From: tb <tb@openbsd.org>
Date: Fri, 7 Jul 2023 06:41:59 +0000 (+0000)
Subject: Insert leading octet if high bit of first nibble is 1
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=ceca8f99aabe920388df5b792cccc8114eb360fb;p=openbsd

Insert leading octet if high bit of first nibble is 1

The reason the function this replaces is called ASN1_bn_print() is that it
actually prints a representation of the ASN.1 encoding.

ok jsing
---

diff --git a/lib/libcrypto/bn/bn_print.c b/lib/libcrypto/bn/bn_print.c
index 466aeb3d646..18984d7d4f1 100644
--- a/lib/libcrypto/bn/bn_print.c
+++ b/lib/libcrypto/bn/bn_print.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bn_print.c,v 1.40 2023/07/06 14:37:39 tb Exp $ */
+/*	$OpenBSD: bn_print.c,v 1.41 2023/07/07 06:41:59 tb Exp $ */
 
 /*
  * Copyright (c) 2023 Theo Buehler <tb@openbsd.org>
@@ -102,6 +102,12 @@ bn_print_bignum(BIO *bio, const BIGNUM *bn, int indent)
 			if (BIO_printf(bio, "\n%*s", indent, "") <= 0)
 				goto err;
 		}
+		/* First nibble has the high bit set. Insert leading 0 octet. */
+		if (octets == 1 && hi >= '8') {
+			if (BIO_printf(bio, "00:") <= 0)
+				goto err;
+			octets++;
+		}
 		if (CBS_len(&cbs) == 0)
 			sep = "";
 		if (BIO_printf(bio, "%c%c%s", tolower(hi), tolower(lo), sep) <= 0)