mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-20 06:28:09 +00:00
76 lines
2.1 KiB
Python
Executable File
76 lines
2.1 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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import Pyro4
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import serpent
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from trezorlib import cosi
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PORT = 5001
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indexmap = {"bootloader": 0, "vendorheader": 1, "firmware": 2}
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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("participants", nargs=-1)
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def sign(index, filename, participants):
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# compute header digest
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digest = header_digest(index, filename)
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# create participant proxies
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if len(participants) < 1:
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raise ValueError("Not enough participants")
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print("connecting to %d participants:" % len(participants))
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proxy = []
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for p in participants:
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uri = "PYRO:keyctl@%s:%d" % (p, PORT)
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proxy.append(Pyro4.Proxy(uri))
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# collect commits
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pks, Rs = [], []
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for i, p in enumerate(proxy):
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pk, R = p.get_commit(index, digest)
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pk, R = serpent.tobytes(pk), serpent.tobytes(R)
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pks.append(pk)
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Rs.append(R)
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print("collected commit #%d from %s" % (i, p._pyroUri.host))
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# compute global commit
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global_pk = cosi.combine_keys(pks)
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global_R = cosi.combine_keys(Rs)
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# collect signatures
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sigs = []
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for i, p in enumerate(proxy):
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sig = p.get_signature(index, digest, global_R, global_pk)
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sig = serpent.tobytes(sig)
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sigs.append(sig)
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print("collected signature #%d from %s" % (i, p._pyroUri.host))
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# compute global signature
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sig = cosi.combine_sig(global_R, sigs)
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cosi.verify(sig, digest, global_pk)
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print("global signature:")
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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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