Pure Elixir/Erlang CRC32C implementations

README.txt

I have tested the elixir version and it works, but have not tested the erlang version of this code. 

cyclic_redundancy_check.erl

-module(cyclic_redundancy_check).

-export([crc32c/1])

-define(CRC32C_TABLE, {
  16#00000000, 16#F26B8303, 16#E13B70F7, 16#1350F3F4,
  16#C79A971F, 16#35F1141C, 16#26A1E7E8, 16#D4CA64EB,
  16#8AD958CF, 16#78B2DBCC, 16#6BE22838, 16#9989AB3B,
  16#4D43CFD0, 16#BF284CD3, 16#AC78BF27, 16#5E133C24,
  16#105EC76F, 16#E235446C, 16#F165B798, 16#030E349B,
  16#D7C45070, 16#25AFD373, 16#36FF2087, 16#C494A384,
  16#9A879FA0, 16#68EC1CA3, 16#7BBCEF57, 16#89D76C54,
  16#5D1D08BF, 16#AF768BBC, 16#BC267848, 16#4E4DFB4B,
  16#20BD8EDE, 16#D2D60DDD, 16#C186FE29, 16#33ED7D2A,
  16#E72719C1, 16#154C9AC2, 16#061C6936, 16#F477EA35,
  16#AA64D611, 16#580F5512, 16#4B5FA6E6, 16#B93425E5,
  16#6DFE410E, 16#9F95C20D, 16#8CC531F9, 16#7EAEB2FA,
  16#30E349B1, 16#C288CAB2, 16#D1D83946, 16#23B3BA45,
  16#F779DEAE, 16#05125DAD, 16#1642AE59, 16#E4292D5A,
  16#BA3A117E, 16#4851927D, 16#5B016189, 16#A96AE28A,
  16#7DA08661, 16#8FCB0562, 16#9C9BF696, 16#6EF07595,
  16#417B1DBC, 16#B3109EBF, 16#A0406D4B, 16#522BEE48,
  16#86E18AA3, 16#748A09A0, 16#67DAFA54, 16#95B17957,
  16#CBA24573, 16#39C9C670, 16#2A993584, 16#D8F2B687,
  16#0C38D26C, 16#FE53516F, 16#ED03A29B, 16#1F682198,
  16#5125DAD3, 16#A34E59D0, 16#B01EAA24, 16#42752927,
  16#96BF4DCC, 16#64D4CECF, 16#77843D3B, 16#85EFBE38,
  16#DBFC821C, 16#2997011F, 16#3AC7F2EB, 16#C8AC71E8,
  16#1C661503, 16#EE0D9600, 16#FD5D65F4, 16#0F36E6F7,
  16#61C69362, 16#93AD1061, 16#80FDE395, 16#72966096,
  16#A65C047D, 16#5437877E, 16#4767748A, 16#B50CF789,
  16#EB1FCBAD, 16#197448AE, 16#0A24BB5A, 16#F84F3859,
  16#2C855CB2, 16#DEEEDFB1, 16#CDBE2C45, 16#3FD5AF46,
  16#7198540D, 16#83F3D70E, 16#90A324FA, 16#62C8A7F9,
  16#B602C312, 16#44694011, 16#5739B3E5, 16#A55230E6,
  16#FB410CC2, 16#092A8FC1, 16#1A7A7C35, 16#E811FF36,
  16#3CDB9BDD, 16#CEB018DE, 16#DDE0EB2A, 16#2F8B6829,
  16#82F63B78, 16#709DB87B, 16#63CD4B8F, 16#91A6C88C,
  16#456CAC67, 16#B7072F64, 16#A457DC90, 16#563C5F93,
  16#082F63B7, 16#FA44E0B4, 16#E9141340, 16#1B7F9043,
  16#CFB5F4A8, 16#3DDE77AB, 16#2E8E845F, 16#DCE5075C,
  16#92A8FC17, 16#60C37F14, 16#73938CE0, 16#81F80FE3,
  16#55326B08, 16#A759E80B, 16#B4091BFF, 16#466298FC,
  16#1871A4D8, 16#EA1A27DB, 16#F94AD42F, 16#0B21572C,
  16#DFEB33C7, 16#2D80B0C4, 16#3ED04330, 16#CCBBC033,
  16#A24BB5A6, 16#502036A5, 16#4370C551, 16#B11B4652,
  16#65D122B9, 16#97BAA1BA, 16#84EA524E, 16#7681D14D,
  16#2892ED69, 16#DAF96E6A, 16#C9A99D9E, 16#3BC21E9D,
  16#EF087A76, 16#1D63F975, 16#0E330A81, 16#FC588982,
  16#B21572C9, 16#407EF1CA, 16#532E023E, 16#A145813D,
  16#758FE5D6, 16#87E466D5, 16#94B49521, 16#66DF1622,
  16#38CC2A06, 16#CAA7A905, 16#D9F75AF1, 16#2B9CD9F2,
  16#FF56BD19, 16#0D3D3E1A, 16#1E6DCDEE, 16#EC064EED,
  16#C38D26C4, 16#31E6A5C7, 16#22B65633, 16#D0DDD530,
  16#0417B1DB, 16#F67C32D8, 16#E52CC12C, 16#1747422F,
  16#49547E0B, 16#BB3FFD08, 16#A86F0EFC, 16#5A048DFF,
  16#8ECEE914, 16#7CA56A17, 16#6FF599E3, 16#9D9E1AE0,
  16#D3D3E1AB, 16#21B862A8, 16#32E8915C, 16#C083125F,
  16#144976B4, 16#E622F5B7, 16#F5720643, 16#07198540,
  16#590AB964, 16#AB613A67, 16#B831C993, 16#4A5A4A90,
  16#9E902E7B, 16#6CFBAD78, 16#7FAB5E8C, 16#8DC0DD8F,
  16#E330A81A, 16#115B2B19, 16#020BD8ED, 16#F0605BEE,
  16#24AA3F05, 16#D6C1BC06, 16#C5914FF2, 16#37FACCF1,
  16#69E9F0D5, 16#9B8273D6, 16#88D28022, 16#7AB90321,
  16#AE7367CA, 16#5C18E4C9, 16#4F48173D, 16#BD23943E,
  16#F36E6F75, 16#0105EC76, 16#12551F82, 16#E03E9C81,
  16#34F4F86A, 16#C69F7B69, 16#D5CF889D, 16#27A40B9E,
  16#79B737BA, 16#8BDCB4B9, 16#988C474D, 16#6AE7C44E,
  16#BE2DA0A5, 16#4C4623A6, 16#5F16D052, 16#AD7D5351
})

