SecretKeyFactory.getInstance(“PBKDF2WithHmacSHA512”)抛出NoSuchAlgorithmException

时间:2013-12-27 20:50:16

标签: java algorithm security sha

经过一些研究和一些工作,我终于能够对密码进行哈希密码现在有一个问题,我想我已经使用了SHA1方法,我想尝试使用SHA512,因为我是告诉它更好(更安全)所以以下是我的代码它有点到处都是,但我认为它是可理解的:

public class Safety
{
   //calling some parameters for possible later changes
   public static final String algorithm = "PBKDF2WithHmacSHA1";
   public static final int saltbytesize = 24;
   public static final int hashbytesize = 24;
   public static final int iterations = 1000;
   public static final int iIndex = 0;
   public static final int sIndex = 1;
   public static final int pbkIndex = 2;

   public static Users passwordHash(Users user) throws NoSuchAlgorithmException,
                                                       InvalidKeySpecException
   {
      SecureRandom sR = new SecureRandom();

      byte[] pws = new byte[saltbytesize];

      sR.nextBytes(pws);
      byte[] pwh = pbkdf2(user.getPassword().toCharArray(), pws, iterations, hashbytesize);

      user.setPassword(toHex(pwh));

      byte[] sas = new byte[saltbytesize];

      sR.nextBytes(sas);

      byte[] sah = pbkdf2(user.getsA().toCharArray(), sas, iterations, hashbytesize);

      user.setsA(toHex(sah));

      user.setUserhash(pws);

      user.setSahash(sas);

      return user;
   }

   public static boolean hashpassword(String username, String password, Users user)
   throws NoSuchAlgorithmException,
          InvalidKeySpecException
   {
      byte[] pws = user.getUserhash();

      byte[] pwh = pbkdf2(password.toCharArray(), pws, iterations, hashbytesize);

      String searcher = toHex(pwh) + username;

      String searched = user.getPassword() + user.getUsername();

      if (searcher.equals(searched))
      {
         return true;
      }
      return false;
   }

   private static byte[] pbkdf2(char[] password, byte[] salt,
                                int iterations, int bytes)
      throws NoSuchAlgorithmException, InvalidKeySpecException
   {
      PBEKeySpec spec = new PBEKeySpec(password, salt, iterations, bytes * 8);
      SecretKeyFactory skf = SecretKeyFactory.getInstance(algorithm);
      return skf.generateSecret(spec).getEncoded();
   }

   private static String toHex(byte[] array)
   {
      BigInteger bi = new BigInteger(1, array);

      String hex = bi.toString(16);

      int paddingLength = (array.length * 2) - hex.length();

      if (paddingLength > 0)
         return String.format("%0" + paddingLength + "d", 0) + hex;
      else
         return hex;
   }
}

所以这是我的代码,但是,我还没有能够制作SHA512并且我已经尝试public static final String algorithm = "PBKDF2WithHmacSHA512"但是这似乎不是算法的正确字符串,因为它抛出了没有这样的算法异常。

我也欢迎任何可以使代码更好的更改。

如上所述! 相关的几行代码

  
    
      
        
          

public static final String algorithm =“PBKDF2WithHmacSHA512”<<<<<<<

        
      
    
  

1 个答案:

答案 0 :(得分:2)

无法开箱即用

OpenJDK实现仅提供PBKDF2HmacSHA1Factory.java,其中包含“HmacSHA1”摘要。就我测试而言,Oracle JDK在这个意义上并没有什么不同。

你需要做的是派生PBKDF2HmacSHA1Factory(来吧,它是打开!)并在其构造函数中添加一个参数。您可以避免创建自己的Provider,并按照以下步骤初始化和使用工厂:

PBKDF_SecretKeyFactory kf = new PBKDF_SecretKeyFactory("HmacSHA512");
KeySpec ks = new PBEKeySpec(password,salt,iterations,bitlen);
byte key[] = kf.engineGenerateSecret(ks).getEncoded();