Additional Master Secret Inputs for TLS
RFC 6358
| Document | Type |
RFC - Experimental
(January 2012; No errata)
Was draft-hoffman-tls-master-secret-input (individual in sec area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6358 (Experimental) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Sean Turner | ||
| IESG note | There is no document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) P. Hoffman
Request for Comments: 6358 VPN Consortium
Category: Experimental January 2012
ISSN: 2070-1721
Additional Master Secret Inputs for TLS
Abstract
This document describes a mechanism for using additional master
secret inputs with Transport Layer Security (TLS) and Datagram TLS
(DTLS).
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This document is a product of the Internet Engineering
Task Force (IETF). It represents the consensus of the IETF
community. It has received public review and has been approved for
publication by the Internet Engineering Steering Group (IESG). Not
all documents approved by the IESG are a candidate for any level of
Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6358.
Copyright Notice
Copyright (c) 2012 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
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Hoffman Experimental [Page 1]
RFC 6358 Additional TLS Inputs January 2012
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material may not have granted the IETF Trust the right to allow
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it for publication as an RFC or to translate it into languages other
than English.
1. Introduction
Some TLS 1.2 [RFC5246] and DTLS 1.2 [RFC6347] extensions want to mix
particular data into the calculation of the master secret. This
mixing creates a cryptographic binding of the added material directly
into the secret that is used to protect the TLS session. For
example, some systems want to be sure that there is sufficient
randomness in the TLS master secret, and this can be accomplished by
adding it directly to the master secret calculations.
This document describes a framework for TLS and DTLS extensions to
meet these requirements. In an extension that uses this framework, a
client and server provide data in the handshake using normal TLS
extensions, and then this data is combined with the ClientHello and
ServerHello random values during the derivation of the master_secret.
Extensions that specify data to be added to the master secret are
called "extensions with master secret input". An extension with
master secret input must specify the additional input that comes from
the client and/or the server. Note that the term "and/or" is used
here because the definition of the extension might cause input to the
master secret to come from only one of the participants.
Note that extensions that do not specify that they are extensions
with master secret input cannot be extensions with master secret
input. That is, every extension that does not call itself an
extension with master secret input is treated just like a normal
extension. Also note that this document only describes a framework;
if an extension uses this framework, and a client and server both
implement the extension, no signaling about the use of master secret
input is needed: that comes as part of the extension definition
itself.
Use of one or more of these extensions changes the way that the
master secret is calculated in TLS and DTLS. That is, if the
handshake has no extensions, or only extensions that are not
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