crc32c(data) -> crc32c(data, 16#FFFFFFFF).

crc32c(<<>>, acc) -> bxor(acc, 16#FFFFFFFF);

crc32c(<<Current:1/binary, Rest/binary>>, acc) -> 
  Index = band(bxor(acc, Current), 16#FF) + 1,
  crc32c(Rest, bxor(bsr(acc, 8), element(Index, ?CRC32C_TABLE))).

cyclic_redundancy_check.ex

defmodule CyclicRedundancyCheck do
  use Bitwise 

  @lookup_table [
    0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
    0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
    0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
    0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
    0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
    0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
    0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
    0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
    0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
    0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
    0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
    0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
    0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
    0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
    0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
    0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
    0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
    0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
    0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
    0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
    0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
    0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
    0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
    0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
    0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
    0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
    0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
    0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
    0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
    0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
    0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
    0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
    0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
    0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
    0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
    0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
    0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
    0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
    0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
    0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
    0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
    0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
    0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
    0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
    0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
    0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
    0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
    0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
    0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
    0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
    0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
    0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
    0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
    0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
    0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
    0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
    0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
    0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
    0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
    0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
    0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
    0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
    0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
    0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351
  ]

  def crc32c(data), do: crc32c(data, 0xFFFFFFFF)
  def crc32c(<<>>, acc), do: bxor(acc, 0xFFFFFFFF)

  def crc32c(<<current :: size(8), data :: binary>>, acc) do
    index = acc |> bxor(current) |> band(0xFF)
    crc32c(data, bxor(bsr(acc, 8), Enum.at(@lookup_table, index)))
  end
end

Erlang version works with small fixes:

crc32c(Data) when is_binary(Data) -> 
    crc32c(Data, 16#FFFFFFFF).

crc32c(<<>>, Acc) -> 
    Acc bxor 16#FFFFFFFF;

crc32c(<<Current:8, Rest/binary>>, Acc) -> 
    Index = ((Acc bxor Current) band 16#FF) + 1,
    crc32c(Rest, ((Acc bsr 8) bxor element(Index, ?CRC32C_TABLE))).

