本文实例讲述了java实现sha算法的方法。分享给大家供大家参考，具体如下：

一 简介

安全散列算法

固定长度摘要信息

二 sha算法

sha-1、sha-2（sha-224、sha-256、sha384、sha-512）

三 sha算法实现

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 package com.imooc.security.sha; 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; public class imoocsha { private static string src = "cakin24 security sha"; public static void main(string[] args) { jdksha1(); bcsha1(); bcsha224(); ccsha1(); } 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(); } } 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)); } 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)); } //384、256、512。。。。。。 }

四 运行结果

jdk sha-1 : ba28a0f5f08efc8afaee4706ffd496e1f88befdb
bc sha-1 : ba28a0f5f08efc8afaee4706ffd496e1f88befdb
bc sha-224 : ae3b58439cd53d28455781fe6dc20c83a45d63e1d9550330c7911f58
cc sha1 - 1 :ba28a0f5f08efc8afaee4706ffd496e1f88befdb
cc sha1 - 2 :ba28a0f5f08efc8afaee4706ffd496e1f88befdb

五 sha算法应用

希望本文所述对大家java程序设计有所帮助。

原文链接：https://blog.csdn.net/chengqiuming/article/details/78760791