adds Des3 wrappers

setup.py

@@ -26,5 +26,8 @@ setup(
     packages=find_packages(),
     setup_requires=["cffi>=1.5.2"],
     install_requires=["cffi>=1.5.2"],
-    cffi_modules=["./wolfcrypt/build_hashes.py:ffi"],
+    cffi_modules=[
+        #"./wolfcrypt/build_hashes.py:ffi",
+        "./wolfcrypt/build_ciphers.py:ffi"
+    ],
 )

wolfcrypt/build_ciphers.py

@@ -0,0 +1,52 @@
+# buidl_ciphers.py
+#
+# Copyright (C) 2006-2016 wolfSSL Inc.
+#
+# This file is part of wolfSSL. (formerly known as CyaSSL)
+#
+# wolfSSL is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# wolfSSL is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+import os
+
+from cffi import FFI
+
+ffi = FFI()
+
+ffi.set_source("wolfcrypt._ciphers",
+    """
+        #include <wolfssl/options.h>
+        #include <wolfssl/wolfcrypt/des3.h>
+    """,
+    include_dirs=["/usr/local/include"],
+    library_dirs=["/usr/local/lib"],
+    libraries=["wolfssl"],
+)
+
+ffi.cdef(
+"""
+
+    typedef unsigned char byte;
+    typedef unsigned int  word32;
+
+    typedef struct { ...; } Des3;
+
+    int wc_Des3_SetKey(Des3* des, const byte* key, const byte* iv,int dir);
+    int wc_Des3_CbcEncrypt(Des3* des, byte* out, const byte* in,word32 sz);
+    int wc_Des3_CbcDecrypt(Des3* des, byte* out, const byte* in,word32 sz);
+
+"""
+)
+
+if __name__ == "__main__":
+    ffi.compile(verbose=1)

wolfcrypt/build_hashes.py

@@ -1,3 +1,22 @@
+# build_hashes.py
+#
+# Copyright (C) 2006-2016 wolfSSL Inc.
+#
+# This file is part of wolfSSL. (formerly known as CyaSSL)
+#
+# wolfSSL is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# wolfSSL is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 import os
 
 from cffi import FFI

wolfcrypt/ciphers.py

@@ -0,0 +1,108 @@
+# ciphers.py
+#
+# Copyright (C) 2006-2016 wolfSSL Inc.
+#
+# This file is part of wolfSSL. (formerly known as CyaSSL)
+#
+# wolfSSL is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# wolfSSL is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+from wolfcrypt._ciphers import ffi
+from wolfcrypt._ciphers import lib
+
+MODE_ECB = 1 # Electronic Code Book
+MODE_CBC = 2 # Cipher Block Chaining
+MODE_CFB = 3 # Cipher Feedback
+MODE_OFB = 5 # Output Feedback
+MODE_CTR = 6 # Counter
+
+class Cipher(object):
+    # Magic object that protects against constructors.
+    _JAPANESE_CYBER_SWORD = object()
+
+
+    def __init__(self, token=""):
+        if token is not self._JAPANESE_CYBER_SWORD:
+            # PEP 272 -- API for Block Encryption Algorithms v1.0
+            raise ValueError("don't construct directly, use new([string])")
+
+
+    @classmethod
+    def new(cls, key, mode, IV=None, **kwargs):
+        if mode != MODE_CBC:
+            raise ValueError("this mode is not supported by this cipher")
+
+        obj = cls(Cipher._JAPANESE_CYBER_SWORD)
+
+        if len(key) != obj.key_size:
+            raise ValueError("key must be %d in length" % obj.key_size)
+
+        if IV is not None and len(IV) != obj.block_size:
+            raise ValueError("IV must be %d in length" % obj.block_size)
+
+        obj._native_object = ffi.new(obj._native_type)
+
+        obj._key = key
+        obj._IV  = IV
+
+        return obj
+
+
+    def encrypt(self, string):
+        if not string or len(string) % self.block_size:
+            raise ValueError(
+                "string must be a multiple of %d in length" % self.block_size)
+
+        cipher = ffi.new(self._native_type)
+        ret    = "\0" * len(string)
+
+        self._set_key(cipher, self._ENCRYPTION)
+        self._encrypt(cipher, ret, string)
+
+        return ret
+
+
+    def decrypt(self, string):
+        if not string or len(string) % self.block_size:
+            raise ValueError(
+                "string must be a multiple of %d in length" % self.block_size)
+
+        cipher = ffi.new(self._native_type)
+        ret    = "\0" * len(string)
+
+        self._set_key(cipher, self._DECRYPTION)
+        self._decrypt(cipher, ret, string)
+
+        return ret
+
+
+class Des3(Cipher):
+    key_size     = 24
+    block_size   = 8
+    _native_type = "Des3 *"
+
+    # key direction flags
+    _ENCRYPTION  = 0
+    _DECRYPTION  = 1
+
+
+    def _set_key(self, native_object, direction):
+        lib.wc_Des3_SetKey(native_object, self._key, self._IV, direction)
+
+
+    def _encrypt(self, native_object, destination, source):
+        lib.wc_Des3_CbcEncrypt(native_object, destination, source, len(source))
+
+
+    def _decrypt(self, native_object, destination, source):
+        lib.wc_Des3_CbcDecrypt(native_object, destination, source, len(source))