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#! /usr/bin/python
import unittest
from curve25519 import Private, Public
from hashlib import sha1, sha256
from binascii import hexlify
class Basic(unittest.TestCase):
def test_basic(self):
secret1 = b"abcdefghijklmnopqrstuvwxyz123456"
self.assertEqual(len(secret1), 32)
secret2 = b"654321zyxwvutsrqponmlkjihgfedcba"
self.assertEqual(len(secret2), 32)
priv1 = Private(secret=secret1)
pub1 = priv1.get_public()
priv2 = Private(secret=secret2)
pub2 = priv2.get_public()
shared12 = priv1.get_shared_key(pub2)
e = b"b0818125eab42a8ac1af5e8b9b9c15ed2605c2bbe9675de89e5e6e7f442b9598"
self.assertEqual(hexlify(shared12), e)
shared21 = priv2.get_shared_key(pub1)
self.assertEqual(shared12, shared21)
pub2a = Public(pub2.serialize())
shared12a = priv1.get_shared_key(pub2a)
self.assertEqual(hexlify(shared12a), e)
def test_errors(self):
priv1 = Private()
self.assertRaises(ValueError, priv1.get_shared_key, priv1)
def test_seed(self):
# use 32-byte secret
self.assertRaises(TypeError, Private, secret=123)
self.assertRaises(TypeError, Private, secret=b"too short")
secret1 = b"abcdefghijklmnopqrstuvwxyz123456"
assert len(secret1) == 32
priv1 = Private(secret=secret1)
priv1a = Private(secret=secret1)
priv1b = Private(priv1.serialize())
self.assertEqual(priv1.serialize(), priv1a.serialize())
self.assertEqual(priv1.serialize(), priv1b.serialize())
e = b"6062636465666768696a6b6c6d6e6f707172737475767778797a313233343576"
self.assertEqual(hexlify(priv1.serialize()), e)
# the private key is a clamped form of the secret, so they won't
# quite be the same
p = Private(secret=b"\x00"*32)
self.assertEqual(hexlify(p.serialize()), b"00"*31+b"40")
p = Private(secret=b"\xff"*32)
self.assertEqual(hexlify(p.serialize()), b"f8"+b"ff"*30+b"7f")
# use arbitrary-length seed
self.assertRaises(TypeError, Private, seed=123)
priv1 = Private(seed=b"abc")
priv1a = Private(seed=b"abc")
priv1b = Private(priv1.serialize())
self.assertEqual(priv1.serialize(), priv1a.serialize())
self.assertEqual(priv1.serialize(), priv1b.serialize())
self.assertRaises(AssertionError, Private, seed=b"abc", secret=b"no")
priv1 = Private(seed=b"abc")
priv1a = Private(priv1.serialize())
self.assertEqual(priv1.serialize(), priv1a.serialize())
self.assertRaises(AssertionError, Private, seed=b"abc", secret=b"no")
# use built-in os.urandom
priv2 = Private()
priv2a = Private(priv2.private)
self.assertEqual(priv2.serialize(), priv2a.serialize())
# attempt to use both secret= and seed=, not allowed
self.assertRaises(AssertionError, Private, seed=b"abc", secret=b"no")
def test_hashfunc(self):
priv1 = Private(seed=b"abc")
priv2 = Private(seed=b"def")
shared_sha256 = priv1.get_shared_key(priv2.get_public())
e = b"da959ffe77ebeb4757fe5ba310e28ede425ae0d0ff5ec9c884e2d08f311cf5e5"
self.assertEqual(hexlify(shared_sha256), e)
# confirm the hash function remains what we think it is
def myhash(shared_key):
return sha256(b"curve25519-shared:"+shared_key).digest()
shared_myhash = priv1.get_shared_key(priv2.get_public(), myhash)
self.assertEqual(hexlify(shared_myhash), e)
def hexhash(shared_key):
return sha1(shared_key).hexdigest().encode()
shared_hexhash = priv1.get_shared_key(priv2.get_public(), hexhash)
self.assertEqual(shared_hexhash,
b"80eec98222c8edc4324fb9477a3c775ce7c6c93a")
if __name__ == "__main__":
unittest.main()
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