def test_crcmod_c8d64_random(self):
data = NumberMask(random.randint(1, 0xFFFFFFFFFFFFFFFF), 64)
crcSize = 8
crcMax = 2**8 - 1
inputPoly = NumberMask(0x100 | random.randint(1, crcMax), crcSize)
## 'regInit' and 'xorOut' are not incompatible
regInit = 0x0
xorOut = 0x0
reverse = bool(random.randint(0, 1))
crc_func = crcmod.mkCrcFun(inputPoly.masterData(),
rev=reverse,
initCrc=regInit,
xorOut=xorOut)
crcLib = crc_func(data.toASCII())
# print "crc: {:X} {:X}".format( crc, crc2 )
crcProc = DivisionCRC()
crcProc.setReversed(reverse)
crcProc.setXorOutValue(xorOut)
crcProc.setRegisterInitValue(regInit)
# crcProc.setInitCRC( regInit )
if reverse:
data.reorderBytes()
inputPoly.reverse()
crc = crcProc.calculate3(data, inputPoly)
# print "values: {} poly:{:X} init:{:X} xorOut:{:08b} rev:{} crc:{:08b} crcmod:{:08b} crcxor:{:08b}".format( data, inputPoly, regInit, xorOut, reverse, crc, crcLib, crc^crcLib )
self.assertEqual(crc, crcLib)
def test_crcmod_c8d16_rev(self):
data = NumberMask(0xE3F2, 16)
inputPoly = NumberMask(0x1F0, 8)
regInit = 0x0
xorOut = 0x0
reverse = True
crc_func = crcmod.mkCrcFun(inputPoly.masterData(),
rev=reverse,
initCrc=regInit,
xorOut=xorOut)
crcLib = crc_func(data.toASCII())
# print "crc: {:X} {:X}".format( crc, crc2 )
crcProc = DivisionCRC()
crcProc.setReversed(reverse)
crcProc.setXorOutValue(xorOut)
crcProc.setRegisterInitValue(regInit)
data.reorderBytes()
inputPoly.reverse()
crc = crcProc.calculate3(data, inputPoly)
# print "values: {} poly:{:X} init:{:X} xorOut:{:08b} rev:{} crc:{:08b} crcmod:{:08b} crcxor:{:08b}".format( data, inputPoly, regInit, xorOut, reverse, crc, crcLib, crc^crcLib )
self.assertEqual(crc, crcLib)
def checkCRC(self, dataMask, crcMask, crcKey, retList):
## dataMask: NumberMask
## crcMask: NumberMask
## crcKey: CRCKey
##print "Checking data:", dataMask, crc, crcMaskKey
crcSize = crcMask.dataSize
crc_forward = self.procFactory.createForwardProcessor(crcSize)
crc_forward.setValues(crcKey)
polyMask = NumberMask(crcKey.poly, crcSize)
polyCRC = crc_forward.calculate3(dataMask, polyMask)
if polyCRC == crcMask.dataNum:
retList.add(crcKey)
## we assume that if key was found then testing on reversed input will fail
return
if crcKey.isReversedFully() is False:
return
#TODO: try to achieve compatibility without reversing
## check reversed input (crcmod compatibility)
crc_forward.setInitCRC(crcKey.init, crcSize)
revDataMask = dataMask.reorderedBytes()
polyMask.reverse()
polyCRC = crc_forward.calculate3(revDataMask, polyMask)
if polyCRC == crcMask.dataNum:
retList.add(crcKey)
def test_crcmod_c16d64_random(self):
data = NumberMask(random.randint(1, 0xFFFFFFFFFFFFFFFF), 64)
crcSize = 16
crcMax = 2**crcSize - 1
inputPoly = NumberMask((0x1 << crcSize) | random.randint(1, crcMax),
crcSize)
# regInit = random.randint(0, crcMax)
# xorOut = random.randint(0, crcMax)
regInit = 0x0
xorOut = 0x0
reverse = bool(random.randint(0, 1))
crc_func = crcmod.mkCrcFun(inputPoly.masterData(),
rev=reverse,
initCrc=regInit,
xorOut=xorOut)
crcLib = crc_func(data.toASCII())
# print "crc: {:X} {:X}".format( crc, crc2 )
crcProc = HwCRC()
crcProc.setReversed(reverse)
crcProc.setXorOutValue(xorOut)
if reverse:
data.reorderBytes()
inputPoly.reverse()
crcInit = reverse_number(regInit ^ xorOut, crcSize)
crcProc.setRegisterInitValue(crcInit)
else:
crcInit = regInit ^ xorOut
crcProc.setRegisterInitValue(crcInit)
crc = crcProc.calculate3(data, inputPoly)
# print "values: {} poly:{:X} init:{:X} xorOut:{:08b} rev:{} crc:{:08b} crcmod:{:08b} crcxor:{:08b}".format( data, inputPoly, regInit, xorOut, reverse, crc, crcLib, crc^crcLib )
self.assertEqual(crc, crcLib)