wip: shamir secret sharing

messages/hww.proto

@@ -25,6 +25,7 @@ import "eth.proto";
 import "keystore.proto";
 import "mnemonic.proto";
 import "system.proto";
+import "shamir.proto";
 
 import "perform_attestation.proto";
 
@@ -67,6 +68,9 @@ message Request {
         ElectrumEncryptionKeyRequest electrum_encryption_key = 26;
         CardanoRequest cardano = 27;
         BIP85Request bip85 = 28;
+        ShowShamirRequest show_shamir = 29;
+        RestoreFromShamirRequest restore_from_shamir = 30;
+
     }
 }
 

messages/shamir.proto

@@ -0,0 +1,23 @@
+// Copyright 2019 Shift Cryptosecurity AG
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+package shiftcrypto.bitbox02;
+
+message ShowShamirRequest {
+}
+message RestoreFromShamirRequest {
+  uint32 timestamp = 1;
+  int32 timezone_offset = 2;
+}

py/bitbox02/Makefile

@@ -15,7 +15,7 @@
 
 OUT_DIR=bitbox02/communication/generated
 
-PROTO_FILES=hww.proto common.proto backup_commands.proto bitbox02_system.proto btc.proto cardano.proto eth.proto mnemonic.proto system.proto perform_attestation.proto keystore.proto antiklepto.proto
+PROTO_FILES=hww.proto common.proto backup_commands.proto bitbox02_system.proto btc.proto cardano.proto eth.proto mnemonic.proto system.proto perform_attestation.proto keystore.proto antiklepto.proto shamir.proto
 
 TARGETS=$(addprefix ${OUT_DIR}/, $(PROTO_FILES:.proto=_pb2.py))
 

py/bitbox02/bitbox02/bitbox02/bitbox02.py

@@ -38,6 +38,7 @@
     from bitbox02.communication.generated import btc_pb2 as btc
     from bitbox02.communication.generated import cardano_pb2 as cardano
     from bitbox02.communication.generated import mnemonic_pb2 as mnemonic
+    from bitbox02.communication.generated import shamir_pb2 as shamir
     from bitbox02.communication.generated import bitbox02_system_pb2 as bitbox02_system
     from bitbox02.communication.generated import backup_commands_pb2 as backup
     from bitbox02.communication.generated import common_pb2 as common
@@ -259,6 +260,17 @@ def show_mnemonic(self) -> None:
         request.show_mnemonic.CopyFrom(mnemonic.ShowMnemonicRequest())
         self._msg_query(request, expected_response="success")
 
+    def show_shamir(self) -> None:
+        """
+        Returns True if shamir mnemonics were successfully shown and confirmed.
+        Raises a Bitbox02Exception on failure.
+        """
+        # self._require_atleast(semver.VersionInfo(9, 16, 0)) TODO
+        # pylint: disable=no-member
+        request = hww.Request()
+        request.show_shamir.CopyFrom(shamir.ShowShamirRequest())
+        self._msg_query(request, expected_response="success")
+
     def _btc_msg_query(
         self, btc_request: btc.BTCRequest, expected_response: Optional[str] = None
     ) -> btc.BTCResponse:
@@ -1136,6 +1148,19 @@ def restore_from_mnemonic(self) -> None:
         )
         self._msg_query(request)
 
+    def restore_from_shamir(self) -> None:
+        """
+        Restore from shamir backup. Raises a Bitbox02Exception on failure.
+        """
+        request = hww.Request()
+        # pylint: disable=no-member
+        request.restore_from_shamir.CopyFrom(
+            shamir.RestoreFromShamirRequest(
+                timestamp=int(time.time()), timezone_offset=time.localtime().tm_gmtoff
+            )
+        )
+        self._msg_query(request)
+
     def _cardano_msg_query(
         self, cardano_request: cardano.CardanoRequest, expected_response: Optional[str] = None
     ) -> cardano.CardanoResponse: