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micropython-curve25519
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corrected lenth

master
pmvr 2020-06-14 15:32:03 +02:00
parent 831e1776e4
commit 4b31304c08
1 changed files with 3 additions and 3 deletions
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6
ed25519.py
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@ -35,15 +35,15 @@ def secret_expand(secret):
# The signature function works as below.
def sign(secret, msg):
u = b'\x09' + bytes(35)
u = b'\x09' + bytes(31)
v = b'\xd9\xd3\xce~\xa2\xc5\xe9)\xb2a|m~M=\x92L\xd1Hw,\xdd\x1e\xe0\xb4\x86\xa0\xb8\xa1\x19\xae \x00\x00\x00\x00'
a, prefix = secret_expand(secret)
# A = point_compress(point_mul(a, G))
xy = curve25519.x25519_ed(a.to_bytes(36, 'little'), u, v)
xy = curve25519.x25519_ed(a.to_bytes(32, 'little'), u, v)
A = point_compress((int.from_bytes(xy[0], 'little'), int.from_bytes(xy[1], 'little')))
r = sha512_modq(prefix + msg)
# R = point_mul(r, G)
xy = curve25519.x25519_ed(r.to_bytes(36, 'little'), u, v)
xy = curve25519.x25519_ed(r.to_bytes(32, 'little'), u, v)
R = (int.from_bytes(xy[0], 'little'), int.from_bytes(xy[1], 'little'))
Rs = point_compress(R)
h = sha512_modq(Rs + A + msg)