Added create container grpc method

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

frostfs_sdk/cryptography/signer.py

@@ -0,0 +1,28 @@
+import ecdsa
+from hashlib import sha256, sha512
+
+
+class Signer:
+    @staticmethod
+    def sign_rfc6979(private_key: bytes, message: bytes) -> bytes:
+        if len(private_key) == 0 or private_key is None:
+            raise ValueError(f"Incorrect private_key: {private_key}")
+
+        sk = ecdsa.SigningKey.from_string(private_key, curve=ecdsa.NIST256p, hashfunc=sha256)
+
+        signature = sk.sign_deterministic(message)
+
+        return signature
+
+    @staticmethod
+    def sign(private_key: bytes, message: bytes) -> bytes:
+        if len(private_key) == 0 or private_key is None:
+            raise ValueError(f"Incorrect private key: {private_key}")
+
+        sk = ecdsa.SigningKey.from_string(private_key, curve=ecdsa.NIST256p, hashfunc=sha512)
+        signature = sk.sign(message)
+
+        # the first byte indicates the node version marker
+        signature_with_marker = bytes([0x04]) + signature
+
+        return signature_with_marker