BN_ZERO - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBN_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.
BUGSIf 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)
HISTORYIn OpenSSL 0.9.8, BN_zero() was changed to not return a value; previous versions returned an int.
COPYRIGHTCopyright 2000−2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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>. 0
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