Java实现 Base64、MD5、MAC、HMAC加密

开始对那些基本的加密还不怎么熟练，然后总结了些，写了一个测试：支持 Base64、MD5、MAC、HMAC加密，长话短说，我们都比较喜欢自己理解，看代码吧！

采用的输UTF-8的格式...

 package visec;
 import java.security.MessageDigest;
 import javax.crypto.KeyGenerator;
 import javax.crypto.Mac;
 import javax.crypto.SecretKey;
 import javax.crypto.spec.SecretKeySpec;

 import Decoder.BASE64Decoder;
 import Decoder.BASE64Encoder;
 /**
  * 基础加密组件
  * @author Visec·Dana
  * @version 1.0
  * @since 1.0
  */
 public abstract class Coder {
     public static final String KEY_SHA = "SHA";
     public static final String KEY_MD5 = "MD5";

     /**
      * MAC算法可选以下多种算法
      * <pre>
      * HmacMD5
      * HmacSHA1
      * HmacSHA256
      * HmacSHA384
      * HmacSHA512
      * </pre>
      */
     public static final String KEY_MAC = "HmacMD5";

     /**
      * 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);
     }
     /**
      * MD5加密
      * @param data
      * @return
      * @throws Exception
      */
     public static byte[] encryptMD5(byte[] data) throws Exception {

         MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);
         md5.update(data);
         return md5.digest();

     }
     /**
      * SHA加密
      * @param data
      * @return
      * @throws Exception
      */
     public static byte[] encryptSHA(byte[] data) throws Exception {
         MessageDigest sha = MessageDigest.getInstance(KEY_SHA);
         sha.update(data);
         return sha.digest();

     }
     /**
      * 初始化HMAC密钥
      * @return
      * @throws Exception
      */
     public static String initMacKey() throws Exception {
         KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);
         SecretKey secretKey = keyGenerator.generateKey();
         return encryptBASE64(secretKey.getEncoded());
     }
     /**
      * MAC加密
      * @param data
      * @param key
      * @return
      * @throws Exception
      */
     public static byte[] encryptHMAC(byte[] data, String key) throws Exception {
         SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);
         Mac mac = Mac.getInstance(secretKey.getAlgorithm());
         mac.init(secretKey);
         return mac.doFinal(data);

     }
 }

下面是一个测试类，及输入命令

 package visec;

 import java.math.BigInteger;

 /**
  * 加密测试
  * @author Visec·Dana
  * @version 1.0
  * @since 1.0
  */
 public class CoderTest {
     public static void main(String[] args) throws Exception {
         CoderTest.test();
     }

     public static void test() throws Exception {
         String inputStr = "这是一些简单的加密测试";
         System.err.println("原文:" + inputStr);

         byte[] inputData = inputStr.getBytes();
         String code = Coder.encryptBASE64(inputData);

         System.err.println("BASE64加密后:" + code);

         byte[] output = Coder.decryptBASE64(code);

         String outputStr = new String(output);

         System.err.println("BASE64解密后:" + outputStr);

         //单元测试 Junit4[暂时不用...]
         /*// 验证BASE64加密解密一致性
         assertEquals(inputStr, outputStr);

         // 验证MD5对于同一内容加密是否一致
         assertArrayEquals(Coder.encryptMD5(inputData), Coder
                 .encryptMD5(inputData));

         // 验证SHA对于同一内容加密是否一致
         assertArrayEquals(Coder.encryptSHA(inputData), Coder
                 .encryptSHA(inputData));

         String key = Coder.initMacKey();
         System.err.println("Mac密钥:/n" + key);

         // 验证HMAC对于同一内容，同一密钥加密是否一致
         assertArrayEquals(Coder.encryptHMAC(inputData, key), Coder.encryptHMAC(
                 inputData, key));
         */
         BigInteger md5 = new BigInteger(Coder.encryptMD5(inputData));
         System.err.println("MD5:" + md5.toString(16));

         BigInteger sha = new BigInteger(Coder.encryptSHA(inputData));
         System.err.println("SHA:" + sha.toString(32));

         BigInteger mac = new BigInteger(Coder.encryptHMAC(inputData, inputStr));
         System.err.println("HMAC:" + mac.toString(16));
     }
 }

下面呢是控制台输出：

原文:这是一些简单的加密测试
BASE64加密后:6L+Z5piv5LiA5Lqb566A5Y2V55qE5Yqg5a+G5rWL6K+V

BASE64解密后:这是一些简单的加密测试
MD5:76757e30d128e82b14488b115794d959
SHA:6f7afslor1oev1k7k40um57cscuqkjtn
HMAC:782313e944a28a55fc20507e50a9d470