OpenSSL::X509::Certificate#extensions=

static VALUE
ossl_x509_set_extensions(VALUE self, VALUE ary)
{
    X509 *x509;
    X509_EXTENSION *ext;
    long i;

    Check_Type(ary, T_ARRAY);
    /* All ary's members should be X509Extension */
    for (i=0; i<RARRAY_LEN(ary); i++) {
        OSSL_Check_Kind(RARRAY_AREF(ary, i), cX509Ext);
    }
    GetX509(self, x509);
    for (i = X509_get_ext_count(x509); i > 0; i--)
        X509_EXTENSION_free(X509_delete_ext(x509, 0));
    for (i=0; i<RARRAY_LEN(ary); i++) {
        ext = GetX509ExtPtr(RARRAY_AREF(ary, i));
        if (!X509_add_ext(x509, ext, -1)) { /* DUPs ext */
            ossl_raise(eX509CertError, "X509_add_ext");
        }
    }

    return ary;
}