Java安全架构____KeyGenerator(对称)秘钥生成工具详解

package com.ryx.frame.security.aes;

import java.security.SecureRandom;
import java.util.Date;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

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

public class KeyGeneral{
	/**
	 * AES 128,256
	 * DEA 56
	 */
//===========================加密方式======================\\
	private static final String ALGORITHM_HMACMD5="HmacMD5";
	private static final String ALGORITHM_AES="AES";
	private static final String ALGORITHM_DES="DES";
//===========================加密类型于算法无关======================\\
	//默认
	public static String initDefault() {
		String key = "";
		try {
			KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM_HMACMD5);
			SecretKey secretKey=generator.generateKey();
			byte[]bytes=encode(secretKey.getEncoded());
			key=new String(bytes);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return key;
	}
	//安全随机种子
	public static String initAESKey(int keysize,long seed) {
		String key = "";
		try {
			KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM_AES);
		    SecureRandom random=new  SecureRandom();
		    random.setSeed(seed);
			generator.init(keysize, random);
			SecretKey secretKey=generator.generateKey();
			byte[]bytes=encode(secretKey.getEncoded());
			key=new String(bytes);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return key;
	}
	//安全随机种子
	public static String initDESKey(int keysize,long seed) {
		String key = "";
		try {
			KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM_DES);
			SecureRandom random=new  SecureRandom();
			random.setSeed(seed);
			generator.init(keysize, random);
			SecretKey secretKey=generator.generateKey();
			byte[]bytes=encode(secretKey.getEncoded());
			key=new String(bytes);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return key;
	}
//===========================base64======================\\
	public static byte[] encode(byte[]plainBytes){
		Base64 base64=new Base64();
		return base64.encode(plainBytes);
	}
	public static byte[] decode(byte[]cipherText){
		Base64 base64=new Base64();
		return base64.decode(cipherText);
	}     
//============================test========================\\
	public static void main(String[] args) {
		System.out.println("加载默认配置算法为HmacMD5__:"+initDefault());
		
		System.out.println("加载默认配置算法为AES__:"+initAESKey(256,new Date().getTime()));

		System.out.println("加载默认配置算法为DES__:"+initDESKey(56,new Date().getTime()));
	}
	
		
}

//=====================运行结果

加载默认配置算法为HmacMD5__:1MeVXQZkMWHPy0VLgpwrO44AIfFq2Y+D6gDqPz7BSLQ3iaZOR18DBI5yaSYtCTEXRQYQpwYV5d1UWVefd6v58A==
加载默认配置算法为AES__:5pUQCt/CLNK44vL+Nm7mgC7IcX1QfGnVc5BwqOrvk7M=
加载默认配置算法为DES__:FnldAm04/dY=