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Fix checksum calculation #60

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Merged
williballenthin merged 1 commit into from
Apr 13, 2016
Merged

Fix checksum calculation #60

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7 changes: 5 additions & 2 deletions Registry/RegistryParse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -301,14 +301,17 @@ def last_hbin_offset(self):
def calculate_checksum(self):
"""
checksum is calculated over the first 0x200 bytes
XOR of all D-Words from 0x00000000 to 0x000001FB
XOR of all D-Words from 0x00000000 to 0x000001FB with two edge cases.
"""
xsum = 0
idx = 0x0
# it is possible to use 0x1FC instead and expect zero for a valid hive.
while idx <= 0x1FB:
xsum ^= self.unpack_dword(idx)
idx += 0x4
if xsum == 0:
return 1
if xsum == 0xFFFFFFFF:
return 0xFFFFFFFE
return xsum

def checksum(self):
Expand Down