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'''
random data test
'''
import os
from secrets import randbelow
from lib1305 import poly1305
def test_random() -> None:
'''
random data test
'''
# generate a random 256-bit secret key
k = os.urandom(32)
# generate a random massage
m = os.urandom(128 + randbelow(128))
# compute an 128-bit authenticator
a = poly1305.auth(m, k)
# verify and 128-bit authenticator
poly1305.verify(a, m, k)
# replace byte in a message and check if verification fails
for i in range(len(m)):
m1 = bytearray(m)
m1[i] = (m1[i] + 1 + randbelow(255)) % 256
m1 = bytes(m1)
try:
poly1305.verify(a, m1, k)
except ValueError:
pass
else:
raise ValueError('message forgery not detected !!!')
# replace byte in an authentificatior and check if verification fails
for i in range(len(a)):
a1 = bytearray(a)
a1[i] = (a1[i] + 1 + randbelow(255)) % 256
a1 = bytes(a1)
try:
poly1305.verify(a1, m, k)
except ValueError:
pass
else:
raise ValueError('authenticator forgery not detected !!!')
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