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  1. local LibDeflate = {}
  2. local string_byte = string.byte
  3.  
  4. -- Calculate xor for two unsigned 8bit numbers (0 <= a,b <= 255)
  5. local function Xor8(a, b)
  6.     local ret = 0
  7.     local fact = 128
  8.     while fact > a and fact > b do
  9.         fact = fact / 2
  10.     end
  11.     while fact >= 1 do
  12.         ret = ret + (((a >= fact or b >= fact)
  13.             and (a < fact or b < fact)) and fact or 0)
  14.         a = a - ((a >= fact) and fact or 0)
  15.         b = b - ((b >= fact) and fact or 0)
  16.         fact = fact / 2
  17.     end
  18.     return ret
  19. end
  20.  
  21. -- table to cache the result of uint8 xor(x, y)  (0<=x,y<=255)
  22. local _xor8_table
  23.  
  24. local function GenerateXorTable()
  25.     assert(not _xor8_table)
  26.     _xor8_table = {}
  27.     for i = 0, 255 do
  28.         local t = {}
  29.         _xor8_table[i] = t
  30.         for j = 0, 255 do
  31.             t[j] = Xor8(i, j)
  32.         end
  33.     end
  34. end
  35.  
  36.  
  37. -- 4 CRC tables.
  38. -- Each table one byte of the value in the traditional crc32 table.
  39. -- _crc_table0 stores the least significant byte.
  40. -- _crc_table3 stores the most significant byte.
  41. -- These tables are generated by the following script.
  42. --[[
  43. for n = 0, 255 do
  44.     local c = n
  45.     for k = 0, 7 do
  46.         local m = c % 2
  47.         local d = (c-m)/2
  48.         if m > 0 then
  49.             c = xor32(0xedb88320, d)
  50.         else
  51.             c = d
  52.         end
  53.     end
  54.  
  55.     local c0, c1, c2, c3
  56.  
  57.     c0 = c % 256
  58.     c = (c - c0) / 256
  59.     c1 = c % 256
  60.     c = (c - c1) / 256
  61.     c2 = c % 256
  62.     c = (c - c2) / 256
  63.     c3 = c % 256
  64.     _crc_table0[n] = c0
  65.     _crc_table1[n] = c1
  66.     _crc_table2[n] = c2
  67.     _crc_table3[n] = c3
  68. end
  69. ]]
  70. local _crc_table0 = {
  71.     [0]=0,150,44,186,25,143,53,163,50,164,30,136,43,189,7,145,100,242,72,222,
  72.     125,235,81,199,86,192,122,236,79,217,99,245,200,94,228,114,209,71,253,107,
  73.     250,108,214,64,227,117,207,89,172,58,128,22,181,35,153,15,158,8,178,36,135,
  74.     17,171,61,144,6,188,42,137,31,165,51,162,52,142,24,187,45,151,1,244,98,216,
  75.     78,237,123,193,87,198,80,234,124,223,73,243,101,88,206,116,226,65,215,109,
  76.     251,106,252,70,208,115,229,95,201,60,170,16,134,37,179,9,159,14,152,34,180,
  77.     23,129,59,173,32,182,12,154,57,175,21,131,18,132,62,168,11,157,39,177,68,
  78.     210,104,254,93,203,113,231,118,224,90,204,111,249,67,213,232,126,196,82,241,
  79.     103,221,75,218,76,246,96,195,85,239,121,140,26,160,54,149,3,185,47,190,
  80.     40,146,4,167,49,139,29,176,38,156,10,169,63,133,19,130,20,174,56,155,13,183,
  81.     33,212,66,248,110,205,91,225,119,230,112,202,92,255,105,211,69,120,238,84,
  82.     194,97,247,77,219,74,220,102,240,83,197,127,233,28,138,48,166,5,147,41,191,
  83.     46,184,2,148,55,161,27,141}
  84. local _crc_table1 = {
  85.     [0]=0,48,97,81,196,244,165,149,136,184,233,217,76,124,45,29,16,32,113,65,
