/**************************************************************************************** 
 Copyright 漏 2003-2012 ZTEsoft Corporation. All rights reserved. Reproduction or       <br>
 transmission in whole or in part, in any form or by any means, electronic, mechanical <br>
 or otherwise, is prohibited without the prior written consent of the copyright owner. <br>
 ****************************************************************************************/
package com.demo.sso.extension;

import org.springframework.util.StringUtils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import sun.misc.BASE64Encoder;

import org.jasig.cas.authentication.handler.PasswordEncoder;

/** 
 * <Description> <br> 
 *  
 * @author XXX<br>
 * @version 1.0<br>
 * @taskId <br>
 * @CreateDate 2014骞�0鏈�0鏃�<br>
 * @since V1.0<br>
 * @see com.ztesoft.uboss.sso.extension <br>
 */

public class UserPasswordEncoder implements PasswordEncoder {
    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
        '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    private String characterEncoding;
    
    /**
     * Description: <br> 
     *  
     * @author XXX<br>
     * @taskId <br>
     * @param password
     * @return <br>
     */
    public String encode(String password) {
        if (password == null) {
            return null;
        }
        
        try {
            String base64Str = (new BASE64Encoder()).encode(password.getBytes());
            
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        
            if (StringUtils.hasText(this.characterEncoding)) {
                messageDigest.update(base64Str.getBytes(this.characterEncoding));
            } else {
                messageDigest.update(base64Str.getBytes());
            }


            final byte[] digest = messageDigest.digest();

            return getFormattedText(digest);
        
        } catch (final NoSuchAlgorithmException e) {
            throw new SecurityException(e);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }
    /**
     * Takes the raw bytes from the digest and formats them correct.
     *
     * @param bytes the raw bytes from the digest.
     * @return the formatted bytes.
     */
    private String getFormattedText(final byte[] bytes) {
        final StringBuilder buf = new StringBuilder(bytes.length * 2);

        for (int j = 0; j < bytes.length; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }

    public void setCharacterEncoding(final String characterEncoding) {
        this.characterEncoding = characterEncoding;
    }
    
    public static void main(String args[]){
        UserPasswordEncoder s = new UserPasswordEncoder();
        System.out.println(s.encode("111111"));  //e58521190f0e6c8a0f1c4a5294ff1307
    }
}