时间：2017年4月10日星期一
说明：本文部分内容均来自慕课网。@慕课网：教学示例源码：个人学习源码：第一章：概述
1-1 Java实现消息摘要算法加密
消息摘要算法
MD（Message Digest）SHA（Secure Hash Algorithm）MAC（Message Authentication Code）验证数据完整性数字签名核心算法
第二章：消息摘要算法MD
2-1 MD算法概述
消息摘要算法：MD
MD5MD家族（128位摘要信息）--MD2、MD4特点
算法实现：
2-2 MD算法实现
代码演示：
package com.myimooc.security.md;import org.apache.commons.codec.binary.Hex;import org.apache.commons.codec.digest.DigestUtils;import org.bouncycastle.crypto.Digest;import org.bouncycastle.crypto.digests.MD5Digest;import org.bouncycastle.jce.provider.BouncyCastleProvider;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.Security;/** * MD消息摘要加密演示 * Created by ZC on 2017/4/10. */public class DemoMD { /** 待加密字符串 */ private static String src="imooc security md"; public static void main(String[] args){ jdkMD5(); jdkMD2(); bcMD4(); bcMD5(); ccMD5(); ccMD2(); } /** * 通过 jdk 实现MD5加密 */ public static void jdkMD5(){ try { MessageDigest md = MessageDigest.getInstance("MD5"); byte[] md5Bytes = md.digest(src.getBytes()); System.out.println("JDK MD5:"+Hex.encodeHexString(md5Bytes)); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } /** * 通过 jdk 实现MD2加密 */ public static void jdkMD2(){ try { MessageDigest md = MessageDigest.getInstance("MD2"); byte[] md2Bytes = md.digest(src.getBytes()); System.out.println("JDK MD2:"+Hex.encodeHexString(md2Bytes)); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } /** * 通过 bouncy castle 实现MD5加密 */ public static void bcMD5(){ Digest digest = new MD5Digest(); digest.update(src.getBytes(),0,src.getBytes().length); byte[] md5Bytes = new byte[digest.getDigestSize()]; digest.doFinal(md5Bytes,0); System.out.println("BC MD5:"+org.bouncycastle.util.encoders.Hex.toHexString(md5Bytes)); } /** * 通过 bouncy castle 实现MD4加密 */ public static void bcMD4(){ try { Security.addProvider(new BouncyCastleProvider()); MessageDigest md = MessageDigest.getInstance("MD4"); byte[] md5Bytes = md.digest(src.getBytes()); System.out.println("BC MD4:"+org.bouncycastle.util.encoders.Hex.toHexString(md5Bytes)); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } /** * 通过 commons codec 实现MD5加密 */ public static void ccMD5(){ System.out.println("CC MD5:"+DigestUtils.md5Hex(src.getBytes())); } /** * 通过 commons codec 实现MD5加密 */ public static void ccMD2(){ System.out.println("CC MD2:"+DigestUtils.md2Hex(src.getBytes())); }} 2-3 MD算法应用
流程演示：
第三章：消息摘要算法SHA
3-1 SHA算法概述
消息摘要算法：SHA
安全散列算法固定长度摘要信息SHA-1、SHA-2（SHA-224、SHA-256、SHA-384、SHA-512）
算法实现：
3-2 SHA算法实现
代码演示：
package com.myimooc.security.sha;import org.apache.commons.codec.binary.Hex;import org.apache.commons.codec.digest.DigestUtils;import org.bouncycastle.crypto.Digest;import org.bouncycastle.crypto.digests.SHA1Digest;import org.bouncycastle.crypto.digests.SHA224Digest;import org.bouncycastle.jce.provider.BouncyCastleProvider;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.Security;/** * SHA消息摘要加密演示 * Created by ZC on 2017/4/10. */public class DemoSHA { /** 待加密字符串 */ private static String src="imooc security sha"; public static void main(String[] args){ jdkSHA1(); bcSHA1(); bcSHA224(); bcSHA224_2(); ccSHA1(); } /** * 通过 JDK 实现SHA-1 加密 */ public static void jdkSHA1(){ try { MessageDigest md = MessageDigest.getInstance("SHA"); md.update(src.getBytes()); System.out.println("jdk sha-1:"+ Hex.encodeHexString(md.digest())); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } /** * 通过 bouncy castle 实现SHA-1 加密 */ public static void bcSHA1(){ Digest digest = new SHA1Digest(); digest.update(src.getBytes(),0,src.getBytes().length); byte[] sha1Bytes = new byte[digest.getDigestSize()]; digest.doFinal(sha1Bytes,0); System.out.println("bc sha-1:"+ org.bouncycastle.util.encoders.Hex.toHexString(sha1Bytes)); } /** * 通过 bouncy castle 实现SHA-224 加密 */ public static void bcSHA224(){ Digest digest = new SHA224Digest(); digest.update(src.getBytes(),0,src.getBytes().length); byte[] sha224Bytes = new byte[digest.getDigestSize()]; digest.doFinal(sha224Bytes,0); System.out.println("bc sha-224:"+ org.bouncycastle.util.encoders.Hex.toHexString(sha224Bytes)); } /** 通过 provider 实现SHA224加密 */ public static void bcSHA224_2(){ Security.addProvider(new BouncyCastleProvider()); try { MessageDigest md = MessageDigest.getInstance("SHA224"); byte[] sha224Bytes = md.digest(src.getBytes()); System.out.println("sha-224:"+ org.bouncycastle.util.encoders.Hex.toHexString(sha224Bytes)); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } /** 通过 commons.codec 实现SHA-1加密 */ public static void ccSHA1(){ System.out.println("cc sha1-1:"+DigestUtils.sha1Hex(src.getBytes())); System.out.println("cc sha1-2:"+DigestUtils.sha1Hex(src)); }} 3-3 SHA算法应用
流程演示：
应用例子：
第四章：消息摘要算法MAC
4-1 消息摘要算法MAC实现与应用
MAC（Message Authentication Code）
HMAC（keyed-Hash Message Authentication Code）--含有密钥的散列函数算法融合MD、SHA --MD系列：HmacMD2、HmacMD4、HmacMD5应用如SecureCRT
算法实现：
代码演示：
package com.myimooc.security.mac;import org.apache.commons.codec.binary.Hex;import org.bouncycastle.crypto.digests.MD5Digest;import org.bouncycastle.crypto.macs.HMac;import org.bouncycastle.crypto.params.KeyParameter;import javax.crypto.KeyGenerator;import javax.crypto.Mac;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import java.security.NoSuchAlgorithmException;/** * MAC消息摘要加密演示 * Created by ZC on 2017/4/11. */public class DemoMac { /** 待加密字符串 */ private static String src="imooc security mac"; public static void main(String[] args){ jdkHmacDM5(); bcHmacMD5(); } /** jdk实现hmac MD5摘要算法 */ public static void jdkHmacDM5(){ try { // 初始化 KeyGenerator KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5"); // 产生密钥 SecretKey secretKey = keyGenerator.generateKey(); // 获得密钥 //byte[] key = secretKey.getEncoded(); // 自定义密钥 byte[] key = Hex.decodeHex(new char[]{'a','a','a','a','a','a','a','a','a','a'}); // 还原密钥 SecretKey restoreSecretKey = new SecretKeySpec(key,"HmacMD5"); // 实例化 MAC Mac mac = Mac.getInstance(restoreSecretKey.getAlgorithm()); // 初始化 MAC mac.init(restoreSecretKey); // 执行摘要 byte[] hmacMD5Bytes = mac.doFinal(src.getBytes()); System.out.println("jdk hmacMD5:"+ Hex.encodeHexString(hmacMD5Bytes)); } catch (Exception e) { e.printStackTrace(); } } /** bouncycastle.crypto实现hmacMD5加密 */ public static void bcHmacMD5(){ HMac hmac = new HMac(new MD5Digest()); hmac.init(new KeyParameter(org.bouncycastle.util.encoders.Hex.decode("aaaaaaaaaa"))); hmac.update(src.getBytes(),0,src.getBytes().length); // 执行摘要 byte[] hmacMD5Bytes = new byte[hmac.getMacSize()]; hmac.doFinal(hmacMD5Bytes,0); System.out.println("bc hmacMD5:"+ org.bouncycastle.util.encoders.Hex.toHexString(hmacMD5Bytes)); }} 流程演示：
消息摘要算法：其它
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