python aes encryption

from Crypto.Cipher import AES import binascii,os import random, string iv = os.urandom(16) aes_mode = AES.MODE_CBC key = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(16)) print(key) encryptor = AES.new(key, aes_mode, iv) def aes_encrypt(plaintext): plaintext = convert_to_16(plaintext) ciphertext = encryptor.encrypt(plaintext) return ciphertext def convert_to_16(plaintext): #Overcome the drawback of plaintxt size which should be multiple of len(iv) add = 16 - (len(plaintext) % 16) return(plaintext + ' ' * add) Encrypted = aes_encrypt('Jaisal ') print("Encrypted message :",Encrypted)

>>> from Crypto.Cipher import AES >>> >>> key = b'Sixteen byte key' >>> cipher = AES.new(key, AES.MODE_EAX, nonce=nonce) >>> plaintext = cipher.decrypt(ciphertext) >>> try: >>> cipher.verify(tag) >>> print("The message is authentic:", plaintext) >>> except ValueError: >>> print("Key incorrect or message corrupted")

import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES

class AESCipher(object):

    def __init__(self, key): 
        self.bs = AES.block_size
        self.key = hashlib.sha256(key.encode()).digest()

    def encrypt(self, raw):
        raw = self._pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return base64.b64encode(iv + cipher.encrypt(raw.encode()))

    def decrypt(self, enc):
        enc = base64.b64decode(enc)
        iv = enc[:AES.block_size]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return self._unpad(cipher.decrypt(enc[AES.block_size:])).decode('utf-8')

    def _pad(self, s):
        return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)

    @staticmethod
    def _unpad(s):
        return s[:-ord(s[len(s)-1:])]

Posted by: Guest on October-26-2021

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