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import json
import os
import random
import string
import time
import unittest
import uuid
from azure.keyvault._internal import _bytes_to_int, _int_to_bytes, _int_to_bigendian_8_bytes, \
_bstr_to_b64url, _b64_to_bstr, _b64_to_str, _str_to_b64url, _a128cbc_hs256_decrypt, _a128cbc_hs256_encrypt, \
_RsaKey, _JwsHeader, _JweHeader
class EncodingTests(unittest.TestCase):
def test_int_byte_conversion(self):
# generate a random byte
b = os.urandom(1)
i = _bytes_to_int(b)
self._assert_bytes_significantly_equal(b, _int_to_bytes(i))
# generate a random number of random bytes
b = os.urandom(random.randint(1, 32))
i = _bytes_to_int(b)
self._assert_bytes_significantly_equal(b, _int_to_bytes(i))
# generate random 4096 bits (4k key)
b = os.urandom(512)
i = _bytes_to_int(b)
self._assert_bytes_significantly_equal(b, _int_to_bytes(i))
#
b = b'\x00\x00\x00\x01'
i = _bytes_to_int(b)
self._assert_bytes_significantly_equal(b, _int_to_bytes(i))
b = b''
with self.assertRaises(ValueError):
_bytes_to_int(b)
b = None
with self.assertRaises(ValueError):
_bytes_to_int(b)
def test_int_to_bigendian_8_bytes(self):
i = 0xFFFFFFFFFFFFFFFF
b = _int_to_bigendian_8_bytes(i)
self.assertEqual(b, b'\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF')
i = 0
b = _int_to_bigendian_8_bytes(i)
self.assertEqual(b, b'\x00\x00\x00\x00\x00\x00\x00\x00')
i = random.randint(1, 0xFFFFFFFFFFFFFFFF)
b = _int_to_bigendian_8_bytes(i)
self.assertEqual(len(b), 8)
self.assertEqual(i, _bytes_to_int(b))
i = random.randint(0xFFFFFFFFFFFFFFFF01, 0xFFFFFFFFFFFFFFFFFF)
with self.assertRaises(ValueError):
_int_to_bigendian_8_bytes(i)
def test_bstr_encode_decode(self):
b = b''
b64 = _bstr_to_b64url(b)
self.assertEqual(b, _b64_to_bstr(b64))
b = os.urandom(1)
b64 = _bstr_to_b64url(b)
self.assertEqual(b, _b64_to_bstr(b64))
b = os.urandom(random.randint(2, 32))
b64 = _bstr_to_b64url(b)
self.assertEqual(b, _b64_to_bstr(b64))
b = os.urandom(512)
b64 = _bstr_to_b64url(b)
self.assertEqual(b, _b64_to_bstr(b64))
def test_str_encode_decode(self):
s = ''
b64 = _str_to_b64url(s)
self.assertEqual(s, _b64_to_str(b64))
s = self._random_str(1)
b64 = _str_to_b64url(s)
self.assertEqual(s, _b64_to_str(b64))
s = self._random_str(random.randint(2, 32))
b64 = _str_to_b64url(s)
self.assertEqual(s, _b64_to_str(b64))
s = self._random_str(4096)
b64 = _str_to_b64url(s)
self.assertEqual(s, _b64_to_str(b64))
def test_a128cbc_hs256_encrypt_decrypt(self):
key = os.urandom(32)
iv = os.urandom(16)
plain_text = os.urandom(random.randint(1024, 4096))
auth_data = os.urandom(random.randint(128, 512))
cipher_text, auth_tag = _a128cbc_hs256_encrypt(key, iv, plain_text, auth_data)
self.assertEqual(plain_text, _a128cbc_hs256_decrypt(key, iv, cipher_text, auth_data, auth_tag))
def test_a128cbc_hs256_encrypt_error(self):
key = os.urandom(32)
iv = os.urandom(16)
plain_text = os.urandom(random.randint(1024, 4096))
auth_data = os.urandom(random.randint(128, 512))
with self.assertRaises(ValueError):
# key not specified
_a128cbc_hs256_encrypt(key=None, iv=iv, plaintext=plain_text, authdata=auth_data)
_a128cbc_hs256_encrypt(key=b'', iv=iv, plaintext=plain_text, authdata=auth_data)
# key insufficient len
_a128cbc_hs256_encrypt(key=os.urandom(31), iv=iv, plaintext=plain_text, authdata=auth_data)
# iv not specified
_a128cbc_hs256_encrypt(key=key, iv=None, plaintext=plain_text, authdata=auth_data)
_a128cbc_hs256_encrypt(key=key, iv=b'', plaintext=plain_text, authdata=auth_data)
# iv incorrect len
_a128cbc_hs256_encrypt(key=key, iv=os.urandom(15), plaintext=plain_text, authdata=auth_data)
_a128cbc_hs256_encrypt(key=key, iv=os.urandom(17), plaintext=plain_text, authdata=auth_data)
# plaintext not specified
_a128cbc_hs256_encrypt(key=key, iv=iv, plaintext=None, authdata=auth_data)
_a128cbc_hs256_encrypt(key=key, iv=iv, plaintext=b'', authdata=auth_data)
# authdata not specified
_a128cbc_hs256_encrypt(key=key, iv=iv, plaintext=plain_text, authdata=None)
_a128cbc_hs256_encrypt(key=key, iv=iv, plaintext=plain_text, authdata=b'')
def test_a128cbc_hs256_decrypt_error(self):
key = os.urandom(32)
iv = os.urandom(16)
cipher_text = os.urandom(random.randint(1024, 4096))
auth_data = os.urandom(random.randint(128, 512))
auth_tag = os.urandom(16)
with self.assertRaises(ValueError):
# key not specified
_a128cbc_hs256_decrypt(key=None, iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
_a128cbc_hs256_decrypt(key=b'', iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
# key insufficient len
_a128cbc_hs256_decrypt(key=os.urandom(31), iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
# iv not specified
_a128cbc_hs256_decrypt(key=key, iv=None, ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
