BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic
functions on BIGNUMs with integers
#include <openssl/bn.h>
int BN_add_word(BIGNUM *a, BN_ULONG w);
int BN_sub_word(BIGNUM *a, BN_ULONG w);
int BN_mul_word(BIGNUM *a, BN_ULONG w);
BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
These functions perform arithmetic operations on BIGNUMs with unsigned integers.
They are much more efficient than the normal BIGNUM arithmetic operations.
BN_add_word() adds
w to
a ("a+=w").
BN_sub_word() subtracts
w from
a ("a-=w").
BN_mul_word() multiplies
a and
w ("a*=w").
BN_div_word() divides
a by
w ("a/=w") and returns
the remainder.
BN_mod_word() returns the remainder of
a divided by
w
("a%w").
For
BN_div_word() and
BN_mod_word(),
w must not be 0.
BN_add_word(),
BN_sub_word() and
BN_mul_word() return 1 for
success, 0 on error. The error codes can be obtained by
ERR_get_error(3).
BN_mod_word() and
BN_div_word() return
a%
w on
success and
(BN_ULONG)-1 if an error occurred.
ERR_get_error(3),
BN_add(3)
Copyright 2000-2017 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>.