python - AES Encrypt / Decrypt

python 설치과정

https://www.microsoft.com/en-us/download/confirmation.aspx?id=44266 

설치 후 pip install pycrypto

# Python 2.7 - Encrypt

import base64
import hashlib
from Crypto.Cipher import AES

BS = AES.block_size
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[0:-ord(s[-1])]

key = "12345678901234567890123456789012"; # 32bit
iv=key[:16] # 16bit
String = 'abcd'

print 'Input string: ' + String

cipher = AES.new(key, AES.MODE_CBC, IV=iv)
String = pad(String)
afterCipher = base64.b64encode(cipher.encrypt(String))

print 'Cipher string: ' + afterCipher

=> 결과

 

# Python 2.7 - Decrypt

import base64
import hashlib
from Crypto.Cipher import AES

BS = AES.block_size
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[0:-ord(s[-1])]

key = "12345678901234567890123456789012"; # 32bit
iv=key[:16] # 16bit
Cipher = "nf2mDLb4L36PWlXz3mNPTw=="

cipher = AES.new(key, AES.MODE_CBC, IV=iv)
deciphed = cipher.decrypt(base64.b64decode(Cipher))
deciphed = unpad(deciphed)

print 'Deciphed string: [' + deciphed +']'

=> 결과