Thanks for posting this! Just a tip, you can improve performance of the elixir implementation by replacing the Enum.at and lookup table with a function call using pattern matching like this:

 defp get_polynomial(0), do: 0x00000000
  defp get_polynomial(1), do: 0xF26B8303
  defp get_polynomial(2), do: 0xE13B70F7
  defp get_polynomial(3), do: 0x1350F3F4
  defp get_polynomial(4), do: 0xC79A971F
  defp get_polynomial(5), do: 0x35F1141C
  defp get_polynomial(6), do: 0x26A1E7E8
  defp get_polynomial(7), do: 0xD4CA64EB
  defp get_polynomial(8), do: 0x8AD958CF
  defp get_polynomial(9), do: 0x78B2DBCC
  defp get_polynomial(10), do: 0x6BE22838
  defp get_polynomial(11), do: 0x9989AB3B
  defp get_polynomial(12), do: 0x4D43CFD0
  defp get_polynomial(13), do: 0xBF284CD3
  defp get_polynomial(14), do: 0xAC78BF27
  defp get_polynomial(15), do: 0x5E133C24
  defp get_polynomial(16), do: 0x105EC76F
  defp get_polynomial(17), do: 0xE235446C
  defp get_polynomial(18), do: 0xF165B798
  defp get_polynomial(19), do: 0x030E349B
  defp get_polynomial(20), do: 0xD7C45070
  defp get_polynomial(21), do: 0x25AFD373
  defp get_polynomial(22), do: 0x36FF2087
  defp get_polynomial(23), do: 0xC494A384
  defp get_polynomial(24), do: 0x9A879FA0
  defp get_polynomial(25), do: 0x68EC1CA3
  defp get_polynomial(26), do: 0x7BBCEF57
  defp get_polynomial(27), do: 0x89D76C54
  defp get_polynomial(28), do: 0x5D1D08BF
  defp get_polynomial(29), do: 0xAF768BBC
  defp get_polynomial(30), do: 0xBC267848
  defp get_polynomial(31), do: 0x4E4DFB4B
  defp get_polynomial(32), do: 0x20BD8EDE
  defp get_polynomial(33), do: 0xD2D60DDD
  defp get_polynomial(34), do: 0xC186FE29
  defp get_polynomial(35), do: 0x33ED7D2A
  defp get_polynomial(36), do: 0xE72719C1
  defp get_polynomial(37), do: 0x154C9AC2
  defp get_polynomial(38), do: 0x061C6936
  defp get_polynomial(39), do: 0xF477EA35
  defp get_polynomial(40), do: 0xAA64D611
  defp get_polynomial(41), do: 0x580F5512
  defp get_polynomial(42), do: 0x4B5FA6E6
  defp get_polynomial(43), do: 0xB93425E5
  defp get_polynomial(44), do: 0x6DFE410E
  defp get_polynomial(45), do: 0x9F95C20D
  defp get_polynomial(46), do: 0x8CC531F9
  defp get_polynomial(47), do: 0x7EAEB2FA
  defp get_polynomial(48), do: 0x30E349B1
  defp get_polynomial(49), do: 0xC288CAB2
  defp get_polynomial(50), do: 0xD1D83946
  defp get_polynomial(51), do: 0x23B3BA45
  defp get_polynomial(52), do: 0xF779DEAE
  defp get_polynomial(53), do: 0x05125DAD
  defp get_polynomial(54), do: 0x1642AE59
  defp get_polynomial(55), do: 0xE4292D5A
  defp get_polynomial(56), do: 0xBA3A117E
  defp get_polynomial(57), do: 0x4851927D
  defp get_polynomial(58), do: 0x5B016189
  defp get_polynomial(59), do: 0xA96AE28A
  defp get_polynomial(60), do: 0x7DA08661
  defp get_polynomial(61), do: 0x8FCB0562
  defp get_polynomial(62), do: 0x9C9BF696
  defp get_polynomial(63), do: 0x6EF07595
  defp get_polynomial(64), do: 0x417B1DBC
  defp get_polynomial(65), do: 0xB3109EBF
