docs: function(keyId) {
      var res = this.get("25519KeysignedKey" + keyId);
      if (res !== undefined) {
        if (!(res.pubKey instanceof ArrayBuffer)) {
          res.pubKey = convertToArrayBuffer(res.pubKey);
        }
        if (!(res.privKey instanceof ArrayBuffer)) {
          res.privKey = convertToArrayBuffer(res.privKey);
        }
        res = { pubKey: res.pubKey, privKey: res.privKey };
      }
      return Promise.resolve(res);
    }