initial services

NF/MSL/schemes/EntityAuthentication.py

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+from .. import EntityAuthenticationSchemes
+from ..MSLObject import MSLObject
+
+
+# noinspection PyPep8Naming
+class EntityAuthentication(MSLObject):
+    def __init__(self, scheme, authdata):
+        """
+        Data used to identify and authenticate the entity associated with a message.
+        https://github.com/Netflix/msl/wiki/Entity-Authentication-%28Configuration%29
+
+        :param scheme: Entity Authentication Scheme identifier
+        :param authdata: Entity Authentication data
+        """
+        self.scheme = str(scheme)
+        self.authdata = authdata
+
+    @classmethod
+    def Unauthenticated(cls, identity):
+        """
+        The unauthenticated entity authentication scheme does not provide encryption or authentication and only
+        identifies the entity. Therefore entity identities can be harvested and spoofed. The benefit of this
+        authentication scheme is that the entity has control over its identity. This may be useful if the identity is
+        derived from or related to other data, or if retaining the identity is desired across state resets or in the
+        event of MSL errors requiring entity re-authentication.
+        """
+        return cls(
+            scheme=EntityAuthenticationSchemes.Unauthenticated,
+            authdata={"identity": identity}
+        )
+
+    @classmethod
+    def Widevine(cls, devtype, keyrequest):
+        """
+        The Widevine entity authentication scheme is used by devices with the Widevine CDM. It does not provide
+        encryption or authentication and only identifies the entity. Therefore entity identities can be harvested
+        and spoofed. The entity identity is composed from the provided device type and Widevine key request data. The
+        Widevine CDM properties can be extracted from the key request data.
+
+        When coupled with the Widevine key exchange scheme, the entity identity can be cryptographically validated by
+        comparing the entity authentication key request data against the key exchange key request data.
+
+        Note that the local entity will not know its entity identity when using this scheme.
+
+        > Devtype
+
+        An arbitrary value identifying the device type the local entity wishes to assume. The data inside the Widevine
+        key request may be optionally used to validate the claimed device type.
+
+        :param devtype: Local entity device type
+        :param keyrequest: Widevine key request
+        """
+        return cls(
+            scheme=EntityAuthenticationSchemes.Widevine,
+            authdata={
+                "devtype": devtype,
+                "keyrequest": keyrequest
+            }
+        )