JAVA加密与解密.docx

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 package com.rcl.platform.demo; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.Provider; import java.security.Security; import javax.crypto.Mac; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import vider.BouncyCastleProvider; public class ProviderTest { public static void main(String[] args) throws NoSuchAlgorithmException, NoSuchProviderException, InvalidKeyException { MessageDigest messageDigest = MessageDigest.getInstance(MD5); messageDigest.update(我是MD.getBytes()); byte [] md5 = messageDigest.digest(); System.out.println(byte2HexStr(md5)); Security.addProvider(new BouncyCastleProvider());//注册BouncyCastleProvider Provider provider = Security.getProvider(BC); messageDigest = MessageDigest.getInstance(MD4, provider); messageDigest.update(我是MD.getBytes()); byte [] md4 = messageDigest.digest(); System.out.println(byte2HexStr(md4)); messageDigest = MessageDigest.getInstance(SHA512);//调用SHA算法 messageDigest.update(我是SHA.getBytes()); byte [] sha512 = messageDigest.digest(); System.out.println(byte2HexStr(sha512)); SecretKey secretKey = new SecretKeySpec(woshikey.getBytes(), HmacSHA512);//HMAC算法调用 Mac mac = Mac.getInstance(secretKey.getAlgorithm()); mac.init(secretKey); byte [] hmacSHA224 = mac.doFinal(我是SHA.getBytes()); System.out.println(byte2HexStr(hmacSHA224)); } public static String byte2HexStr(byte[] b) { String stmp=; StringBuilder sb = new StringBuilder(); for (int n=0;nb.length;n++)