[SignGenerator] 生成API签名算法。

sign.php

<?php
/**
 * 签名生产算法。
 * @param  string $sClientID  APP身份ID。
 * @param  string $sUserToken APP生产的可以获得用户标识的令牌。
 * @param  string sSecretKey  秘钥。
 * @return string
 */
function getSign($sClientID, $sUserToken, $sSecretKey)
{
    $tmp1 = base64_encode($sClientID . $sUserToken);
    $tmp2 = substr($tmp1, 0, -2);
    $tmp3 = strrev($tmp2 . $sSecretKey);
    $sign = md5($tmp3);

    return $sign;
}

sign.rb

require 'base64'
require 'digest/md5'

def get_sign client_id, user_token, secret_key
  tmp1 = Base64.encode64(client_id.to_s + user_token).strip
  tmp2 = tmp1[0..tmp1.length - 3]
  tmp3 = (tmp2 + secret_key).reverse
  Digest::MD5.hexdigest tmp3
end

SignGenerator.java

import javax.xml.bind.DatatypeConverter;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SignGenerator
{

    public static void main(String a[])
    {
        // Demo
        String client_id = "liuxd";
        String user_token = "23343we356";
        String secret_key = "15fc7a0b4f050989554e3c9cadc693fd";

        String sign = getSign(client_id, user_token, secret_key);

        System.out.println(sign);
    }

    private static String getSign(String client_id, String user_token, String secret_key)
    {
        String str = client_id + user_token;

        byte[] message = str.getBytes();

        String tmp1 = DatatypeConverter.printBase64Binary(message);
        String tmp2 = tmp1.substring(0, tmp1.length() - 2);
        String tmp3 = tmp2 + secret_key;
        StringBuffer tmp4 = new StringBuffer(tmp3);
        StringBuffer tmp5 = tmp4.reverse();
        String tmp6 = tmp5.toString();
        String tmp7 = MD5(tmp6);

        return tmp7;
    }

    private static String MD5(String sourceStr)
    {
        String result = "";

        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");

            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];

                if (i < 0) {
                    i += 256;
                }

                if (i < 16) {
                    buf.append("0");
                }

                buf.append(Integer.toHexString(i));
            }

            result = buf.toString();
        } catch (NoSuchAlgorithmException e) {
            System.out.println(e);
        }

        return result;
    }
}