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import pytest
from sqlalchemy_utils.types.encrypted.padding import (
InvalidPaddingError,
PKCS5Padding
)
class TestPkcs5Padding:
def setup_method(self):
self.BLOCK_SIZE = 8
self.padder = PKCS5Padding(self.BLOCK_SIZE)
def test_various_lengths_roundtrip(self):
for number in range(0, 3 * self.BLOCK_SIZE):
val = b'*' * number
padded = self.padder.pad(val)
unpadded = self.padder.unpad(padded)
assert val == unpadded, 'Round trip error for length %d' % number
def test_invalid_unpad(self):
with pytest.raises(InvalidPaddingError):
self.padder.unpad(None)
with pytest.raises(InvalidPaddingError):
self.padder.unpad(b'')
with pytest.raises(InvalidPaddingError):
self.padder.unpad(b'\01')
with pytest.raises(InvalidPaddingError):
self.padder.unpad((b'*' * (self.BLOCK_SIZE - 1)) + b'\00')
with pytest.raises(InvalidPaddingError):
self.padder.unpad((b'*' * self.BLOCK_SIZE) + b'\01')
def test_pad_longer_than_block(self):
with pytest.raises(InvalidPaddingError):
self.padder.unpad(
'x' * (self.BLOCK_SIZE - 1) +
chr(self.BLOCK_SIZE + 1) * (self.BLOCK_SIZE + 1)
)
def test_incorrect_padding(self):
# Hard-coded for blocksize of 8
assert self.padder.unpad(b'1234\04\04\04\04') == b'1234'
with pytest.raises(InvalidPaddingError):
self.padder.unpad(b'1234\02\04\04\04')
with pytest.raises(InvalidPaddingError):
self.padder.unpad(b'1234\04\02\04\04')
with pytest.raises(InvalidPaddingError):
self.padder.unpad(b'1234\04\04\02\04')
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