79 lines
2.7 KiB
C#
79 lines
2.7 KiB
C#
using System;
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using System.Data.SqlClient;
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using Microsoft.AspNetCore.Cryptography.KeyDerivation;
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namespace SecureCore.Authentication
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{
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public class PasswordManager
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{
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//Add some pepper to the passwords for good measure:
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//https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html
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public static string Pepper { get; } = "rVk/OwQUw01qy76Q+5WimPk+NdqUMMghftMXyJzzckOj/+eFn056PDYzBD61E/ZNjRdgiMK6RhcHEcdfpJdbcw==";
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private static string ConnectionString = @"Server=DESKTOP-OEDDVKC\SQLEXPRESS;Database=main;Integrated Security=true;";
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public PasswordManager()
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{
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}
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public static (string Hash, string Salt) HashPassword(string password)
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{
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var salt = new byte[Settings.SaltSize];
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ByteGenerator.GetRandomBytes(ref salt);
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return (GetHash(password, salt), Convert.ToBase64String(salt));
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}
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public static bool PasswordIsValid(string password, string salt, string passwordHash)
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{
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var saltBytes = Convert.FromBase64String(salt);
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return passwordHash == GetHash(password, saltBytes);
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}
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public static (string PasswordHash, string SaltHash) GetUserPasswordHash(int userId)
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{
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using (var connection = new SqlConnection(ConnectionString))
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{
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using (var command = new SqlCommand("SELECT [Password Hash], [Salt Hash] FROM Login WHERE [User Key] = @UserId", connection))
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{
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command.Parameters.AddWithValue("UserId", userId);
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connection.Open();
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var reader = command.ExecuteReader();
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if (!reader.HasRows) throw new MissingFieldException("No login records exist for this user.");
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reader.Read();
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return (reader["Password Hash"].ToString(), reader["Salt Hash"].ToString());
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}
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}
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}
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public static string HashStringData(string data, byte[] salt = null)
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{
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if (salt == null) salt = new byte[0];
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return GetHash(data, salt);
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}
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public static string HashStringData(string data, string salt = "")
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{
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var saltBytes = new byte[0];
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if(!string.IsNullOrEmpty(salt))
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saltBytes = Convert.FromBase64String(salt);
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return GetHash(data, saltBytes);
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}
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private static string GetHash(string password, byte[] salt)
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{
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return Convert.ToBase64String(KeyDerivation.Pbkdf2($"{password}{Pepper}", salt, Settings.KeyType, Settings.Iterations, Settings.KeySize));
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}
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}
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}
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