def btc_sign_msg(self, coin: btc.BTCCoin,
script_config: btc.BTCScriptConfigWithKeypath,
msg: bytes) -> Tuple[bytes, int, bytes]:
"""
Returns a 64 byte sig, the recoverable id, and a 65 byte signature containing
the recid, compatible with Electrum.
"""
# pylint: disable=no-member,line-too-long
self._require_atleast(semver.VersionInfo(9, 2, 0))
request = btc.BTCRequest()
request.sign_message.CopyFrom(
btc.BTCSignMessageRequest(coin=coin,
script_config=script_config,
msg=msg))
sig = self._btc_msg_query(
request, expected_response="sign_message").sign_message.signature
sig, recid = sig[:64], sig[64]
# See https://github.com/spesmilo/electrum/blob/84dc181b6e7bb20e88ef6b98fb8925c5f645a765/electrum/ecc.py#L521-L523
compressed = 4 # BitBox02 uses only compressed pubkeys
electrum_sig65 = bytes([27 + compressed + recid]) + sig
return (sig, recid, electrum_sig65)
def btc_sign_msg(
self, coin: btc.BTCCoin, script_config: btc.BTCScriptConfigWithKeypath, msg: bytes
) -> Tuple[bytes, int, bytes]:
"""
Returns a 64 byte sig, the recoverable id, and a 65 byte signature containing
the recid, compatible with Electrum.
"""
# pylint: disable=no-member,line-too-long
self._require_atleast(semver.VersionInfo(9, 2, 0))
request = btc.BTCRequest()
request.sign_message.CopyFrom(
btc.BTCSignMessageRequest(coin=coin, script_config=script_config, msg=msg)
)
supports_antiklepto = self.version >= semver.VersionInfo(9, 5, 0)
if supports_antiklepto:
host_nonce = os.urandom(32)
request.sign_message.host_nonce_commitment.commitment = antiklepto_host_commit(
host_nonce
)
signer_commitment = self._btc_msg_query(
request, expected_response="antiklepto_signer_commitment"
).antiklepto_signer_commitment.commitment
request = btc.BTCRequest()
request.antiklepto_signature.CopyFrom(
antiklepto.AntiKleptoSignatureRequest(host_nonce=host_nonce)
)
signature = self._btc_msg_query(
request, expected_response="sign_message"
).sign_message.signature
antiklepto_verify(host_nonce, signer_commitment, signature[:64])
if self.debug:
print(f"Antiklepto nonce verification PASSED")
else:
signature = self._btc_msg_query(
request, expected_response="sign_message"
).sign_message.signature
sig, recid = signature[:64], signature[64]
# See https://github.com/spesmilo/electrum/blob/84dc181b6e7bb20e88ef6b98fb8925c5f645a765/electrum/ecc.py#L521-L523
compressed = 4 # BitBox02 uses only compressed pubkeys
electrum_sig65 = bytes([27 + compressed + recid]) + sig
return (sig, recid, electrum_sig65)