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https://github.com/trezor/trezor-firmware.git
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15bd35824b
cosi.verify was renamed to verify_combined, because it is pretty much ed25519.verify, and the new name implies what it does in terms of the CoSi scheme: verify a signature with already-combined public keys. cosi.verify_m_of_n signature was simplified by not requiring the `n` parameter, which is not important for verification. The updated function was renamed to cosi.verify, because this is the standard CoSi verification operation: given signature, digest, required number of signatures, sigmask, and a list of public keys, verify that enough signatures are indicated and that they sign the digest.
98 lines
3.6 KiB
Python
98 lines
3.6 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2019 SatoshiLabs and contributors
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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from hashlib import sha256
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import pytest
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from trezorlib import cosi
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from trezorlib.tools import parse_path
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@pytest.mark.skip_t2
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class TestCosi:
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def test_cosi_commit(self, client):
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digest = sha256(b"this is a message").digest()
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c0 = cosi.commit(client, parse_path("10018'/0'"), digest)
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c1 = cosi.commit(client, parse_path("10018'/1'"), digest)
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c2 = cosi.commit(client, parse_path("10018'/2'"), digest)
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assert c0.pubkey != c1.pubkey
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assert c0.pubkey != c2.pubkey
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assert c1.pubkey != c2.pubkey
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assert c0.commitment != c1.commitment
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assert c0.commitment != c2.commitment
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assert c1.commitment != c2.commitment
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digestb = sha256(b"this is a different message").digest()
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c0b = cosi.commit(client, parse_path("10018'/0'"), digestb)
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c1b = cosi.commit(client, parse_path("10018'/1'"), digestb)
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c2b = cosi.commit(client, parse_path("10018'/2'"), digestb)
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assert c0.pubkey == c0b.pubkey
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assert c1.pubkey == c1b.pubkey
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assert c2.pubkey == c2b.pubkey
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assert c0.commitment != c0b.commitment
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assert c1.commitment != c1b.commitment
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assert c2.commitment != c2b.commitment
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def test_cosi_sign(self, client):
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digest = sha256(b"this is a message").digest()
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c0 = cosi.commit(client, parse_path("10018'/0'"), digest)
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c1 = cosi.commit(client, parse_path("10018'/1'"), digest)
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c2 = cosi.commit(client, parse_path("10018'/2'"), digest)
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global_pk = cosi.combine_keys([c0.pubkey, c1.pubkey, c2.pubkey])
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global_R = cosi.combine_keys([c0.commitment, c1.commitment, c2.commitment])
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# fmt: off
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sig0 = cosi.sign(client, parse_path("10018'/0'"), digest, global_R, global_pk)
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sig1 = cosi.sign(client, parse_path("10018'/1'"), digest, global_R, global_pk)
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sig2 = cosi.sign(client, parse_path("10018'/2'"), digest, global_R, global_pk)
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# fmt: on
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sig = cosi.combine_sig(
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global_R, [sig0.signature, sig1.signature, sig2.signature]
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)
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cosi.verify_combined(sig, digest, global_pk)
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def test_cosi_compat(self, client):
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digest = sha256(b"this is not a pipe").digest()
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remote_commit = cosi.commit(client, parse_path("10018'/0'"), digest)
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local_privkey = sha256(b"private key").digest()[:32]
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local_pubkey = cosi.pubkey_from_privkey(local_privkey)
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local_nonce, local_commitment = cosi.get_nonce(local_privkey, digest, 42)
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global_pk = cosi.combine_keys([remote_commit.pubkey, local_pubkey])
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global_R = cosi.combine_keys([remote_commit.commitment, local_commitment])
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remote_sig = cosi.sign(
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client, parse_path("10018'/0'"), digest, global_R, global_pk
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)
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local_sig = cosi.sign_with_privkey(
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digest, local_privkey, global_pk, local_nonce, global_R
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)
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sig = cosi.combine_sig(global_R, [remote_sig.signature, local_sig])
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cosi.verify_combined(sig, digest, global_pk)
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