-PLUS variants for SCRAM

[Neustradamus]

There is no indication about RFC7677: SCRAM-SHA-256 and SCRAM-SHA-256-PLUS Simple Authentication and Security Layer (SASL) Mechanisms

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"When using the SASL SCRAM mechanism, the SCRAM-SHA-256-PLUS variant SHOULD be preferred over the SCRAM-SHA-256 variant, and SHA-256 variants [RFC7677] SHOULD be preferred over SHA-1 variants [RFC5802]".

• SCRAM-SHA-1(-PLUS):
  -- RFC5802: Salted Challenge Response Authentication Mechanism (SCRAM) SASL and GSS-API Mechanisms: https://tools.ietf.org/html/rfc5802
  -- RFC6120: Extensible Messaging and Presence Protocol (XMPP): Core: https://tools.ietf.org/html/rfc6120

• SCRAM-SHA-256(-PLUS):
  -- RFC7677: SCRAM-SHA-256 and SCRAM-SHA-256-PLUS Simple Authentication and Security Layer (SASL) Mechanisms: https://tools.ietf.org/html/rfc7677 - since 2015-11-02
  -- RFC8600: Using Extensible Messaging and Presence Protocol (XMPP) for Security Information Exchange: https://tools.ietf.org/html/rfc8600 - since 2019-06-21: https://mailarchive.ietf.org/arch/msg/ietf-announce/suJMmeMhuAOmGn_PJYgX5Vm8lNA

• SCRAM-SHA-512(-PLUS):
  -- https://tools.ietf.org/html/draft-melnikov-scram-sha-512

• SCRAM-SHA3-512(-PLUS):
  -- https://tools.ietf.org/html/draft-melnikov-scram-sha3-512

https://xmpp.org/extensions/inbox/hash-recommendations.html

-PLUS variants:

• RFC5056: On the Use of Channel Bindings to Secure Channels: https://tools.ietf.org/html/rfc5056
• RFC5929: Channel Bindings for TLS: https://tools.ietf.org/html/rfc5929
• Channel-Binding Types: https://www.iana.org/assignments/channel-binding-types/channel-binding-types.xhtml
• RFC 9266: Channel Bindings for TLS 1.3: https://tools.ietf.org/html/rfc9266

LDAP:

• RFC5803: Lightweight Directory Access Protocol (LDAP) Schema for Storing Salted: Challenge Response Authentication Mechanism (SCRAM) Secrets: https://tools.ietf.org/html/rfc5803

HTTP:

• RFC7804: Salted Challenge Response HTTP Authentication Mechanism: https://tools.ietf.org/html/rfc7804

2FA:

• Extensions to Salted Challenge Response (SCRAM) for 2 factor authentication: https://tools.ietf.org/html/draft-melnikov-scram-2fa

IANA:

• Simple Authentication and Security Layer (SASL) Mechanisms: https://www.iana.org/assignments/sasl-mechanisms/sasl-mechanisms.xhtml

Linked to:

• State of Play scram-sasl/info#1

[ogrebgr]

Sorry, I am not sure what are you asking exactly...
Supported algos are: SCRAM-SHA-1, SCRAM-SHA-256, SCRAM-SHA-512.
I don't know that the "-PLUS" means...

[Neustradamus]

SCRAM-SHA-256 is from RFC7677 ;)

-PLUS variants are in RFC5802 and RFC7677 too.

Can you add support of Channel Bindings?

[ogrebgr]

Yes, I can but currently I don't have much free time... :-(
Do you need this urgently?

[Neustradamus]

It is official, it is here: RFC 9266: Channel Bindings for TLS 1.3:

• https://tools.ietf.org/html/rfc9266