Nosalt AES encryption in Python

echo "this is secret"|openssl enc -aes-256-cbc -e -base64 -pass pass:hogehoge -p -nosalt

def encryptAes(str, encKey, key_length=32, iv_length=16):
    d = d_i = ''
    while len(d) < key_length + iv_length:
        d_i = md5(d_i + encKey).digest()
        d += d_i
    key = d[:key_length]
    iv = d[key_length:key_length+iv_length]
    cipher = AES.new(key, AES.MODE_CBC, iv)
    _str = str + (iv_length - len(str) % iv_length) * chr(iv_length - len(str) % iv_length)
    return base64.b16encode(cipher.encrypt(_str)).lower()
print encyptAes("this is secret","hogehoge")

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