hash Name to long value via SHA - Java Security

Java examples for Security:SHA

  1. HOME
  2. Java
  3. Security
  4. SHA

Description

hash Name to long value via SHA

Demo Code

//package com.java2s;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;

public class Main {
    public static void main(String[] argv) {
        String name = "java2s.com";
        System.out.println(hashName(name));
    }/*w  w w .ja  v  a2s .  c  o m*/

    public static long hashName(String name) {
        try {
            long hash = 0;
            ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream(
                    512);
            MessageDigest messagedigest = MessageDigest.getInstance("SHA");
            DataOutputStream dataoutputstream = new DataOutputStream(
                    new DigestOutputStream(bytearrayoutputstream,
                            messagedigest));
            dataoutputstream.writeUTF(name);
            dataoutputstream.flush();
            byte abyte0[] = messagedigest.digest();
            for (int j = 0; j < Math.min(8, abyte0.length); j++)
                hash += (long) (abyte0[j] & 0xff) << j * 8;
            return hash;
        } catch (Exception e) {
            RuntimeException rte = new RuntimeException(e);
            throw rte;
        }

    }
}

Related Tutorials