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#!/usr/bin/env python
"""Unit tests for M2Crypto.RSA.
Copyright (c) 2000 Ng Pheng Siong. All rights reserved."""
import unittest
import sha, md5
from M2Crypto import RSA, BIO, Rand, m2, EVP
class RSATestCase(unittest.TestCase):
errkey = 'dsa.priv.pem'
privkey = 'rsa.priv.pem'
privkey2 = 'rsa.priv2.pem'
pubkey = 'rsa.pub.pem'
data = sha.sha('The magic words are squeamish ossifrage.').digest()
e_padding_ok = ('pkcs1_padding', 'pkcs1_oaep_padding')
s_padding_ok = ('pkcs1_padding',)
s_padding_nok = ('no_padding', 'sslv23_padding', 'pkcs1_oaep_padding')
def gen_callback(self, *args):
pass
def gen2_callback(self):
pass
def pp_callback(self, *args):
# The passphrase for rsa.priv2.pem is 'qwerty'.
return 'qwerty'
def pp2_callback(self, *args):
# Misbehaving passphrase callback.
pass
def check_loadkey_junk(self):
self.assertRaises(RSA.RSAError, RSA.load_key, self.errkey)
def check_loadkey_pp(self):
rsa = RSA.load_key(self.privkey2, self.pp_callback)
assert len(rsa) == 512
assert rsa.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
assert rsa.check_key() == 1
def check_loadkey_pp_bad_cb(self):
self.assertRaises(RSA.RSAError, RSA.load_key, self.privkey2, self.pp2_callback)
def check_loadkey(self):
rsa = RSA.load_key(self.privkey)
assert len(rsa) == 512
assert rsa.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
assert rsa.check_key() == 1
def check_loadkey_bio(self):
keybio = BIO.MemoryBuffer(open(self.privkey).read())
rsa = RSA.load_key_bio(keybio)
assert len(rsa) == 512
assert rsa.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
assert rsa.check_key() == 1
def check_keygen(self):
rsa = RSA.gen_key(256, 65537, self.gen_callback)
assert len(rsa) == 256
assert rsa.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
assert rsa.check_key() == 1
def check_keygen_bad_cb(self):
rsa = RSA.gen_key(256, 65537, self.gen2_callback)
assert len(rsa) == 256
assert rsa.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
assert rsa.check_key() == 1
def check_private_encrypt(self):
priv = RSA.load_key(self.privkey)
# pkcs1_padding
for padding in self.s_padding_ok:
p = getattr(RSA, padding)
ctxt = priv.private_encrypt(self.data, p)
ptxt = priv.public_decrypt(ctxt, p)
assert ptxt == self.data
# The other paddings.
for padding in self.s_padding_nok:
p = getattr(RSA, padding)
self.assertRaises(RSA.RSAError, priv.private_encrypt, self.data, p)
# Type-check the data to be encrypted.
self.assertRaises(TypeError, priv.private_encrypt, self.gen_callback, RSA.pkcs1_padding)
def check_public_encrypt(self):
priv = RSA.load_key(self.privkey)
# pkcs1_padding, pkcs1_oaep_padding
for padding in self.e_padding_ok:
p = getattr(RSA, padding)
ctxt = priv.public_encrypt(self.data, p)
ptxt = priv.private_decrypt(ctxt, p)
assert ptxt == self.data
# sslv23_padding
ctxt = priv.public_encrypt(self.data, RSA.sslv23_padding)
self.assertRaises(RSA.RSAError, priv.private_decrypt, ctxt, RSA.sslv23_padding)
# no_padding
self.assertRaises(RSA.RSAError, priv.public_encrypt, self.data, RSA.no_padding)
# Type-check the data to be encrypted.
self.assertRaises(TypeError, priv.public_encrypt, self.gen_callback, RSA.pkcs1_padding)
def check_loadpub(self):
rsa = RSA.load_pub_key(self.pubkey)
assert len(rsa) == 512
assert rsa.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
assert rsa.check_key()
def check_loadpub_bad(self):
self.assertRaises(RSA.RSAError, RSA.load_pub_key, self.errkey)
def check_set_bn(self):
rsa = RSA.load_pub_key(self.pubkey)
assert m2.rsa_set_e(rsa.rsa, '\000\000\000\003\001\000\001') is None
self.assertRaises(RSA.RSAError, m2.rsa_set_e, rsa.rsa, '\000\000\000\003\001')
def check_newpub(self):
old = RSA.load_pub_key(self.pubkey)
new = RSA.new_pub_key(old.pub())
assert new.check_key()
assert len(new) == 512
assert new.e == '\000\000\000\003\001\000\001' # aka 65537 aka 0xf4
def check_sign_and_verify(self):
"""
Testing signing and verifying digests
"""
algos = {'sha1':'',
'sha224':'',
'sha256':'',
'sha384':'',
'sha512':'',
'ripemd160':'',
'md5':''}
message = "This is the message string"
digest = sha.sha(message).digest()
rsa = RSA.load_key(self.privkey)
rsa2 = RSA.load_pub_key(self.pubkey)
for algo in algos.keys():
signature = rsa.sign(digest, algo)
#assert signature == algos[algo], 'mismatched signature with algorithm %s: signature=%s' % (algo, signature)
verify = rsa2.verify(digest, signature, algo)
assert verify == 1, 'verification failed with algorithm %s' % algo
def check_sign_bad_method(self):
"""
Testing calling sign with an unsupported message digest algorithm
"""
rsa = RSA.load_key(self.privkey)
message = "This is the message string"
digest = md5.md5(message).digest()
self.assertRaises(ValueError, rsa.sign,
digest, 'bad_digest_method')
def check_verify_bad_method(self):
"""
Testing calling verify with an unsupported message digest algorithm
"""
rsa = RSA.load_key(self.privkey)
message = "This is the message string"
digest = md5.md5(message).digest()
signature = rsa.sign(digest, 'sha1')
self.assertRaises(ValueError, rsa.verify,
digest, signature, 'bad_digest_method')
def check_verify_mismatched_algo(self):
"""
Testing verify to make sure it fails when we use a different
message digest algorithm
"""
rsa = RSA.load_key(self.privkey)
message = "This is the message string"
digest = sha.sha(message).digest()
signature = rsa.sign(digest, 'sha1')
rsa2 = RSA.load_pub_key(self.pubkey)
self.assertRaises(RSA.RSAError, rsa.verify,
digest, signature, 'md5')
def check_sign_fail(self):
"""
Testing sign to make sure it fails when I give it
a bogus digest. Looking at the RSA sign method
I discovered that with the digest methods we use
it has to be longer than a certain length.
"""
rsa = RSA.load_key(self.privkey)
digest = """This string should be long enough to warrant an error in
RSA_sign"""
self.assertRaises(RSA.RSAError, rsa.sign, digest)
def check_verify_bad_signature(self):
"""
Testing verify to make sure it fails when we use a bad signature
"""
rsa = RSA.load_key(self.privkey)
message = "This is the message string"
digest = sha.sha(message).digest()
otherMessage = "Abracadabra"
otherDigest = sha.sha(otherMessage).digest()
otherSignature = rsa.sign(otherDigest)
self.assertRaises(RSA.RSAError, rsa.verify,
digest, otherSignature)
def suite():
return unittest.makeSuite(RSATestCase, 'check')
if __name__ == '__main__':
Rand.load_file('randpool.dat', -1)
unittest.TextTestRunner().run(suite())
Rand.save_file('randpool.dat')
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