ERR_LIB_BN
#define ERR_FUNC(func) ERR_PACK(ERR_LIB_BN,func,0)
#define ERR_REASON(reason) ERR_PACK(ERR_LIB_BN,0,reason)
{ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
#define ERR_R_BN_LIB ERR_LIB_BN /* 3 */
#define BNerror(r) ERR_PUT_ERROR(ERR_LIB_BN, (r))
RSAerror(ERR_LIB_BN);
ERR_put_error(ERR_LIB_BN, BN_F_BN_USUB, BN_R_DIV_BY_ZERO,