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#!/usr/bin/env python
# XXX memory leaks
"""
Unit tests for M2Crypto.EC, the curves
There are several ways one could unittest elliptical curves
but we are going to only validate that we are using the
OpenSSL curve and that it works with ECDSA. We will assume
OpenSSL has validated the curves themselves.
Also, some curves are shorter than a SHA-1 digest of 160
bits. To keep the testing simple, we will take advantage
of ECDSA's ability to sign any digest length and create a
digset string of only 48 bits. Remember we are testing our
ability to access the curve, not ECDSA itself.
Copyright (c) 2006 Larry Bugbee. All rights reserved.
"""
import logging
from M2Crypto import EC, Rand, m2 # noqa
from tests import unittest
log = logging.getLogger(__name__)
curves = {
"secp112r1": 112,
"secp112r2": 112,
"secp128r1": 128,
"secp128r2": 128,
"secp160k1": 160,
"secp160r1": 160,
"secp160r2": 160,
"secp192k1": 192,
"secp224k1": 224,
"secp224r1": 224,
"secp256k1": 256,
"secp384r1": 384,
"secp521r1": 521,
"sect113r1": 113,
"sect113r2": 113,
"sect131r1": 131,
"sect131r2": 131,
"sect163k1": 163,
"sect163r1": 163,
"sect163r2": 163,
"sect193r1": 193,
"sect193r2": 193,
"sect233k1": 233,
"sect233r1": 233,
"sect239k1": 239,
"sect283k1": 283,
"sect283r1": 283,
"sect409k1": 409,
"sect409r1": 409,
"sect571k1": 571,
"sect571r1": 571,
"X9_62_prime192v1": 192,
"X9_62_prime192v2": 192,
"X9_62_prime192v3": 192,
"X9_62_prime239v1": 239,
"X9_62_prime239v2": 239,
"X9_62_prime239v3": 239,
"X9_62_prime256v1": 256,
"X9_62_c2pnb163v1": 163,
"X9_62_c2pnb163v2": 163,
"X9_62_c2pnb163v3": 163,
"X9_62_c2pnb176v1": 176,
"X9_62_c2tnb191v1": 191,
"X9_62_c2tnb191v2": 191,
"X9_62_c2tnb191v3": 191,
"X9_62_c2pnb208w1": 208,
"X9_62_c2tnb239v1": 239,
"X9_62_c2tnb239v2": 239,
"X9_62_c2tnb239v3": 239,
"X9_62_c2pnb272w1": 272,
"X9_62_c2pnb304w1": 304,
"X9_62_c2tnb359v1": 359,
"X9_62_c2pnb368w1": 368,
"X9_62_c2tnb431r1": 431,
"wap_wsg_idm_ecid_wtls1": 113,
"wap_wsg_idm_ecid_wtls3": 163,
"wap_wsg_idm_ecid_wtls4": 113,
"wap_wsg_idm_ecid_wtls5": 163,
"wap_wsg_idm_ecid_wtls6": 112,
"wap_wsg_idm_ecid_wtls7": 160,
"wap_wsg_idm_ecid_wtls8": 112,
"wap_wsg_idm_ecid_wtls9": 160,
"wap_wsg_idm_ecid_wtls10": 233,
"wap_wsg_idm_ecid_wtls11": 233,
"wap_wsg_idm_ecid_wtls12": 224,
}
# The following two curves, according to OpenSSL, have a
# "Questionable extension field!" and are not supported by
# the OpenSSL inverse function. ECError: no inverse.
# As such they cannot be used for signing. They might,
# however, be usable for encryption but that has not
# been tested. Until thir usefulness can be established,
# they are not supported at this time.
# curves2 = [
# ('ipsec3', 155),
# ('ipsec4', 185),
# ]
def available_curves():
bc_dict = EC.get_builtin_curves()
bin_curves = set(x["sname"] for x in bc_dict)
out_curves = tuple(
(m2.obj_sn2nid(x[0]), x[1]) for x in curves if x[0] in bin_curves
)
return out_curves
# Seems like one of the most widely supported curves.
tested_curve = EC.NID_secp384r1, curves["secp384r1"]
class ECCurveTests(unittest.TestCase):
data = "digest"
def genkey(self, curve):
try:
curve_name = m2.obj_nid2sn(curve[0])
except TypeError:
# we have to throw different exception for compatibility
raise AttributeError("Unknown cipher %s", curve[0])
ec = EC.gen_params(curve[0])
self.assertEqual(len(ec), curve[1])
ec.gen_key()
self.assertTrue(
ec.check_key(),
'check_key() failure for "%s"' % curve_name,
)
return ec
def sign_verify_ecdsa(self, curve):
ec = self.genkey(curve)
r, s = ec.sign_dsa(self.data)
self.assertTrue(ec.verify_dsa(self.data, r, s))
self.assertFalse(ec.verify_dsa(self.data, s, r))
def test_ec_curves_ECDSA(self): # noqa
for curve in available_curves():
self.sign_verify_ecdsa(curve)
with self.assertRaises(AttributeError):
self.sign_verify_ecdsa(("nosuchcurve", 1))
def test_ec_get_builtin_curves(self):
curves = EC.get_builtin_curves()
self.assertNotEqual(curves, [])
self.assertIsNotNone(curves)
def suite():
suite = unittest.TestSuite()
suite.addTest(unittest.TestLoader().loadTestsFromTestCase(ECCurveTests))
return suite
if __name__ == "__main__":
Rand.load_file("randpool.dat", -1)
unittest.TextTestRunner().run(suite())
Rand.save_file("randpool.dat")
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