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@tomciopp tomciopp/README.txt
Created Nov 25, 2018

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Pure Elixir/Erlang CRC32C implementations
I have tested the elixir version and it works, but have not tested the erlang version of this code.
-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))).
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
@eugenehr

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eugenehr commented Mar 16, 2019

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))).
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