DESCoderUtil加密解密工具类

1、代码

package com.ra.util;

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


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.lang3.Validate;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
 
 
/**
 * DES安全编码组件
 * 
 * 
 * 支持 DES、DESede(TripleDES,就是3DES)、AES、Blowfish、RC2、RC4(ARCFOUR)
 * DES          		key size must be equal to 56
 * DESede(TripleDES) 	key size must be equal to 112 or 168
 * AES          		key size must be equal to 128, 192 or 256,but 192 and 256 bits may not be available
 * Blowfish     		key size must be multiple of 8, and can only range from 32 to 448 (inclusive)
 * RC2          		key size must be between 40 and 1024 bits
 * RC4(ARCFOUR) 		key size must be between 40 and 1024 bits
 * 具体内容 需要关注 JDK Document http://.../docs/technotes/guides/security/SunProviders.html
 * 
 * 
 * @author 
 * @version 1.0
 * @since 1.0
 */
public abstract class DESCoderUtil {
	/**
	 * ALGORITHM 算法 

	 * 可替换为以下任意一种算法，同时key值的size相应改变。
	 * 
	 * 
	 * DES          		key size must be equal to 56
	 * DESede(TripleDES) 	key size must be equal to 112 or 168
	 * AES          		key size must be equal to 128, 192 or 256,but 192 and 256 bits may not be available
	 * Blowfish     		key size must be multiple of 8, and can only range from 32 to 448 (inclusive)
	 * RC2          		key size must be between 40 and 1024 bits
	 * RC4(ARCFOUR) 		key size must be between 40 and 1024 bits
	 * 
	 * 
	 * 在Key toKey(byte[] key)方法中使用下述代码
	 * SecretKey secretKey = new SecretKeySpec(key, ALGORITHM); 替换
	 * 
	 * DESKeySpec dks = new DESKeySpec(key);
	 * SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
	 * SecretKey secretKey = keyFactory.generateSecret(dks);
	 * 
	 */
	public static final String ALGORITHM = "DES";
 
	private static SecureRandom random = new SecureRandom();
	
	/**
	 * BASE64解密
	 * 
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptBASE64(String key) throws Exception {
		return (new BASE64Decoder()).decodeBuffer(key);
	}
 
	/**
	 * BASE64加密
	 * 
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static String encryptBASE64(byte[] key) throws Exception {
		return (new BASE64Encoder()).encodeBuffer(key);
	}
	
	/**
	 * 生成随机的Byte[]作为salt
	 * @param numBytes
	 * @return
	 */
	public static byte[] generateSalt(int numBytes) {
		Validate.isTrue(numBytes > 0, "numBytes argument must be a positive integer (1 or larger)", numBytes);

		byte[] bytes = new byte[numBytes];
		random.nextBytes(bytes);
		return bytes;
	}
	
	/**
	 * 转换密钥

	 * 
	 * @param key
	 * @return
	 * @throws Exception
	 */
	private static Key toKey(byte[] key) throws Exception {
		DESKeySpec dks = new DESKeySpec(key);
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
		SecretKey secretKey = keyFactory.generateSecret(dks);
 
		// 当使用其他对称加密算法时，如AES、Blowfish等算法时，用下述代码替换上述三行代码
		// SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);
 
		return secretKey;
	}
 
	/**
	 * 解密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decrypt(byte[] data, String key) throws Exception {
		Key k = toKey(decryptBASE64(key));
 
		Cipher cipher = Cipher.getInstance(ALGORITHM);
		cipher.init(Cipher.DECRYPT_MODE, k);
 
		return cipher.doFinal(data);
	}
 
	/**
	 * 加密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encrypt(byte[] data, String key) throws Exception {
		Key k = toKey(decryptBASE64(key));
		Cipher cipher = Cipher.getInstance(ALGORITHM);
		cipher.init(Cipher.ENCRYPT_MODE, k);
 
		return cipher.doFinal(data);
	}
 
	/**
	 * 生成密钥
	 * 
	 * @return
	 * @throws Exception
	 */
	public static String initKey() throws Exception {
		return initKey(null);
	}
 
	/**
	 * 生成密钥
	 * 
	 * @param seed
	 * @return
	 * @throws Exception
	 */
	public static String initKey(String seed) throws Exception {
		SecureRandom secureRandom = null;
 
		if (seed != null) {
			secureRandom = new SecureRandom(decryptBASE64(seed));
		} else {
			secureRandom = new SecureRandom();
		}
 
		KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM);
		kg.init(secureRandom);
 
		SecretKey secretKey = kg.generateKey();
 
		return encryptBASE64(secretKey.getEncoded());
	}
}

2、测试

package com.ra.util;


import org.junit.Test;

public class DESCoderTest {

	/**
	 * 加密
	 * @throws Exception
	 */
	@Test
	public void test() throws Exception {
		byte[] generateSalt = DESCoderUtil.generateSalt(8);
		String salt = new String(generateSalt);
		System.out.println("盐：\t" + salt);
		
		String base64 = DESCoderUtil.encryptBASE64(salt.getBytes());
		System.out.println(base64);
		
		String inputStr = "DES";
		String key = DESCoderUtil.initKey(salt);
		System.err.println("原文:\t" + inputStr);
 
		System.err.println("密钥:\t" + key);
		byte[] inputData = inputStr.getBytes();
		
		inputData = DESCoderUtil.encrypt(inputData, key);
		System.out.println(inputData);
		System.err.println("加密后:\t" + DESCoderUtil.encryptBASE64(inputData));
 
		/*assertEquals(inputStr, outputStr);*/
	}

	/**
	 * 解密
	 * @throws Exception
	 */
	@Test
	public void test2() throws Exception {
		byte[] base64 = DESCoderUtil.decryptBASE64("W0JAMmZiNGI2OWQ=");
		System.out.println(new String(base64));
		
		String key = DESCoderUtil.initKey(new String(base64));
 
		System.err.println("密钥:\t" + key);
		
		String coder = "MXs1cE0CUHY=";//加密后代码
		
		byte[] bs = DESCoderUtil.decryptBASE64(coder);
		System.out.println(new String(bs));
		byte[] outputData = DESCoderUtil.decrypt(bs, key);
		String outputStr = new String(outputData);
 
		System.err.println("解密后:\t" + outputStr);
 
		/*assertEquals(inputStr, outputStr);*/
	}
}