[LC-382] update coincurve usage in peer service

loopchain/crypto/signature.py

@@ -110,6 +110,9 @@ def __init__(self):
         super().__init__()
         self.private_key: PrivateKey = None
 
+    def get_private_secret(self):
+        return self.private_key.secret
+
     def sign_data(self, data):
         return self.sign(data, False)
 

loopchain/peer/peer_service.py

@@ -123,7 +123,7 @@ def _init_node_key(self):
             password = getpass.getpass(f"Input your keystore password: ")
         signer = Signer.from_prikey_file(prikey_file, password)
         self._make_peer_id(signer.address)
-        self._node_key = signer.private_key.private_key
+        self._node_key = signer.get_private_secret()
 
     def _make_peer_id(self, address):
         self._peer_id = address

testcase/unittest/test_signature.py

@@ -242,10 +242,10 @@ def test_data_signatures_equal(self):
                           self.signer_private_key_pem.sign_data(data))
 
     def test_signer_private_keys_equal(self):
-        self.assertEquals(self.signer_private_key_bytes.private_key.secret,
-                          self.signer_private_key_der.private_key.secret)
-        self.assertEquals(self.signer_private_key_bytes.private_key.secret,
-                          self.signer_private_key_pem.private_key.secret)
+        self.assertEquals(self.signer_private_key_bytes.get_private_secret(),
+                          self.signer_private_key_der.get_private_secret())
+        self.assertEquals(self.signer_private_key_bytes.get_private_secret(),
+                          self.signer_private_key_pem.get_private_secret())
 
     def test_signer_sign_verifier_addresses_equal(self):
         self.assertEquals(self.signer_private_key_bytes.address, self.signer_private_key_der.address)