我正在努力在 ASP.NET MVC 3 应用程序中实现安全性，并且正在使用此处找到的 BCrypt 实现来处理密码的加密和验证。用户注册屏幕对用户提供的密码进行了很好的加密，散列后的密码被保存到数据库中。我在登录页面上的密码验证出现问题，我似乎无法弄清楚原因。
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...
}
这是密码。哈希：
public static string Hash(string password)
{
return BCrypt.HashPassword(password, BCrypt.GenerateSalt(12));
}
这就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 包装了对 BCrypt.CheckPassword 的调用：
public bool CredentialsAreValid(string username, string password)
{
var user = GetUser(username);
if (user == null)
return false;
return Password.Compare(password, user.Password);
}
密码。比较：
public static bool Compare(string password, string hash)
{
return BCrypt.CheckPassword(password, hash);
}
最后，这就是 BCrypt.CheckPassword 正在做的事情：
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，我authorized的登录控制器操作中的布尔变量由于某种原因总是返回 false。
我过去至少在其他几个项目中使用过这个完全相同的 BCrypt 类，而且从来没有遇到过任何问题。ASP.NET MVC 3 是否对我丢失或需要以不同方式处理的已发布数据进行了一些奇怪的、不同的编码？是这样，还是 SQL CE 4 正在这样做（这是我当前使用的数据存储）？据我所知，我的代码中的一切似乎都是有序的，但由于某种原因，密码检查每次都失败。有人有想法么？
谢谢。
更新：这是包含在 BCrypt 类中的代码注释以及它的使用和工作示例。
/// <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>