new

static VALUE
ossl_x509stctx_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE store, cert, chain, t;
    X509_STORE_CTX *ctx;
    X509_STORE *x509st;
    X509 *x509 = NULL;
    STACK_OF(X509) *x509s = NULL;

    rb_scan_args(argc, argv, "12", &store, &cert, &chain);
    GetX509StCtx(self, ctx);
    SafeGetX509Store(store, x509st);
    if(!NIL_P(cert)) x509 = DupX509CertPtr(cert); /* NEED TO DUP */
    if(!NIL_P(chain)) x509s = ossl_x509_ary2sk(chain);
    if(X509_STORE_CTX_init(ctx, x509st, x509, x509s) != 1){
        sk_X509_pop_free(x509s, X509_free);
        ossl_raise(eX509StoreError, NULL);
    }
    if (!NIL_P(t = rb_iv_get(store, "@time")))
        ossl_x509stctx_set_time(self, t);
    rb_iv_set(self, "@verify_callback", rb_iv_get(store, "@verify_callback"));
    rb_iv_set(self, "@cert", cert);

    return self;
}