mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-27 01:48:17 +00:00
enable crc32, update protocol, add session closing
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parent
531350d6ba
commit
80ffa27052
@ -1,5 +1,6 @@
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import struct
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import mapping
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import binascii
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class NotImplementedException(Exception):
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pass
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@ -156,7 +157,7 @@ class TransportV2(Transport):
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data = bytearray(msg.SerializeToString())
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# Convert to unsigned in python2
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checksum = 0 # binascii.crc32(data) & 0xffffffff
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checksum = binascii.crc32(data) & 0xffffffff
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header1 = struct.pack(">L", self.session_id)
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header2 = struct.pack(">LL", mapping.get_type(msg), len(data))
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@ -169,12 +170,12 @@ class TransportV2(Transport):
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if first:
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# Magic character, header1, header2, data padded to 64 bytes
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datalen = 63 - len(header1)
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chunk = b'!' + header1 + \
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chunk = b'H' + header1 + \
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data[:datalen] + b'\0' * (datalen - len(data[:datalen]))
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else:
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# Magic character, header1, data padded to 64 bytes
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datalen = 63 - len(header1)
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chunk = b'#' + header1 + \
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chunk = b'D' + header1 + \
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data[:datalen] + b'\0' * (datalen - len(data[:datalen]))
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self._write_chunk(chunk)
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@ -199,13 +200,16 @@ class TransportV2(Transport):
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footer = data[-4:]
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data = data[:-4]
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# csum = struct.unpack('>L', footer)
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# assert csum == binascii.crc32(data), "Checksum mismatch"
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csum, = struct.unpack('>L', footer)
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csum_comp = binascii.crc32(data) & 0xffffffff
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if csum != csum_comp:
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raise Exception("Message checksum mismatch. Expected %d, got %d" %
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(csum_comp, csum))
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return (session_id, msg_type, data)
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def parse_first(self, chunk):
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if chunk[0:1] != b"!":
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if chunk[0:1] != b"H":
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raise Exception("Unexpected magic character")
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try:
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@ -218,7 +222,7 @@ class TransportV2(Transport):
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return (session_id, msg_type, datalen, data)
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def parse_next(self, chunk):
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if chunk[0:1] != b"#":
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if chunk[0:1] != b"D":
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raise Exception("Unexpected magic characters")
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try:
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@ -230,27 +234,28 @@ class TransportV2(Transport):
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data = chunk[1 + headerlen:]
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return (session_id, data)
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def parse_session(self, chunk):
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if chunk[0:1] != b"!":
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def parse_session_open(self, chunk):
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if chunk[0:1] != b"O":
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raise Exception("Unexpected magic character")
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try:
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headerlen = struct.calcsize(">LL")
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(null_session_id, new_session_id) = struct.unpack(
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">LL", bytes(chunk[1:1 + headerlen]))
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headerlen = struct.calcsize(">L")
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(session_id,) = struct.unpack(">L", bytes(chunk[1:1 + headerlen]))
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except:
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raise Exception("Cannot parse header")
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if null_session_id != 0:
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raise Exception("Session response needs to use session ID 0")
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return new_session_id
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return session_id
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def _session_begin(self):
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self._write_chunk(b'!' + b'\0' * 63)
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self.session_id = self.parse_session(self._read_chunk())
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self._write_chunk(b'O' + b'\0' * 63)
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self.session_id = self.parse_session_open(self._read_chunk())
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def _session_end(self):
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pass
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header = struct.pack(">L", self.session_id)
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self._write_chunk(b'C' + header + b'\0' * (63 - len(header)))
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if self._read_chunk()[0] != ord('C'):
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raise Exception("Expected session close")
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self.session_id = None
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'''
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def read_headers(self, read_f):
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