From 76806942103810c65379e71cf627f5490fe4674b Mon Sep 17 00:00:00 2001
From: tb <>
Date: Wed, 15 Mar 2023 06:34:07 +0000
Subject: Return the signature length after successful signing operation

This is required behavior of the EVP_DigestSign() API, but seemingly
almost nothing uses this. Well, turns out ldns does.

Reported by Stephane. Helpful comments by sthen.

ok jsing
---
 src/lib/libcrypto/ec/ecx_methods.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/lib/libcrypto/ec/ecx_methods.c b/src/lib/libcrypto/ec/ecx_methods.c
index 26fef18381..8510d1a471 100644
--- a/src/lib/libcrypto/ec/ecx_methods.c
+++ b/src/lib/libcrypto/ec/ecx_methods.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ecx_methods.c,v 1.4 2022/11/26 16:08:52 tb Exp $ */
+/*	$OpenBSD: ecx_methods.c,v 1.5 2023/03/15 06:34:07 tb Exp $ */
 /*
  * Copyright (c) 2022 Joel Sing <jsing@openbsd.org>
  *
@@ -741,6 +741,8 @@ pkey_ecx_digestsign(EVP_MD_CTX *md_ctx, unsigned char *out_sig,
 	    ecx_key->priv_key))
 		return 0;
 
+	*out_sig_len = ecx_sig_size(pkey_ctx->pkey);
+
 	return 1;
 }
 
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