SFT-4203: fixed casa signatures

ports/stm32/boards/Passport/modules/flows/sign_electrum_message_flow.py

@@ -82,7 +82,7 @@ async def show_message(self):
 
     async def do_sign(self):
         (sig, address, error) = await spinner_task('Signing Message', sign_text_file_task,
-                                                   args=[self.message, self.subpath, self.addr_format, True])
+                                                   args=[self.message, self.subpath, self.addr_format])
         if error is None:
             self.signature = sig
             self.goto(self.show_signed)

ports/stm32/boards/Passport/modules/tasks/sign_text_file_task.py

@@ -11,20 +11,17 @@
 
 import stash
 import chains
-from utils import sign_message_digest, sign_message_digest_recoverable
+from utils import sign_message_digest_recoverable
 
 
-async def sign_text_file_task(on_done, text, subpath, addr_fmt, recoverable=False):
+async def sign_text_file_task(on_done, text, subpath, addr_fmt):
 
     with stash.SensitiveValues() as sv:
         node = sv.derive_path(subpath)
         address = sv.chain.address(node, addr_fmt)
 
     digest = chains.current_chain().hash_message(text.encode())
-    if recoverable:
-        # signature will be 65 bytes
-        signature = sign_message_digest_recoverable(digest, subpath)
-    else:
-        signature = sign_message_digest(digest, subpath)
+    # signature will be 65 bytes
+    signature = sign_message_digest_recoverable(digest, subpath)
 
     await on_done(signature, address, None)

ports/stm32/boards/Passport/modules/utils.py

@@ -1038,19 +1038,6 @@ def split_to_lines(s, width):
     return '\n'.join([s[i:i + width] for i in range(0, len(s), width)])
 
 
-def sign_message_digest(digest, subpath):
-    from foundation import secp256k1
-    # do the signature itself!
-    with stash.SensitiveValues() as sv:
-        node = sv.derive_path(subpath)
-        pk = node.private_key()
-        sv.register(pk)
-
-        rv = secp256k1.sign_ecdsa(digest, pk)
-
-    return rv
-
-
 def sign_message_digest_recoverable(digest, subpath):
     from trezorcrypto import ecdsa
     # do the signature itself!