BASE64、MD、SHA都常用3种算法
1、jdk（不推荐）
2、commonsCodec (其实就是用JDK，但简化了操作)【推荐】
3、Bouncy Castle (对JDK的补充，丰富了一些功能)
Base64的3种算法
import java.io.IOException;
import org.apache.tomcat.util.codec.binary.Base64;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import org.junit.jupiter.api.Test;
public class optest {
private static String src = "ruhuashop.com";
@Test
public void index() {
System.out.println("开始");
jdkBase64();
System.out.println("-------------------------------");
commonsCodesBase64();
System.out.println("-------------------------------");
bouncyCastleBase64();
}
public void jdkBase64() {
try {
BASE64Encoder encoder = new BASE64Encoder();
String encode = encoder.encode(src.getBytes());
System.out.println("encode : " + encode);
BASE64Decoder decoder = new BASE64Decoder();
System.out.println("decode : " + new String(decoder.decodeBuffer(encode)));
} catch (IOException e) {
e.printStackTrace();
}
}
public void commonsCodesBase64() {
byte[] encodeBytes = Base64.encodeBase64(src.getBytes());
System.out.println("encode : " + new String(encodeBytes));
byte[] decodeBytes = Base64.decodeBase64(encodeBytes);
System.out.println("decode : " + new String(decodeBytes));
}
public void bouncyCastleBase64() {
byte[] encodeBytes = org.bouncycastle.util.encoders.Base64.encode(src.getBytes());
System.out.println("encode : " + new String(encodeBytes));
byte[] decodeBytes = org.bouncycastle.util.encoders.Base64.decode(encodeBytes);
System.out.println("decode : " + new String(decodeBytes));
}
}
bouncyCastle需maven引入：
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.49</version>
</dependency>
MD算法; MD2、MD4、MD5
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.jupiter.api.Test;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import org.apache.commons.codec.binary.Hex;
public class optest2 {
private static String src = "ruhuashop.com";
@Test
public void index() {
System.out.println("开始");
jdkMD5();
System.out.println("-------------------------------");
jdkMD2();
System.out.println("-------------------------------");
bcMD5();
System.out.println("-------------------------------");
bcMD4();
System.out.println("-------------------------------");
ccMD5();
System.out.println("-------------------------------");
ccMD2();
}
public 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();
}
}
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();
}
}
public 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));
}
// 复制上面的bc md5方法改为md4也是可以运行的；另一种bc md4方法
public void bcMD4() {
try {
Security.addProvider(new BouncyCastleProvider());
MessageDigest md = MessageDigest.getInstance("MD4");
byte[] md5Bytes = md.digest(src.getBytes());
System.out.println("BC MD4 : " + Hex.encodeHexString(md5Bytes));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
//import org.apache.commons.codec.digest.DigestUtils;
public void ccMD5() {
System.out.println("CC MD5 : " + DigestUtils.md5Hex(src.getBytes()));
}
public void ccMD2() {
System.out.println("CC MD2 : " + DigestUtils.md2Hex(src.getBytes()));
}
}
commons.codec需maven引入：
<dependency>
<groupId>org.apache.directory.studio</groupId>
<artifactId>org.apache.commons.codec</artifactId>
<version>1.8</version>
</dependency>
SHA的3种算法
package com.example.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.junit.jupiter.api.Test;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class optest3 {
private static String src = "ruhuashop.com";
@Test
public void index() {
System.out.println("开始");
jdkSHA1();
System.out.println("-------------------------------");
bcSHA1();
System.out.println("-------------------------------");
bcSHA224();
System.out.println("-------------------------------");
ccSHA1();
}
public 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();
}
}
public 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));
}
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));
}
public static void ccSHA1() {
System.out.println("cc sha1 - 1 :" + DigestUtils.sha1Hex(src.getBytes()));
System.out.println("cc sha1 - 2 :" + DigestUtils.sha1Hex(src));
System.out.println("cc sha256 :" + DigestUtils.sha256Hex(src));
}
}
HMAC 含有密钥的散列函数算法; 融合MD、SHA
只能由JDK或BC实现
@Test
public void index() {
jdkHmacMD5();
bcHmacMD5();
}
public static void jdkHmacMD5() {
try {
KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5");
//初始化KeyGenerator
SecretKey secretKey = keyGenerator.generateKey();//产生密钥
// byte[] key = secretKey.getEncoded();//获得随机密钥
byte[] key = Hex.decodeHex(new char[]{'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a'});//固定密钥
SecretKey restoreSecretKey = new SecretKeySpec(key, "HmacMD5"); //还原密钥
Mac mac = Mac.getInstance(restoreSecretKey.getAlgorithm()); //实例化MAC
mac.init(restoreSecretKey); // 初始化Mac
byte[] hmacMD5Bytes = mac.doFinal(src.getBytes());//执行摘要
System.out.println("jdk hmacMD5 : " + Hex.encodeHexString(hmacMD5Bytes));
} catch (Exception e) {
e.printStackTrace();
}
}
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);
byte[] hmacMD5Bytes = new byte[hmac.getMacSize()];//执行摘要
hmac.doFinal(hmacMD5Bytes, 0);
System.out.println("bc hmacMD5 : " + org.bouncycastle.util.encoders.Hex.toHexString(hmacMD5Bytes));
}
其他加密算法：
不常用的，如RipeMD、Tiger、Whirlpool、GOST3411 只能用Bouncy Castle实现
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