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37 lines
970 B
37 lines
970 B
#!/usr/bin/env python3
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import os
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import sys
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import struct
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import hashlib
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from Crypto.PublicKey import RSA
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import binascii
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# increment this to make new hardware not run old versions
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VERSION = 2
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rsa = RSA.importKey(open(sys.argv[3]).read())
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with open(sys.argv[1], "rb") as f:
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dat = f.read()
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print("signing", len(dat), "bytes")
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with open(sys.argv[2], "wb") as f:
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if os.getenv("SETLEN") is not None:
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# add the version at the end
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dat += b"VERS" + struct.pack("I", VERSION)
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# add the length at the beginning
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x = struct.pack("I", len(dat)) + dat[4:]
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# mock signature of dat[4:]
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dd = hashlib.sha1(dat[4:]).digest()
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else:
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x = dat
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dd = hashlib.sha1(dat).digest()
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print("hash:", str(binascii.hexlify(dd), "utf-8"))
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dd = b"\x00\x01" + b"\xff"*0x69 + b"\x00" + dd
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rsa_out = pow(int.from_bytes(dd, byteorder='big', signed=False), rsa.d, rsa.n)
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sig = (hex(rsa_out)[2:].rjust(0x100, '0'))
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x += binascii.unhexlify(sig)
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f.write(x)
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