72 lines
2.0 KiB
Python
Executable File
72 lines
2.0 KiB
Python
Executable File
#!/usr/bin/env python3
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import binascii
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import struct
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import click
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import pyblake2
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from trezorlib import ed25519raw, ed25519cosi
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indexmap = {
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'bootloader': 0,
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'vendorheader': 1,
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'firmware': 2,
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}
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def header_digest(index, filename):
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data = open(filename, 'rb').read()
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z = bytes(65 * [0x00])
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if index == 'bootloader':
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header = data[:0x03BF] + z
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elif index == 'vendorheader':
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header = data[:-65] + z
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elif index == 'firmware':
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vhdrlen = struct.unpack('<I', data[4:8])[0]
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header = data[vhdrlen:vhdrlen + 0x03BF] + z
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else:
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raise ValueError('Unknown index "%s"' % index)
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return pyblake2.blake2s(header).digest()
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@click.group()
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def cli():
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pass
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@cli.command(help='')
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@click.argument('index', type=click.Choice(indexmap.keys()))
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@click.argument('filename')
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@click.argument('seckeys', nargs=-1)
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def sign(index, filename, seckeys):
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# compute header digest
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digest = header_digest(index, filename)
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# collect commits
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pks, Rs = [], []
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for ctr, seckey in enumerate(seckeys):
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sk = binascii.unhexlify(seckey)
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pk = ed25519raw.publickey(sk)
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_, R = ed25519cosi.get_nonce(sk, digest, ctr)
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pks.append(pk)
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Rs.append(R)
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# compute global commit
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global_pk = ed25519cosi.combine_keys(pks)
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global_R = ed25519cosi.combine_keys(Rs)
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# collect signatures
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sigs = []
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for ctr, seckey in enumerate(seckeys):
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sk = binascii.unhexlify(seckey)
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r, _ = ed25519cosi.get_nonce(sk, digest, ctr)
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h = ed25519raw.H(sk)
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b = ed25519raw.b
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a = 2 ** (b - 2) + sum(2 ** i * ed25519raw.bit(h, i) for i in range(3, b - 2))
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S = (r + ed25519raw.Hint(global_R + global_pk + digest) * a) % ed25519raw.l
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sig = ed25519raw.encodeint(S)
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sigs.append(sig)
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# compute global signature
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sig = ed25519cosi.combine_sig(global_R, sigs)
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ed25519raw.checkvalid(sig, digest, global_pk)
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print(binascii.hexlify(sig).decode())
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if __name__ == '__main__':
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cli()
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