Java实现 Base64、MD5、MAC、HMAC加密(转)

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 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));
    }
}

Output:

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