c_sharp_lib/1/CRC.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Security.Cryptography;

namespace UTIL
{
    #region CRC8
    public class CRC8_2
    {
        //CRC8Calc crc_dallas = new CRC8Calc(CRC8_POLY.CRC8_DALLAS_MAXIM);
        //checksum = crc_dallas.Checksum(testVal);
        //CRC8Calc crc = new CRC8Calc(CRC8_POLY.CRC8_CCITT);
        //checksum = crc.Checksum(testVal);

        public enum CRC8_POLY
        {
            CRC8 = 0xd5,
            CRC8_CCITT = 0x07,
            CRC8_DALLAS_MAXIM = 0x31,
            CRC8_SAE_J1850 = 0x1D,
            CRC_8_WCDMA = 0x9b,
        };
        private byte[] table = new byte[256];

        public byte Checksum(params byte[] val)
        {
            if (val == null)
                throw new ArgumentNullException("val");
            byte c = 0;
            foreach (byte b in val)
                c = table[c ^ b];
            return c;
        }

        public byte[] Table
        {
            get
            {
                return this.table;
            }
            set
            {
                this.table = value;
            }
        }

        public byte[] GenerateTable(CRC8_POLY polynomial)
        {
            byte[] csTable = new byte[256];
            for (int i = 0; i < 256; ++i)
            {
                int curr = i;
                for (int j = 0; j < 8; ++j)
                {
                    if ((curr & 0x80) != 0)
                        curr = (curr << 1) ^ (int)polynomial;
                    else
                        curr <<= 1;
                }
                csTable[i] = (byte)curr;
            }
            return csTable;
        }

        public CRC8_2(CRC8_POLY polynomial)
        {
            this.table = this.GenerateTable(polynomial);
        }
    }

    public static class CRC8_3
    {
        static byte[] CRC8_TABLE = new byte[]{
        0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
        157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
        35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
        190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
        70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
        219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
        101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
        248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
        140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
        17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
        175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
        50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
        202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
        87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
        233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
        116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
    };

        public static byte Calculate(byte[] data, byte init = 0)
        {
            byte result = init;
            for (var i = 0; i < data.Length; i++)
            {
                result = CRC8_TABLE[result ^ data[i]];
            }
            return result;
        }
    }
    #endregion

    #region CRC16
    public static class Crc16_1
    {
        static Byte[] auchCRCHi = new Byte[]
        {
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
            0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
            0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
            0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81,
            0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,
            0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
            0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
            0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
            0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
            0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
            0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,
            0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
            0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
            0x40
        };
        static Byte[] auchCRCLo = new Byte[]
        {
            0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4,
            0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
            0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD,
            0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
            0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7,
            0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
            0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE,
            0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
            0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2,
            0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
            0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB,
            0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
            0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90, 0x91,
            0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
            0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88,
            0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
            0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80,
            0x40
        };

        public static UInt16 CRC16(ref Byte[] d, UInt16 len)
        {
            Byte crc_hi = 0xFF;
            Byte crc_lo = 0xFF;
            Byte j = 0;
            do
            {
                Byte i = (Byte)(crc_hi ^ d[j++]);
                crc_hi = (Byte)(crc_lo ^ (Byte)auchCRCHi[i]);
                crc_lo = (Byte)(auchCRCLo[i]);
            } while (--len != 0);
            return (UInt16)((crc_hi << 8) | crc_lo);
        }
    }
    #endregion

    #region CRC32
    public static class Crc32_1
    {
        private static readonly uint[] crcTable = new uint[256];

        static Crc32_1()
        {
            const uint polynomial = 0xDEADDEAD;
            for (uint i = 0; i < 256; i++)
            {
                uint crc = i;
                for (int j = 0; j < 8; j++)
                {
                    if ((crc & 1) == 1)
                    {
                        crc = (crc >> 1) ^ polynomial;
                    }
                    else
                    {
                        crc >>= 1;
                    }
                }
                crcTable[i] = crc;
            }
        }
        public static uint Calculate(byte[] data)
        {
            uint crc = 0xFFFFFFFF;

            foreach (byte b in data)
            {
                byte tableIndex = (byte)(((crc) & 0xFF) ^ b);
                crc = crcTable[tableIndex] ^ (crc >> 8);
            }

            return ~crc;
        }
    }
    public class Crc32_2 : HashAlgorithm
    {
        public const UInt32 DefaultPolynomial = 0xedb88320;
        public const UInt32 DefaultSeed = 0xffffffff;

        private UInt32 hash;
        private UInt32 seed;
        private UInt32[] table;
        private static UInt32[] defaultTable;

