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72 lines
3.0 KiB
72 lines
3.0 KiB
#region Copyright
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// /************************************************************************
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// Copyright (c) 2016 Jamie Rees
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// File: PasswordHasher.cs
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// Created By: Jamie Rees
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in 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,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// ************************************************************************/
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#endregion
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using System.Collections.Generic;
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using System.Security.Cryptography;
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namespace Ombi.Helpers
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{
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public static class PasswordHasher
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{
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// 24 = 192 bits
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private const int SaltByteSize = 24;
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private const int HashByteSize = 24;
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private const int HasingIterationsCount = 10101;
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public static byte[] ComputeHash(string password, byte[] salt, int iterations = HasingIterationsCount, int hashByteSize = HashByteSize)
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{
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var hashGenerator = new Rfc2898DeriveBytes(password, salt) { IterationCount = iterations };
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return hashGenerator.GetBytes(hashByteSize);
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}
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public static byte[] GenerateSalt(int saltByteSize = SaltByteSize)
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{
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var saltGenerator = new RNGCryptoServiceProvider();
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var salt = new byte[saltByteSize];
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saltGenerator.GetBytes(salt);
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return salt;
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}
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public static bool VerifyPassword(string password, byte[] passwordSalt, byte[] passwordHash)
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{
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var computedHash = ComputeHash(password, passwordSalt);
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return AreHashesEqual(computedHash, passwordHash);
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}
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//Length constant verification - prevents timing attack
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private static bool AreHashesEqual(IReadOnlyList<byte> firstHash, IReadOnlyList<byte> secondHash)
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{
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var minHashLength = firstHash.Count <= secondHash.Count ? firstHash.Count : secondHash.Count;
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var xor = firstHash.Count ^ secondHash.Count;
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for (var i = 0; i < minHashLength; i++)
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xor |= firstHash[i] ^ secondHash[i];
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return 0 == xor;
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}
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}
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}
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