  86.     212,228,181,133,152,168,249,201,92,108,61,13,32,16,65,113,228,212,133,181,
  87.     168,152,201,249,108,92,13,61,48,0,81,97,244,196,149,165,184,136,217,233,124,
  88.     76,29,45,65,113,32,16,133,181,228,212,201,249,168,152,13,61,108,92,81,97,48,
  89.     0,149,165,244,196,217,233,184,136,29,45,124,76,97,81,0,48,165,149,196,244,
  90.     233,217,136,184,45,29,76,124,113,65,16,32,181,133,212,228,249,201,152,168,
  91.     61,13,92,108,131,179,226,210,71,119,38,22,11,59,106,90,207,255,174,158,147,
  92.     163,242,194,87,103,54,6,27,43,122,74,223,239,190,142,163,147,194,242,103,87,
  93.     6,54,43,27,74,122,239,223,142,190,179,131,210,226,119,71,22,38,59,11,90,106,
  94.     255,207,158,174,194,242,163,147,6,54,103,87,74,122,43,27,142,190,239,223,
  95.     210,226,179,131,22,38,119,71,90,106,59,11,158,174,255,207,226,210,131,179,
  96.     38,22,71,119,106,90,11,59,174,158,207,255,242,194,147,163,54,6,87,103,122,
  97.     74,27,43,190,142,223,239}
  98. local _crc_table2 = {
  99.     [0]=0,7,14,9,109,106,99,100,219,220,213,210,182,177,184,191,183,176,185,190,
  100.     218,221,212,211,108,107,98,101,1,6,15,8,110,105,96,103,3,4,13,10,181,178,
  101.     187,188,216,223,214,209,217,222,215,208,180,179,186,189,2,5,12,11,111,104,
  102.     97,102,220,219,210,213,177,182,191,184,7,0,9,14,106,109,100,99,107,108,101,
  103.     98,6,1,8,15,176,183,190,185,221,218,211,212,178,181,188,187,223,216,209,214,
  104.     105,110,103,96,4,3,10,13,5,2,11,12,104,111,102,97,222,217,208,215,179,180,
  105.     189,186,184,191,182,177,213,210,219,220,99,100,109,106,14,9,0,7,15,8,1,6,98,
  106.     101,108,107,212,211,218,221,185,190,183,176,214,209,216,223,187,188,181,178,
  107.     13,10,3,4,96,103,110,105,97,102,111,104,12,11,2,5,186,189,180,179,215,208,
  108.     217,222,100,99,106,109,9,14,7,0,191,184,177,182,210,213,220,219,211,212,221,
  109.     218,190,185,176,183,8,15,6,1,101,98,107,108,10,13,4,3,103,96,105,110,209,
  110.     214,223,216,188,187,178,181,189,186,179,180,208,215,222,217,102,97,104,111,
  111.     11,12,5,2}
  112. local _crc_table3 = {
  113.     [0]=0,119,238,153,7,112,233,158,14,121,224,151,9,126,231,144,29,106,243,132,
  114.     26,109,244,131,19,100,253,138,20,99,250,141,59,76,213,162,60,75,210,165,53,
  115.     66,219,172,50,69,220,171,38,81,200,191,33,86,207,184,40,95,198,177,47,88,
  116.     193,182,118,1,152,239,113,6,159,232,120,15,150,225,127,8,145,230,107,28,133,
  117.     242,108,27,130,245,101,18,139,252,98,21,140,251,77,58,163,212,74,61,164,211,
  118.     67,52,173,218,68,51,170,221,80,39,190,201,87,32,185,206,94,41,176,199,89,46,
  119.     183,192,237,154,3,116,234,157,4,115,227,148,13,122,228,147,10,125,240,135,
  120.     30,105,247,128,25,110,254,137,16,103,249,142,23,96,214,161,56,79,209,166,63,
  121.     72,216,175,54,65,223,168,49,70,203,188,37,82,204,187,34,85,197,178,43,92,
  122.     194,181,44,91,155,236,117,2,156,235,114,5,149,226,123,12,146,229,124,11,134,
  123.     241,104,31,129,246,111,24,136,255,102,17,143,248,97,22,160,215,78,57,167,
  124.     208,73,62,174,217,64,55,169,222,71,48,189,202,83,36,186,205,84,35,179,196,
  125.     93,42,180,195,90,45}
  126.  
  127. --- Calculate the CRC-32 checksum of the string.
