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*=b).
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%m).
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.
SEE ALSO
bn(3), ERR_get_error(3), BN_add(3)
HISTORY
BN_add_word() and BN_mod_word() are available in all versions
of SSLeay and OpenSSL. BN_div_word() was added in SSLeay 0.8, and
BN_sub_word() and BN_mul_word() in SSLeay 0.9.0.
