1  
   2  #!/usr/bin/env python
   3  
   4  __author__="Andrew Pennebaker (andrew.pennebaker@gmail.com)"
   5  __date__="21 Dec 2005 - 17 Jul 2006"
   6  __copyright__="Copyright 2006 Andrew Pennebaker"
   7  __license__="GPL"
   8  __version__="0.4"
   9  __URL__="http://snippets.dzone.com/posts/show/3544"
  10  
  11  import HashFunction
  12  
  13  class CRC16(HashFunction.HashFunction):
  14  	BLOCK_SIZE=1
  15  	DIGEST_SIZE=2
  16  
  17  	INIT=0x0000
  18  	SUM_REQ="Sum >= 0"
  19  
  20  	TEST_DATA="abc"
  21  	TEST_HASH=0xa8b6
  22  
  23  	TABLE=[
  24  		0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
  25  		0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
  26  		0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
  27  		0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
  28  		0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
  29  		0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
  30  		0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
  31  		0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
  32  		0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
  33  		0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
  34  		0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
  35  		0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
  36  		0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
  37  		0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
  38  		0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
  39  		0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
  40  		0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
  41  		0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
  42  		0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
  43  		0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
  44  		0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
  45  		0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
  46  		0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
  47  		0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
  48  		0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
  49  		0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
  50  		0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
  51  		0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
  52  		0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
  53  		0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
  54  		0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
  55  		0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040
  56  	]
  57  
  58  	def __init__(self, sum=0x0000):
  59  		self.sum=sum^0xffff
  60  
  61  	def sumValid(self, sum):
  62  		return sum>=0
  63  
  64  	def _update(self, b):
  65  		self.sum=(self.sum>>8)^self.TABLE[(self.sum^(b&0xff))&0xff]
  66  
  67  	def digest(self):
  68  		return self.sum^0xffff
  69  
  70  	def format(self, data):
  71  		return "%02x" % (data)
  72  
  73  	def unformat(self, hash):
  74  		return int(hash, 16)
  75  
  76  if __name__=="__main__":
  77  	HashFunction.main(CRC16)

   1  
   2  #!/usr/bin/env python
   3  
   4  __author__="Andrew Pennebaker (andrew.pennebaker@gmail.com)"
   5  __date__="23 Dec 2005 - 17 Jul 2006"
   6  __copyright__="Copyright 2006 Andrew Pennebaker"
   7  __license__="GPL"
   8  __version__="0.3"
   9  __credits__="From the PyPy project"
  10  __URL__="http://snippets.dzone.com/posts/show/3543"
  11  
  12  import HashFunction
  13  
  14  class CRC8(HashFunction.HashFunction):
  15  	BLOCK_SIZE=1
  16  	DIGEST_SIZE=1
  17  
  18  	INIT=0x00
  19  	SUM_REQ="Sum >= 0"
  20  
  21  	TEST_DATA="abc"
  22  	TEST_HASH=0x8b
  23  
  24  	TABLE=[
  25  		0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
  26  		0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
  27  		0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
  28  		0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
  29  		0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
  30  		0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
  31  		0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
  32  		0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
  33  		0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
  34  		0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
  35  		0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
  36  		0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
  37  		0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
  38  		0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
  39  		0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
  40  		0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
  41  		0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
  42  		0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
  43  		0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
  44  		0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
  45  		0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
  46  		0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
  47  		0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
  48  		0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
  49  		0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
  50  		0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
  51  		0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
  52  		0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
  53  		0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
  54  		0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
  55  		0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
  56  		0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
  57  	]
  58  
  59  	def __init__(self, sum=0x00):
  60  		self.sum=sum^0xff
  61  
  62  	def sumValid(self, sum):
  63  		return sum>=0
  64  
  65  	def _update(self, b):
  66  		self.sum=self.TABLE[self.sum^b]
  67  
  68  	def digest(self):
  69  		return self.sum^0xff
  70  
  71  	def format(self, data):
  72  		return "%02x" % (data)
  73  
  74  	def unformat(self, hash):
  75  		return int(hash, 16)
  76  
  77  if __name__=="__main__":
  78  	HashFunction.main(CRC8)

   1  
   2  #!/usr/bin/env python
   3  
   4  __author__="Andrew Pennebaker (andrew.pennebaker@gmail.com)"
   5  __date__="10 Oct 2005 - 17 Jul 2006"
   6  __copyright__="Copyright 2006 Andrew Pennebaker"
   7  __license__="GPL"
   8  __version__="0.4"
   9  __credits__="From the PyPy project"
  10  __URL__="http://snippets.dzone.com/posts/show/3540"
  11  
  12  import HashFunction
  13  
  14  class CRC32(HashFunction.HashFunction):
  15  	BLOCK_SIZE=1
  16  	DIGEST_SIZE=4
  17  
  18  	INIT=0x00000000
  19  	SUM_REQ="Sum >= 0"
  20  
  21  	TEST_DATA="abc"
  22  	TEST_HASH=0x352441c2
  23  
  24  	TABLE=[
  25  		0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
  26  		0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
  27  		0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  28  		0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
  29  		0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  30  		0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  31  		0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
  32  		0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
  33  		0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  34  		0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  35  		0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
  36  		0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  37  		0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
  38  		0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
  39  		0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  40  		0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
  41  		0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
  42  		0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  43  		0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
  44  		0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  45  		0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  46  		0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
  47  		0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
  48  		0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  49  		0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  50  		0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
  51  		0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  52  		0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
  53  		0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
  54  		0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  55  		0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
  56  		0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
  57  		0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  58  		0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
  59  		0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  60  		0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  61  		0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
  62  		0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
  63  		0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  64  		0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  65  		0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
  66  		0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  67  		0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
  68  		0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
  69  		0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  70  		0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
  71  		0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
  72  		0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  73  		0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
  74  		0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  75  		0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  76  		0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
  77  		0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
  78  		0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  79  		0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  80  		0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
  81  		0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  82  		0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
  83  		0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
  84  		0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  85  		0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
  86  		0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
  87  		0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  88  		0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
  89  	]
  90  
  91  	def __init__(self, sum=0x00000000):
  92  		self.sum=sum^0xffffffff
  93  
  94  	def sumValid(self, sum):
  95  		return sum>=0
  96  
  97  	def _update(self, b):
  98  		self.sum=self.TABLE[(self.sum^b)&0xff]^(self.sum>>8)
  99  
 100  	def digest(self):
 101  		return self.sum^0xffffffff
 102  
 103  	def format(self, data):
 104  		return "%02x" % (data)
 105  
 106  	def unformat(self, hash):
 107  		return long(hash, 16)
 108  
 109  if __name__=="__main__":
 110  	HashFunction.main(CRC32)