fix incompatible type

Author: aliel

src/aleph/sdk/chains/cosmos.py

@@ -54,7 +54,8 @@ def __init__(self, private_key=None, hrp=DEFAULT_HRP):
     async def sign_message(self, message):
         message = self._setup_sender(message)
         verif = get_verification_string(message)
-        base64_pubkey = base64.b64encode(self.get_public_key()).decode("utf-8")
+        pub_key = bytes.fromhex(self.get_public_key())
+        base64_pubkey = base64.b64encode(pub_key).decode()
         signature = await self.sign_raw(verif.encode("utf-8"))
 
         sig = {
@@ -80,7 +81,7 @@ def get_address(self) -> str:
         return privkey_to_address(self.private_key)
 
     def get_public_key(self) -> str:
-        return privkey_to_pubkey(self.private_key)
+        return privkey_to_pubkey(self.private_key).hex()
 
 
 def get_fallback_account(path: Optional[Path] = None, hrp=DEFAULT_HRP):

tests/unit/test_chain_cosmos.py

@@ -27,6 +27,7 @@ async def test_verify_signature(cosmos_account):
             "SomeHash",
         )
     )
+
     await cosmos_account.sign_message(message)
     assert message["signature"]
     signature = json.loads(message["signature"])
@@ -57,7 +58,7 @@ async def test_verify_signature_raw(cosmos_account):
     raw_signature = await cosmos_account.sign_raw(raw_message)
     assert isinstance(raw_signature, bytes)
 
-    pub_key = cosmos_account.get_public_key()
+    pub_key = bytes.fromhex(cosmos_account.get_public_key())
     verify_signature(
         raw_signature.decode(),
         pub_key,