_a128cbc_hs256_decrypt(key=key, iv=b'', ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
# iv incorrect len
_a128cbc_hs256_decrypt(key=key, iv=os.urandom(15), ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
_a128cbc_hs256_decrypt(key=key, iv=os.urandom(17), ciphertext=cipher_text, authdata=auth_data, authtag=auth_tag)
# ciphertext not specified
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=None, authdata=auth_data, authtag=auth_tag)
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=b'', authdata=auth_data, authtag=auth_tag)
# authdata not specified
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=cipher_text, authdata=None, authtag=auth_tag)
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=cipher_text, authdata=b'', authtag=auth_tag)
# authtag not specified
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=None)
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=b'')
# authtag invalid len
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=os.urandom(17))
_a128cbc_hs256_decrypt(key=key, iv=iv, ciphertext=cipher_text, authdata=auth_data, authtag=os.urandom(15))
def test_private_rsakey_to_from_jwk(self):
# create a key1 export to jwk and import as key2
key1 = _RsaKey.generate()
jwk = key1.to_jwk(include_private=True)
key2 = _RsaKey.from_jwk(jwk)
# validate that key2 is a private key
self.assertTrue(key2.is_private_key())
# validate that key2 can encrypt and decrypt properly
unwrapped = os.urandom(32)
wrapped = key1.encrypt(unwrapped)
self.assertEqual(unwrapped, key2.decrypt(wrapped))
wrapped = key2.encrypt(unwrapped)
self.assertEqual(unwrapped, key1.decrypt(wrapped))
# validate that key2 can sign and verify properly
data = os.urandom(random.randint(1024, 4096))
signature = key1.sign(data)
key2.verify(signature, data)
signature = key2.sign(data)
key1.verify(signature, data)
# validate that all numbers, both public and private are consistent
self.assertEqual(key1.kid, key2.kid)
self.assertEqual(key1.kty, key2.kty)
self.assertEqual(key1.key_ops, key2.key_ops)
self.assertEqual(key1.n, key2.n)
self.assertEqual(key1.e, key2.e)
self.assertEqual(key1.q, key2.q)
self.assertEqual(key1.p, key2.p)
self.assertEqual(key1.d, key2.d)
self.assertEqual(key1.dq, key2.dq)
self.assertEqual(key1.dp, key2.dp)
self.assertEqual(key1.qi, key2.qi)
# validate that key2 serializes to the same jwk
self.assertEqual(json.dumps(jwk.serialize()), json.dumps(key2.to_jwk(include_private=True).serialize()))
def test_public_rsakey_to_from_jwk(self):
# create key1 export public components and import as key2
key1 = _RsaKey.generate()
jwk = key1.to_jwk()
key2 = _RsaKey.from_jwk(jwk)
# validate that key2 is not a private key
self.assertFalse(key2.is_private_key())
# validate that key2 can encrypt properly
unwrapped = os.urandom(32)
wrapped = key2.encrypt(unwrapped)
self.assertEqual(unwrapped, key1.decrypt(wrapped))
# validate that key2 can verify properly
data = os.urandom(random.randint(1024, 4096))
signature = key1.sign(data)
key2.verify(signature, data)
# validate that all public numbers consistent
self.assertEqual(key1.kid, key2.kid)
self.assertEqual(key1.kty, key2.kty)
self.assertEqual(key1.n, key2.n)
self.assertEqual(key1.e, key2.e)
# validate that all private numbers are not present
self.assertIsNone(key2.q)
self.assertIsNone(key2.p)
self.assertIsNone(key2.d)
self.assertIsNone(key2.dq)
self.assertIsNone(key2.dp)
self.assertIsNone(key2.qi)
# validate that key2 serializes to the same public jwk
self.assertEqual(json.dumps(jwk.serialize()), json.dumps(key2.to_jwk().serialize()))
def test_jws_header_to_from_compact_header(self):
head1 = _JwsHeader()
head1.alg = 'RS256'
head1.kid = str(uuid.uuid4())
head1.at = self._random_str(random.randint(512, 1024))
head1.ts = int(time.time())
head1.typ = 'PoP'
compact = head1.to_compact_header()
head2 = _JwsHeader.from_compact_header(compact)
# assert that all header values match
self.assertEqual(head1.alg, head2.alg)
self.assertEqual(head1.kid, head2.kid)
self.assertEqual(head1.at, head2.at)
self.assertEqual(head1.ts, head2.ts)
self.assertEqual(head1.typ, head2.typ)
def test_jwe_header_to_from_compact_header(self):
head1 = _JweHeader()
head1.alg = 'RSA-OAEP'
head1.kid = str(uuid.uuid4())
head1.enc = 'A128CBC-HS256'
compact = head1.to_compact_header()
head2 = _JweHeader.from_compact_header(compact)
# assert that all header values match
self.assertEqual(head1.alg, head2.alg)
self.assertEqual(head1.kid, head2.kid)
self.assertEqual(head1.enc, head2.enc)
def _random_str(self, length):
return ''.join(random.choice(string.printable) for i in range(length))
def _assert_bytes_significantly_equal(self, b1, b2):
self.assertEqual(b1.lstrip(b'\x00'), b2.lstrip(b'\x00'))
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