SCRAM-SHA-256(-PLUS) for ejabberd

[- Neustradamus -]

Hello all,

Currently there is only SCRAM-SHA-1 in ejabberd.

I search people to look the code for have more easy possibilities:
- SCRAM-SHA-1-PLUS
- SCRAM-SHA-224
- SCRAM-SHA-224-PLUS
- SCRAM-SHA-256
- SCRAM-SHA-256-PLUS
- SCRAM-SHA-384
- SCRAM-SHA-384-PLUS
- SCRAM-SHA-512
- SCRAM-SHA-512-PLUS

-PLUS variants -> "tls-unique"

Links:
- https://github.com/processone/fast_tls/blob/master/src/p1_sha.erl
- https://github.com/processone/xmpp/
- https://github.com/processone/ejabberd/
- https://github.com/processone/ejabberd-contrib/

RFCs:
- RFC5802: Salted Challenge Response Authentication Mechanism (SCRAM) SASL and GSS-API Mechanisms: https://tools.ietf.org/html/rfc5802
- 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
- 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
- RFC5803: Lightweight Directory Access Protocol (LDAP) Schema for Storing Salted: Challenge Response Authentication Mechanism (SCRAM) Secrets: https://tools.ietf.org/html/rfc5803
- RFC7804: Salted Challenge Response HTTP Authentication Mechanism: https://tools.ietf.org/html/rfc7804

IANA:
- Simple Authentication and Security Layer (SASL) Mechanisms: https://www.iana.org/assignments/sasl-mechanisms/sasl-mechanisms.xhtml
- Channel-Binding Types: https://www.iana.org/assignments/channel-binding-types/channel-binding-types.xhtml

Cyrus SASL supports:
- SCRAM-SHA-1
- SCRAM-SHA-1-PLUS
- SCRAM-SHA-224
- SCRAM-SHA-224-PLUS
- SCRAM-SHA-256
- SCRAM-SHA-256-PLUS
- SCRAM-SHA-384
- SCRAM-SHA-384-PLUS
- SCRAM-SHA-512
- SCRAM-SHA-512-PLUS
-> https://cyrusimap.org/sasl/sasl/authentication_mechanisms.html
-> https://github.com/cyrusimap/cyrus-sasl/commits/master

Dovecot SASL supports:
- SCRAM-SHA-1
-> https://doc.dovecot.org/configuration_manual/authentication/password_schemes/

GNU SASL supports:
- SCRAM-SHA-1
- SCRAM-SHA-1-PLUS
-> http://www.gnu.org/software/gsasl/

CRAM-MD5 to Historic:
- https://tools.ietf.org/html/draft-ietf-sasl-crammd5-to-historic-00 // 20 November 2008

RFC6331: Moving DIGEST-MD5 to Historic
- https://tools.ietf.org/html/rfc6331 since July 2011

More informations:
- https://github.com/scram-xmpp/info/issues/1

Thanks in advance for your help.

Regards,

Neustradamus