How do I create a SHA256 Hash with Salt?

c#, comparison, hash

Solution

For the first question look at CC Inc's answer.

To the second point: `MessageBox.Show(sha256encrypt(textBox1.Text, "SampleUserName"));`

3) Yes, it is.

You can compare two strings with the `==` comparator or `string.Equals()`.

public bool compareHashs(string hash1, string hash2){
   if(hash1.Equals(hash2) //or hash1 == hash2
      return true;
   }else{
      return false;
   }  
}

Problem

I am currently working on a visual studio C# windows form project. However, I am confused by how SHA256 + salted works. I found some examples online but unable to understand how can I call this function. I would like to call this function in a login form connecting to a database (Microsoft Access 2010). - How do I call this function by a click of a button and reading the password from a `Textbox`? - How do i display out the hash value in a `Messagebox.Show` method? (For my testing purpose) Is it possible to compare two text (hashed and salted) and giving a positive result? ``` public static string sha256encrypt(string phrase, string UserName) { string salt = CreateSalt(UserName); string saltAndPwd = String.Concat(phrase, salt); UTF8Encoding encoder = new UTF8Encoding(); SHA256Managed sha256hasher = new SHA256Managed(); byte[] hashedDataBytes = sha256hasher.ComputeHash(encoder.GetBytes(saltAndPwd)); string hashedPwd = String.Concat(byteArrayToString(hashedDataBytes), salt); return hashedPwd; } public static string byteArrayToString(byte[] inputArray) { StringBuilder output = new StringBuilder(""); for (int i = 0; i < inputArray.Length; i++) { output.Append(inputArray[i].ToString("X2")); } return output.ToString(); } private static string CreateSalt(string UserName) { string username = UserName; byte[] userBytes; string salt; userBytes = ASCIIEncoding.ASCII.GetBytes(username); long XORED = 0x00; foreach (int x in userBytes) XORED = XORED ^ x; Random rand = new Random(Convert.ToInt32(XORED)); salt = rand.Next().ToString(); salt += rand.Next().ToString(); salt += rand.Next().ToString(); salt += rand.Next().ToString(); return salt; } ``` How do I create an SHA256 hash with salt? ``` shavalue = (sha256encrypt("password", "username"); saltedandhashtext = CreateSalt(shavalue); ```

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