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.