raw_to_public_key() function added.

Author: smelamud

src/moeralib/crypto/crypto.py

@@ -51,6 +51,18 @@ def raw_public_key(public_key: ec.EllipticCurvePublicKey) -> bytes:
     return numbers.x.to_bytes(32, 'big') + numbers.y.to_bytes(32, 'big')
 
 
+def raw_to_public_key(raw_public_key: bytes) -> ec.EllipticCurvePublicKey:
+    """
+    Restore a public key from the raw format.
+
+    :param raw_public_key: the raw public key
+    :return: the public key
+    """
+    x = int.from_bytes(raw_public_key[:32], 'big')
+    y = int.from_bytes(raw_public_key[32:], 'big')
+    return ec.EllipticCurvePublicNumbers(x, y, ec.SECP256K1()).public_key()
+
+
 def raw_private_key(private_key: ec.EllipticCurvePrivateKey) -> bytes:
     """
     Convert a private key to the raw format to pass to the client.

src/moeralib/node/cartes.py

@@ -29,10 +29,11 @@ def __init__(self, node: MoeraNode, client_scope: List[Scope] | None = None, adm
                  target_node_name: str | None = None):
         """
         :param node: node to get cartes from
-        :param client_scope: permissions to be granted to the carte; if not set, all permissions of the carte's owner
+        :param client_scope: permissions to be granted to the cartes; if not set, all permissions of the cartes' owner
                are granted
-        :param admin_scope: additional administrative permissions (of those granted to the carte's owner by the target
-               node) to be granted to the carte
+        :param admin_scope: additional administrative permissions (of those granted to the cartes' owner by the target
+               node) to be granted to the cartes
+        :param target_node_name: if set, the cartes are valid for authentication on the specified node only
         """
         self._node = node
         self._client_scope = client_scope if client_scope is not None else ["all"]