哈希密码算法问题

Question

I am new in C# wpf programming but I am trying to connect to MySQL database and to hash my password. Unfortunately while I was implementing the algorith I get error in this code:

byte[] plainTextWithSaltBytes = new byte[plainTextBytes.Length + saltBytes.Length];
salt.CopyTo(plainTextWithSaltBytes, 0);
plainText.CopyTo(plainTextWithSaltBytes, salt.Length); 

The error is:

Error: no overload for method 'Copy To' takes 2 arguments Exceptions: System.ArgumentNullException System.ArgumentOutOfRangeException
enter code here

By any chance do you know what is causing this errors and how to fix it?

Answer 1

You need to copy plainTextBytes , not plainText :

   byte[] plainTextWithSaltBytes = new byte[plainTextBytes.Length + saltBytes.Length];
   salt.CopyTo(plainTextWithSaltBytes, 0);
   plainTextBytes.CopyTo(plainTextWithSaltBytes, salt.Length); 

Answer 2

If you need to do simple hash, this bit of code may encrypt your password:

String GetEncryptedPassword (String prmUser, String prmPassword)
{
    // Concatenating the password and user name.
    String encryptedPassword = prmUserName + prmPassword;

    // Converting into the stream of bytes.
    Byte[] passInBytes = Encoding.UTF8.GetBytes(encryptedPassword);

    // Encrypting using SHA1 encryption algorithm.
    passInBytes = SHA1.Create().ComputeHash(passInBytes);

    // Formatting every byte into %03d to make a fixed length 60 string.
    return passInBytes.Aggregate(String.Empty, (pass, iter) => pass += String.Format("{0:000}", iter));
}

This code will give you a nice encrypted hash of 60 characters. But remember that you can't regenerate your original username and password from the hash, because this is a one way algorithm. There are few more encryption algorithms in System.Security.Cryptography that you can use.