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122 lines (100 loc) · 2.82 KB
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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>