BN_ZERO
Section: OpenSSL (3SSL)
Updated: 2024-03-03
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NAME
BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
operations
SYNOPSIS
#include <openssl/bn.h>
void BN_zero(BIGNUM *a);
int BN_one(BIGNUM *a);
const BIGNUM *BN_value_one(void);
int BN_set_word(BIGNUM *a, BN_ULONG w);
unsigned BN_ULONG BN_get_word(BIGNUM *a);
DESCRIPTION
BN_ULONG is a macro that will be an unsigned integral type optimized
for the most efficient implementation on the local platform.
BN_zero(), BN_one() and BN_set_word() set a to the values 0, 1 and
w respectively. BN_zero() and BN_one() are macros.
BN_value_one() returns a BIGNUM constant of value 1. This constant
is useful for use in comparisons and assignment.
BN_get_word() returns a, if it can be represented as a BN_ULONG.
RETURN VALUES
BN_get_word() returns the value a, or all-bits-set if a cannot
be represented as a single integer.
BN_one() and BN_set_word() return 1 on success, 0 otherwise.
BN_value_one() returns the constant.
BN_zero() never fails and returns no value.
BUGS
If a BIGNUM is equal to the value of all-bits-set, it will collide
with the error condition returned by BN_get_word() which uses that
as an error value.
BN_ULONG should probably be a typedef.
SEE ALSO
BN_bn2bin(3)
HISTORY
In OpenSSL 0.9.8, BN_zero() was changed to not return a value; previous
versions returned an int.
COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the ``License''). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- BUGS
-
- SEE ALSO
-
- HISTORY
-
- COPYRIGHT
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