单向加密——JAVA消息摘要算法使用

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在Java中使用MD、SHA、MAC三种消息摘要算法实现加解密。

1.MD

package com.imooc.security;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.Security;import org.apache.commons.codec.binary.Hex;import org.apache.commons.codec.digest.DigestUtils;import org.bouncycastle.crypto.Digest;import org.bouncycastle.crypto.digests.MD4Digest;import org.bouncycastle.crypto.digests.MD5Digest;import org.bouncycastle.jce.provider.BouncyCastleProvider;import org.junit.Test;public class ImoocMd {    private String srcStr = "imooc security md";    /**     * JDK实现MD5     */    @Test    public void jdkMd5(){        try {            MessageDigest md = MessageDigest.getInstance("MD5");            byte[] md5Bytes = md.digest(srcStr.getBytes());            //将byte数组转成16进制；            String md5Str = Hex.encodeHexString(md5Bytes);            System.out.println("JDK MD5:"+md5Str);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }    }    /**     * JDK实现MD2     */    @Test    public void jdkMd2(){        try {            MessageDigest md = MessageDigest.getInstance("MD2");            byte[] md2Bytes = md.digest(srcStr.getBytes());            //将byte数组转成16进制；            String md2Str = Hex.encodeHexString(md2Bytes);            System.out.println("JDK MD2:"+md2Str);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }    }    /**     * bc,md5     */    @Test    public void bcMd5(){        Digest digest = new MD5Digest();        digest.update(srcStr.getBytes(), 0, srcStr.length());        byte[] md5Bytes = new byte[digest.getDigestSize()];        digest.doFinal(md5Bytes, 0);        String md5Str = org.bouncycastle.util.encoders.Hex.toHexString(md5Bytes);        System.out.println(" BC MD5:"+md5Str);    }    /**     * bc,md4     */    @Test    public void bcMd4(){        Digest digest = new MD4Digest();        digest.update(srcStr.getBytes(), 0, srcStr.length());        byte[] md4Bytes = new byte[digest.getDigestSize()];        digest.doFinal(md4Bytes, 0);        String md4Str = org.bouncycastle.util.encoders.Hex.toHexString(md4Bytes);        System.out.println(" BC MD4:"+md4Str);    }    /**     * bc,md4:方法2     */    @Test    public void bcMd42(){        try {            Security.addProvider(new BouncyCastleProvider());            MessageDigest md = MessageDigest.getInstance("MD4");            byte[] md4Bytes = md.digest(srcStr.getBytes());            //将byte数组转成16进制；            String md4Str = Hex.encodeHexString(md4Bytes);            System.out.println("BC的MD4方法2:\n BC MD4:"+md4Str);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }    }    /**     * cc,md5     */    @Test    public void ccMd5(){        String md5Str = DigestUtils.md5Hex(srcStr.getBytes());        System.out.println("CC MD5:"+md5Str);    }    /**     * cc,md2     */    @Test    public void ccMd2(){        String md2Str = DigestUtils.md2Hex(srcStr.getBytes());        System.out.println("CC MD2:"+md2Str);    }}

结果：
BC的MD4方法2:
BC MD4:d4878ee1ed8379537813b3888320ad04
JDK MD2:54ade03d9765c9f0290189a2ae704ee7
JDK MD5:89048f19b72e7367b7faacfe659a8de0
BC MD4:d4878ee1ed8379537813b3888320ad04
BC MD5:89048f19b72e7367b7faacfe659a8de0
CC MD2:54ade03d9765c9f0290189a2ae704ee7
CC MD5:89048f19b72e7367b7faacfe659a8de0