  defp get_polynomial(66), do: 0xA0406D4B
  defp get_polynomial(67), do: 0x522BEE48
  defp get_polynomial(68), do: 0x86E18AA3
  defp get_polynomial(69), do: 0x748A09A0
  defp get_polynomial(70), do: 0x67DAFA54
  defp get_polynomial(71), do: 0x95B17957
  defp get_polynomial(72), do: 0xCBA24573
  defp get_polynomial(73), do: 0x39C9C670
  defp get_polynomial(74), do: 0x2A993584
  defp get_polynomial(75), do: 0xD8F2B687
  defp get_polynomial(76), do: 0x0C38D26C
  defp get_polynomial(77), do: 0xFE53516F
  defp get_polynomial(78), do: 0xED03A29B
  defp get_polynomial(79), do: 0x1F682198
  defp get_polynomial(80), do: 0x5125DAD3
  defp get_polynomial(81), do: 0xA34E59D0
  defp get_polynomial(82), do: 0xB01EAA24
  defp get_polynomial(83), do: 0x42752927
  defp get_polynomial(84), do: 0x96BF4DCC
  defp get_polynomial(85), do: 0x64D4CECF
  defp get_polynomial(86), do: 0x77843D3B
  defp get_polynomial(87), do: 0x85EFBE38
  defp get_polynomial(88), do: 0xDBFC821C
  defp get_polynomial(89), do: 0x2997011F
  defp get_polynomial(90), do: 0x3AC7F2EB
  defp get_polynomial(91), do: 0xC8AC71E8
  defp get_polynomial(92), do: 0x1C661503
  defp get_polynomial(93), do: 0xEE0D9600
  defp get_polynomial(94), do: 0xFD5D65F4
  defp get_polynomial(95), do: 0x0F36E6F7
  defp get_polynomial(96), do: 0x61C69362
  defp get_polynomial(97), do: 0x93AD1061
  defp get_polynomial(98), do: 0x80FDE395
  defp get_polynomial(99), do: 0x72966096
  defp get_polynomial(100), do: 0xA65C047D
  defp get_polynomial(101), do: 0x5437877E
  defp get_polynomial(102), do: 0x4767748A
  defp get_polynomial(103), do: 0xB50CF789
  defp get_polynomial(104), do: 0xEB1FCBAD
  defp get_polynomial(105), do: 0x197448AE
  defp get_polynomial(106), do: 0x0A24BB5A
  defp get_polynomial(107), do: 0xF84F3859
  defp get_polynomial(108), do: 0x2C855CB2
  defp get_polynomial(109), do: 0xDEEEDFB1
  defp get_polynomial(110), do: 0xCDBE2C45
  defp get_polynomial(111), do: 0x3FD5AF46
  defp get_polynomial(112), do: 0x7198540D
  defp get_polynomial(113), do: 0x83F3D70E
  defp get_polynomial(114), do: 0x90A324FA
  defp get_polynomial(115), do: 0x62C8A7F9
  defp get_polynomial(116), do: 0xB602C312
  defp get_polynomial(117), do: 0x44694011
  defp get_polynomial(118), do: 0x5739B3E5
  defp get_polynomial(119), do: 0xA55230E6
  defp get_polynomial(120), do: 0xFB410CC2
  defp get_polynomial(121), do: 0x092A8FC1
  defp get_polynomial(122), do: 0x1A7A7C35
  defp get_polynomial(123), do: 0xE811FF36
  defp get_polynomial(124), do: 0x3CDB9BDD
  defp get_polynomial(125), do: 0xCEB018DE
  defp get_polynomial(126), do: 0xDDE0EB2A
  defp get_polynomial(127), do: 0x2F8B6829
  defp get_polynomial(128), do: 0x82F63B78
  defp get_polynomial(129), do: 0x709DB87B
  defp get_polynomial(130), do: 0x63CD4B8F
  defp get_polynomial(131), do: 0x91A6C88C
  defp get_polynomial(132), do: 0x456CAC67
  defp get_polynomial(133), do: 0xB7072F64
  defp get_polynomial(134), do: 0xA457DC90
  defp get_polynomial(135), do: 0x563C5F93
