def sign_is_reversible(self):
"sign/unsign should be reversible against any bytestring"
examples = (
'q;wjmbk;wkmb',
'3098247529087',
'3098247:529:087:',
'jkw osanteuh ,rcuh nthu aou oauh ,ud du',
u'\u2019'.encode('utf8'),
)
for example in examples:
self.assert_(example != signed.sign(example))
self.assertEqual(example, signed.unsign(utils.sign(example)))
def sign_is_reversible(self):
"sign/unsign should be reversible against any bytestring"
examples = (
'q;wjmbk;wkmb',
'3098247529087',
'3098247:529:087:',
'jkw osanteuh ,rcuh nthu aou oauh ,ud du',
u'\u2019'.encode('utf8'),
)
for example in examples:
self.assert_(example != signed.sign(example))
self.assertEqual(example, signed.unsign(utils.sign(example)))
def unsign_detects_tampering(self):
"unsign should raise an exception if the value has been tampered with"
value = 'Another string'
signed_value = signed.sign(value)
transforms = (
lambda s: s.upper(),
lambda s: s + 'a',
lambda s: 'a' + s[1:],
lambda s: s.replace(':', ''),
)
self.assertEqual(value, signed.unsign(signed_value))
for transform in transforms:
self.assertRaises(signed.BadSignature, signed.unsign,
transform(signed_value))
def unsign_detects_tampering(self):
"unsign should raise an exception if the value has been tampered with"
value = 'Another string'
signed_value = signed.sign(value)
transforms = (
lambda s: s.upper(),
lambda s: s + 'a',
lambda s: 'a' + s[1:],
lambda s: s.replace(':', ''),
)
self.assertEqual(value, signed.unsign(signed_value))
for transform in transforms:
self.assertRaises(
signed.BadSignature, signed.unsign, transform(signed_value)
)
