BN_zero(3)                          OpenSSL                         BN_zero(3)



NNAAMMEE
       BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM
       assignment operations

SSYYNNOOPPSSIISS
        #include <openssl/bn.h>

        int BN_zero(BIGNUM *a);
        int BN_one(BIGNUM *a);

        const BIGNUM *BN_value_one(void);

        int BN_set_word(BIGNUM *a, unsigned long w);
        unsigned long BN_get_word(BIGNUM *a);

DDEESSCCRRIIPPTTIIOONN
       _B_N___z_e_r_o_(_), _B_N___o_n_e_(_) and _B_N___s_e_t___w_o_r_d_(_) set aa to the values 0, 1 and ww
       respectively.  _B_N___z_e_r_o_(_) and _B_N___o_n_e_(_) are macros.

       _B_N___v_a_l_u_e___o_n_e_(_) returns a BBIIGGNNUUMM constant of value 1. This constant is
       useful for use in comparisons and assignment.

       _B_N___g_e_t___w_o_r_d_(_) returns aa, if it can be represented as an unsigned long.

RREETTUURRNN VVAALLUUEESS
       _B_N___g_e_t___w_o_r_d_(_) returns the value aa, and 0xffffffffL if aa cannot be rep-
       resented as an unsigned long.

       _B_N___z_e_r_o_(_), _B_N___o_n_e_(_) and _B_N___s_e_t___w_o_r_d_(_) return 1 on success, 0 otherwise.
       _B_N___v_a_l_u_e___o_n_e_(_) returns the constant.

BBUUGGSS
       Someone might change the constant.

       If a BBIIGGNNUUMM is equal to 0xffffffffL it can be represented as an
       unsigned long but this value is also returned on error.

SSEEEE AALLSSOO
       _b_n(3), _B_N___b_n_2_b_i_n(3)

HHIISSTTOORRYY
       _B_N___z_e_r_o_(_), _B_N___o_n_e_(_) and _B_N___s_e_t___w_o_r_d_(_) are available in all versions of
       SSLeay and OpenSSL. _B_N___v_a_l_u_e___o_n_e_(_) and _B_N___g_e_t___w_o_r_d_(_) were added in
       SSLeay 0.8.

       _B_N___v_a_l_u_e___o_n_e_(_) was changed to return a true const BIGNUM * in OpenSSL
       0.9.7.



1.0.1u                            2016-09-22                        BN_zero(3)