EIP-8: remove size masking again

EIPS/eip-8.md

@@ -38,17 +38,15 @@ should pad `auth-body` with at least 100 bytes of junk data.
 ```text
 auth-vsn         = 4
 auth-size        = size of enc-auth-body, encoded as a big-endian 16-bit integer
-masked-auth-size = xor(auth-size, enc-auth-body[2:])
 auth-body        = rlp.list(sig, initiator-pubk, initiator-nonce, auth-vsn)
 enc-auth-body    = ecies.encrypt(recipient-pubk, auth-body, auth-size)
-auth-packet      = masked-auth-size || enc-auth-body
+auth-packet      = auth-size || enc-auth-body
 
 ack-vsn          = 4
 ack-size         = size of enc-ack-body, encoded as a big-endian 16-bit integer
-masked-ack-size  = xor(ask-size, enc-ack-body[2:])
 ack-body         = rlp.list(recipient-ephemeral-pubk, recipient-nonce, ack-vsn)
 enc-ack-body     = ecies.encrypt(initiator-pubk, ack-body, ack-size)
-ack-packet       = masked-ack-size || enc-ack-body
+ack-packet       = ack-size || enc-ack-body
 
 where