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trezor-firmware/legacy/script/fingerprint

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2018-06-25 16:09:52 +00:00
#!/usr/bin/env python
from __future__ import print_function
import binascii
import hashlib
def H(x):
return hashlib.sha256(x).digest()
def compute_fingerprint(x, double):
digest = H(H(x)) if double else H(x)
return binascii.hexlify(digest).decode()
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("file", type=argparse.FileType("rb"),
help="input file")
parser.add_argument("--offset", type=int, default=0,
help="skip bytes at start of input")
parser.add_argument("--max-size", type=int,
help="maximum input file size")
parser.add_argument("--double", action="store_true",
help="use SHA-256d instead of SHA-256")
args = parser.parse_args()
data = args.file.read()
size = len(data)
fingerprint = compute_fingerprint(data[args.offset:], args.double)
print("Filename :", args.file.name)
print("Fingerprint :", fingerprint)
print(f"Size : {size} bytes (out of {args.max_size} maximum)")