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fix hash check computation and op offset

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bunnie 2022-10-08 02:26:00 +08:00
parent df12dcdd1e
commit 44d3c19733
1 changed files with 5 additions and 0 deletions
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5
tools/backalyzer.py
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@ -186,6 +186,7 @@ def main():
i += 4
header_total_size = int.from_bytes(pt_data[i:i+4], 'little')
logging.info("Header total length in bytes: {}".format(header_total_size))
i += 4
i += 36 # reserved
op = int.from_bytes(pt_data[i:i+4], 'little')
logging.info("Stored Backup Opcode: {}".format(op))
@ -194,6 +195,10 @@ def main():
if backup_version == 0x10001:
logging.info("Doing hash verification of pt+ct metadata")
hasher = SHA512.new(truncate="256")
check_region = bytearray(check_region)
# patch the backup opcode back to the one used to compute the checksum, because the version
# written to disk had the opcode manipulated to "2" which instructs the system to do a restore
check_region[140:144] = [0, 0, 0, 0]
hasher.update(check_region)
computed_checksum = hasher.digest()
if computed_checksum != checksum: