# SHA-256 squashed

Nov 4th, 2015
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1. --  [[Adaptation of the Secure Hashing Algorithm (SHA-244/256) Found Here: http://lua-users.org/wiki/SecureHashAlgorithm Using an adapted version of the bit library Found Here: https://bitbucket.org/Boolsheet/bslf/src/1ee664885805/bit.lua Taken from http://www.computercraft.info/forums2/index.php?/topic/8169-sha-256-in-pure-lua/ and http://pastebin.com/gsFrNjbt]]
2. local hash do
3. local MOD = 2^32  local MODM = MOD-1 local function memoize(f) local mt = {} local t = setmetatable({}, mt) function mt:__index(k) local v = f(k) t[k] = v return v end return t end  local function make_bitop_uncached(t, m) local function bitop(a, b) local res,p = 0,1 while a ~= 0 and b ~= 0 do local am, bm = a % m, b % m res = res + t[am][bm] * p a = (a - am) / m b = (b - bm) / m p = p*m end res = res + (a + b) * p return res end return bitop end  local function make_bitop(t) local op1 = make_bitop_uncached(t,2^1) local op2 = memoize(function(a) return memoize(function(b) return op1(a, b) end) end) return make_bitop_uncached(op2, 2 ^ (t.n or 1)) end  local bxor1 = make_bitop({[0] = {[0] = 0,[1] = 1}, [1] = {[0] = 1, [1] = 0}, n = 4})  local function bxor(a, b, c, ...) local z = nil if b then a = a % MOD b = b % MOD z = bxor1(a, b) if c then z = bxor(z, c, ...) end return z elseif a then return a % MOD else return 0 end end  local function band(a, b, c, ...) local z if b then a = a % MOD b = b % MOD z = ((a + b) - bxor1(a,b)) / 2 if c then z = bit32_band(z, c, ...) end return z elseif a then return a % MOD else return MODM end end  local function bnot(x) return (-1 - x) % MOD end  local function rshift1(a, disp) if disp < 0 then return lshift(a,-disp) end return math.floor(a % 2 ^ 32 / 2 ^ disp) end  local function rshift(x, disp) if disp > 31 or disp < -31 then return 0 end return rshift1(x % MOD, disp) end  local function lshift(a, disp) if disp < 0 then return rshift(a,-disp) end  return (a * 2 ^ disp) % 2 ^ 32 end  local function rrotate(x, disp) x = x % MOD disp = disp % 32 local low = band(x, 2 ^ disp - 1) return rshift(x, disp) + lshift(low, 32 - disp) end  local k = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2, }  local function str2hexa(s) return (string.gsub(s, ".", function(c) return string.format("%02x", string.byte(c)) end)) end  local function num2s(l, n) local s = "" for i = 1, n do local rem = l % 256 s = string.char(rem) .. s l = (l - rem) / 256 end return s end  local function s232num(s, i) local n = 0 for i = i, i + 3 do n = n*256 + string.byte(s, i) end return n end  local function preproc(msg, len) local extra = 64 - ((len + 9) % 64) len = num2s(8 * len, 8) msg = msg .. "\128" .. string.rep("\0", extra) .. len assert(#msg % 64 == 0) return msg end  local function initH256(H) H[1] = 0x6a09e667 H[2] = 0xbb67ae85 H[3] = 0x3c6ef372 H[4] = 0xa54ff53a H[5] = 0x510e527f H[6] = 0x9b05688c H[7] = 0x1f83d9ab H[8] = 0x5be0cd19 return H end  local function digestblock(msg, i, H) local w = {} for j = 1, 16 do w[j] = s232num(msg, i + (j - 1)*4) end for j = 17, 64 do local v = w[j - 15] local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3)) v = w[j - 2] w[j] = w[j - 16] + s0 + w[j - 7] + bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10)) end  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] for i = 1, 64 do local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22)) local maj = bxor(band(a, b), band(a, c), band(b, c)) local t2 = s0 + maj local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25)) local ch = bxor (band(e, f), band(bnot(e), g)) local t1 = h + s1 + ch + k[i] + w[i] h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2 end  H[1] = band(H[1] + a) H[2] = band(H[2] + b) H[3] = band(H[3] + c) H[4] = band(H[4] + d) H[5] = band(H[5] + e) H[6] = band(H[6] + f) H[7] = band(H[7] + g) H[8] = band(H[8] + h) end  local function sha256(msg) msg = preproc(msg, #msg) local H = initH256({}) for i = 1, #msg, 64 do digestblock(msg, i, H) end return str2hexa(num2s(H[1], 4) .. num2s(H[2], 4) .. num2s(H[3], 4) .. num2s(H[4], 4) .. num2s(H[5], 4) .. num2s(H[6], 4) .. num2s(H[7], 4) .. num2s(H[8], 4)) end hash = sha256 end
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