)
end
local key_xord_with_0x36 = key:gsub('.', xor_with_0x36) .. string.rep(string.char(0x36), blocksize - #key)
local key_xord_with_0x5c = key:gsub('.', xor_with_0x5c) .. string.rep(string.char(0x5c), blocksize - #key)
return sha1(key_xord_with_0x5c .. sha1_binary(key_xord_with_0x36 .. text))
end
function hmac_sha1_binary(key, text)
return hex_to_binary(hmac_sha1(key, text))
end
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