SRP_Calc_x_ex
return SRP_Calc_x_ex(s, user, pass, NULL, NULL);
x = SRP_Calc_x_ex(salttmp, user, pass, libctx, propq);
BIGNUM *SRP_Calc_x_ex(const BIGNUM *s, const char *user, const char *pass,
if ((x = SRP_Calc_x_ex(s->srp_ctx.s, s->srp_ctx.login, passwd,