From dd2388e40d48ee228dcf64c7254bfca7abb6bcd0 Mon Sep 17 00:00:00 2001
From: MX <10697207+xMasterX@users.noreply.github.com>
Date: Mon, 24 Feb 2025 10:57:27 +0300
Subject: [PATCH] discard wrong hollarms if bytesum is invalid

---
 lib/subghz/protocols/hollarm.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/subghz/protocols/hollarm.c b/lib/subghz/protocols/hollarm.c
index ab2ce342f..fc76affa0 100644
--- a/lib/subghz/protocols/hollarm.c
+++ b/lib/subghz/protocols/hollarm.c
@@ -376,6 +376,21 @@ void subghz_protocol_decoder_hollarm_feed(void* context, bool level, volatile ui
                     // Saving with 2bit to the right offset for proper parsing
                     instance->generic.data = (instance->decoder.decode_data >> 2);
                     instance->generic.data_count_bit = instance->decoder.decode_count_bit;
+
+                    uint8_t bytesum = ((instance->generic.data >> 32) & 0xFF) +
+                                      ((instance->generic.data >> 24) & 0xFF) +
+                                      ((instance->generic.data >> 16) & 0xFF) +
+                                      ((instance->generic.data >> 8) & 0xFF);
+
+                    if(bytesum != (instance->generic.data & 0xFF)) {
+                        // Check if the key is valid by verifying the sum
+                        instance->generic.data = 0;
+                        instance->generic.data_count_bit = 0;
+                        instance->decoder.decode_data = 0;
+                        instance->decoder.decode_count_bit = 0;
+                        instance->decoder.parser_step = HollarmDecoderStepReset;
+                        break;
+                    }
                     if(instance->base.callback)
                         instance->base.callback(&instance->base, instance->base.context);
                 }