Java实现 Base64、MD5、MAC、HMAC加密(转)

package codec;

import java.security.MessageDigest;

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.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);

}
}

package codec;

import java.math.BigInteger;

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));
}
}

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