Index for Section 3

Alphabetical listing for B

Bottom of page

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.

  The BN_add_word() function adds w to a (a+=w).

  The BN_sub_word() function subtracts w from a (a-=w).

  The BN_mul_word() function multiplies a and w (a*=b).

  The BN_div_word() function divides a by w (a/=w) and returns the remainder.

  The BN_mod_word() function returns the remainder of a divided by w (a%m).

  For the BN_div_word() and BN_mod_word() functions, the value of w must not
  be 0.

RETURN VALUES
  The BN_add_word(), BN_sub_word(), and BN_mul_word() functions return 1 for
  success, 0 on error. The error codes can be obtained by using the
  ERR_get_error() function.

  The BN_mod_word() and BN_div_word() functions return a%w.

HISTORY
  The BN_add_word() and BN_mod_word() functions are available in all versions
  of SSLeay and OpenSSL. The BN_div_word() function was added in SSLeay 0.8,
  and BN_sub_word() and BN_mul_word() in SSLeay 0.9.0.

SEE ALSO
  Functions: bn(3), err(3), BN_add(3)

Index for Section 3

Alphabetical listing for B

Top of page