25 lines
571 B
Python
Executable File
25 lines
571 B
Python
Executable File
#!/usr/bin/env python
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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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rsa = RSA.importKey(open(sys.argv[3]).read())
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with open(sys.argv[1]) 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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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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dd = "\x00\x01" + "\xff"*0x69 + "\x00" + dd
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rsa_out = pow(int(dd.encode("hex"), 16), rsa.d, rsa.n)
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sig = (hex(rsa_out)[2:-1].rjust(0x100, '0')).decode("hex")
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x += sig
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f.write(x)
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