               <select class="form-control" v-model="convert_from.type">
                        <option :value="0">从私钥导出公钥</option>
                        <option :value="1">从公钥证书导出公钥</option>
                        <option :value="2">从CSR导出公钥</option>
                    </select>
                </div>
                <div class="d-flex flex-wrap">
                    <div class="form-group flex-fill mr-2">
                        <label class="form-lab