DES对称加密算法Java实现

DES对称加密算法Java实现

源代码AESUtils.java

//package me.muphy.util;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;

public class AESUtils {
    private static final String AES = "AES";
    private static SecretKey secretKey = null;

    public static SecretKey getSecretKey() throws NoSuchAlgorithmException {
        if (secretKey != null) {
            return secretKey;
        }
        KeyGenerator keyGenerator = KeyGenerator.getInstance(AES);
        keyGenerator.init(new SecureRandom());//不使用种子,每次生成的都不同，可以不要
        secretKey = keyGenerator.generateKey();
        return secretKey;
    }

    public static String encrypt(String data) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
        SecretKey secretKey = getSecretKey();
        return encrypt(data, secretKey);
    }

    public static String encrypt(String data, String secret) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
        SecretKey secretKey = toSecretKey(secret);
        return encrypt(data, secretKey);
    }

    public static String encrypt(String data, SecretKey secretKey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
        Cipher cipher = Cipher.getInstance(AES);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] bytes = data.getBytes(StandardCharsets.UTF_8);
        byte[] encryptedData = cipher.doFinal(bytes);
        return base64Encrypt(encryptedData);
    }

    public static String decrypt(String data) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        SecretKey secretKey = getSecretKey();
        return decrypt(data, secretKey);
    }

    public static String decrypt(String data, String secret) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        SecretKey secretKey = toSecretKey(secret);
        return decrypt(data, secretKey);
    }

    public static String decrypt(String data, SecretKey secretKey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher cipher = Cipher.getInstance(AES);
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] base64Decrypt = base64Decrypt(data);
        byte[] decryptedData = cipher.doFinal(base64Decrypt);
        return new String(decryptedData, StandardCharsets.UTF_8);
    }

    private static String base64Encrypt(byte[] bytes) {
        byte[] encode = Base64.getEncoder().encode(bytes);
        return new String(encode, StandardCharsets.UTF_8);
//        return  new BASE64Encoder().encode(bytes);
    }

    private static byte[] base64Decrypt(String data) {
        byte[] bytes = data.getBytes(StandardCharsets.UTF_8);
        return Base64.getDecoder().decode(bytes);
//        return  new BASE64Decoder().decodeBuffer(data);
    }

    private static SecretKey toSecretKey(String secret) {
        byte[] decodedKey = Base64.getDecoder().decode(secret);
        return new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
    }

    private static String toSecretString(SecretKey secretKey) {
        byte[] encoded = secretKey.getEncoded();
        return Base64.getEncoder().encodeToString(encoded);
    }

    public static void main(String[] args) {
        try {
            String s1 = "hello zian 1";
            String es1 = encrypt(s1);
            String ds1 = decrypt(es1);
            System.out.println(s1 + " = 加密：" + es1 + "，解密：" + ds1);

            String s2 = "hello zian 2";
            String secret = "yKCzTJcIfnrHVNLR5Xo6zw==";
            String es2 = encrypt(s2, secret);
            String ds2 = decrypt(es2, secret);
            System.out.println(s2 + " = 加密：" + es2 + "，解密：" + ds2);
        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
            e.printStackTrace();
        }
    }
}

测试结果