# -*- coding: utf-8 -*-

# pip install pycryptodome

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex

AES_LENGTH = 16


class Crypto():
    def __init__(self, key):
        self.key = key
        self.mode = AES.MODE_ECB
        self.cryptor = AES.new(self.pad_key(self.key).encode(), self.mode)

    # 加密文本text必须为16的倍数，补足为16的倍数
    def pad(self, text):
        while len(text) % AES_LENGTH != 0:
            text += '\0'
        return text

    # 加密密钥需要长达16位字符，所以进行空格拼接
    def pad_key(self,key):
        while len(key) % AES_LENGTH != 0:
            key += '\0'
        return key

    # 加密
    def encrypt(self, text):
        try:
            # 这里密钥key 长度必须为16（AES-128）、24（AES-192）、或32（AES-256）Bytes 长度.目前AES-128足够用
            # 加密的字符需要转换为bytes
            self.ciphertext = self.cryptor.encrypt(self.pad(text).encode())

            # 因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
            # 所以这里统一把加密后的字符串转化为16进制字符串
            return b2a_hex(self.ciphertext)
        except Exception as e:
            return e

    # 解密
    def decrypt(self, text):
        try:
            plain_text = self.cryptor.decrypt(a2b_hex(text)).decode()
            return plain_text.rstrip('\0')
        except Exception as e:
            return  e


if __name__ == '__main__':
    pc = Crypto('kingsome')  # 初始化密钥
    e = pc.encrypt("123456")
    d = pc.decrypt(e)
    print(e, d)