Python AES

Python

ksg97031 2014. 9. 15. 16:03

key는 16바이트 단위로 해야하며,

평문도 16바이트 크기로 '{'로 패딩된다.

from Crypto.Cipher import AES

key="a"*16

#key = b'\xbf\xc0\x85)\x10nc\x94\x02)j\xdf\xcb\xc4\x94\x9d(\x9e[EX\xc8\xd5\xbfI{\xa2$\x05(\xd5\x32'

message="keyiskey"*3

print (len(key))

#key = b'\xbf\xc0\x85)\x10nc\x94\x02)j\xdf\xcb\xc4\x94\x9d(\x9e[EX\xc8\xd5\xbfI{\xa2$\x05(\xd5\x18'

#message = "this is my super secret message"

cipher =AES.new(key)

def pad(s):

return s + ((16-len(s) %16)*'{')

def encrypt(plaintext):

global cipher, key

print (pad(plaintext))

return cipher.encrypt(pad(plaintext))

def decrypt(ciphertext):

global cipher

dec = cipher.decrypt(ciphertext).decode('utf-8')

l = dec.count('{')

return dec[:len(dec)-l]

print ("Message:",message)

encrypted = encrypt(message)

decrypted = decrypt(encrypted)

print("Encrypted:",encrypted)

print("Decrypted:",decrypted)