public bool LoginDecryptionAndValidation(string username, string password) { FileInfo fileInfo = new FileInfo("F:/SAUGUMO TEST CHAMBER4/PasswordSystemFiles/AccountList.txt.aes"); AesEcnryption aesEcnryption = new AesEcnryption(); if (File.Exists("F:/SAUGUMO TEST CHAMBER4/PasswordSystemFiles/AccountList.txt.aes")) { aesEcnryption.FileDecryption(fileInfo); List <LoginValidationConstructcs> validationConstructcs = new List <LoginValidationConstructcs>(); foreach (string line in File.ReadAllLines(fileInfo.FullName.Replace(".aes", ""))) { string[] array = line.Split(','); validationConstructcs.Add(new LoginValidationConstructcs(array[0], array[1])); } foreach (LoginValidationConstructcs loginValidationConstructcs in validationConstructcs) { if (loginValidationConstructcs.username.Equals(username)) { Argon2 argon2 = new Argon2(); string encryptedPSW = aesEcnryption.PasswordEncryption(password); string inputHash = argon2.Argon2Impl(encryptedPSW); if (inputHash.Equals(loginValidationConstructcs.hashValue, StringComparison.Ordinal)) { FileInfo accountList = new FileInfo(fileInfo.FullName.Replace(".aes", "")); aesEcnryption.FileEncryption(accountList); MessageBox.Show("Login Succesfull"); return(true); } } } } MessageBox.Show("Wrong password provided"); FileInfo decryptedFile = new FileInfo(fileInfo.FullName.Replace(".aes", "")); aesEcnryption.FileEncryption(decryptedFile); return(false); }