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118 lines
4.7 KiB
Python
118 lines
4.7 KiB
Python
"""TREZOR-related code (see http://bitcointrezor.com/)."""
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import binascii
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import logging
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import os
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import semver
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from . import interface
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log = logging.getLogger(__name__)
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class Trezor(interface.Device):
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"""Connection to TREZOR device."""
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@property
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def _defs(self):
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from . import trezor_defs
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# Allow using TREZOR bridge transport (instead of the HID default)
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trezor_defs.Transport = {
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'bridge': trezor_defs.BridgeTransport,
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}.get(os.environ.get('TREZOR_TRANSPORT'), trezor_defs.HidTransport)
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return trezor_defs
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required_version = '>=1.4.0'
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passphrase = os.environ.get('TREZOR_PASSPHRASE', '')
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def connect(self):
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"""Enumerate and connect to the first USB HID interface."""
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def passphrase_handler(_):
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log.debug('using %s passphrase for %s',
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'non-empty' if self.passphrase else 'empty', self)
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return self._defs.PassphraseAck(passphrase=self.passphrase)
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for d in self._defs.Transport.enumerate():
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log.debug('endpoint: %s', d)
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transport = self._defs.Transport(d)
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connection = self._defs.Client(transport)
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connection.callback_PassphraseRequest = passphrase_handler
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f = connection.features
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log.debug('connected to %s %s', self, f.device_id)
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log.debug('label : %s', f.label)
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log.debug('vendor : %s', f.vendor)
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current_version = '{}.{}.{}'.format(f.major_version,
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f.minor_version,
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f.patch_version)
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log.debug('version : %s', current_version)
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log.debug('revision : %s', binascii.hexlify(f.revision))
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if not semver.match(current_version, self.required_version):
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fmt = ('Please upgrade your {} firmware to {} version'
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' (current: {})')
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raise ValueError(fmt.format(self, self.required_version,
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current_version))
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connection.ping(msg='', pin_protection=True) # unlock PIN
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return connection
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raise interface.NotFoundError('{} not connected'.format(self))
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def close(self):
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"""Close connection."""
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self.conn.close()
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def pubkey(self, identity, ecdh=False):
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"""Return public key."""
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curve_name = identity.get_curve_name(ecdh=ecdh)
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log.debug('"%s" getting public key (%s) from %s',
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identity, curve_name, self)
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addr = identity.get_bip32_address(ecdh=ecdh)
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result = self.conn.get_public_node(n=addr,
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ecdsa_curve_name=curve_name)
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log.debug('result: %s', result)
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return result.node.public_key
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def _identity_proto(self, identity):
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result = self._defs.IdentityType()
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for name, value in identity.items():
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setattr(result, name, value)
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return result
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def sign(self, identity, blob):
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"""Sign given blob and return the signature (as bytes)."""
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curve_name = identity.get_curve_name(ecdh=False)
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log.debug('"%s" signing %r (%s) on %s',
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identity, blob, curve_name, self)
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try:
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result = self.conn.sign_identity(
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identity=self._identity_proto(identity),
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challenge_hidden=blob,
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challenge_visual='',
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ecdsa_curve_name=curve_name)
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log.debug('result: %s', result)
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assert len(result.signature) == 65
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assert result.signature[:1] == b'\x00'
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return result.signature[1:]
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except self._defs.Error as e:
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msg = '{} error: {}'.format(self, e)
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log.debug(msg, exc_info=True)
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raise interface.DeviceError(msg)
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def ecdh(self, identity, pubkey):
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"""Get shared session key using Elliptic Curve Diffie-Hellman."""
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curve_name = identity.get_curve_name(ecdh=True)
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log.debug('"%s" shared session key (%s) for %r from %s',
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identity, curve_name, pubkey, self)
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try:
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result = self.conn.get_ecdh_session_key(
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identity=self._identity_proto(identity),
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peer_public_key=pubkey,
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ecdsa_curve_name=curve_name)
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log.debug('result: %s', result)
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assert len(result.session_key) in {65, 33} # NIST256 or Curve25519
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assert result.session_key[:1] == b'\x04'
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return result.session_key
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except self._defs.Error as e:
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msg = '{} error: {}'.format(self, e)
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log.debug(msg, exc_info=True)
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raise interface.DeviceError(msg)
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