messagedigestfactory.java

来自「这是一个以JAVA编写的程序,本人还没有试过,是一个简单的温度控制系统」· Java 代码 · 共 40 行

package net.sf.dz.util;

import java.io.ByteArrayOutputStream;
import java.io.PrintWriter;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MessageDigestFactory {

    public String getSHA(String message) throws NoSuchAlgorithmException {
    
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        MessageDigest sha = MessageDigest.getInstance("SHA");
        DigestOutputStream dos = new DigestOutputStream(baos, sha);
        PrintWriter pw = new PrintWriter(dos);
        
        pw.print(message);
        pw.flush();
        
        byte md[] = dos.getMessageDigest().digest();
        
        StringBuffer sb = new StringBuffer();
        
        for ( int offset = 0; offset < md.length; offset++ ) {
        
            byte b = md[offset];
            
            if ( (b & 0xF0) == 0 ) {
            
                sb.append("0");
            }
            
            sb.append(Integer.toHexString((int)(b & 0xFF)));
        }
        
        return sb.toString();
    }
}