NAME    [Toc]    [Back]

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

LIBRARY    [Toc]    [Back]

       libcrypto, -lcrypto

SYNOPSIS    [Toc]    [Back]

        #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    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       openssl_bn(3), openssl_err(3), BN_add(3)

HISTORY    [Toc]    [Back]

       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.



2000-07-22                    0.9.6g               BN_add_word(3)