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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>1.18. java.security</title><link rel="stylesheet" type="text/css" href="/docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="index.html" title="Netkiller Java 手札" /><link rel="up" href="java.html" title="第 1 章 Java 12" /><link rel="prev" href="javax/crypto/index.html" title="1.17. Crypto" /><link rel="next" href="build/index.html" title="第 2 章 Build Tools" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> |
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<a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.18. java.security</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="javax/crypto/index.html">上一页</a> </td><th width="60%" align="center">第 1 章 Java 12</th><td width="20%" align="right"> <a accesskey="n" href="build/index.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="java.security"></a>1.18. java.security</h2></div></div></div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Security.getAlgorithms"></a>1.18.1. 列出 Java 支持的数字摘要算法</h3></div></div></div>
<pre class="programlisting">
package cn.netkiller.security;
import java.security.Security;
import java.util.Set;
public class ListMessageDigest {
public static void main(String[] args) {
// List of available MessageDigest Algorithms
Set<String> messageDigest = Security.getAlgorithms("MessageDigest");
messageDigest.forEach(x -> System.out.println(x));
}
}
</pre>
<p>运行结果</p>
<pre class="screen">
SHA3-512
SHA-384
SHA
SHA3-384
SHA-224
SHA-512/256
SHA-256
MD2
SHA-512/224
SHA3-256
SHA-512
MD5
SHA3-224
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="filesum"></a>1.18.2. 计算文件的 MD5，SHA 等 HASH 值</h3></div></div></div>
<pre class="programlisting">
package cn.netkiller.security;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class sha1sum {
public sha1sum() {
// TODO Auto-generated constructor stub
}
public static void main(String[] args) throws NoSuchAlgorithmException, IOException {
String hex = checksum("/etc/hosts");
System.out.println(hex);
}
private static String checksum(String filepath) throws IOException, NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("SHA"); // SHA, MD2, MD5, SHA-256, SHA-384...
// file hashing with DigestInputStream
try (DigestInputStream dis = new DigestInputStream(new FileInputStream(filepath), md)) {
while (dis.read() != -1)
; // empty loop to clear the data
md = dis.getMessageDigest();
}
// bytes to hex
StringBuilder result = new StringBuilder();
for (byte b : md.digest()) {
result.append(String.format("%02x", b));
}
return result.toString();
}
}
</pre>
</div>
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