Facebook Auth Invalid Hash Key on Flutter?

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  from this code

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      import React from 'react'
      
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      <
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      <
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• how to get facebook app un-restricted when it's missing from the appeal page?

  really weird issue with app id 871708929528215, a restricted app that has been dormant for years, i have fixed the crashing problem they complained about, and facebook SAYS i can "submit an appeal" on https://developers.facebook.com/appeal/ , but the app isn't listed under restricted apps! so i cannot submit an appeal there, how do i get it un-restricted when i cannot submit an appeal? timeline:

  2020-01-19: get a warning from facebook saying:

  (...) Your app 4x4norway.no  (AppId: 871708929528215) doesn't comply with the following:
  
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  • at this point, nobody was maintaining the app and nobody read the message.

  2020-02-26: got this message from facebook

  Your app 4x4norway.no (AppId: 871708929528215) doesn't comply with the following Platform Policies:
  
  Platform Policy 8.1: Verify that you have integrated Login correctly. Your app shouldn't crash or hang during the testing process.
  
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  Access to Facebook Login
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  If you would like to revert this restriction, your app will need to be updated so that it is compliant with the above policy. Once your updates are complete, please submit an appeal here for review: https://developers.facebook.com/appeal/. A member of our team will respond within 48 hours.
  

  • at this point, still, nobody maintaining the app, and nobody reading the message.

  now skip 2 years ahead in time,

  2022-05-06: the code was fixed, login should work now, but the app is NOT listed on the appeal page https://developers.facebook.com/appeal/:

  

  and when i actually try to log in, i get this message:

  facebook login error:
  1349220: Feature Unavailable: Facebook Login is currently unavailable for this app, since we are updating additional details for this app. Please try again later.
  

  so... with the code (presumably) fixed, how do i get it un-restricted when it's not on the appeals page?

  edit: reported the issue to facebook as an apparent bug? ref https://developers.facebook.com/support/bugs/1257714914760781/
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• Same password hash not matching

  I am trying to create and test my api for login using C#. Below is the major part of the code:

  private static void CreatePasswordHash(string password, out byte[] passwordHash, out byte[] passwordSalt)
          {
              using (var hmac = new HMACSHA512())
              {
                  passwordSalt = hmac.Key;
                  passwordHash = hmac.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password));
              }
          }
  
          private static bool VerifyPasswordHash(string password, byte[] passwordHash, byte[] passwordSalt)
          {
              using (var hmac = new HMACSHA512(passwordSalt))
              {
                  var computedHash = hmac.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password));
                  return computedHash.SequenceEqual(passwordHash);
              }
          }
  

  My Db is Mysql 8 with CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci format. Values are stored as varchar(512) so that length is not a problem when saving.

  The code for the DB part for saving data is:

          Cmd.Parameters.Add(new MySqlParameter("@username", MySqlDbType.VarChar)).Value = user.UserName;
          Cmd.Parameters.Add(new MySqlParameter("@passwordhash", MySqlDbType.VarChar)).Value = Convert.ToBase64String(user.PasswordHash);
          Cmd.Parameters.Add(new MySqlParameter("@passwordsalt", MySqlDbType.VarChar)).Value = Convert.ToBase64String(user.PasswordSalt);
  

  The code for retrieving data from db for password check is:

                  while (Rdr.Read() == true)
                  {
                      user.UserName = Rdr.GetString("username");
                      user.PasswordHash = System.Text.Encoding.UTF8.GetBytes(Rdr.GetString("passwordhash"));
                      user.PasswordSalt = System.Text.Encoding.UTF8.GetBytes(Rdr.GetString("passwordsalt"));
                      user.UserID = Rdr.GetInt16("userid");
                  }
                  Rdr.Close();
  

  However when I am doing password match, it is always not matching, could you please help me where I am doing wrong, is it in encoding etc..

  VerifyPasswordHash(request.Password, user.PasswordHash, user.PasswordSalt)
  

  learning the code from the tutorial but tutorial is from DB extraction, so want to know if I am doing anything wrong in the process for it to not match.