Hi,
I've just implemented these ciphersuites in BouncyCastle TLS, and have a
couple of questions:
In Section 3., should
TLS_ECDHE_PSK_WITH_AES_256_CCM_8_SHA256 = {0xTBD,0xTBD};
end with ...SHA384 instead?
For the AES-256 cipher suites, the TLS PRF with SHA-384 as the hash
function SHALL be used and Clients and Servers MUST NOT negotiate
curves of less than 384 bits.
requires SHA384 as the PRF, and I don't know what else SHA256 could
refer to for an AEAD ciphersuite.
I'm also curious whether there is a precedent in other RFCs for an
explicit minimum curve bits, or perhaps a de facto implementer's rule?
Regards,
Pete Dettman
On 28/05/2016 12:19 AM, [email protected] wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Transport Layer Security of the IETF.
>
> Title : ECDHE_PSK with AES-GCM and AES-CCM Cipher Suites
> for Transport Layer Security (TLS)
> Authors : John Mattsson
> Daniel Migault
> Filename : draft-ietf-tls-ecdhe-psk-aead-00.txt
> Pages : 7
> Date : 2016-05-27
>
> Abstract:
> This document defines several new cipher suites for the Transport
> Layer Security (TLS) protocol. The cipher suites are all based on
> the Ephemeral Elliptic Curve Diffie-Hellman with Pre-Shared Key
> (ECDHE_PSK) key exchange together with the Authenticated Encryption
> with Associated Data (AEAD) algorithms AES-GCM and AES-CCM. PSK
> provides light and efficient authentication, ECDHE provides perfect
> forward secrecy, and AES-GCM and AES-CCM provides encryption and
> integrity protection.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tls-ecdhe-psk-aead/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-tls-ecdhe-psk-aead-00
>
>
> 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/
>
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