2.SHA

package com.imooc.security;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.Security;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 org.junit.Test;public class ImoocSha {    private String srcStr = "imooc security sha";    /**     * 自带,SHA1     */    @Test    public void jdkSha1(){        try {            MessageDigest md = MessageDigest.getInstance("SHA");            md.update(srcStr.getBytes());            //将byte数组转成16进制；            String sha1Str = Hex.encodeHexString(md.digest());            System.out.println("JDK SHA1:"+sha1Str);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }    }    /**     * BC SHA1的方法     */    @Test    public void bcSha1(){        Digest digest = new SHA1Digest();        digest.update(srcStr.getBytes(), 0, srcStr.getBytes().length);        byte[] sha1Bytes = new byte[digest.getDigestSize()];        digest.doFinal(sha1Bytes, 0);        //将byte数组转成16进制；        String sha1Str = org.bouncycastle.util.encoders.Hex.toHexString(sha1Bytes);        System.out.println(" BC SHA1:"+sha1Str);    }    /**     * BC SHA2：SHA224的方法     */    @Test    public void bcSha224(){        Digest digest = new SHA224Digest();        digest.update(srcStr.getBytes(), 0, srcStr.getBytes().length);        byte[] sha224Bytes = new byte[digest.getDigestSize()];        digest.doFinal(sha224Bytes, 0);        //将byte数组转成16进制；        String sha224Str = org.bouncycastle.util.encoders.Hex.toHexString(sha224Bytes);        System.out.println(" BC SHA224:"+sha224Str);    }    /**     * BC SHA2：SHA224的方法     */    @Test    public void bcSha224_2(){        try {            Security.addProvider(new BouncyCastleProvider());            MessageDigest md = MessageDigest.getInstance("SHA224");            md.update(srcStr.getBytes());            //将byte数组转成16进制；            String sha224Str = Hex.encodeHexString(md.digest());            System.out.println("方法二： BC SHA224:"+sha224Str);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }    }    /**     * CC SHA1:     */    @Test    public void ccSha1(){        String sha1 = DigestUtils.sha1Hex(srcStr.getBytes());        System.out.println("方法一： CC SHA1:"+sha1);        sha1 = DigestUtils.sha1Hex(srcStr);        System.out.println("方法二： CC SHA1:"+sha1);    }}

结果：
JDK SHA1:8bb95fe138f7e9d993dd90bae339a45e56b72eb7
BC SHA1:8bb95fe138f7e9d993dd90bae339a45e56b72eb7
方法二： BC SHA224:0b71cc6f590e1d026c922a99081a14e2c58818f4047dae6db3cf3d67
方法一： CC SHA1:8bb95fe138f7e9d993dd90bae339a45e56b72eb7
方法二： CC SHA1:8bb95fe138f7e9d993dd90bae339a45e56b72eb7
BC SHA224:0b71cc6f590e1d026c922a99081a14e2c58818f4047dae6db3cf3d67

3.MAC

package com.imooc.security;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import javax.crypto.KeyGenerator;import javax.crypto.Mac;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import org.apache.commons.codec.DecoderException;import org.apache.commons.codec.binary.Hex;import org.bouncycastle.crypto.Digest;import org.bouncycastle.crypto.digests.MD5Digest;import org.bouncycastle.crypto.macs.HMac;import org.bouncycastle.crypto.params.KeyParameter;import org.junit.Test;public class ImoocHmac {    private String srcStr = "imooc security hmac";    /**     * JDK hmac消息摘要算法；     */    @Test    public void jdkHmacMD5(){        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();            //设置密钥；            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(srcStr.getBytes());            //转成16进制字符串            String hmacStr = Hex.encodeHexString(hmacMD5Bytes);            System.out.println("JDK hmacMD5:"+hmacStr);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (DecoderException e) {            e.printStackTrace();        }     }    /**     * bc的hmac算法应用     */    @Test    public void bcHmacMD5(){        Digest digest = new MD5Digest();        HMac hmac = new HMac(digest);        byte[] initHexStr = org.bouncycastle.util.encoders.Hex.decode("aaaaaaaaaa");        //初始化Mac；        hmac.init(new KeyParameter(initHexStr));        //更新Mac；        hmac.update(srcStr.getBytes(), 0, srcStr.getBytes().length);        //预设置摘要结果；        byte[] hmacMD5Bytes = new byte[hmac.getMacSize()];        hmac.doFinal(hmacMD5Bytes, 0);        //将byte数组转成16进制；        String hmacStr = org.bouncycastle.util.encoders.Hex.toHexString(hmacMD5Bytes);        System.out.println(" BC hmacMD5:"+hmacStr);    }}

结果：
BC hmacMD5:522b5217700cdcedd73f19bd67bad599
JDK hmacMD5:522b5217700cdcedd73f19bd67bad599

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