diff --git a/onionr/api.py b/onionr/api.py
index 29f8282f..6b45f97e 100755
--- a/onionr/api.py
+++ b/onionr/api.py
@@ -130,7 +130,10 @@ class API:
             elif action == 'getPGP':
                 resp = Response(self._utils.exportMyPubkey())
             elif action == 'setData':
-                pass
+                if data == None:
+                    abort(401)
+                else:
+                    self._core.setData(data)
             elif action == 'getData':
                 resp = Response(self._core.getData(data))
 
@@ -147,6 +150,11 @@ class API:
             self.requestFailed = True
             resp = Response("403")
             return resp
+        @app.errorhandler(401)
+        def clientError(err):
+            self.requestFailed = True
+            resp = Response("Invalid request")
+            return resp
 
         print('Starting client on ' + self.host + ':' + str(bindPort))
         print('Client token:', self.clientToken)
diff --git a/onionr/core.py b/onionr/core.py
index 0c476217..0264c13a 100644
--- a/onionr/core.py
+++ b/onionr/core.py
@@ -17,11 +17,18 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 '''
-import sqlite3, os, time, math, gnupg, base64, tarfile, getpass, simplecrypt
+import sqlite3, os, time, math, gnupg, base64, tarfile, getpass, simplecrypt, hashlib
 from Crypto.Cipher import AES
 from Crypto import Random
 import netcontroller
 
+if sys.version_info < (3, 6):
+    try:
+        import sha3
+    except ModuleNotFoundError:
+        sys.stderr.write('On Python 3 versions prior to 3.6.x, you need the sha3 module')
+        sys.exit(1)
+
 class Core:
     def __init__(self):
         '''
@@ -125,6 +132,10 @@ class Core:
         dataFile.close()
         return data
 
+    def setData(self, data):
+        '''set the data assciated with a hash'''
+        hasher = hashlib.sha3_256
+
     def dataDirEncrypt(self, password):
         '''
         Encrypt the data directory on Onionr shutdown