Crypto 加密解密

 

 

import binascii
from Crypto.Cipher import AES
#秘鑰,此處需要將字符串轉為字節
from utils import config
from utils.env_operation import conf_parse

key = b'abcdefgh'
#加密內容需要長達16位字符，所以進行空格拼接
class crypt_util():
    def __init__(self):
        self.token = config.get_env('crypt_token').encode('utf-8')
        self.aes = AES.new(self.token, AES.MODE_CBC,b'0000000000000000')

    def encrypt(self,text):
        text = text.encode('utf-8')
        # 這里密鑰key 長度必須為16（AES-128）,
        # 24（AES-192）,或者32 （AES-256）Bytes 長度
        # 目前AES-128 足夠目前使用
        length = 16
        count = len(text)
        if count < length:
            add = (length - count)
            # \0 backspace
            # text = text + ('\0' * add)
            text = text + ('\0' * add).encode('utf-8')
        elif count > length:
            add = (length - (count % length))
            # text = text + ('\0' * add)
            text = text + ('\0' * add).encode('utf-8')
        self.ciphertext = self.aes.encrypt(text)
        # 因為AES加密時候得到的字符串不一定是ascii字符集的，輸出到終端或者保存時候可能存在問題
        # 所以這里統一把加密后的字符串轉化為16進制字符串
        return binascii.b2a_hex(self.ciphertext)



    def decrypt(self,str):
        plain_text = self.aes.decrypt(binascii.a2b_hex(str))
        # return plain_text.rstrip('\0')
        print(bytes.decode(plain_text).rstrip('\0'))
        return bytes.decode(plain_text).rstrip('\0')

        # # a = b'8fea87a50aa6203cfcfd508fa30f8fa0d8cd103e3a37ef057f7763eff7742b51'
        # # 用aes對象進行解密，將字節類型轉為str類型，錯誤編碼忽略不計
        # de = self.aes.decrypt(binascii.a2b_hex(str)), encoding='utf-8', errors="ignore")
        # # 獲取str從0開始到文本內容的字符串長度。
        # print(de)
        # return de

    def pad(text):
        while len(text) % 16 != 0:
            text += b' '
        return text
    #加密秘鑰需要長達16位字符，所以進行空格拼接
    def pad_key(key):
        while len(key) % 16 != 0:
            key += b' '
        return key
if __name__ == '__main__':
    conparse = conf_parse()
    conparse.confparse(vars)
    crypt=crypt_util()
    # print(crypt.encrypt("12345678"))
    crypt.decrypt('a56586aa860f83d6ba9a826b4c6df564')