From 9a4a8a10f2d6b31c59a35b8e9507c38918b06ae9 Mon Sep 17 00:00:00 2001
From: Gunnar Skjold <gunnar.skjold@gmail.com>
Date: Sun, 14 Jul 2024 21:31:17 +0200
Subject: [PATCH] Corrected RSA block size

---
 lib/CloudConnector/src/CloudConnector.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/CloudConnector/src/CloudConnector.cpp b/lib/CloudConnector/src/CloudConnector.cpp
index 19e897d2..7c0ead9f 100644
--- a/lib/CloudConnector/src/CloudConnector.cpp
+++ b/lib/CloudConnector/src/CloudConnector.cpp
@@ -419,7 +419,7 @@ void CloudConnector::update(AmsData& data, EnergyAccounting& ea) {
     }
     memset(encryptedBuffer, 0, rsa->len);
 
-    int maxlen = rsa->len - 42;
+    int maxlen = rsa->len - 11; // 11 should be the correct padding size for PKCS1
     udp.beginPacket(config.hostname,7443);
     for(int i = 0; i < pos; i += maxlen) {
         int ret = mbedtls_rsa_pkcs1_encrypt(rsa, mbedtls_ctr_drbg_random, &ctr_drbg, MBEDTLS_RSA_PUBLIC, maxlen, (unsigned char*) (clearBuffer+i), encryptedBuffer);