def dump_urbit_packet(args, timestamp, srcaddr, sport, dstaddr, dport, data):
try:
# Urbit header and payload
urhdr = unpack('<L', data[0:4])[0]
proto = urhdr & 7
mug = (urhdr >> 3) & 0xfffff
yax = (urhdr >> 23) & 3
yax_bytes = 1<<(yax+1)
qax = (urhdr >> 25) & 3
qax_bytes = 1<<(qax+1)
crypto = (urhdr >> 27)
sender = from_le(data[4:4+yax_bytes])
receiver = from_le(data[4+yax_bytes:4+yax_bytes+qax_bytes])
payload = data[4+yax_bytes+qax_bytes:]
if crypto == 2: # %fast
keyhash = from_le(payload[0:16])
payload = payload[16:]
else:
keyhash = None
except (IndexError, struct.error):
print('Warn: invpkt')
return
# Decode packet if crypto known
decrypted = False
if crypto in [0,1]: # %none %open
decrypted = True
if crypto == 2 and keyhash in args.keys: # %fast
payload = from_le(payload)
payload = de_crua(args.keys[keyhash], payload)
payload = to_le(payload)
decrypted = True
# Print packet
hdata = [('proto', str(proto)),
('mug', '%05x' % mug),
('crypto', crypto_name(crypto))]
if keyhash is not None and (args.always_show_keyhashes or not decrypted):
hdata += [('keyhash', format_hexnum(keyhash))]
if srcaddr is not None:
metadata = ''
if args.show_timestamps:
metadata += colorize(datetime.datetime.utcfromtimestamp(timestamp).strftime('%H%M%S.%f'), COLOR_TIMESTAMP) + ' '
metadata += (colorize(ipv4str(srcaddr), COLOR_IP) + v_colon + colorize(str(sport), COLOR_IP) + ' ' +
colorize(pname(sender), COLOR_RECIPIENT) + ' ' +
v_arrow + ' ' +
colorize(ipv4str(dstaddr), COLOR_IP) + v_colon + colorize(str(dport), COLOR_IP) + ' ' +
colorize(pname(receiver), COLOR_RECIPIENT))
else:
metadata = (' %fore ' + # nested packet
colorize(pname(sender), COLOR_RECIPIENT) + ' ' +
v_arrow + ' ' +
colorize(pname(receiver), COLOR_RECIPIENT))
print( metadata + v_colon + ' ' +
' '.join(colorize(key, COLOR_HEADER) + v_equal + colorize(value, COLOR_VALUE) for (key,value) in hdata))
if decrypted: # decrypted or unencrypted data
if args.show_raw:
print(' ' + colorize(hexstr(payload), COLOR_DATA))
cake = cue(from_le(payload))
if cake[0] == 1701998438: # %fore
subpacket = to_le(cake[1][1][1])
dump_urbit_packet(args, None, None, None, None, None, subpacket)
else:
if args.show_nouns:
sys.stdout.write(' ')
dump_noun(cake, sys.stdout)
sys.stdout.write('\n')
else: # [sealed]
print(' [' + colorize(hexstr(payload), COLOR_DATA_ENC)+']')
def dump_urbit_packet(args, timestamp, srcaddr, sport, dstaddr, dport, data):
try:
# Urbit header and payload
urhdr = unpack('<L', data[0:4])[0]
proto = urhdr & 7
mug = (urhdr >> 3) & 0xfffff
yax = (urhdr >> 23) & 3
yax_bytes = 1 << (yax + 1)
qax = (urhdr >> 25) & 3
qax_bytes = 1 << (qax + 1)
crypto = (urhdr >> 27)
sender = from_le(data[4:4 + yax_bytes])
receiver = from_le(data[4 + yax_bytes:4 + yax_bytes + qax_bytes])
payload = data[4 + yax_bytes + qax_bytes:]
if crypto == 2: # %fast
keyhash = from_le(payload[0:16])
payload = payload[16:]
else:
keyhash = None
except (IndexError, struct.error):
print('Warn: invpkt')
return
# Decode packet if crypto known
decrypted = False
if crypto in [0, 1]: # %none %open
decrypted = True
if crypto == 2 and keyhash in args.keys: # %fast
payload = from_le(payload)
payload = de_crua(args.keys[keyhash], payload)
payload = to_le(payload)
decrypted = True
# Print packet
hdata = [('proto', str(proto)), ('mug', '%05x' % mug),
('crypto', crypto_name(crypto))]
if keyhash is not None and (args.always_show_keyhashes or not decrypted):
hdata += [('keyhash', format_hexnum(keyhash))]
if srcaddr is not None:
metadata = ''
if args.show_timestamps:
metadata += colorize(
datetime.datetime.utcfromtimestamp(timestamp).strftime(
'%H%M%S.%f'), COLOR_TIMESTAMP) + ' '
metadata += (colorize(ipv4str(srcaddr), COLOR_IP) + v_colon +
colorize(str(sport), COLOR_IP) + ' ' +
colorize(pname(sender), COLOR_RECIPIENT) + ' ' + v_arrow +
' ' + colorize(ipv4str(dstaddr), COLOR_IP) + v_colon +
colorize(str(dport), COLOR_IP) + ' ' +
colorize(pname(receiver), COLOR_RECIPIENT))
else:
metadata = (
' %fore ' + # nested packet
colorize(pname(sender), COLOR_RECIPIENT) + ' ' + v_arrow + ' ' +
colorize(pname(receiver), COLOR_RECIPIENT))
print(metadata + v_colon + ' ' + ' '.join(
colorize(key, COLOR_HEADER) + v_equal + colorize(value, COLOR_VALUE)
for (key, value) in hdata))
if decrypted: # decrypted or unencrypted data
if args.show_raw:
print(' ' + colorize(hexstr(payload), COLOR_DATA))
cake = cue(from_le(payload))
if cake[0] == 1701998438: # %fore
subpacket = to_le(cake[1][1][1])
dump_urbit_packet(args, None, None, None, None, None, subpacket)
else:
if args.show_nouns:
sys.stdout.write(' ')
dump_noun(cake, sys.stdout)
sys.stdout.write('\n')
else: # [sealed]
print(' [' + colorize(hexstr(payload), COLOR_DATA_ENC) + ']')
#!/usr/bin/python3
import sys
sys.path.append('..')
from urbit.crua import de_crua
#print(hex(shas(bin_to_num(b'og-a'), 0)))
#print(hex(raw_og(1, 512)))
print(hex(de_crua(1, 0xec0eaabae901dd12696324677f3e12ceeeee5d3989379a73134821e55d80837b4abac214e1e95fe0c60df79d09cbd05454a4cb958683e02318aa147f2a5e6d60)))
#!/usr/bin/python3
import sys
sys.path.append('..')
from urbit.crua import de_crua
#print(hex(shas(bin_to_num(b'og-a'), 0)))
#print(hex(raw_og(1, 512)))
print(
hex(
de_crua(
1,
0xec0eaabae901dd12696324677f3e12ceeeee5d3989379a73134821e55d80837b4abac214e1e95fe0c60df79d09cbd05454a4cb958683e02318aa147f2a5e6d60
)))
