From 1afc0df83d0aa2e52656d94c20c772a86a233d50 Mon Sep 17 00:00:00 2001
From: jordan <jordan@wolfssl.com>
Date: Fri, 14 Jul 2023 13:57:29 -0500
Subject: [PATCH] tfm fp_exptmod_nct: set result to zero when base is zero

---
 wolfcrypt/src/tfm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/wolfcrypt/src/tfm.c b/wolfcrypt/src/tfm.c
index 4a4c148c7..618d532e1 100644
--- a/wolfcrypt/src/tfm.c
+++ b/wolfcrypt/src/tfm.c
@@ -3171,8 +3171,10 @@ int fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
    int x = fp_count_bits (X);
 #endif
 
+   /* 0^X mod P = 0 mod P = 0.
+    * Set result to 0 and return early. */
    if (fp_iszero(G)) {
-      fp_set(G, 0);
+      fp_set(Y, 0);
       return FP_OKAY;
    }