components/python/keystonemiddleware/patches/nopycrypto.patch
author Devjani Ray <devjani.ray@oracle.com>
Fri, 05 Feb 2016 17:54:17 -0500
changeset 5405 66fd59fecd68
parent 3998 5bd484384122
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In-house removal of PyCrypto dependency in keystonemiddleware. This
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patch is Solaris-specific and not suitable for upstream.
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--- keystonemiddleware-1.5.0/keystonemiddleware/auth_token/_memcache_crypt.py.~1~	2015-03-11 11:41:14.000000000 -0600
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+++ keystonemiddleware-1.5.0/keystonemiddleware/auth_token/_memcache_crypt.py	2015-04-27 17:30:54.664848743 -0600
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@@ -17,7 +17,7 @@
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 Utilities for memcache encryption and integrity check.
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 Data should be serialized before entering these functions. Encryption
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-has a dependency on the pycrypto. If pycrypto is not available,
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+has a dependency on M2Crypto. If M2Crypto is not available,
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 CryptoUnavailableError will be raised.
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 This module will not be called unless signing or encryption is enabled
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@@ -38,9 +38,10 @@ import sys
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 from keystonemiddleware.i18n import _
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-# make sure pycrypto is available
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+# make sure M2Crypto is available
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 try:
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-    from Crypto.Cipher import AES
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+    from M2Crypto.EVP import Cipher
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+    AES = Cipher
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 except ImportError:
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     AES = None
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@@ -73,6 +74,13 @@ class CryptoUnavailableError(Exception):
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     pass
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+class InvalidKeyLength(Exception):
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+    """raise when AES key length is an invalid value.
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+
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+    """
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+    pass
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+
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+
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 def assert_crypto_availability(f):
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     """Ensure Crypto module is available."""
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@@ -132,31 +140,44 @@ def sign_data(key, data):
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     return base64.b64encode(mac)
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+def _key_to_alg(key):
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+    """Return a M2Crypto-compatible AES-CBC algorithm name given a key."""
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+    aes_algs = {
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+        128: 'aes_128_cbc',
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+        192: 'aes_192_cbc',
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+        256: 'aes_256_cbc'
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+    }
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+
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+    keylen = 8 * len(key)
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+    if keylen not in aes_algs:
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+        msg = ('Invalid AES key length, %d bits') % keylen
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+        raise InvalidKeyLength(msg)
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+    return aes_algs[keylen]
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+
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+
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 @assert_crypto_availability
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 def encrypt_data(key, data):
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     """Encrypt the data with the given secret key.
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-    Padding is n bytes of the value n, where 1 <= n <= blocksize.
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     """
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     iv = os.urandom(16)
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-    cipher = AES.new(key, AES.MODE_CBC, iv)
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-    padding = 16 - len(data) % 16
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-    return iv + cipher.encrypt(data + six.int2byte(padding) * padding)
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+    cipher = Cipher(alg=_key_to_alg(key), key=key, iv=iv, op=1)
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+    result = cipher.update(data)
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+    return iv + result + cipher.final()
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 @assert_crypto_availability
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 def decrypt_data(key, data):
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     """Decrypt the data with the given secret key."""
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     iv = data[:16]
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-    cipher = AES.new(key, AES.MODE_CBC, iv)
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+    cipher = Cipher(alg=_key_to_alg(key), key=key, iv=iv, op=0)
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     try:
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-        result = cipher.decrypt(data[16:])
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+        result = cipher.update(data[16:])
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+        result = result + cipher.final()
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     except Exception:
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         raise DecryptError(_('Encrypted data appears to be corrupted.'))
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-    # Strip the last n padding bytes where n is the last value in
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-    # the plaintext
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-    return result[:-1 * six.byte2int([result[-1]])]
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+    return result
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 def protect_data(keys, data):