python blowfish cfb

#!/usr/bin/python

import socket, ctypes

library = ctypes.cdll.LoadLibrary('/lib/libcrypto.so.0.9.8')
context = ctypes.create_string_buffer(1024)
library.EVP_CIPHER_CTX_init(context)
blowfish = library.EVP_bf_cfb
blowfish.restype = ctypes.c_void_p
blowfish = ctypes.c_void_p(blowfish())

def encrypt(key, iv, message):
    library.EVP_EncryptInit_ex(context, blowfish, None, key, iv)
    inl = len(message)
    outl = ctypes.c_int(inl)
    out = ctypes.create_string_buffer(inl)
    library.EVP_EncryptUpdate(context, out, ctypes.byref(outl), message, inl)
    return out.raw

def decrypt(key, iv, message):
    library.EVP_DecryptInit_ex(context, blowfish, None, key, iv)
    inl = len(message)
    outl = ctypes.c_int(inl)
    out = ctypes.create_string_buffer(inl)
    library.EVP_DecryptUpdate(context, out, ctypes.byref(outl), message, inl)
    return out.raw

key, iv = '1234567890ABCDEF', '12345678'
a = encrypt(key, iv, 'hello')
b = decrypt(key, iv, a)
print b