root/tools/routingservice/trunk/src/jp/co/orkney/restlet/security/MD5SecurityHelper.java

package jp.co.orkney.restlet.security;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import jp.co.orkney.restlet.util.Log;

public class MD5SecurityHelper {
        public static boolean checkAPIKey(String clientId, String signature,
                        String apiKey, String secretKey, Log log)
                        throws NoSuchAlgorithmException {
                boolean isValid = false;
                boolean verifies = false;

                MessageDigest algorithm = MessageDigest.getInstance("MD5");
                
                log.write("clientId = " + clientId + ", apiKey = "+apiKey + ", secretKey = " +secretKey, 2);

                log.write(signature +" == " + getHash(clientId, algorithm), 2);
                log.write(apiKey +" == " + getHash(clientId+secretKey, algorithm), 2);
                
                verifies = signature.equals(getHash(clientId, algorithm));
                isValid = apiKey.equals(getHash(clientId+secretKey, algorithm));

                return isValid && verifies;
        }

        private static String getHash(String input, MessageDigest algorithm) {

                algorithm.reset();

                algorithm.update(input.getBytes());
                byte[] messageDigest = algorithm.digest();
                StringBuffer hexString = new StringBuffer();

                for (int i = 0; i < messageDigest.length; i++) {
                        String hex = Integer.toHexString(0xFF & messageDigest[i]);
                        if (hex.length() == 1) {
                                hexString.append('0');
                        }
                        hexString.append(hex);
                }
                return hexString.toString();
        }

}