/xlv3/openssl/0.9.7e-sgipl1/work/0.9.7e-sgipl1/openssl-
0.9.7e/doc/crypto
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BN_add_word(3) 25/Sep/2002 (0.9.7e) BN_add_word(3)
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.
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