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feat(core): CoSi collective signatures

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This commit is contained in:
Martin Milata 2022-11-25 21:09:34 +01:00
parent 701d75d6d8
commit b12de5d861
9 changed files with 103 additions and 10 deletions
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1
core/.changelog.d/450.added Normal file
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@ -0,0 +1 @@
CoSi collective signatures on Model T.

2
core/src/all_modules.py
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@ -341,6 +341,8 @@ apps.misc
import apps.misc
apps.misc.cipher_key_value
import apps.misc.cipher_key_value
apps.misc.cosi_commit
import apps.misc.cosi_commit
apps.misc.get_ecdh_session_key
import apps.misc.get_ecdh_session_key
apps.misc.get_entropy

6
core/src/apps/cardano/helpers/paths.py
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@ -1,6 +1,6 @@
from micropython import const
from apps.common.paths import HARDENED, PathSchema
from apps.common.paths import HARDENED, PathSchema, unharden # noqa: F401
_SLIP44_ID = const(1815)
@ -28,7 +28,3 @@ CHANGE_OUTPUT_STAKING_PATH_NAME = "Change output staking path"
CERTIFICATE_PATH_NAME = "Certificate path"
POOL_OWNER_STAKING_PATH_NAME = "Pool owner staking path"
WITNESS_PATH_NAME = "Witness path"
def unharden(item: int) -> int:
return item ^ (item & HARDENED)

7
core/src/apps/common/paths.py
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@ -290,9 +290,6 @@ class PathSchema:
components = ["m"]
append = components.append # local_cache_attribute
def unharden(item: int) -> int:
return item ^ (item & HARDENED)
for component in self.schema:
if isinstance(component, Interval):
a, b = component.min, component.max
@ -378,3 +375,7 @@ def address_n_to_str(address_n: Iterable[int]) -> str:
return "m"
return "m/" + "/".join(_path_item(i) for i in address_n)
def unharden(item: int) -> int:
return item ^ (item & HARDENED)

73
core/src/apps/misc/cosi_commit.py Normal file
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@ -0,0 +1,73 @@
from typing import TYPE_CHECKING
from trezor.enums import ButtonRequestType
from trezor.messages import CosiCommitment, CosiSign, CosiSignature
from trezor.wire import DataError
from apps.common.paths import PathSchema, unharden
if TYPE_CHECKING:
from trezor.messages import CosiCommit
from trezor.wire import Context
# This module implements the cosigner part of the CoSi collective signatures
# as described in https://dedis.cs.yale.edu/dissent/papers/witness.pdf
SCHEMA_SLIP18 = PathSchema.parse("m/10018'/address_index'/*'", slip44_id=())
# SLIP-26: m/10026'/model'/type'/rotation_index'
# - `model`: ASCII for 1, T, or R, or 0 for common things (keep the ASCII range open for future models).
# - `type`: 0 = bootloader, 1 = vendorheader, 2 = firmware, 3 = definitions, 4 = reserved
# - `rotation_index`: a fixed 0' for now
SCHEMA_SLIP26 = PathSchema.parse("m/10026'/[0-127]'/[0-4]'/0'", slip44_id=())
async def cosi_commit(ctx: Context, msg: CosiCommit) -> CosiSignature:
import storage.cache as storage_cache
from trezor.crypto.curve import ed25519
from trezor.ui.layouts import confirm_blob
from apps.common import paths
from apps.common.keychain import get_keychain
keychain = await get_keychain(ctx, "ed25519", [SCHEMA_SLIP18, SCHEMA_SLIP26])
await paths.validate_path(ctx, keychain, msg.address_n)
node = keychain.derive(msg.address_n)
seckey = node.private_key()
pubkey = ed25519.publickey(seckey)
if not storage_cache.is_set(storage_cache.APP_MISC_COSI_COMMITMENT):
nonce, commitment = ed25519.cosi_commit()
storage_cache.set(storage_cache.APP_MISC_COSI_NONCE, nonce)
storage_cache.set(storage_cache.APP_MISC_COSI_COMMITMENT, commitment)
commitment = storage_cache.get(storage_cache.APP_MISC_COSI_COMMITMENT)
if commitment is None:
raise RuntimeError
sign_msg = await ctx.call(
CosiCommitment(commitment=commitment, pubkey=pubkey), CosiSign
)
if sign_msg.address_n != msg.address_n:
raise DataError("Mismatched address_n")
title = "CoSi sign message"
if SCHEMA_SLIP18.match(sign_msg.address_n):
index = unharden(msg.address_n[1])
title = f"CoSi sign index {index}"
await confirm_blob(
ctx, "cosi_sign", title, sign_msg.data, br_code=ButtonRequestType.ProtectCall
)
# clear nonce from cache
nonce = storage_cache.get(storage_cache.APP_MISC_COSI_NONCE)
storage_cache.delete(storage_cache.APP_MISC_COSI_COMMITMENT)
storage_cache.delete(storage_cache.APP_MISC_COSI_NONCE)
if nonce is None:
raise RuntimeError
signature = ed25519.cosi_sign(
seckey, sign_msg.data, nonce, sign_msg.global_commitment, sign_msg.global_pubkey
)
return CosiSignature(signature=signature)

