From d47f6a4e5992e5e59935c9c209ee85d2c93618f3 Mon Sep 17 00:00:00 2001
From: jsing <jsing@openbsd.org>
Date: Sat, 22 Jun 2024 15:25:06 +0000
Subject: [PATCH] Provide CBB_add_u32_length_prefixed().

This is needed for an upcoming change in libcrypto.

ok tb@
---
 lib/libssl/bs_cbb.c     | 8 +++++++-
 lib/libssl/bytestring.h | 9 ++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/lib/libssl/bs_cbb.c b/lib/libssl/bs_cbb.c
index 059f9abd068..9d7ad7d46d8 100644
--- a/lib/libssl/bs_cbb.c
+++ b/lib/libssl/bs_cbb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bs_cbb.c,v 1.29 2024/05/25 15:14:26 tb Exp $	*/
+/*	$OpenBSD: bs_cbb.c,v 1.30 2024/06/22 15:25:06 jsing Exp $	*/
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -328,6 +328,12 @@ CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents)
 	return cbb_add_length_prefixed(cbb, out_contents, 3);
 }
 
+int
+CBB_add_u32_length_prefixed(CBB *cbb, CBB *out_contents)
+{
+	return cbb_add_length_prefixed(cbb, out_contents, 4);
+}
+
 int
 CBB_add_asn1(CBB *cbb, CBB *out_contents, unsigned int tag)
 {
diff --git a/lib/libssl/bytestring.h b/lib/libssl/bytestring.h
index 51284da8dbe..750343d4fa0 100644
--- a/lib/libssl/bytestring.h
+++ b/lib/libssl/bytestring.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bytestring.h,v 1.24 2022/11/09 23:14:51 jsing Exp $	*/
+/*	$OpenBSD: bytestring.h,v 1.25 2024/06/22 15:25:06 jsing Exp $	*/
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -459,6 +459,13 @@ int CBB_add_u16_length_prefixed(CBB *cbb, CBB *out_contents);
  */
 int CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents);
 
+/*
+ * CBB_add_u32_length_prefixed sets |*out_contents| to a new child of |cbb|.
+ * The data written to |*out_contents| will be prefixed in |cbb| with a 32-bit,
+ * big-endian length. It returns one on success or zero on error.
+ */
+int CBB_add_u32_length_prefixed(CBB *cbb, CBB *out_contents);
+
 /*
  * CBB_add_asn sets |*out_contents| to a |CBB| into which the contents of an
  * ASN.1 object can be written. The |tag| argument will be used as the tag for
-- 
2.20.1