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noise: Implement signature verification of chat messages

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Since we don't pass the public key we just rely on the pubkey recovery and the
`checkmessage` interface to tell us whether it is a publicly known `node_id`
or not.
This commit is contained in:
Christian Decker
2020-01-19 15:14:09 +01:00
parent 3d3c7f75ba
commit 528aa8410b
4 changed files with 110 additions and 8 deletions
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51
noise/zbase32.py Normal file
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import bitstring
zbase32_chars = b'ybndrfg8ejkmcpqxot1uwisza345h769'
zbase32_revchars = [
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 18, 255, 25, 26, 27, 30, 29, 7, 31, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 24, 1, 12, 3, 8, 5, 6, 28, 21, 9, 10, 255, 11, 2,
16, 13, 14, 4, 22, 17, 19, 255, 20, 15, 0, 23, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255
]
def bitarray_to_u5(barr):
assert len(barr) % 5 == 0
ret = []
s = bitstring.ConstBitStream(barr)
while s.pos != s.len:
ret.append(s.read(5).uint)
return ret
def u5_to_bitarray(arr):
ret = bitstring.BitArray()
for a in arr:
ret += bitstring.pack("uint:5", a)
return ret
def encode(b):
uint5s = bitarray_to_u5(b)
res = [zbase32_chars[c] for c in uint5s]
return bytes(res)
def decode(b):
if isinstance(b, str):
b = b.encode('ASCII')
uint5s = []
for c in b:
uint5s.append(zbase32_revchars[c])
dec = u5_to_bitarray(uint5s)
return dec.bytes