- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- SEE ALSO
- COPYRIGHT

# NAME

BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic functions on BIGNUMs with integers

# SYNOPSIS

     #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);

# DESCRIPTION

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.

# RETURN VALUES

`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.

# SEE ALSO

ERR_get_error(3), BN_add(3)

# COPYRIGHT

Copyright 2000-2017 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.