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)
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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>.