1 files changed, 62 insertions, 8 deletions

diff --git a/src/lib/libcrypto/man/BN_bn2bin.3 b/src/lib/libcrypto/man/BN_bn2bin.3
index bf1c19ffd4..082ae6ee53 100644
--- a/src/lib/libcrypto/man/BN_bn2bin.3
+++ b/src/lib/libcrypto/man/BN_bn2bin.3
@@ -1,6 +1,54 @@
-.\"     $OpenBSD: BN_bn2bin.3,v 1.3 2016/11/08 22:19:45 jmc Exp $
+.\"     $OpenBSD: BN_bn2bin.3,v 1.4 2016/11/20 16:30:22 schwarze Exp $
+.\"     OpenSSL a528d4f0 Oct 27 13:40:11 2015 -0400
 .\"
-.Dd $Mdocdate: November 8 2016 $
+.\" This file was written by Ulf Moeller <ulf@openssl.org>.
+.\" Copyright (c) 2000, 2002, 2016 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: November 20 2016 $
 .Dt BN_BN2BIN 3
 .Os
 .Sh NAME
@@ -106,11 +154,15 @@ The string must be freed later using
 .Xr free 3 .
 .Pp
 .Fn BN_hex2bn
-converts the string
+interprets
 .Fa str
-containing a hexadecimal number to a
+as a hexadecimal number.
+The string may start with a minus sign
+.Pq Sq - .
+Conversion stops at the first byte that is not a hexadecimal digit.
+The number is converted to a
 .Vt BIGNUM
-and stores it in
+and stored in
 .Pf * Fa a .
 If
 .Pf * Fa a
@@ -124,7 +176,7 @@ If
 is
 .Dv NULL ,
 it only computes the number's length in hexadecimal digits.
-If the string starts with a minus sign, the number is negative.
+A "negative zero" is converted to zero.
 .Fn BN_dec2bn
 is the same using the decimal system.
 .Pp
@@ -196,8 +248,10 @@ on error.
 .Fn BN_hex2bn
 and
 .Fn BN_dec2bn
-return the number's length in hexadecimal or decimal digits, and 0 on
-error.
+return the number's length in hexadecimal or decimal digits
+or 0 on error, in which case no new
+.Vt BIGNUM
+will be created.
 .Pp
 .Fn BN_print_fp
 and