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109 lines
4.3 KiB
C#
109 lines
4.3 KiB
C#
// Copyright (C) 2025, The Duplicati Team
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// https://duplicati.com, hello@duplicati.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Security.Cryptography;
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#nullable enable
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namespace Duplicati.Server;
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/// <summary>
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/// This class is used to store the PBKDF configuration parameters
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/// </summary>
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public record PbkdfConfig(string Algorithm, int Version, string Salt, int Iterations, string HashAlorithm, string Hash)
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{
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/// <summary>
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/// The version to embed in the configuration
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/// </summary>
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private const int _Version = 1;
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/// <summary>
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/// The algorithm to use
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/// </summary>
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private const string _Algorithm = "PBKDF2";
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/// <summary>
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/// The hash algorithm to use
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/// </summary>
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private const string _HashAlorithm = "SHA256";
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/// <summary>
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/// The number of iterations to use
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/// </summary>
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private const int _Iterations = 10000;
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/// <summary>
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/// The size of the hash
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/// </summary>
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private const int _HashSize = 32;
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/// <summary>
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/// Creates a default PBKDF2 configuration
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/// </summary>
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public static PbkdfConfig Default => new PbkdfConfig(_Algorithm, _Version, string.Empty, _Iterations, _HashAlorithm, string.Empty);
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/// <summary>
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/// Creates a new PBKDF2 configuration with a random salt
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/// </summary>
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/// <param name="password">The password to hash</param>
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public static PbkdfConfig CreatePBKDF2(string password)
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{
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var prng = RandomNumberGenerator.Create();
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var buf = new byte[_HashSize];
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prng.GetBytes(buf);
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var salt = Convert.ToBase64String(buf);
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var pwd = Convert.ToBase64String(Rfc2898DeriveBytes.Pbkdf2(password, buf, _Iterations, new HashAlgorithmName(_HashAlorithm), _HashSize));
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return new PbkdfConfig(_Algorithm, _Version, salt, _Iterations, _HashAlorithm, pwd);
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}
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/// <summary>
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/// Calculates the hash for the given password using the current configuration
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/// </summary>
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/// <param name="password">The password to hash</param>
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/// <returns>The hashed password</returns>
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private string ComputeHash(string password)
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{
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return Convert.ToBase64String(Rfc2898DeriveBytes.Pbkdf2(password, Convert.FromBase64String(Salt), Iterations, new HashAlgorithmName(HashAlorithm), _HashSize));
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}
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/// <summary>
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/// Creates a new PBKDF2 configuration with the given password
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/// </summary>
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/// <param name="password">The password to use</param>
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/// <returns>The updated PBKDF2 configuration</returns>
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public PbkdfConfig WithPassword(string password)
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=> WithHash(ComputeHash(password));
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/// <summary>
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/// Creates a new PBKDF2 configuration with the given hash
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/// </summary>
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/// <param name="hash">The hash to use</param>
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/// <returns>The updated PBKDF2 configuration</returns>
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public PbkdfConfig WithHash(string hash)
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=> this with { Hash = hash };
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/// <summary>
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/// Verifies a password against a PBKDF2 configuration
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/// </summary>
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/// <param name="password">The password to verify</param>
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/// <returns>True if the password matches the configuration</returns>
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public bool VerifyPassword(string password)
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=> CryptographicOperations.FixedTimeEquals(Convert.FromBase64String(Hash), Convert.FromBase64String(ComputeHash(password)));
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}
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