2
core/src/apps/workflow_handlers.py
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@ -84,6 +84,8 @@ def _find_message_handler_module(msg_type: int) -> str:
return "apps.misc.cipher_key_value"
if msg_type == MessageType.GetFirmwareHash:
return "apps.misc.get_firmware_hash"
if msg_type == MessageType.CosiCommit:
return "apps.misc.cosi_commit"
if not utils.BITCOIN_ONLY:
if msg_type == MessageType.SetU2FCounter:

4
core/src/storage/cache.py
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@ -31,6 +31,8 @@ APP_COMMON_SAFETY_CHECKS_TEMPORARY = const(1 | _SESSIONLESS_FLAG)
STORAGE_DEVICE_EXPERIMENTAL_FEATURES = const(2 | _SESSIONLESS_FLAG)
APP_COMMON_REQUEST_PIN_LAST_UNLOCK = const(3 | _SESSIONLESS_FLAG)
APP_COMMON_BUSY_DEADLINE_MS = const(4 | _SESSIONLESS_FLAG)
APP_MISC_COSI_NONCE = const(5 | _SESSIONLESS_FLAG)
APP_MISC_COSI_COMMITMENT = const(6 | _SESSIONLESS_FLAG)
# === Homescreen storage ===
@ -137,6 +139,8 @@ class SessionlessCache(DataCache):
1, # STORAGE_DEVICE_EXPERIMENTAL_FEATURES
8, # APP_COMMON_REQUEST_PIN_LAST_UNLOCK
8, # APP_COMMON_BUSY_DEADLINE_MS
32, # APP_MISC_COSI_NONCE
32, # APP_MISC_COSI_COMMITMENT
)
super().__init__()

12
tests/device_tests/misc/test_cosi.py
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@ -20,10 +20,9 @@ import pytest
from trezorlib import cosi
from trezorlib.debuglink import TrezorClientDebugLink as Client
from trezorlib.exceptions import TrezorFailure
from trezorlib.tools import parse_path
pytestmark = pytest.mark.skip_t2
DIGEST = sha256(b"this is not a pipe").digest()
@ -108,3 +107,12 @@ def test_cosi_sign3(client: Client):
)
cosi.verify_combined(signature, DIGEST, global_pk)
@pytest.mark.skip_t1
def test_cosi_different_key(client: Client):
with pytest.raises(TrezorFailure):
commit = cosi.commit(client, parse_path("m/10018h/0h"))
cosi.sign(
client, parse_path("m/10018h/1h"), DIGEST, commit.commitment, commit.pubkey
)

6
tests/ui_tests/fixtures.json
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@ -1408,6 +1408,12 @@
"TT_ethereum-test_signtx.py::test_signtx_eip1559[unknown_erc20]": "2189a082fe612b0821072ab5260aca76e77dfeccb592c013409f1ef7812c8226",
"TT_ethereum-test_signtx.py::test_signtx_eip1559_access_list": "14f159d0b62d7697bcbcd56ed41b8affa86ffea1d7aa6f2d0c3ce168fb990431",
"TT_ethereum-test_signtx.py::test_signtx_eip1559_access_list_larger": "14f159d0b62d7697bcbcd56ed41b8affa86ffea1d7aa6f2d0c3ce168fb990431",
"TT_misc-test_cosi.py::test_cosi_different_key": "f03b50df7f4a161078fa903c44f37272961b70358d4014d30a12888e1fd2caf1",
"TT_misc-test_cosi.py::test_cosi_nonce": "c668c0d63bbf9875ea2c3d4073e9507fc89719a19ded85e6a64ecc03e8b0287d",
"TT_misc-test_cosi.py::test_cosi_pubkey": "f03b50df7f4a161078fa903c44f37272961b70358d4014d30a12888e1fd2caf1",
"TT_misc-test_cosi.py::test_cosi_sign1": "c668c0d63bbf9875ea2c3d4073e9507fc89719a19ded85e6a64ecc03e8b0287d",
"TT_misc-test_cosi.py::test_cosi_sign2": "aea78f19619a1aac8072b41e1dfdade53ca3496af5f27801a9a929a0d65ecce6",
"TT_misc-test_cosi.py::test_cosi_sign3": "efeed01748ee5797c446294fba491d819b3ea60f4238782154cc608558960c3d",
"TT_misc-test_msg_cipherkeyvalue.py::test_decrypt": "120f9e8e4cb99d8fbd4fe5f4ce5d6a24e7aa98fafb2329a0fde01b6fa6656361",
"TT_misc-test_msg_cipherkeyvalue.py::test_decrypt_badlen": "f03b50df7f4a161078fa903c44f37272961b70358d4014d30a12888e1fd2caf1",
"TT_misc-test_msg_cipherkeyvalue.py::test_encrypt": "582b31d707b118bda01c9bd6ffab3b0a8d1ea6fa68583aa9b3032cd7921ae2c3",