draft-ietf-tls-padding-00.txt   draft-ietf-tls-padding-01.txt 
Network Working Group A. Langley Network Working Group A. Langley
Internet-Draft Google Inc Internet-Draft Google Inc
Expires: July 27, 2015 January 23, 2015 Expires: August 21, 2015 February 17, 2015
A TLS padding extension A TLS ClientHello padding extension
draft-ietf-tls-padding-00 draft-ietf-tls-padding-01
Abstract Abstract
This memo describes the a TLS extension that can be used to pad This memo describes a TLS extension that can be used to pad
ClientHello messages to a desired size. ClientHello messages to a desired size.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on July 27, 2015. This Internet-Draft will expire on August 21, 2015.
Copyright Notice Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
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publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 2, line 47 skipping to change at page 2, line 47
A new extension type ("padding(21)") is defined and MAY be included A new extension type ("padding(21)") is defined and MAY be included
by the client in its ClientHello message. by the client in its ClientHello message.
enum { enum {
padding(21), (65535) padding(21), (65535)
} ExtensionType; } ExtensionType;
The "extension_data" for the extension consists of an arbitary number The "extension_data" for the extension consists of an arbitary number
of zero bytes. For example, the smallest "padding" extension is four of zero bytes. For example, the smallest "padding" extension is four
bytes long and is encoded as 00 15 00 00. A ten byte extension would bytes long and is encoded as 0x00 0x15 0x00 0x00. A ten byte
include 6 bytes of "extension_data" and would be encoded as: extension would include 6 bytes of "extension_data" and would be
encoded as:
00 15 00 06 00 00 00 00 00 00 00 15 00 06 00 00 00 00 00 00
|---| |---| |---------------| |---| |---| |---------------|
| | | | | |
| | \- extension_data: 6 zero bytes | | \- extension_data: 6 zero bytes
| | | |
| \------------- 16-bit, extension_data length | \------------- 16-bit, extension_data length
| |
\------------------- extension_type for padding extension \------------------- extension_type for padding extension
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