From 1dc5e4cee52ec053e6c60a5727f2b9fa85dc0910 Mon Sep 17 00:00:00 2001
From: Jacob Barthelmeh <jacob@wolfssl.com>
Date: Mon, 16 May 2022 15:26:29 -0600
Subject: [PATCH] add padding for variable ecc signature size

---
 wolfcrypt/src/pkcs7.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wolfcrypt/src/pkcs7.c b/wolfcrypt/src/pkcs7.c
index a4dba75c6..f5e8c751b 100644
--- a/wolfcrypt/src/pkcs7.c
+++ b/wolfcrypt/src/pkcs7.c
@@ -2624,6 +2624,9 @@ static int PKCS7_EncodeSigned(PKCS7* pkcs7, ESD* esd,
 
     if (totalSz > *outputSz) {
         if (*outputSz == 0) {
+            if (pkcs7->publicKeyOID == ECDSAk) {
+                totalSz += ECC_MAX_PAD_SZ; /* signatures size can vary */
+            }
             *outputSz = totalSz;
             idx = totalSz;
             goto out;