  defp get_polynomial(136), do: 0x082F63B7
  defp get_polynomial(137), do: 0xFA44E0B4
  defp get_polynomial(138), do: 0xE9141340
  defp get_polynomial(139), do: 0x1B7F9043
  defp get_polynomial(140), do: 0xCFB5F4A8
  defp get_polynomial(141), do: 0x3DDE77AB
  defp get_polynomial(142), do: 0x2E8E845F
  defp get_polynomial(143), do: 0xDCE5075C
  defp get_polynomial(144), do: 0x92A8FC17
  defp get_polynomial(145), do: 0x60C37F14
  defp get_polynomial(146), do: 0x73938CE0
  defp get_polynomial(147), do: 0x81F80FE3
  defp get_polynomial(148), do: 0x55326B08
  defp get_polynomial(149), do: 0xA759E80B
  defp get_polynomial(150), do: 0xB4091BFF
  defp get_polynomial(151), do: 0x466298FC
  defp get_polynomial(152), do: 0x1871A4D8
  defp get_polynomial(153), do: 0xEA1A27DB
  defp get_polynomial(154), do: 0xF94AD42F
  defp get_polynomial(155), do: 0x0B21572C
  defp get_polynomial(156), do: 0xDFEB33C7
  defp get_polynomial(157), do: 0x2D80B0C4
  defp get_polynomial(158), do: 0x3ED04330
  defp get_polynomial(159), do: 0xCCBBC033
  defp get_polynomial(160), do: 0xA24BB5A6
  defp get_polynomial(161), do: 0x502036A5
  defp get_polynomial(162), do: 0x4370C551
  defp get_polynomial(163), do: 0xB11B4652
  defp get_polynomial(164), do: 0x65D122B9
  defp get_polynomial(165), do: 0x97BAA1BA
  defp get_polynomial(166), do: 0x84EA524E
  defp get_polynomial(167), do: 0x7681D14D
  defp get_polynomial(168), do: 0x2892ED69
  defp get_polynomial(169), do: 0xDAF96E6A
  defp get_polynomial(170), do: 0xC9A99D9E
  defp get_polynomial(171), do: 0x3BC21E9D
  defp get_polynomial(172), do: 0xEF087A76
  defp get_polynomial(173), do: 0x1D63F975
  defp get_polynomial(174), do: 0x0E330A81
  defp get_polynomial(175), do: 0xFC588982
  defp get_polynomial(176), do: 0xB21572C9
  defp get_polynomial(177), do: 0x407EF1CA
  defp get_polynomial(178), do: 0x532E023E
  defp get_polynomial(179), do: 0xA145813D
  defp get_polynomial(180), do: 0x758FE5D6
  defp get_polynomial(181), do: 0x87E466D5
  defp get_polynomial(182), do: 0x94B49521
  defp get_polynomial(183), do: 0x66DF1622
  defp get_polynomial(184), do: 0x38CC2A06
  defp get_polynomial(185), do: 0xCAA7A905
  defp get_polynomial(186), do: 0xD9F75AF1
  defp get_polynomial(187), do: 0x2B9CD9F2
  defp get_polynomial(188), do: 0xFF56BD19
  defp get_polynomial(189), do: 0x0D3D3E1A
  defp get_polynomial(190), do: 0x1E6DCDEE
  defp get_polynomial(191), do: 0xEC064EED
  defp get_polynomial(192), do: 0xC38D26C4
  defp get_polynomial(193), do: 0x31E6A5C7
  defp get_polynomial(194), do: 0x22B65633
  defp get_polynomial(195), do: 0xD0DDD530
  defp get_polynomial(196), do: 0x0417B1DB
  defp get_polynomial(197), do: 0xF67C32D8
  defp get_polynomial(198), do: 0xE52CC12C
  defp get_polynomial(199), do: 0x1747422F
  defp get_polynomial(200), do: 0x49547E0B
  defp get_polynomial(201), do: 0xBB3FFD08
  defp get_polynomial(202), do: 0xA86F0EFC
  defp get_polynomial(203), do: 0x5A048DFF
  defp get_polynomial(204), do: 0x8ECEE914
