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Stefanuk12

SHA256

Jul 12th, 2021
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Lua 3.83 KB | None | 0 0
  1. local hash; do
  2.     local MOD = 2^32
  3.     local MODM = MOD-1
  4.     local bxor = bit32.bxor;
  5.     local band = bit32.band;
  6.     local bnot = bit32.bnot;
  7.     local rshift1 = bit32.rshift;
  8.     local rshift = bit32.rshift;
  9.     local lshift = bit32.lshift;
  10.     local rrotate = bit32.rrotate;
  11.  
  12.     local str_gsub = string.gsub;
  13.     local str_fmt = string.format;
  14.     local str_byte = string.byte;
  15.     local str_char = string.char;
  16.     local str_rep = string.rep;
  17.  
  18.     local k = {
  19.         0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
  20.         0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
  21.         0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
  22.         0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
  23.         0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
  24.         0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  25.         0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
  26.         0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
  27.         0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
  28.         0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
  29.         0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
  30.         0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  31.         0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
  32.         0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
  33.         0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
  34.         0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
  35.     }
  36.     local function str2hexa(s)
  37.         return (str_gsub(s, ".", function(c) return str_fmt("%02x", str_byte(c)) end))
  38.     end
  39.     local function num2s(l, n)
  40.         local s = ""
  41.         for i = 1, n do
  42.             local rem = l % 256
  43.             s = str_char(rem) .. s
  44.             l = (l - rem) / 256
  45.         end
  46.         return s
  47.     end
  48.     local function s232num(s, i)
  49.         local n = 0
  50.         for i = i, i + 3 do n = n*256 + str_byte(s, i) end
  51.         return n
  52.         end
  53.         local function preproc(msg, len)
  54.         local extra = 64 - ((len + 9) % 64)
  55.         len = num2s(8 * len, 8)
  56.         msg = msg .. "\128" .. str_rep("\0", extra) .. len
  57.         assert(#msg % 64 == 0)
  58.         return msg
  59.     end
  60.     local function initH256(H)
  61.         H[1] = 0x6a09e667
  62.         H[2] = 0xbb67ae85
  63.         H[3] = 0x3c6ef372
  64.         H[4] = 0xa54ff53a
  65.         H[5] = 0x510e527f
  66.         H[6] = 0x9b05688c
  67.         H[7] = 0x1f83d9ab
  68.         H[8] = 0x5be0cd19
  69.         return H
  70.     end
  71.     local function digestblock(msg, i, H)
  72.         local w = {}
  73.         for j = 1, 16 do w[j] = s232num(msg, i + (j - 1)*4) end
  74.         for j = 17, 64 do
  75.             local v = w[j - 15]
  76.             local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3))
  77.             v = w[j - 2]
  78.             w[j] = w[j - 16] + s0 + w[j - 7] + bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10))
  79.         end
  80.         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]
  81.         for i = 1, 64 do
  82.             local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22))
  83.             local maj = bxor(band(a, b), band(a, c), band(b, c))
  84.             local t2 = s0 + maj
  85.             local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25))
  86.             local ch = bxor(band(e, f), band(bnot(e), g))
  87.             local t1 = h + s1 + ch + k[i] + w[i]
  88.             h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2
  89.         end
  90.         H[1] = band(H[1] + a)
  91.         H[2] = band(H[2] + b)
  92.         H[3] = band(H[3] + c)
  93.         H[4] = band(H[4] + d)
  94.         H[5] = band(H[5] + e)
  95.         H[6] = band(H[6] + f)
  96.         H[7] = band(H[7] + g)
  97.         H[8] = band(H[8] + h)
  98.     end
  99.     function hash(msg, t)
  100.         msg = preproc(msg, #msg)
  101.         local H = initH256({})
  102.         for i = 1, #msg, 64 do digestblock(msg, i, H) end
  103.         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))
  104.     end
  105. end
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