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'''
random data ed25519 test
'''
import os
from secrets import randbelow
from lib25519 import ed25519
def test_ed25519() -> None:
'''
random data ed25519 test
'''
pk, sk = ed25519.keypair()
m1 = os.urandom(128 + randbelow(128))
sm = ed25519.sign(m1, sk)
m2 = ed25519.open(sm, pk)
assert m1 == m2
# replace every byte in a signed message and check if open fails
for i in range(len(sm)):
modifiedsm = bytearray(sm)
modifiedsm[i] = (modifiedsm[i] + 1 + randbelow(255)) % 256
modifiedsm = bytes(modifiedsm)
try:
modifiedm = ed25519.open(modifiedsm, pk)
except ValueError:
pass
else:
raise ValueError('message forgery not detected !!!')
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