def test_punctuation(self):
''' AffineSubstitution (test_punctuation): punctuation should be unmodified '''
e = AffineSubstitution(a=7,b=8)
original = '!@$%%^&*()_-+={}[]|":;<>,./?'
enciphered = e.encipher(original,keep_punct=True)
self.assertEqual(original.upper(), enciphered.upper())
e = AffineSubstitution(a=7,b=8)
original = '!@$%%^&*()_-+={}[]|":;<>,./?'
enciphered = e.encipher(original,keep_punct=False)
self.assertEqual('', enciphered.upper())
def test_decipher(self):
''' AffineSubstitution (test_decipher): test known ciphertext->plaintext pairs '''
text = 'pmjgdaxurolifczwtqnkhebyvspmjgdaxurolifczwtqnkhebyvs'
declist = ['yfmtahovcjqxelszgnubipwdkryfmtahovcjqxelszgnubipwdkr',
'onmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqp',
'jarizqhypgxofwnevmdulctkbsjarizqhypgxofwnevmdulctkbs',
'pmjgdaxurolifczwtqnkhebyvspmjgdaxurolifczwtqnkhebyvs',
'tmfyrkdwpibungzslexqjcvohatmfyrkdwpibungzslexqjcvoha',
'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz']
for i,key in enumerate(((7,3),(3,25),(9,12),(1,0),(19,18),(23,15))):
a,b = key
dec = AffineSubstitution(a,b).decipher(text)
self.assertEqual(dec.upper(), declist[i].upper())
def test_encipher(self):
''' AffineSubstitution (test_encipher): test known plaintext->ciphertext pairs '''
text = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
enclist = ['hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefg',
'dgjmpsvybehknqtwzcfiloruxadgjmpsvybehknqtwzcfiloruxa',
'afkpuzejotydinsxchmrwbglqvafkpuzejotydinsxchmrwbglqv',
'ovcjqxelszgnubipwdkryfmtahovcjqxelszgnubipwdkryfmtah',
'sbktcludmvenwfoxgpyhqzirajsbktcludmvenwfoxgpyhqziraj',
'pmjgdaxurolifczwtqnkhebyvspmjgdaxurolifczwtqnkhebyvs']
for i,key in enumerate(((1,7),(3,3),(5,0),(7,14),(9,18),(23,15))):
a,b = key
enc = AffineSubstitution(a,b).encipher(text)
self.assertEqual(enc.upper(), enclist[i].upper())