remove MD5 hashing, send plaintext secret key for bcrypt verification

lib/services/auth_service.dart

@@ -24,20 +24,23 @@ class AuthService {
   Future<void> register(
     String login,
     String password,
-    String secretKeyHash,
+    String secretKey,
   ) async {
+    var data = jsonEncode({
+      'login': login,
+      'password': password,
+      'secret_key': secretKey,
+    });
     final response = await _client.post(
       Uri.parse(ApiConfig.regUrl),
       headers: {'Content-Type': 'application/json'},
-      body: jsonEncode({
-        'login': login,
-        'password': password,
-        'secret_key_hash': secretKeyHash,
-      }),
+      body: data,
     );
 
     if (response.statusCode != 201) {
       throw Exception('Registration failed');
     }
   }
+
+  int rnLength()=>"\r\n".length;
 }