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'''Tests block operations.'''
from rsa._compat import b
try:
from StringIO import StringIO as BytesIO
except ImportError:
from io import BytesIO
import unittest2
import rsa
from rsa import bigfile, varblock, pkcs1
class BigfileTest(unittest2.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 = b('123456Sybren')
infile = BytesIO(message)
outfile = BytesIO()
bigfile.encrypt_bigfile(infile, outfile, pub_key)
# Test
crypto = outfile.getvalue()
cryptfile = BytesIO(crypto)
clearfile = BytesIO()
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))
def test_sign_verify_bigfile(self):
# Large enough to store MD5-sum and ASN.1 code for MD5
pub_key, priv_key = rsa.newkeys((34 + 11) * 8)
# Sign the file
msgfile = BytesIO(b('123456Sybren'))
signature = pkcs1.sign(msgfile, priv_key, 'MD5')
# Check the signature
msgfile.seek(0)
self.assertTrue(pkcs1.verify(msgfile, signature, pub_key))
# Alter the message, re-check
msgfile = BytesIO(b('123456sybren'))
self.assertRaises(pkcs1.VerificationError,
pkcs1.verify, msgfile, signature, pub_key)
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