HP OpenVMS Systems Documentation

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HP Open Source Security for OpenVMS Volume 2: HP SSL for OpenVMS > CRYPTO Application Programming Interface (API) Reference

BN_add_word

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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_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.