java安全架构____AES加密原理

//使用安全数可以增加
SECURITY_STR 安全系数 
package demo.security;

import java.security.SecureRandom;

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

/**
 * @author God
 * AES加密解密工具类
 */
public class AESUtil {
	//加密模式
	public static final String ALGORITHM_AES="AES";
	//安全数 
	public static final String SECURITY_STR="zhangsan";
	
	/**
	 * 加密
	 * @param security_str
	 * @param clearText
	 * @return
	 */
	public static byte[] AESEncode(String security_str,String clearText){
		byte[] cipherBytes=null;
		try {
			// 1.构造密钥生成器，指
			KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM_AES);
			// 2.初始化秘钥生成器 加安全数
			keyGenerator.init(128, new SecureRandom(security_str.getBytes()));
			//获取安全秘钥
			SecretKey secretKey = keyGenerator.generateKey();
			///生成秘钥自己数组
			byte[] secretKeyBytes = secretKey.getEncoded();
			//根据字节数组生成AES秘钥
			SecretKeySpec secretKeySpec = new SecretKeySpec(secretKeyBytes, ALGORITHM_AES);
			// 根据AES生成密码器
			Cipher cipher = Cipher.getInstance(ALGORITHM_AES);
			//初始化密码器 加密模式,secretKeySpec
			cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
			//将明文进行自己数组加密处理
			cipherBytes=cipher.doFinal(clearText.getBytes());
		} catch (Exception e) {
			e.printStackTrace();
		}
		return cipherBytes;
	}
	
	/**
	 * 解密 安全数   加密的数组
	 * @return
	 */
	public static byte[] AESDecode(String security_str,byte [] cipherBytes){
		byte[] clearTextBytes=null;
		try {
			KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM_AES);
			keyGenerator.init(128, new SecureRandom(security_str.getBytes()));
			SecretKey secretKey = keyGenerator.generateKey();
			byte[] secretKeyBytes = secretKey.getEncoded();
			SecretKeySpec secretKeySpec = new SecretKeySpec(secretKeyBytes,ALGORITHM_AES);
			Cipher cipher = Cipher.getInstance(ALGORITHM_AES);// 创建密码器
			cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);// 初始化
			clearTextBytes = cipher.doFinal(cipherBytes);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return clearTextBytes;
	}
	
	/**
	 * 测试AES加密解密
	 * @param args
	 */
	public static void main(String[] args) {
		String clearText="老司机开车了";
		System.out.println("明文是_____:"+clearText);
		//加密
		System.out.println("机密后的密文是___________:"+AESEncode(SECURITY_STR, "老司机开车了"));
		
		byte[]bytes=AESDecode(SECURITY_STR, AESEncode(SECURITY_STR, "老司机开车了"));
		System.out.println("解析的明文是___:"+new String(bytes));
	}
}