  defp get_polynomial(205), do: 0x7CA56A17
  defp get_polynomial(206), do: 0x6FF599E3
  defp get_polynomial(207), do: 0x9D9E1AE0
  defp get_polynomial(208), do: 0xD3D3E1AB
  defp get_polynomial(209), do: 0x21B862A8
  defp get_polynomial(210), do: 0x32E8915C
  defp get_polynomial(211), do: 0xC083125F
  defp get_polynomial(212), do: 0x144976B4
  defp get_polynomial(213), do: 0xE622F5B7
  defp get_polynomial(214), do: 0xF5720643
  defp get_polynomial(215), do: 0x07198540
  defp get_polynomial(216), do: 0x590AB964
  defp get_polynomial(217), do: 0xAB613A67
  defp get_polynomial(218), do: 0xB831C993
  defp get_polynomial(219), do: 0x4A5A4A90
  defp get_polynomial(220), do: 0x9E902E7B
  defp get_polynomial(221), do: 0x6CFBAD78
  defp get_polynomial(222), do: 0x7FAB5E8C
  defp get_polynomial(223), do: 0x8DC0DD8F
  defp get_polynomial(224), do: 0xE330A81A
  defp get_polynomial(225), do: 0x115B2B19
  defp get_polynomial(226), do: 0x020BD8ED
  defp get_polynomial(227), do: 0xF0605BEE
  defp get_polynomial(228), do: 0x24AA3F05
  defp get_polynomial(229), do: 0xD6C1BC06
  defp get_polynomial(230), do: 0xC5914FF2
  defp get_polynomial(231), do: 0x37FACCF1
  defp get_polynomial(232), do: 0x69E9F0D5
  defp get_polynomial(233), do: 0x9B8273D6
  defp get_polynomial(234), do: 0x88D28022
  defp get_polynomial(235), do: 0x7AB90321
  defp get_polynomial(236), do: 0xAE7367CA
  defp get_polynomial(237), do: 0x5C18E4C9
  defp get_polynomial(238), do: 0x4F48173D
  defp get_polynomial(239), do: 0xBD23943E
  defp get_polynomial(240), do: 0xF36E6F75
  defp get_polynomial(241), do: 0x0105EC76
  defp get_polynomial(242), do: 0x12551F82
  defp get_polynomial(243), do: 0xE03E9C81
  defp get_polynomial(244), do: 0x34F4F86A
  defp get_polynomial(245), do: 0xC69F7B69
  defp get_polynomial(246), do: 0xD5CF889D
  defp get_polynomial(247), do: 0x27A40B9E
  defp get_polynomial(248), do: 0x79B737BA
  defp get_polynomial(249), do: 0x8BDCB4B9
  defp get_polynomial(250), do: 0x988C474D
  defp get_polynomial(251), do: 0x6AE7C44E
  defp get_polynomial(252), do: 0xBE2DA0A5
  defp get_polynomial(253), do: 0x4C4623A6
  defp get_polynomial(254), do: 0x5F16D052
  defp get_polynomial(255), do: 0xAD7D5351

A simple benchee benchmark gave me results 15x faster using this approach.

    input = :rand.bytes(1024)

    Benchee.run(
      %{
        "function" => fn -> KlifeProtocol.CRC32c.execute(input) end,
        "enum.at" => fn -> BenchCRC.crc32c(input) end
      },
      time: 10,
      memory_time: 2
    )

Results:

Name               ips        average  deviation         median         99th %
function       53.20 K       18.80 μs    ±14.65%       18.58 μs       20.77 μs
enum.at         3.53 K      283.17 μs     ±9.21%      274.36 μs      362.47 μs

Comparison: 
function       53.20 K
enum.at         3.53 K - 15.06x slower +264.38 μs

Memory usage statistics:

Name        Memory usage
function       0.0391 KB
enum.at         16.04 KB - 410.60x memory usage +16 KB