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'''Tests block operations.'''
from StringIO import StringIO
import unittest
import rsa
from rsa import blocks
class VarintTest(unittest.TestCase):
def test_read_varint(self):
encoded = '\xac\x02crummy'
infile = StringIO(encoded)
(decoded, read) = blocks.read_varint(infile)
# Test the returned values
self.assertEqual(300, decoded)
self.assertEqual(2, read)
# The rest of the file should be untouched
self.assertEqual('crummy', infile.read())
def test_read_zero(self):
encoded = '\x00crummy'
infile = StringIO(encoded)
(decoded, read) = blocks.read_varint(infile)
# Test the returned values
self.assertEqual(0, decoded)
self.assertEqual(1, read)
# The rest of the file should be untouched
self.assertEqual('crummy', infile.read())
def test_write_varint(self):
expected = '\xac\x02'
outfile = StringIO()
written = blocks.write_varint(outfile, 300)
# Test the returned values
self.assertEqual(expected, outfile.getvalue())
self.assertEqual(2, written)
def test_write_zero(self):
outfile = StringIO()
written = blocks.write_varint(outfile, 0)
# Test the returned values
self.assertEqual('\x00', outfile.getvalue())
self.assertEqual(1, written)
class VarblockTest(unittest.TestCase):
def test_yield_varblock(self):
infile = StringIO('\x01\x0512345\x06Sybren')
varblocks = list(blocks.yield_varblocks(infile))
self.assertEqual(['12345', 'Sybren'], varblocks)
class FixedblockTest(unittest.TestCase):
def test_yield_fixedblock(self):
infile = StringIO('123456Sybren')
fixedblocks = list(blocks.yield_fixedblocks(infile, 6))
self.assertEqual(['123456', 'Sybren'], fixedblocks)
class BigfileTest(unittest.TestCase):
def test_encrypt_decrypt_bigfile(self):
# Expected block size + 11 bytes padding
pub_key, priv_key = rsa.newkeys((6 + 11) * 8)
# Encrypt the file
message = '123456Sybren'
infile = StringIO(message)
outfile = StringIO()
blocks.encrypt_bigfile(infile, outfile, pub_key)
# Test
crypto = outfile.getvalue()
cryptfile = StringIO(crypto)
clearfile = StringIO()
blocks.decrypt_bigfile(cryptfile, clearfile, priv_key)
self.assertEquals(clearfile.getvalue(), message)
# We have 2x6 bytes in the message, so that should result in two
# blocks.
cryptfile.seek(0)
varblocks = list(blocks.yield_varblocks(cryptfile))
self.assertEqual(2, len(varblocks))
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