From 51c9448aa19840569710971306a055783cad6cc9 Mon Sep 17 00:00:00 2001
From: Juliusz Sosinowicz <juliusz@wolfssl.com>
Date: Thu, 26 Jun 2025 20:08:13 +0200
Subject: [PATCH] Detect correct `MAX_ENCODED_SIG_SZ` based on max support in
 math lib

---
 wolfssl/wolfcrypt/types.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/wolfssl/wolfcrypt/types.h b/wolfssl/wolfcrypt/types.h
index 331cc3368..2c2254c65 100644
--- a/wolfssl/wolfcrypt/types.h
+++ b/wolfssl/wolfcrypt/types.h
@@ -2035,7 +2035,12 @@ enum Max_ASN {
 #elif defined(HAVE_FALCON) || defined(HAVE_DILITHIUM)
     MAX_ENCODED_SIG_SZ  = 5120,
 #elif !defined(NO_RSA)
-#ifdef WOLFSSL_HAPROXY
+#if defined(USE_FAST_MATH) && defined(FP_MAX_BITS)
+    MAX_ENCODED_SIG_SZ  = FP_MAX_BITS / 8,
+#elif (defined(WOLFSSL_SP_MATH_ALL) || defined(WOLFSSL_SP_MATH)) && \
+    defined(SP_INT_BITS)
+    MAX_ENCODED_SIG_SZ  = (SP_INT_BITS + 7) / 8,
+#elif defined(WOLFSSL_HAPROXY)
     MAX_ENCODED_SIG_SZ  = 1024,    /* Supports 8192 bit keys */
 #else
     MAX_ENCODED_SIG_SZ  = 512,     /* Supports 4096 bit keys */