namespace Microsoft.AspNet.Identity{	public class PasswordHasher : IPasswordHasher	{		public virtual string HashPassword(string password)		{			return Crypto.HashPassword(password);		}		public virtual PasswordVerificationResult VerifyHashedPassword(string hashedPassword, string providedPassword)		{			if (Crypto.VerifyHashedPassword(hashedPassword, providedPassword))			{				return PasswordVerificationResult.Success;			}			return PasswordVerificationResult.Failed;		}	}}

using System;using System.Runtime.CompilerServices;using System.Security.Cryptography;namespace Microsoft.AspNet.Identity{	internal static class Crypto	{		private const int PBKDF2IterCount = 1000;		private const int PBKDF2SubkeyLength = 32;		private const int SaltSize = 16;		public static string HashPassword(string password)		{			if (password == null)			{				throw new ArgumentNullException("password");			}			byte[] salt;			byte[] bytes;			using (Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, 16, 1000))			{				salt = rfc2898DeriveBytes.Salt;				bytes = rfc2898DeriveBytes.GetBytes(32);			}			byte[] array = new byte[49];			Buffer.BlockCopy(salt, 0, array, 1, 16);			Buffer.BlockCopy(bytes, 0, array, 17, 32);			return Convert.ToBase64String(array);		}		public static bool VerifyHashedPassword(string hashedPassword, string password)		{			if (hashedPassword == null)			{				return false;			}			if (password == null)			{				throw new ArgumentNullException("password");			}			byte[] array = Convert.FromBase64String(hashedPassword);			if (array.Length != 49 || array[0] != 0)			{				return false;			}			byte[] array2 = new byte[16];			Buffer.BlockCopy(array, 1, array2, 0, 16);			byte[] array3 = new byte[32];			Buffer.BlockCopy(array, 17, array3, 0, 32);			byte[] bytes;			using (Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, array2, 1000))			{				bytes = rfc2898DeriveBytes.GetBytes(32);			}			return Crypto.ByteArraysEqual(array3, bytes);		}		[MethodImpl(MethodImplOptions.NoOptimization)]		private static bool ByteArraysEqual(byte[] a, byte[] b)		{			if (object.ReferenceEquals(a, b))			{				return true;			}			if (a == null || b == null || a.Length != b.Length)			{				return false;			}			bool flag = true;			for (int i = 0; i < a.Length; i++)			{				flag &= (a[i] == b[i]);			}			return flag;		}	}}