59 lines
2.8 KiB
C#
59 lines
2.8 KiB
C#
/*************************************************************************
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* ModernUO *
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* Copyright 2019-2020 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: PBKDF2PasswordProtection.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Buffers.Binary;
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using System.Security.Cryptography;
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using Server.Text;
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namespace Server.Accounting.Security
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{
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public class PBKDF2PasswordProtection : IPasswordProtection
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{
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private const ushort m_MinIterations = 1024;
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private const ushort m_MaxIterations = 1536;
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private const int m_SaltSize = 8;
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private const int m_HashSize = 32;
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private const int m_OutputSize = 2 + m_SaltSize + m_HashSize;
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public static readonly IPasswordProtection Instance = new PBKDF2PasswordProtection();
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public string EncryptPassword(string plainPassword)
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{
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Span<byte> output = stackalloc byte[m_OutputSize];
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var iterations = Utility.RandomMinMax(m_MinIterations, m_MaxIterations);
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BinaryPrimitives.WriteUInt16LittleEndian(output.Slice(0, 2), (ushort)iterations);
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var rfc2898 = new Rfc2898DeriveBytes(plainPassword, m_SaltSize, iterations, HashAlgorithmName.SHA256);
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rfc2898.Salt.CopyTo(output.Slice(2, m_SaltSize));
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rfc2898.GetBytes(m_HashSize).CopyTo(output.Slice(m_SaltSize + 2));
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return output.ToHexString();
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}
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public bool ValidatePassword(string encryptedPassword, string plainPassword)
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{
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Span<byte> encryptedBytes = stackalloc byte[m_OutputSize];
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HexStringConverter.GetBytes(encryptedPassword, encryptedBytes);
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var iterations = BinaryPrimitives.ReadUInt16LittleEndian(encryptedBytes.Slice(0, 2));
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var salt = encryptedBytes.Slice(2, m_SaltSize);
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ReadOnlySpan<byte> hash =
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new Rfc2898DeriveBytes(plainPassword, salt.ToArray(), iterations, HashAlgorithmName.SHA256).GetBytes(m_HashSize);
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return hash.SequenceEqual(encryptedBytes.Slice(m_SaltSize + 2));
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}
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}
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}
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