encryption

import hashlib
from Crypto.Cipher import AES
def encrypt_file(key, dir, file, out_filename, chunksize=64*1024):
        iv = str(binascii.b2a_hex(os.urandom(15)))[:16]
        encryptor = AES.new(key, AES.MODE_CBC, iv)
        in_filename = dir+file
        filesize = os.path.getsize(in_filename)
        with open(in_filename, 'rb') as infile:
            with open(out_filename, 'wb') as outfile:
                outfile.write(struct.pack('<Q', filesize))
                outfile.write(iv)
                while True:
                    chunk = infile.read(chunksize)
                    if len(chunk) == 0:
                        break
                    elif len(chunk) % 16 != 0:
                        chunk += ' ' * (16 - len(chunk) % 16)
                    outfile.write(encryptor.encrypt(chunk))

def genMD5pass(passwd):
    m = hashlib.md5()
    m.update(passwd)
    passwd = m.hexdigest()
    return passwd