[#3] Added generate proto script create container method

Signed-off-by: Ilyas Niyazov <i.niyazov@yadro.com>

frostfs_sdk/cryptography/signer.py

@@ -1,8 +1,20 @@
 import ecdsa
 from hashlib import sha256, sha512
 
+from google.protobuf.message import Message
+
+from frostfs_sdk.client.models.ecdsa_model import ECDSA
+from frostfs_sdk.protos.models.refs.types_pb2 import SignatureRFC6979, Signature
+
 
 class Signer:
+    @staticmethod
+    def sign_message_rfc_6979(key: ECDSA, message: Message) -> SignatureRFC6979:
+        return SignatureRFC6979(
+            key=key.public_key,
+            sign=Signer.sign_rfc6979(key.private_key, message.SerializeToString())
+        )
+
     @staticmethod
     def sign_rfc6979(private_key: bytes, message: bytes) -> bytes:
         if len(private_key) == 0 or private_key is None:
@@ -14,6 +26,13 @@ class Signer:
 
         return signature
 
+    @staticmethod
+    def sign_message(key: ECDSA, message: Message) -> SignatureRFC6979:
+        return SignatureRFC6979(
+            key=key.public_key,
+            sign=Signer.sign(key.private_key, message.SerializeToString())
+        )
+
     @staticmethod
     def sign(private_key: bytes, message: bytes) -> bytes:
         if len(private_key) == 0 or private_key is None:
@@ -26,3 +45,10 @@ class Signer:
         signature_with_marker = bytes([0x04]) + signature
 
         return signature_with_marker
+
+    @staticmethod
+    def _sign_message_part(key: ECDSA, data: Message) -> Signature:
+        return Signature(
+            key=key.public_key,
+            sign=Signature.sign(key.private_key, data.SerializeToString())
+        )