Asp.net中Microsoft.Identity的IPasswordHasher加密的默认实现与运用

// Decompiled with JetBrains decompiler
// Type: Microsoft.AspNet.Identity.Crypto
// Assembly: Microsoft.AspNet.Identity.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
// MVID: E3A10FFD-023A-4BC3-AD53-32D145ABF1C9
// Assembly location: C:\Sport\NewProject\V2.0\Api\Fantasy.Sport\packages\Microsoft.AspNet.Identity.Core.2.2.1\lib\net45\Microsoft.AspNet.Identity.Core.dll
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[] inArray = new byte[49];
  Buffer.BlockCopy((Array) salt, 0, (Array) inArray, 1, 16);
  Buffer.BlockCopy((Array) bytes, 0, (Array) inArray, 17, 32);
  return Convert.ToBase64String(inArray);
 }
 public static bool VerifyHashedPassword(string hashedPassword, string password)
 {
  if (hashedPassword == null)
  return false;
  if (password == null)
  throw new ArgumentNullException("password");
  byte[] numArray = Convert.FromBase64String(hashedPassword);
  if (numArray.Length != 49 || (int) numArray[0] != 0)
  return false;
  byte[] salt = new byte[16];
  Buffer.BlockCopy((Array) numArray, 1, (Array) salt, 0, 16);
  byte[] a = new byte[32];
  Buffer.BlockCopy((Array) numArray, 17, (Array) a, 0, 32);
  byte[] bytes;
  using (Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt, 1000))
  bytes = rfc2898DeriveBytes.GetBytes(32);
  return Crypto.ByteArraysEqual(a, bytes);
 }
 [MethodImpl(MethodImplOptions.NoOptimization)]
 private static bool ByteArraysEqual(byte[] a, byte[] b)
 {
  if (object.ReferenceEquals((object) a, (object) b))
  return true;
  if (a == null || b == null || a.Length != b.Length)
  return false;
  bool flag = true;
  for (int index = 0; index