def parse_fixed(byte_string):
if len(byte_string) != ONION_BYTE_LENGTH:
return None, "onion is the wrong length"
version, remainder, err = Namespace.pop_u8(byte_string)
if err:
return None, "could not pop version byte"
if version != 0:
return None, "unsupported onion packet version"
public_key, remainder, err = Namespace.pop_point(remainder)
if err:
return None, "could not pop public key: %s" % err
hop_payloads, remainder, err = Namespace.pop_bytes(HOP_PAYLOADS_LENGTH,
remainder)
if err:
return None, "could not pop hops_payloads: %s" % err
hmac, remainder, err = Namespace.pop_bytes(HMAC_LENGTH, remainder)
if err:
return None, "could not pop hmac: %s" % err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
# TODO Check hmac for validity, need assocdata
return {'version': version,
'public_key': public_key,
'hop_payloads': hop_payloads,
'hmac': hmac}, None
def parse_tlv3(self, tlv):
print("parsing tlv3: %s" % tlv)
node_id, remainder, err = Namespace.pop_point(tlv.v)
if err:
return None, err
amount_msat_1, remainder, err = Namespace.pop_u64(remainder)
if err:
return None, err
amount_msat_2, remainder, err = Namespace.pop_u64(remainder)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': "tlv3",
'node_id': node_id,
'amount_msat_1': amount_msat_1,
'amount_msat_2': amount_msat_2
}, None