OpenSSL::X509::StoreContext.new

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

    rb_scan_args(argc, argv, "12", &store, &cert, &chain);
    GetX509StCtx(self, ctx);
    GetX509Store(store, x509st);
    if (!NIL_P(cert))
        x509 = DupX509CertPtr(cert); /* NEED TO DUP */
    if (!NIL_P(chain)) {
        x509s = ossl_protect_x509_ary2sk(chain, &state);
        if (state) {
            X509_free(x509);
            rb_jump_tag(state);
        }
    }
    if (X509_STORE_CTX_init(ctx, x509st, x509, x509s) != 1){
        X509_free(x509);
        sk_X509_pop_free(x509s, X509_free);
        ossl_raise(eX509StoreError, "X509_STORE_CTX_init");
    }
    rb_iv_set(self, "@verify_callback", rb_iv_get(store, "@verify_callback"));
    rb_iv_set(self, "@cert", cert);

    return self;
}