BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
operations
#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);
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.
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.
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.
BN_bn2bin(3)
In OpenSSL 0.9.8,
BN_zero() was changed to not return a value; previous
versions returned an int.
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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>.