krot

CRC-32

Aug 26th, 2016
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  1. #include <stddef.h>
  2. #include <stdint.h>
  3.  
  4. /*
  5.   Name  : CRC-32
  6.   Poly  : 0x04C11DB7    x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11
  7.                        + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
  8.   Init  : 0xFFFFFFFF
  9.   Revert: true
  10.   XorOut: 0xFFFFFFFF
  11.   Check : 0xCBF43926 ("123456789")
  12.   MaxLen: 268 435 455 байт (2 147 483 647 бит) - обнаружение
  13.    одинарных, двойных, пакетных и всех нечетных ошибок
  14. */
  15.  
  16. const uint_least32_t Crc32Table[256] = {
  17.     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
  18.     0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
  19.     0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  20.     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
  21.     0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
  22.     0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  23.     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
  24.     0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
  25.     0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  26.     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
  27.     0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
  28.     0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  29.     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
  30.     0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
  31.     0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  32.     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
  33.     0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
  34.     0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  35.     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
  36.     0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
  37.     0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  38.     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
  39.     0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
  40.     0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  41.     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
  42.     0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
  43.     0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  44.     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
  45.     0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
  46.     0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  47.     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
  48.     0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
  49.     0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  50.     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
  51.     0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
  52.     0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  53.     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
  54.     0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
  55.     0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  56.     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
  57.     0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
  58.     0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  59.     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
  60.     0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
  61.     0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  62.     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
  63.     0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
  64.     0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  65.     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
  66.     0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
  67.     0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  68.     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
  69.     0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
  70.     0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  71.     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
  72.     0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
  73.     0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
  74.     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
  75.     0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
  76.     0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
  77.     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
  78.     0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
  79.     0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
  80.     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
  81. };
  82.  
  83.  
  84. uint_least32_t Crc32(const unsigned char * buf, size_t len)
  85. {
  86.     uint_least32_t crc = 0xFFFFFFFF;
  87.     while (len--)
  88.         crc = (crc >> 8) ^ Crc32Table[(crc ^ *buf++) & 0xFF];
  89.     return crc ^ 0xFFFFFFFF;
  90. }
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