Merge #498: bitbox02: implement sign_message()

a30d672 bitbox02: update to v5.3.0 (Marko Bencun)
43c60c5 bitbox02: implement sign_message() (Marko Bencun)

Pull request description:

ACKs for top commit:
  achow101:
    ACK a30d672

Tree-SHA512: dcca832716725ad996968a66a1857d0d2654b91af609aa492798562fd06a9910fdd094c40ae0285f7f08fed97e67e9e91c5bf49cf5abd32932445bfe4a968771

hwilib/_gui.py

@@ -363,7 +363,7 @@ def get_client_and_device_info(self, index):
             self.client.set_noise_config(BitBox02NoiseConfig())
 
         self.ui.setpass_button.setEnabled(self.device_info['type'] != 'bitbox02')
-        self.ui.signmsg_button.setEnabled(self.device_info['type'] != 'bitbox02')
+        self.ui.signmsg_button.setEnabled(True)
         self.ui.toggle_passphrase_button.setEnabled(self.device_info['type'] in ('trezor', 'keepkey', 'bitbox02', ))
 
         self.get_device_info()

hwilib/devices/bitbox02.py

@@ -16,6 +16,7 @@
     Sequence,
     TypeVar,
 )
+import base64
 import builtins
 import sys
 from functools import wraps
@@ -782,10 +783,32 @@ def script_config_from_utxo(
 
         return psbt
 
+    @bitbox02_exception
     def sign_message(
         self, message: Union[str, bytes], bip32_path: str
     ) -> str:
-        raise UnavailableActionError("The BitBox02 does not support 'signmessage'")
+        if isinstance(message, str):
+            message = message.encode("utf-8")
+        keypath = parse_path(bip32_path)
+        purpose = keypath[0]
+        simple_type = {
+            PURPOSE_P2WPKH: bitbox02.btc.BTCScriptConfig.P2WPKH,
+            PURPOSE_P2WPKH_P2SH: bitbox02.btc.BTCScriptConfig.P2WPKH_P2SH,
+        }.get(purpose)
+        if simple_type is None:
+            raise BitBox02Error(
+                "For message signing, the keypath bip44 purpose must be 84' or 49'"
+            )
+        _, _, sig65 = self.init().btc_sign_msg(
+            self._get_coin(),
+            bitbox02.btc.BTCScriptConfigWithKeypath(
+                script_config=bitbox02.btc.BTCScriptConfig(
+                    simple_type=simple_type,
+                ),
+                keypath=keypath,
+            ),
+            message)
+        return base64.b64encode(sig65).decode("ascii")
 
     @bitbox02_exception
     def toggle_passphrase(self) -> bool:

pyproject.toml

@@ -24,7 +24,7 @@ mnemonic = "~0"
 typing-extensions = "^3.7"
 libusb1 = "^1.7"
 pyside2 = { version = "^5.14.0", optional = true }
-bitbox02 = ">=5.2.0,<6.0.0"
+bitbox02 = ">=5.3.0,<6.0.0"
 
 [tool.poetry.extras]
 qt = ["pyside2"]

setup.py

@@ -17,7 +17,7 @@
 modules = \
 ['hwi', 'hwi-qt']
 install_requires = \
-['bitbox02>=5.2.0,<6.0.0',
+['bitbox02>=5.3.0,<6.0.0',
  'ecdsa>=0,<1',
  'hidapi>=0,<1',
  'libusb1>=1.7,<2.0',