PBE

package com.zit;

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

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.SecretKeySpec;

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

public class PBETest {
	private static String src = "hello PBE";

	public static void main(String[] args) {
		jdkPBE();
	}

	public static void jdkPBE() {
		try {
			// 初始化鹽 鹽就是干擾的意思
			SecureRandom random = new SecureRandom();
			byte[] salt = random.generateSeed(8);// 指定爲8位的鹽 (鹽就是干擾碼，通過添加干擾碼增加安全)
			// 口令和密鑰
			String password = "lynu"; // 口令
			PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
			SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
			Key key = factory.generateSecret(pbeKeySpec); // 密鑰

			// 加密
			PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt, 100);// 參數規範，第一個參數是鹽，第二個是迭代次數（經過散列函數多次迭代）
			Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
			cipher.init(Cipher.ENCRYPT_MODE, key, pbeParameterSpec);
			byte[] result = cipher.doFinal(src.getBytes());
			System.out.println("jdk pbe加密： " + Base64.encodeBase64String(result));

			// 解密
			cipher.init(Cipher.DECRYPT_MODE, key, pbeParameterSpec);
			result = cipher.doFinal(result);
			System.out.println("jdk pbe解密：" + new String(result));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}