Tutorial [Text Tutorial] SHA-512 Encryption Handling of User Credentials [Text Tutorial]

[Tutorial] [Text Tutorial] SHA-512 Encryption Handling of User Credentials [Text Tutorial] - Printable Version

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[Text Tutorial] SHA-512 Encryption Handling of User Credentials [Text Tutorial] - KodaKing - Mar 2, 2018

The IDEcrashers Guide To Handling Salted Hash Algorithms for User Credentials in a Terminal Environment
Ω-:[KodaKing]:-Ω

The System.Security library maintains the System.Security.Cryptography nested class.
When hashing encryptions from user input, this can assist in more descrete authorization handling.

Code 
using System;

using System.Console;

using System.Collections.Generic;

using System.Security;

using System.Security.Cryptography;

using System.Linq;

using System.IO;

When dealing with the Hash support it is necessary to determine the algorithm of choice.
I will be using SHA-512 enencryption.
For this lesson, I will stick to simply accessing an unprotected text file in /Documents for both the Username hash-table and the Password has-table.

Within a Command Line interface we should first prompt the user for desired activity.

Code 
System.Console.WriteLine("Welcome!");

            System.Console.WriteLine("Are You A New User Or Returning?");

            string input1 = System.Console.ReadLine();

After we have set for the input, we can handle a new User Key-Pairing and output the pair to a text document.

First we need to recieve out UTF-8 Username input and Password input from our new User.

Code 
               byte[] UsrData = Encoding.UTF8.GetBytes(Usr);

                byte[] shaHash;

                byte[] shaPwdHash;

For encryption of the SHA512 algorithm, we will create a new SHA512 instance and name the method shaWoah to be follow a new Managed function call.

Now convert the bytecode to a SHA512 hash.

Code 
  SHA512 shaWoah = new SHA512Managed();

                shaHash = shaWoah.ComputeHash(UsrData);

Having completed the first encryption hash, we can implement the same process for our password.

Code 
byte[] PwdData = Encoding.UTF8.GetBytes(Pwd);

                SHA512 shaYou = new SHA512Managed();

                shaPwdHash = shaYou.ComputeHash(PwdData);

After we have encrypted both the Username and Password, we may now transfer them to desired text file locations.

You can determine any path for your text file.

I will be converting my SHA 512 hash to a base64 string to provide a textual value.

Code 
string InMy64 = Convert.ToBase64String(shaHash);

                System.Console.WriteLine(InMy64);

                string OnThat11 = Convert.ToBase64String(shaPwdHash);

                System.Console.WriteLine(OnThat11);

                using (StreamWriter outputUsr = new StreamWriter(@"C:\Users\Naye\Documents\Usrnames.txt", true))

                {

                    outputUsr.WriteLine(InMy64);

                }

                using (StreamWriter outputPass = new StreamWriter(@"C:\Users\Naye\Documents\Pwds.txt", true))

                {

                    outputPass.WriteLine(OnThat11);

                }

Now, we can simply say nice words to the User.

Code 
System.Console.WriteLine("Your Information Has Been Written To The File System!");

For returning Users we will need to parse their input and authenticate.

Code 
System.Console.WriteLine("Welcome! Please Input Your Username: ");

               string Usr = Console.ReadLine();

               System.Console.WriteLine("Thank You! Please Input Your Passkey Information: ");

               string Pwd = Console.ReadLine();

Once again, to hash the encryption we must convert to bytecode from our UTF-8 input string.

Code 
byte[] UsrData = Encoding.UTF8.GetBytes(Usr);

               byte[] shaHash;

               byte[] shaPwdHash;

               SHA512 shaWoah = new SHA512Managed();

               shaHash = shaWoah.ComputeHash(UsrData);

               byte[] PwdData = Encoding.UTF8.GetBytes(Pwd);

               SHA512 shaYou = new SHA512Managed();

               shaPwdHash = shaYou.ComputeHash(PwdData);

               string InMy64 = Convert.ToBase64String(shaHash);

               string OnThat11 = Convert.ToBase64String(shaPwdHash);

To check the index of our key-pair, we will implement the StreamReader method and load our text file of Hashes to it.
With a boolean operation we can check the relation of the indexes.

Code 
int userindexglobal = 0;

               using (StreamReader usrread = new StreamReader(@"C:\Users\Naye\Documents\Usrnames.txt", true))

               {

                   string contents = usrread.ReadToEnd();

                   if (contents.Contains(InMy64))

                   {

                       System.Console.WriteLine("Thank You!");

                       goto UsrIndex;

                   }

                   else

              {

    Console.WriteLine("We're Sorry, Your Username Was Not Found To Be Valid.");

                       goto LogIn;

                   }

At this point, we will save the index location of the individual input credentials.

Code 
UsrIndex:

                   userindexglobal = contents.IndexOf(InMy64);

                   goto Pass;

               }

               Pass:

               int passindexglobal = 0;

               bool usrAuth = true;

           using (StreamReader pwdread = new StreamReader(@"C:\Users\Naye\Documents\Pwds.txt", true))

               {

                string contents = pwdread.ReadToEnd();       

               if(contents.Contains(OnThat11))

                   {

                       System.Console.WriteLine("We Appreciate You Following These Security Formalities. Thank You, Once Again!");

                       goto PassIndex;

                   }

                   else

                   {

                       Console.WriteLine("We're Sorry Your Passkey Did Not Authorize.");

                       goto Start;

                   }

                   PassIndex:

                   passindexglobal = contents.IndexOf(OnThat11);

                   goto Auth;

               }

Now we get to our final Authentication.
By passing the boolean we can validate the key-pair.

Code 
Auth:

               bool passAuth = true;

               bool doesit = usrAuth == passAuth;

               if (doesit == true && userindexglobal==passindexglobal)

               {

                   goto MainSubLoop;

               }

If we are unable to verify the Username and Password combination, we will need to alert the User and determine a new life-cycle path.
For such a task, I will display an error message to the console and relay back to the program's initialization.

Code 
else

               {

                   Console.WriteLine("Authorization Did Not Occur. Looping Cycle.");

                   goto Start;

               }

With Authentication completed we get to deeper and more amusing things.