package jp.co.y_net.amm.common;

 import java.security.MessageDigest;

 import java.security.NoSuchAlgorithmException;

 public class CalcHash {

 //    private static int STRETCH_COUNT = 500;

     public static String passowrdHash(String password, String account) {

 //        String salt = getSha256(loginId);

 //        String hash = "";

 //

 //        for (int i = 0; i < STRETCH_COUNT; i++) {

 //            hash = getSha256(hash + salt + password);

 //        }

 //        return hash;

         return getSha256(account+":"+password);

     }

     public static String challengeResponse(String phash, String chvalue) {

         //return getSha256(passwordHash + challenge);

         return getSha256(phash+":"+chvalue);

     }

     /*

      * 文字列から SHA256 のハッシュ値を取得

      */

     private static String getSha256(String target) {

         MessageDigest md = null;

         StringBuilder buf = new StringBuilder();

         try {

             md = MessageDigest.getInstance("SHA-256");

             md.update(target.getBytes());

             byte[] digest = md.digest();

             for (int i = 0; i < digest.length; i++) {

                 buf.append(String.format("%02x", digest[i]));

             }

         } catch (NoSuchAlgorithmException e) {

             throw new RuntimeException(e);

         }

         return buf.toString();

     }

     /*---------------------------------------------------------------------------------------------------------------*/

     /* 単体テスト*/

     public static void main(String[] args) {

         System.out.println(passowrdHash("p@ssw0rd", "ryoma.sakamoto@example.com"));

         System.out.println(passowrdHash("test", "kondou@example.com"));

         System.out.println(passowrdHash("testtest", "okita@example.com"));

         System.out.println(passowrdHash("testtest", "admin"));

     }

 }