  128. -- @param str [string] the input string to calculate its CRC-32 checksum.
  129. -- @param init_value [nil/integer] The initial crc32 value. If nil, use 0
  130. -- @return [integer] The CRC-32 checksum, which is greater or equal to 0,
  131. -- and less than 2^32 (4294967296).
  132. function LibDeflate:Crc32(str, init_value)
  133.     -- TODO: Check argument
  134.     local crc = (init_value or 0) % 4294967296
  135.     if not _xor8_table then
  136.         GenerateXorTable()
  137.     end
  138.     -- The value of bytes of crc32
  139.     -- crc0 is the least significant byte
  140.     -- crc3 is the most significant byte
  141.     local crc0 = crc % 256
  142.     crc = (crc - crc0) / 256
  143.     local crc1 = crc % 256
  144.     crc = (crc - crc1) / 256
  145.     local crc2 = crc % 256
  146.     local crc3 = (crc - crc2) / 256
  147.  
  148.     local _xor_vs_255 = _xor8_table[255]
  149.     crc0 = _xor_vs_255[crc0]
  150.     crc1 = _xor_vs_255[crc1]
  151.     crc2 = _xor_vs_255[crc2]
  152.     crc3 = _xor_vs_255[crc3]
  153.     for i=1, #str do
  154.         local byte = string_byte(str, i)
  155.         local k = _xor8_table[crc0][byte]
  156.         crc0 = _xor8_table[_crc_table0[k] ][crc1]
  157.         crc1 = _xor8_table[_crc_table1[k] ][crc2]
  158.         crc2 = _xor8_table[_crc_table2[k] ][crc3]
  159.         crc3 = _crc_table3[k]
  160.     end
  161.     crc0 = _xor_vs_255[crc0]
  162.     crc1 = _xor_vs_255[crc1]
  163.     crc2 = _xor_vs_255[crc2]
  164.     crc3 = _xor_vs_255[crc3]
  165.     crc = crc0 + crc1*256 + crc2*65536 + crc3*16777216
  166.     return crc
  167. end
  168.  
  169. --------------------------------------------------------------------------------
  170. -- Код выше взят с https://gist.github.com/SafeteeWoW/080e784e5ebfda42cad486c58e6d26e4
  171.  
  172.  
  173. local hours = 10
  174. local minutes = 16
  175. local secretSalt = "SecretSaltString"
  176. local nickname = "MyNick"
  177.  
  178. function getHashes(nickname, hours, minutes, salt)
  179.     -- Считаем время на одну минуту назад
  180.     local prevHours = hours
  181.     local prevMinutes = minutes
  182.     if minutes == 0 then
  183.         prevMinutes = 59
  184.         if hours == 0 then
  185.             prevHours = 23
  186.         else
  187.             prevHours = hours - 1
  188.         end
  189.     else
  190.         prevMinutes = minutes - 1
  191.     end
  192.     -- Вычисляем первый хеш, без него можно набрутить простой SecretSaltString
  193.     local saltMsg1 = string.format("H%sM%sS%s", hours, minutes, salt)
  194.     local saltMsg2 = string.format("H%sM%sS%s", prevHours, prevMinutes, salt)
  195.     local saltHash1 = tostring(LibDeflate:Crc32(saltMsg1, 0))
  196.     local saltHash2 = tostring(LibDeflate:Crc32(saltMsg2, 0))
  197.     -- Вычисляем второй хеш
  198.     local msg1 = nickname .. saltHash1
  199.     local msg2 = nickname .. saltHash2
  200.     local hash1number = LibDeflate:Crc32(msg1, 0)
  201.     local hash2number = LibDeflate:Crc32(msg2, 0)
  202.     -- Берем младшие 6 чисел каждого хеша
  203.     local hash1 = hash1number % 1000000
  204.     local hash2 = hash2number % 1000000
  205.     return hash1, hash2
  206. end
  207.  
  208. local hash, prevHash = getHashes(nickname, hours, minutes, secretSalt)
  209. print(hash, prevHash)
  210. minutes = minutes + 1
  211. hash, prevHash = getHashes(nickname, hours, minutes, secretSalt)
  212. print(hash, prevHash)
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