refactor encrypt; add cfb1 and cfb8 modes

shadowsocks/crypto/m2.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2014 clowwindy
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import sys
+import logging
+
+__all__ = ['ciphers']
+
+has_m2 = True
+try:
+    __import__('M2Crypto')
+except ImportError:
+    has_m2 = False
+
+
+def create_cipher(alg, key, iv, op, key_as_bytes=0, d=None, salt=None, i=1,
+                  padding=1):
+
+    import M2Crypto.EVP
+    return M2Crypto.EVP.Cipher('rc4', key, iv, op, key_as_bytes=0,
+                               d='md5', salt=None, i=1, padding=1)
+
+
+def err(alg, key, iv, op, key_as_bytes=0, d=None, salt=None, i=1, padding=1):
+    logging.error(('M2Crypto is required to use %s, please run'
+                   ' `apt-get install python-m2crypto`') % alg)
+    sys.exit(1)
+
+
+if not has_m2:
+    create_cipher = err
+
+ciphers = {
+    'aes-128-cfb': (16, 16, create_cipher),
+    'aes-192-cfb': (24, 16, create_cipher),
+    'aes-256-cfb': (32, 16, create_cipher),
+    'bf-cfb': (16, 8, create_cipher),
+    'camellia-128-cfb': (16, 16, create_cipher),
+    'camellia-192-cfb': (24, 16, create_cipher),
+    'camellia-256-cfb': (32, 16, create_cipher),
+    'cast5-cfb': (16, 8, create_cipher),
+    'des-cfb': (8, 8, create_cipher),
+    'idea-cfb': (16, 8, create_cipher),
+    'rc2-cfb': (16, 8, create_cipher),
+    'rc4': (16, 0, create_cipher),
+    'seed-cfb': (16, 16, create_cipher),
+}