java实现对称加密(3DES)_java使用3des根据用户id生成随机对称密钥-优快云博客

本文链接：https://blog.youkuaiyun.com/ITqingliang/article/details/60777203

本文提供了一个使用 Java 实现 3DES (Triple DES) 加密和解密的具体示例。通过 KeyGenerator 和 SecretKeyFactory 创建密钥，并利用 Cipher 类完成对字符串的加密及解密操作。该示例展示了如何处理加密过程中的各种异常。

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package cn.huse.des;

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.DESedeKeySpec;

public class DESDemo02 {

	private static String src = "How old are you";
	public static void main(String[] args) {
		jdk3DES();
	}
	private static void jdk3DES(){
		
		try {
			//生成KEY
			KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
			keyGenerator.init(168);
			SecretKey secretKey = keyGenerator.generateKey();
			byte[] encoded = secretKey.getEncoded();
			
			//KEY转换
			DESedeKeySpec deSedeKeySpec = new DESedeKeySpec(encoded);
			SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
			Key key = factory.generateSecret(deSedeKeySpec);
			
			//加密
			Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, key);
			byte[] result = cipher.doFinal(src.getBytes());
		//	System.out.println(new String(result));
			
			//解密
			cipher.init(Cipher.DECRYPT_MODE, key);
			result = cipher.doFinal(result);
			System.out.println(new String(result));
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
}