Python和Java實現Aes相互加解密

前情

須要使用Python和Java實現同一個AES加解密算法，使Python版本加密的密文可以由Java代碼解密，反之亦然。

Python實現

Python爲3.6版本

# -*- coding: utf-8 -*-
import base64
from Crypto.Cipher import AES
from urllib import parse
 
AES_SECRET_KEY = 'lingyejunAesTest' #此處16|24|32個字符
IV = "1234567890123456"
 
# padding算法
BS = len(AES_SECRET_KEY)
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s: s[0:-ord(s[-1:])]
 
 
class AES_ENCRYPT(object):
    def __init__(self):
        self.key = AES_SECRET_KEY
        self.mode = AES.MODE_CBC
 
    #加密函數
    def encrypt(self, text):
        cryptor = AES.new(self.key.encode("utf8"), self.mode, IV.encode("utf8"))
        self.ciphertext = cryptor.encrypt(bytes(pad(text), encoding="utf8"))
        #AES加密時候獲得的字符串不必定是ascii字符集的，輸出到終端或者保存時候可能存在問題，使用base64編碼
        return base64.b64encode(self.ciphertext)
 
    #解密函數
    def decrypt(self, text):
        decode = base64.b64decode(text)
        cryptor = AES.new(self.key.encode("utf8"), self.mode, IV.encode("utf8"))
        plain_text = cryptor.decrypt(decode)
        return unpad(plain_text)
 
if __name__ == '__main__':
    aes_encrypt = AES_ENCRYPT()
    my_email = "lingyejun@python.aes"
    e = aes_encrypt.encrypt(my_email)
    d = aes_encrypt.decrypt(e)
    print(my_email)
    print(e)
    print(d)
複製代碼

Java實現

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
 
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
 
public class AesTest {
 
    /**
     * 加密用的Key 能夠用26個字母和數字組成
     * 此處使用AES-128-CBC加密模式，key須要爲16位。
     */
    private static String sKey = "lingyejunAesTest";
    private static String ivParameter = "1234567890123456";
 
    // 加密
    public static String encrypt(String sSrc) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，須要一個向量iv，可增長加密算法的強度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);//此處使用BASE64作轉碼。
    }
 
    // 解密
    public static String decrypt(String sSrc) {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }
 
    public static void main(String[] args) {
        String email = "lingyejun@java.aes";
        try {
            String sec = encrypt(email);
            System.out.println(sec);
            System.out.println(decrypt("CcOtM9WXv0N+Owh/xxedZJnuNUaTU7y3aUBESQLUvVM="));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
複製代碼

再將Java代碼加密出來的密鑰放到Python中進行解密

大功告成，實現了AES在Java和Python的互轉。