app.lisk: Add lisk_sign_message

src/apps/lisk/__init__.py

@@ -1,6 +1,6 @@
 from trezor.wire import register, protobuf_workflow
 from trezor.messages.wire_types import \
-    LiskGetAddress, LiskGetPublicKey
+    LiskGetAddress, LiskSignMessage, LiskGetPublicKey
 
 
 def dispatch_LiskGetAddress(*args, **kwargs):
@@ -13,6 +13,12 @@ def dispatch_LiskGetPublicKey(*args, **kwargs):
     return lisk_get_public_key(*args, **kwargs)
 
 
+def dispatch_LiskSignMessage(*args, **kwargs):
+    from .sign_message import lisk_sign_message
+    return lisk_sign_message(*args, **kwargs)
+
+
 def boot():
     register(LiskGetPublicKey, protobuf_workflow, dispatch_LiskGetPublicKey)
     register(LiskGetAddress, protobuf_workflow, dispatch_LiskGetAddress)
+    register(LiskSignMessage, protobuf_workflow, dispatch_LiskSignMessage)

src/apps/lisk/sign_message.py

@@ -0,0 +1,17 @@
+from .helpers import LISK_CURVE, get_address_from_public_key
+
+async def lisk_sign_message(ctx, msg):
+    from trezor.messages.LiskMessageSignature import LiskMessageSignature
+    from trezor.crypto.curve import ed25519
+    from ..common import seed
+
+    address_n = msg.address_n or ()
+    node = await seed.derive_node(ctx, address_n, LISK_CURVE)
+
+    seckey = node.private_key()
+    public_key = ed25519.publickey(seckey)
+    address = get_address_from_public_key(public_key)
+
+    signature = ed25519.sign(seckey, msg.message)
+
+    return LiskMessageSignature(address=address, signature=signature)