DES加密

package com.zit;

import java.security.NoSuchAlgorithmException;

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

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

public class DesTest {
	private static String src = "hello DES";

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

	public static void jdkDES() {
		try {
			// 生成key
			KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
			keyGenerator.init(56);// 指定key長度,同是也是密鑰長度(56位)
			SecretKey secretKey = keyGenerator.generateKey();// 生成key的材料
			byte[] key = secretKey.getEncoded();// 生成key
			// key轉換成密鑰
			DESKeySpec desKeySpec = new DESKeySpec(key);
			SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
			SecretKey key2 = factory.generateSecret(desKeySpec);// 轉換後的密鑰

			// 加密
			Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");// 算法類型/工作方式/填充方式
			cipher.init(Cipher.ENCRYPT_MODE, key2);// 指定爲加密模式
			byte[] result = cipher.doFinal(src.getBytes());
			System.out.println("jdkDES加密: " + Hex.encodeHexString(result));// 轉換爲16進制

			// 解密
			cipher.init(Cipher.DECRYPT_MODE, key2);// 相同密鑰，指定爲解密模式
			result = cipher.doFinal(result);// 根據加密內容解密
			System.out.println("jdkDES解密： " + new String(result));// 轉換字符串
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}