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199 lines
5.0 KiB
199 lines
5.0 KiB
--
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-- Code merged by gravityscore at http://pastebin.com/gsFrNjbt
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--
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-- Adaptation of the Secure Hashing Algorithm (SHA-244/256)
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-- Found Here: http://lua-users.org/wiki/SecureHashAlgorithm
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--
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-- Using an adapted version of the bit library
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-- Found Here: https://bitbucket.org/Boolsheet/bslf/src/1ee664885805/bit.lua
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--
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module("luci.sha256", package.seeall)
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local MOD = 2 ^ 32
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local MODM = MOD - 1
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local function memoize(f)
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local mt = {}
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local t = setmetatable({}, mt)
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function mt:__index(k)
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local v = f(k)
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t[k] = v
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return v
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end
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return t
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end
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local function make_bitop_uncached(t, m)
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local function bitop(a, b)
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local res, p = 0, 1
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while a ~= 0 and b ~= 0 do
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local am, bm = a % m, b % m
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res = res + t[am][bm] * p
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a = (a - am) / m
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b = (b - bm) / m
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p = p * m
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end
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res = res + (a + b) * p
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return res
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end
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return bitop
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end
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local function make_bitop(t)
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local op1 = make_bitop_uncached(t, 2 ^ 1)
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local op2 = memoize(function(a) return memoize(function(b) return op1(a, b) end) end)
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return make_bitop_uncached(op2, 2 ^ (t.n or 1))
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end
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local bxor1 = make_bitop({ [0] = { [0] = 0, [1] = 1 }, [1] = { [0] = 1, [1] = 0 }, n = 4 })
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local function bxor(a, b, c, ...)
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local z = nil
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if b then
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a = a % MOD
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b = b % MOD
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z = bxor1(a, b)
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if c then z = bxor(z, c, ...) end
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return z
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elseif a then return a % MOD
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else return 0
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end
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end
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local function band(a, b, c, ...)
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local z
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if b then
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a = a % MOD
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b = b % MOD
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z = ((a + b) - bxor1(a, b)) / 2
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if c then z = bit32_band(z, c, ...) end
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return z
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elseif a then return a % MOD
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else return MODM
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end
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end
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local function bnot(x) return (-1 - x) % MOD end
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local function rshift1(a, disp)
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if disp < 0 then return lshift(a, -disp) end
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return math.floor(a % 2 ^ 32 / 2 ^ disp)
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end
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local function rshift(x, disp)
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if disp > 31 or disp < -31 then return 0 end
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return rshift1(x % MOD, disp)
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end
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local function lshift(a, disp)
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if disp < 0 then return rshift(a, -disp) end
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return (a * 2 ^ disp) % 2 ^ 32
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end
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local function rrotate(x, disp)
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x = x % MOD
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disp = disp % 32
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local low = band(x, 2 ^ disp - 1)
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return rshift(x, disp) + lshift(low, 32 - disp)
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end
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local k = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
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}
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local function str2hexa(s)
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return (string.gsub(s, ".", function(c) return string.format("%02x", string.byte(c)) end))
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end
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local function num2s(l, n)
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local s = ""
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for i = 1, n do
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local rem = l % 256
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s = string.char(rem) .. s
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l = (l - rem) / 256
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end
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return s
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end
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local function s232num(s, i)
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local n = 0
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for i = i, i + 3 do n = n * 256 + string.byte(s, i) end
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return n
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end
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local function preproc(msg, len)
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local extra = 64 - ((len + 9) % 64)
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len = num2s(8 * len, 8)
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msg = msg .. "\128" .. string.rep("\0", extra) .. len
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assert(#msg % 64 == 0)
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return msg
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end
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local function initH256(H)
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H[1] = 0x6a09e667
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H[2] = 0xbb67ae85
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H[3] = 0x3c6ef372
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H[4] = 0xa54ff53a
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H[5] = 0x510e527f
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H[6] = 0x9b05688c
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H[7] = 0x1f83d9ab
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H[8] = 0x5be0cd19
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return H
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end
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local function digestblock(msg, i, H)
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local w = {}
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for j = 1, 16 do w[j] = s232num(msg, i + (j - 1) * 4) end
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for j = 17, 64 do
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local v = w[j - 15]
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local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3))
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v = w[j - 2]
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w[j] = w[j - 16] + s0 + w[j - 7] + bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10))
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end
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local a, b, c, d, e, f, g, h = H[1], H[2], H[3], H[4], H[5], H[6], H[7], H[8]
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for i = 1, 64 do
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local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22))
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local maj = bxor(band(a, b), band(a, c), band(b, c))
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local t2 = s0 + maj
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local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25))
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local ch = bxor(band(e, f), band(bnot(e), g))
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local t1 = h + s1 + ch + k[i] + w[i]
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h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2
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end
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H[1] = band(H[1] + a)
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H[2] = band(H[2] + b)
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H[3] = band(H[3] + c)
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H[4] = band(H[4] + d)
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H[5] = band(H[5] + e)
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H[6] = band(H[6] + f)
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H[7] = band(H[7] + g)
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H[8] = band(H[8] + h)
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end
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function sha256(msg)
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msg = preproc(msg, #msg)
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local H = initH256({})
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for i = 1, #msg, 64 do digestblock(msg, i, H) end
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return str2hexa(num2s(H[1], 4) .. num2s(H[2], 4) .. num2s(H[3], 4) .. num2s(H[4], 4) ..
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num2s(H[5], 4) .. num2s(H[6], 4) .. num2s(H[7], 4) .. num2s(H[8], 4))
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end
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