[API-Student]優化呼叫Hash密碼的方法。

TEAMModelOS/Controllers/School/StudentController.cs

@@ -1787,7 +1787,7 @@ namespace TEAMModelOS.Controllers
                 json.RootElement.TryGetProperty("pw", out JsonElement dbpw);
                 json.RootElement.TryGetProperty("name", out JsonElement name);
 
-                var HashedPW = HashedPassword(pw.ToString(), salt.ToString());
+                var HashedPW = Utils.HashedPassword(pw.ToString(), salt.ToString());
                 if (dbpw.ToString().Equals(HashedPW.ToString()))
                 {
                     //換取AuthToken，提供給前端
@@ -1851,18 +1851,5 @@ namespace TEAMModelOS.Controllers
                 return Ok(new { error, auth_token, blob_uri, blob_sas, classinfo, courses });
             }
         }
-
-        public static string HashedPassword(string password, string salt)
-        {
-            byte[] hashBytes = KeyDerivation.Pbkdf2(
-                password: password,
-                salt: Encoding.UTF8.GetBytes(salt), // SHA1鹽(8-20字節), SHA256(32字節)
-                prf: KeyDerivationPrf.HMACSHA1,
-                iterationCount: 10000, // hash次數,越多次代表破解難度變高,但效能差點
-                numBytesRequested: 256 / 8 // 指定得出結果長度
-            );
-            String hashText = BitConverter.ToString(hashBytes).Replace("-", string.Empty);
-            return hashText;
-        }
     }
 }