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46 lines
1.0 KiB
Python
46 lines
1.0 KiB
Python
import sys, binascii
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letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789"
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def crc32(s):
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return (~binascii.crc32(s,-1))&0xFFFFFFFF
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def checksumPid(s):
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crc = crc32(s)
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crc = crc ^ (crc >> 16)
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res = s
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l = len(letters)
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for i in (0,1):
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b = crc & 0xff
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pos = (b // l) ^ (b % l)
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res += letters[pos%l]
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crc >>= 8
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return res
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def pidFromSerial(s, l):
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crc = crc32(s)
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arr1 = [0]*l
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for i in xrange(len(s)):
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arr1[i%l] ^= ord(s[i])
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crc_bytes = [crc >> 24 & 0xff, crc >> 16 & 0xff, crc >> 8 & 0xff, crc & 0xff]
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for i in xrange(l):
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arr1[i] ^= crc_bytes[i&3]
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pid = ""
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for i in xrange(l):
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b = arr1[i] & 0xff
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pid+=letters[(b >> 7) + ((b >> 5 & 3) ^ (b & 0x1f))]
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return pid
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print "Mobipocket PID calculator for Amazon Kindle. Copyright (c) 2007 Igor Skochinsky <skochinsky@mail.ru>"
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if len(sys.argv)>1:
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pid = pidFromSerial(sys.argv[1],7)+"*"
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print "Mobipocked PID for Kindle serial# "+sys.argv[1]+" is "+checksumPid(pid)
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else:
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print "Usage: kindlepid.py <Kindle Serial Number>"
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