java加密与解密

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1、摘要： java加密与解密，java秘钥体系摘要算法摘要算法主要包含三大类型：MD算法，SHA算法，已经基于KEY的MAC算法MD算法MD算法主要有MD2，MD3，MD4以及最常用的MD5。SHA算法主要有SHA-1，SHA-224，SHA-256，SHA-384，SHA-512。MAC算法是基于哈西散列算法（MD系列或者SHA系列等），在HASH散列进行KEY加密JAVA密码体系对主流摘要算法的支持MD5算法的调用示例packagecom.rcl.platform.demo;importjava.security.InvalidKeyException;importjava.security

2、.MessageDigest;importjava.security.NoSuchAlgorithmException;importjava.security.NoSuchProviderException;importjava.security.Provider;importjava.security.Security;importjavax.crypto.Mac;importjavax.crypto.SecretKey;importjavax.crypto.spec.SecretKeySpec;importorg.bouncycastle.jce.provider.BouncyCastle

3、Provider;publicclassProviderTest{publicstaticvoidmain(String[]args)throwsNoSuchAlgorithmException,NoSuchProviderException,InvalidKeyException{MessageDigestmessageDigest=MessageDigest.getInstance("MD5");messageDigest.update("我是MD".getBytes());byte[]md5=messageDigest.digest();System.out.println(byte2H

4、exStr(md5));Security.addProvider(newBouncyCastleProvider());//注册BouncyCastleProviderProviderprovider=Security.getProvider("BC");messageDigest=MessageDigest.getInstance("MD4",provider);messageDigest.update("我是MD".getBytes());byte[]md4=messageDigest.digest();System.out.println(byte2HexStr(md4));messag

5、eDigest=MessageDigest.getInstance("SHA512");//调用SHA算法messageDigest.update("我是SHA".getBytes());byte[]sha512=messageDigest.digest();System.out.println(byte2HexStr(sha512));SecretKeysecretKey=newSecretKeySpec("woshikey".getBytes(),"HmacSHA512");//HMAC算法调用Macmac=Mac.getInstance(secretKey.getAlgorithm())

6、;mac.init(secretKey);byte[]hmacSHA224=mac.doFinal("我是SHA".getBytes());System.out.println(byte2HexStr(hmacSHA224));}publicstaticStringbyte2HexStr(byte[]b){Stringstmp="";StringBuildersb=newStringBuilder("");for(intn=0;n

7、+stmp:stmp);sb.append("");}returnsb.toString().toLowerCase().trim();}}执行结果f610c6a17a31eec9d36c5ef646149ea6d40694ae1650fdb9bfe807833a3b6c89e7046e9687398575eadf7eadf5854103b9a98fbedc1333cd553bc288b3518f