如何验证哈希密码？

Question

我使用以下代码使用PBKDF2对密码进行哈希：

private string HashPassword(string password)
        {
            // generate a 128-bit salt using a secure PRNG
            byte[] salt = new byte[128 / 8];
            using (var rng = RandomNumberGenerator.Create())
            {
                rng.GetBytes(salt);
            }

            // derive a 256-bit subkey (use HMACSHA1 with 10,000 iterations)
            string hashedPassword = Convert.ToBase64String(KeyDerivation.Pbkdf2(
                password: password,
                salt: salt,
                prf: KeyDerivationPrf.HMACSHA1,
                iterationCount: 10000,
                numBytesRequested: 256 / 8));

            return hashedPassword;
        }

如何验证身份验证的密码？看来我需要拿到用来哈希密码的盐。我怎么拿到？请注意，我没有使用单独的字段来存储哈希。数据库中只存储散列密码。

Answer 1

一种可能的选择是使用Microsoft.aspnet.Identity中的PasswordHasher。

c# prettyprint-override">var passwordHasher = new PasswordHasher();
var pass = "password";
var hash = passwordHasher.HashPassword(pass);
var isVerified = passwordHasher.VerifyHashedPassword(hash, pass) 
              != PasswordVerificationResult.Failed;
Console.WriteLine((isVerified ? "Verified" : "Not verified"));