Java中使用AES加解密

对称算法及AES算法简介：https://blog.csdn.net/ws_kfxd/article/details/105818257

package test;

import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class AES {
     
	public static void main(String[] args) {
     
		String key = "1234567890123456";//定义密钥
		String context = "这是要加密的明文!!!123456***";
		//处理密钥（不一定用这种方法）
		byte[] finKey = dealKey(key);
		//加密
		String ciphertext = encrypt(context,finKey);
		//解密
		String plaintext = decrypt(ciphertext,finKey);
		
		//输出数据
		System.out.print("处理后的密钥：");
		for (int i = 0; i < finKey.length; i++) {
     
			System.out.print(finKey[i]);
		}
		System.out.println();
		System.out.println("加密后："+ciphertext);
		System.out.println("解密后："+plaintext);
	}
	
	/**
	 * 处理密钥
	 * @param key初始密钥
	 * @return
	 */
	public static byte[] dealKey(String key)  {
     
		//生成安全随机数
		SecureRandom secureRandom = null;
		byte[] enCodeFormat = null;
		try {
     
			secureRandom = SecureRandom.getInstance("SHA1PRNG");//指定算法，目前只支持SHA1PRNG
			secureRandom.setSeed(key.getBytes());//设置种子，替代系统默认随机源
			KeyGenerator kgen = KeyGenerator.getInstance("AES");//构造密钥生成器，指定为AES算法，不区分大小写
			kgen.init(128, secureRandom);//通过指定大小和随机源的方式产生
			SecretKey secretKey = kgen.generateKey();//生成秘钥，返回SecertKey对象
			enCodeFormat = secretKey.getEncoded();
		} catch (Exception e) {
     
			e.printStackTrace();
		}
		return enCodeFormat;
	}
	
	/**
	 * AES加密并使用base64编码
	 * @param context明文
	 * @param finKey密钥
	 * @return
	 */
	public static String encrypt(String context,byte[] key) {
     
		SecretKeySpec skeySpec = null;
		Cipher cipher = null;
		byte[] encrypted = null;
		try {
     
			skeySpec = new SecretKeySpec(key, "AES");
			cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
			cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
			encrypted = cipher.doFinal(context.getBytes("utf-8"));
		} catch (Exception e) {
     
			e.printStackTrace();
		}
		return new Base64().encodeToString(encrypted);//使用base64编码
	}
	
	/**
	 * AES解密
	 * @param context base64编码后的密文
	 * @param finKey密钥
	 * @return
	 */
	public static String decrypt(String context,byte[] key) {
     
		SecretKeySpec skeySpec = null;
		Cipher cipher = null;
		byte[] encrypted = new Base64().decode(context);//base64解码
		byte[] encryptedRet = null;
		String ret = null;
		try {
     
			skeySpec = new SecretKeySpec(key, "AES");
			cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
			cipher.init(Cipher.DECRYPT_MODE, skeySpec);
			encryptedRet = cipher.doFinal(encrypted);
			ret = new String(encryptedRet,"utf-8");
		} catch (Exception e) {
     
			e.printStackTrace();
		}
		return ret;
	}
}

运行结果：