The ChaCha20-Poly1305 AEAD Cipher for Transport Layer Security
draft-ietf-tls-chacha20-poly1305-00

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Document Type Active Internet-Draft (tls WG)
Last updated 2015-10-05 (latest revision 2015-06-11)
Replaces draft-mavrogiannopoulos-chacha-tls
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Network Working Group                                         A. Langley
Internet-Draft                                                  W. Chang
Updates: 5246, 6347 (if approved)                             Google Inc
Intended status: Standards Track                    N. Mavrogiannopoulos
Expires: December 13, 2015                                       Red Hat
                                                         J. Strombergson
                                                      Secworks Sweden AB
                                                            S. Josefsson
                                                                  SJD AB
                                                           June 11, 2015

     The ChaCha20-Poly1305 AEAD Cipher for Transport Layer Security
                  draft-ietf-tls-chacha20-poly1305-00

Abstract

   This document describes the use of the ChaCha stream cipher with
   Poly1305 in Transport Layer Security (TLS) and Datagram Transport
   Layer Security (DTLS) protocols.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on December 13, 2015.

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   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   carefully, as they describe your rights and restrictions with respect

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   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The ChaCha Cipher . . . . . . . . . . . . . . . . . . . . . .   3
   3.  The Poly1305 Authenticator  . . . . . . . . . . . . . . . . .   3
   4.  ChaCha20 Cipher Suites  . . . . . . . . . . . . . . . . . . .   3
     4.1.  ChaCha20 Cipher Suites with Poly1305  . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   This document describes the use of the ChaCha stream cipher in the
   Transport Layer Security (TLS) version 1.2 [RFC5246] protocol, as
   well as in the Datagram Transport Layer Security (DTLS) version 1.2
   [RFC6347], or any later versions.

   ChaCha [CHACHA] is a stream cipher that has been designed for high
   performance in software implementations.  The cipher has compact
   implementation and uses few resources and inexpensive operations that
   makes it suitable for implementation on a wide range of
   architectures.  It has been designed to prevent leakage of
   information through side channel analysis, has a simple and fast key
   setup and provides good overall performance.  It is a variant of
   Salsa20 [SALSA20SPEC] which is one of the selected ciphers in the
   eSTREAM portfolio [ESTREAM].

   Recent attacks [CBC-ATTACK] have indicated problems with CBC-mode
   cipher suites in TLS and DTLS as well as issues with the only
   supported stream cipher (RC4) [RC4-ATTACK].  While the existing AEAD
   (AES-GCM) ciphersuites address some of these issues, concerns about
   the performance and ease of software implementation are sometimes
   raised.

   Therefore, a new stream cipher to replace RC4 and address all the
   previous issues is needed.  It is the purpose of this document to
   describe a secure stream cipher for both TLS and DTLS that is
   comparable to RC4 in speed on a wide range of platforms and can be

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