DESTest.java

package com.timliu.security.symmetric_encryption;

import java.security.Key;
import java.security.Security;

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;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class DESTest 
{
	public static final String src = "des test";
	public static void main(String[] args) 
	{
		jdkDES();
		bcDES();

	}
	
	// 用jdk实现:
	public static void jdkDES()
	{
		try 
		{
			// 生成KEY
			KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");			
			keyGenerator.init(56);
			// 产生密钥
			SecretKey secretKey = keyGenerator.generateKey();
			// 获取密钥
			byte[] bytesKey = secretKey.getEncoded();
			
			
			// KEY转换
			DESKeySpec desKeySpec = new DESKeySpec(bytesKey);
			SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
			Key convertSecretKey = factory.generateSecret(desKeySpec);
			
			
			// 加密
			Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
			byte[] result = cipher.doFinal(src.getBytes());
			System.out.println("jdk des encrypt:" + Hex.encodeHexString(result));
			
			// 解密
			cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
			result = cipher.doFinal(result);
			System.out.println("jdk des decrypt:" + new String(result));
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	// 用bouncy castle实现:
	public static void bcDES()
	{
		try 
		{
			Security.addProvider(new BouncyCastleProvider());
			
			// 生成KEY
			KeyGenerator keyGenerator = KeyGenerator.getInstance("DES", "BC");
			keyGenerator.getProvider();
			keyGenerator.init(56);
			// 产生密钥
			SecretKey secretKey = keyGenerator.generateKey();
			// 获取密钥
			byte[] bytesKey = secretKey.getEncoded();
			
			
			// KEY转换
			DESKeySpec desKeySpec = new DESKeySpec(bytesKey);
			SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
			Key convertSecretKey = factory.generateSecret(desKeySpec);
			
			
			// 加密
			Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
			byte[] result = cipher.doFinal(src.getBytes());
			System.out.println("bc des encrypt:" + Hex.encodeHexString(result));
			
			// 解密
			cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
			result = cipher.doFinal(result);
			System.out.println("bc des decrypt:" + new String(result));
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}