Java/chapter.java.security.xml at master · freebook/Java · GitHub

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<?xml version="1.0" encoding="UTF-8"?>
<chapter id="index">
	<?dbhtml dir="security"?>
	<title>java.security</title>
	<section id="Security.getAlgorithms">
		<title>列出 Java 支持的数字摘要算法</title>
		<programlisting>
		<![CDATA[
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));

	}

}
		]]>
		</programlisting>
		<para>运行结果</para>
		<screen>
		<![CDATA[
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
		]]>
		</screen>
	</section>
	<section id="filesum">
		<title>计算文件的 MD5，SHA 等 HASH 值</title>
		<programlisting>
		<![CDATA[
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();

	}

}
		]]>
		</programlisting>
	</section>
	<section>
		<title>Md5sum</title>
		<programlisting>
		<![CDATA[
		public String md5sum(String filename) throws NoSuchAlgorithmException, IOException {
			MessageDigest messageDigest = MessageDigest.getInstance("MD5");
			messageDigest.update(Files.readAllBytes(Paths.get(filename)));
			byte[] digest = messageDigest.digest();
			String checksum = DatatypeConverter.printHexBinary(digest).toUpperCase();

			return checksum;

		}

		public boolean checksum() throws NoSuchAlgorithmException {
			String hash = "35454B055CC325EA1AF2126E27707052";
			String password = "ILoveJava";

			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(password.getBytes());
			byte[] digest = md.digest();
			String myHash = DatatypeConverter.printHexBinary(digest).toUpperCase();

			return myHash.equals(hash);

		}
		]]>
		</programlisting>
	</section>
</chapter>