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'''Tests block operations.'''
from StringIO import StringIO
import unittest
import rsa
from rsa import bigfile, varblock
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()
bigfile.encrypt_bigfile(infile, outfile, pub_key)
# Test
crypto = outfile.getvalue()
cryptfile = StringIO(crypto)
clearfile = StringIO()
bigfile.decrypt_bigfile(cryptfile, clearfile, priv_key)
self.assertEquals(clearfile.getvalue(), message)
# We have 2x6 bytes in the message, so that should result in two
# bigfile.
cryptfile.seek(0)
varblocks = list(varblock.yield_varblocks(cryptfile))
self.assertEqual(2, len(varblocks))
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