Update protocol.py

Author: BryceWDesign

src/cyphersyntax/protocol.py

@@ -3,10 +3,17 @@
 
 PROTOCOL_VERSION = 1
 MAX_MESSAGE_SEQUENCE = (1 << 64) - 1
+MAX_PROTOCOL_VERSION = (1 << 16) - 1
+MAX_PARTICIPANT_NAME_BYTES = 255
+MAX_SUITE_NAME_BYTES = 64
+MAX_PLAINTEXT_BYTES = 1_048_576
+AEAD_TAG_BYTES = 16
+MAX_CIPHERTEXT_BYTES = MAX_PLAINTEXT_BYTES + AEAD_TAG_BYTES
+MAX_ENVELOPE_BYTES = (MAX_CIPHERTEXT_BYTES * 2) + 4096
 
 
 def validate_message_sequence(sequence: int) -> None:
-    if isinstance(sequence, bool) or not isinstance(sequence, int):
+    if type(sequence) is not int:
         raise TypeError("message sequence must be an integer")
     if not 0 <= sequence <= MAX_MESSAGE_SEQUENCE:
         raise ValueError("message sequence must fit in an unsigned 64-bit integer")