using PyCrypto for 3DES

des3.py

from Crypto.Cipher import DES3

def _make_des3_encryptor(key, iv):
    encryptor = DES3.new(key, DES3.MODE_CBC, iv)
    return encryptor


def des3_encrypt(key, iv, data):
    encryptor = _make_des3_encryptor(key, iv)
    pad_len = 8 - len(data) % 8 # length of padding
    padding = chr(pad_len) * pad_len # PKCS5 padding content
    data += padding
    return encryptor.encrypt(data)


def des3_decrypt(key, iv, data):
    encryptor = _make_des3_encryptor(key, iv)
    result = encryptor.decrypt(data)
    pad_len = ord(result[-1])
    result = result[:-pad_len]
    return result

Hey xuecan, when I encrypt and decrypt in one run the code works but when encrypt in one run and getting a encrypted string and then that encrypted string inputs into decrypt function then it can't decrypt properly the string. Have you idea about that how to encrypt and decrypt in different runs?