149 lines
5.7 KiB
Python
149 lines
5.7 KiB
Python
"""TREZOR-like interface for Ledger hardware wallet."""
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import binascii
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import struct
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from trezorlib.types_pb2 import IdentityType # pylint: disable=import-error,unused-import
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from . import util
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class LedgerClientConnection(object):
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"""Mock for TREZOR-like connection object."""
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def __init__(self, dongle):
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"""Create connection."""
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self.dongle = dongle
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@staticmethod
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def expand_path(path):
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"""Convert BIP32 path into bytes."""
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return b''.join((struct.pack('>I', e) for e in path))
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@staticmethod
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def convert_public_key(ecdsa_curve_name, result):
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"""Convert Ledger reply into PublicKey object."""
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from trezorlib.messages_pb2 import PublicKey # pylint: disable=import-error
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if ecdsa_curve_name == 'nist256p1':
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if (result[64] & 1) != 0:
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result = bytearray([0x03]) + result[1:33]
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else:
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result = bytearray([0x02]) + result[1:33]
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else:
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result = result[1:]
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keyX = bytearray(result[0:32])
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keyY = bytearray(result[32:][::-1])
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if (keyX[31] & 1) != 0:
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keyY[31] |= 0x80
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result = b'\x00' + bytes(keyY)
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publicKey = PublicKey()
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publicKey.node.public_key = bytes(result)
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return publicKey
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# pylint: disable=unused-argument
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def get_public_node(self, n, ecdsa_curve_name='secp256k1', show_display=False):
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"""Get PublicKey object for specified BIP32 address and elliptic curve."""
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donglePath = LedgerClientConnection.expand_path(n)
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if ecdsa_curve_name == 'nist256p1':
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p2 = '01'
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else:
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p2 = '02'
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apdu = '800200' + p2
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apdu = binascii.unhexlify(apdu)
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apdu += bytearray([len(donglePath) + 1, len(donglePath) // 4])
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apdu += donglePath
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result = bytearray(self.dongle.exchange(bytes(apdu)))[1:]
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return LedgerClientConnection.convert_public_key(ecdsa_curve_name, result)
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# pylint: disable=too-many-locals
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def sign_identity(self, identity, challenge_hidden, challenge_visual,
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ecdsa_curve_name='secp256k1'):
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"""Sign specified challenges using secret key derived from given identity."""
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from trezorlib.messages_pb2 import SignedIdentity # pylint: disable=import-error
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n = util.get_bip32_address(identity)
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donglePath = LedgerClientConnection.expand_path(n)
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if identity.proto == 'ssh':
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ins = '04'
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p1 = '00'
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else:
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ins = '08'
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p1 = '00'
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if ecdsa_curve_name == 'nist256p1':
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p2 = '81' if identity.proto == 'ssh' else '01'
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else:
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p2 = '82' if identity.proto == 'ssh' else '02'
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apdu = '80' + ins + p1 + p2
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apdu = binascii.unhexlify(apdu)
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apdu += bytearray([len(challenge_hidden) + len(donglePath) + 1])
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apdu += bytearray([len(donglePath) // 4]) + donglePath
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apdu += challenge_hidden
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result = bytearray(self.dongle.exchange(bytes(apdu)))
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if ecdsa_curve_name == 'nist256p1':
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offset = 3
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length = result[offset]
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r = result[offset+1:offset+1+length]
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if r[0] == 0:
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r = r[1:]
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offset = offset + 1 + length + 1
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length = result[offset]
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s = result[offset+1:offset+1+length]
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if s[0] == 0:
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s = s[1:]
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offset = offset + 1 + length
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signature = SignedIdentity()
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signature.signature = b'\x00' + bytes(r) + bytes(s)
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if identity.proto == 'ssh':
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keyData = result[offset:]
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pk = LedgerClientConnection.convert_public_key(ecdsa_curve_name, keyData)
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signature.public_key = pk.node.public_key
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return signature
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else:
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signature = SignedIdentity()
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signature.signature = b'\x00' + bytes(result[0:64])
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if identity.proto == 'ssh':
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keyData = result[64:]
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pk = LedgerClientConnection.convert_public_key(ecdsa_curve_name, keyData)
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signature.public_key = pk.node.public_key
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return signature
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def get_ecdh_session_key(self, identity, peer_public_key, ecdsa_curve_name='secp256k1'):
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"""Create shared secret key for GPG decryption."""
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from trezorlib.messages_pb2 import ECDHSessionKey # pylint: disable=import-error
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n = util.get_bip32_address(identity, True)
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donglePath = LedgerClientConnection.expand_path(n)
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if ecdsa_curve_name == 'nist256p1':
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p2 = '01'
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else:
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p2 = '02'
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apdu = '800a00' + p2
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apdu = binascii.unhexlify(apdu)
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apdu += bytearray([len(peer_public_key) + len(donglePath) + 1])
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apdu += bytearray([len(donglePath) // 4]) + donglePath
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apdu += peer_public_key
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result = bytearray(self.dongle.exchange(bytes(apdu)))
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sessionKey = ECDHSessionKey()
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sessionKey.session_key = bytes(result)
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return sessionKey
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def clear_session(self):
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"""Mock for TREZOR interface compatibility."""
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pass
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def close(self):
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"""Close connection."""
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self.dongle.close()
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# pylint: disable=unused-argument
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# pylint: disable=no-self-use
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def ping(self, msg, button_protection=False, pin_protection=False,
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passphrase_protection=False):
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"""Mock for TREZOR interface compatibility."""
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return msg
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class CallException(Exception):
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"""Ledger-related error (mainly for TREZOR compatibility)."""
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def __init__(self, code, message):
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"""Create an error."""
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super(CallException, self).__init__()
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self.args = [code, message]
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