Re: [Curdle] I-D Action: draft-ietf-curdle-cms-eddsa-signatures-05.txt

Russ Housley <housley@vigilsec.com> Tue, 11 April 2017 21:40 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Tue, 11 Apr 2017 17:40:03 -0400
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Subject: Re: [Curdle] I-D Action: draft-ietf-curdle-cms-eddsa-signatures-05.txt
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I believe that this resolves the issues that were raised by Jim Schaad yesterday.

When Ed448 is used, the SHAKE256 output remains a 512 bits based on the information provided by Ilari Liusvaara.

Russ


> On Apr 11, 2017, at 5:36 PM, internet-drafts@ietf.org wrote:
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the CURves, Deprecating and a Little more Encryption of the IETF.
> 
>        Title           : Use of EdDSA Signatures in the Cryptographic Message Syntax (CMS)
>        Author          : Russ Housley
> 	Filename        : draft-ietf-curdle-cms-eddsa-signatures-05.txt
> 	Pages           : 8
> 	Date            : 2017-04-11
> 
> Abstract:
>   This document specifies the conventions for using Edwards-curve
>   Digital Signature Algorithm (EdDSA) for Curve25519 and Curve448 in
>   the Cryptographic Message Syntax (CMS).  For each curve, EdDSA
>   defines the PureEdDSA and HashEdDSA modes.  However, the HashEdDSA
>   mode is not used with the CMS.  In addition, no context string is
>   used with the CMS.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-curdle-cms-eddsa-signatures/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-curdle-cms-eddsa-signatures-05
> https://datatracker.ietf.org/doc/html/draft-ietf-curdle-cms-eddsa-signatures-05
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-curdle-cms-eddsa-signatures-05
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>