        public Crc32_2()
        {
            table = InitializeTable(DefaultPolynomial);
            seed = DefaultSeed;
            Initialize();
        }

        public Crc32_2(UInt32 polynomial, UInt32 seed)
        {
            table = InitializeTable(polynomial);
            this.seed = seed;
            Initialize();
        }

        public override void Initialize()
        {
            hash = seed;
        }

        protected override void HashCore(byte[] buffer, int start, int length)
        {
            hash = CalculateHash(table, hash, buffer, start, length);
        }

        protected override byte[] HashFinal()
        {
            byte[] hashBuffer = UInt32ToBigEndianBytes(~hash);
            this.HashValue = hashBuffer;
            return hashBuffer;
        }

        public override int HashSize
        {
            get { return 32; }
        }

        public static UInt32 Compute(byte[] buffer)
        {
            return ~CalculateHash(InitializeTable(DefaultPolynomial), DefaultSeed, buffer, 0, buffer.Length);
        }

        public static UInt32 Compute(UInt32 seed, byte[] buffer)
        {
            return ~CalculateHash(InitializeTable(DefaultPolynomial), seed, buffer, 0, buffer.Length);
        }

        public static UInt32 Compute(UInt32 polynomial, UInt32 seed, byte[] buffer)
        {
            return ~CalculateHash(InitializeTable(polynomial), seed, buffer, 0, buffer.Length);
        }

        private static UInt32[] InitializeTable(UInt32 polynomial)
        {
            if (polynomial == DefaultPolynomial && defaultTable != null)
                return defaultTable;

            UInt32[] createTable = new UInt32[256];
            for (int i = 0; i < 256; i++)
            {
                UInt32 entry = (UInt32)i;
                for (int j = 0; j < 8; j++)
                    if ((entry & 1) == 1)
                        entry = (entry >> 1) ^ polynomial;
                    else
                        entry = entry >> 1;
                createTable[i] = entry;
            }

            if (polynomial == DefaultPolynomial)
                defaultTable = createTable;

            return createTable;
        }

        private static UInt32 CalculateHash(UInt32[] table, UInt32 seed, byte[] buffer, int start, int size)
        {
            UInt32 crc = seed;
            for (int i = start; i < size; i++)
                unchecked
                {
                    crc = (crc >> 8) ^ table[buffer[i] ^ crc & 0xff];
                }
            return crc;
        }

        private byte[] UInt32ToBigEndianBytes(UInt32 x)
        {
            return new byte[] {
            (byte)((x >> 24) & 0xff),
            (byte)((x >> 16) & 0xff),
            (byte)((x >> 8) & 0xff),
            (byte)(x & 0xff)
        };
        }

        public string Get(string FilePath)
        {
            Crc32_2 crc32 = new Crc32_2();
            String hash = String.Empty;

            using (FileStream fs = File.Open(FilePath, FileMode.Open))
                foreach (byte b in crc32.ComputeHash(fs)) hash += b.ToString("x2").ToLower();

            return hash;
        }
    }
    public class Crc32_3
    {
        private readonly uint[] _table;
        private const uint Poly = 0xedb88320;

        private uint ComputeChecksum(IEnumerable<byte> bytes)
        {
            var crc = 0xffffffff;
            foreach (var t in bytes)
            {
                var index = (byte)((crc & 0xff) ^ t);
                crc = (crc >> 8) ^ _table[index];
            }
            return ~crc;
        }

        public IEnumerable<byte> ComputeChecksumBytes(IEnumerable<byte> bytes)
        {
            return BitConverter.GetBytes(ComputeChecksum(bytes));
        }

        public Crc32_3()
        {
            _table = new uint[256];
            for (uint i = 0; i < _table.Length; ++i)
            {
                var temp = i;
                for (var j = 8; j > 0; --j)
                    if ((temp & 1) == 1)
                        temp = (temp >> 1) ^ Poly;
                    else
                        temp >>= 1;
                _table[i] = temp;
            }
        }
    }
    public class Crc32_4
    {
        byte[] GetCRC32(IEnumerable<byte> bytes)
        {
            var crcTable = new uint[256];
            uint crc;

            for (uint i = 0; i < 256; i++)
            {
                crc = i;
                for (uint j = 0; j < 8; j++)
                    crc = (crc & 1) != 0 ? (crc >> 1) ^ 0xEDB88320 : crc >> 1;

                crcTable[i] = crc;
            }

            crc = bytes.Aggregate(0xFFFFFFFF, (current, s) => crcTable[(current ^ s) & 0xFF] ^ (current >> 8));

            crc ^= 0xFFFFFFFF;
            return BitConverter.GetBytes(crc);
        }
    }
    #endregion
}