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
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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。。。。。。
}
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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