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# 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_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.