Decrypt from SHA256

Question

I have that code to encrypt string to sha256 and next to base64:

 public static string Sha256encrypt(string phrase)
    {
        UTF8Encoding encoder = new          


        

Answer 1

You cannot decrypt the result of a One Way Hash. What you should do instead is compare a hash of the entered password versus the stored hash in the database.

Example:

var password = "1234";
var hashedPassword = Sha256encrypt(password);

var allowLogin = hashedPassword == storedPassword; //storedPassword from Database, etc.

This is only the very basics though, when using hashing algorithms you should consider using a Salt too.