Python3 Encoding compatibility with Python2.713.06.23

Encryption and Decode example what encode the encrypted text into base64
It can cause compatibility issues from python2 to python3.
Example what can receive python2 encoded crypt text and decrypt and en/decode

```python
#!/usr/bin/env python
from rijndael2 import Rijndael
import rijndael 
import base64
from Crypto.Cipher import AES
import binascii
KEY_SIZE = 16
BLOCK_SIZE = 32
KEY = '1234567890123456'

class R3(object):
  def __init__(self, base_directory):
    pass

def encrypt2(self, plaintext):
    padded_key = KEY.ljust(KEY_SIZE, '\0')
    padded_text = plaintext + (BLOCK_SIZE - len(plaintext) % BLOCK_SIZE) * '\0'
    r = Rijndael(padded_key, block_size = BLOCK_SIZE)
    ct = ''
    for start in range(0, len(padded_text), BLOCK_SIZE):
      p = padded_text[start:start+BLOCK_SIZE]
      c = r.encrypt(p)
      ct += c
    b = bytes(ct, encoding="raw_unicode_escape")
    encoded = base64.b64encode(b)
    return encoded.decode("utf-8")
  
  def decrypt2(self,encoded):
    padded_key = KEY.ljust(KEY_SIZE, '\0')
    ctx = base64.b64decode(encoded)
    ct = ''
    for i in ctx:
      ct += chr(i)
    r = Rijndael(padded_key, block_size = BLOCK_SIZE)
    padded_text = ''
    for start in range(0, len(ct), BLOCK_SIZE):
      padded_text += r.decrypt(ct[start:start+BLOCK_SIZE])
        
    plaintext = padded_text.split('\x00', 1)[0]
    return plaintext

if __name__ == '__main__':
    r = R3("a")
    x = r.encrypt2("hello")
    y = r.decrypt2(x)    
    print(y)

```

https://stackoverflow.com/questions/7585435/best-way-to-convert-string-to-bytes-in-python-3

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Python3 Encoding compatibility with Python2.713.06.23

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