我正在实施ASP.NET MVC3应用程序的安全性，并使用这里找到的BCrypt实现来处理密码的加密和验证。用户注册屏幕可以很好地加密用户提供的密码，哈希密码也会保存到数据库中。然而，在登录页面上进行密码验证时出现了问题，我似乎无法弄清原因。
我的注册控制器操作包含以下内容：
CredentialsAreValid将调用BCrypt.CheckPassword进行验证：
我的注册控制器操作包含以下内容：
[HttpPost]
[RequireHttps]
public ActionResult Register(Registration registration)
{
// Validation logic...
try
{
var user = new User
{
Username = registration.Username,
Password = Password.Hash(HttpUtility.HtmlDecode(registration.Password)),
EmailAddress = registration.EmailAddress,
FirstName = registration.FirstName,
MiddleInitial = registration.MiddleInitial,
LastName = registration.LastName,
DateCreated = DateTime.Now,
DateModified = DateTime.Now,
LastLogin = DateTime.Now
};
var userId = _repository.CreateUser(user);
}
catch (Exception ex)
{
ModelState.AddModelError("User", "Error creating user, please try again.");
return View(registration);
}
// Do some other stuff...
}
这是 Password.Hash：
public static string Hash(string password)
{
return BCrypt.HashPassword(password, BCrypt.GenerateSalt(12));
}
这是我处理登录的方式：
[HttpPost]
[RequireHttps]
public ActionResult Login(Credentials login)
{
// Validation logic...
var authorized = _repository.CredentialsAreValid(HttpUtility.HtmlDecode(login.username), login.password);
if (authorized)
{
// log the user in...
}
else
{
ModelState.AddModelError("AuthFail", "Authentication failed, please try again");
return View(login);
}
}
CredentialsAreValid将调用BCrypt.CheckPassword进行验证：
public bool CredentialsAreValid(string username, string password)
{
var user = GetUser(username);
if (user == null)
return false;
return Password.Compare(password, user.Password);
}
Password.Compare:
public static bool Compare(string password, string hash)
{
return BCrypt.CheckPassword(password, hash);
}
最后，这就是BCrypt.CheckPassword在做什么：
public static bool CheckPassword(string plaintext, string hashed)
{
return StringComparer.Ordinal.Compare(hashed, HashPassword(plaintext, hashed)) == 0;
}
所以，是的...我不知道发生了什么，但我知道的是，在我的登录控制器操作中，我的布尔变量authorized总是返回false，原因不明。
我在过去的至少几个项目中都使用了这个完全相同的BCrypt类，并且从来没有遇到任何问题。ASP.NET MVC 3是否对发布的数据进行了一些奇怪的、不同的编码，而我又错过了或需要以不同的方式处理它？还是SQL CE 4在这样做（那是我目前正在使用的数据存储）？从我所能看到的代码来看，一切似乎都很正常，但由于某种原因，密码检查每次都失败。有人有什么想法吗？
谢谢。
更新：这里是附带BCrypt类的代码注释，包括如何使用和工作的示例。
/// <summary>BCrypt implements OpenBSD-style Blowfish password hashing
/// using the scheme described in "A Future-Adaptable Password Scheme"
/// by Niels Provos and David Mazieres.</summary>
/// <remarks>
/// <para>This password hashing system tries to thwart offline
/// password cracking using a computationally-intensive hashing
/// algorithm, based on Bruce Schneier's Blowfish cipher. The work
/// factor of the algorithm is parametized, so it can be increased as
/// computers get faster.</para>
/// <para>To hash a password for the first time, call the
/// <c>HashPassword</c> method with a random salt, like this:</para>
/// <code>
/// string hashed = BCrypt.HashPassword(plainPassword, BCrypt.GenerateSalt());
/// </code>
/// <para>To check whether a plaintext password matches one that has
/// been hashed previously, use the <c>CheckPassword</c> method:</para>
/// <code>
/// if (BCrypt.CheckPassword(candidatePassword, storedHash)) {
/// Console.WriteLine("It matches");
/// } else {
/// Console.WriteLine("It does not match");
/// }
/// </code>
/// <para>The <c>GenerateSalt</c> method takes an optional parameter
/// (logRounds) that determines the computational complexity of the
/// hashing:</para>
/// <code>
/// string strongSalt = BCrypt.GenerateSalt(10);
/// string strongerSalt = BCrypt.GenerateSalt(12);
/// </code>
/// <para>
/// The amount of work increases exponentially (2**log_rounds), so
/// each increment is twice as much work. The default log_rounds is
/// 10, and the valid range is 4 to 31.
/// </para>
/// </remarks>