Add SASL SCRAM-SHA-256 support.

* lisp/net/sasl.el (sasl-mechanisms): Add SCRAM-SHA-256.
(sasl-mechanism-alist): Ditto.
* lisp/net/sasl-scram-sha256.el: New file.
* tests/lisp/net/sasl-scram-rfc-tests.el (sasl-scram-sha-256-test):
New function.

2 files changed, 62 insertions, 2 deletions

diff --git a/lisp/net/sasl-scram-sha256.el b/lisp/net/sasl-scram-sha256.el
new file mode 100644
index 00000000000..e50a032c233
--- /dev/null
+++ b/lisp/net/sasl-scram-sha256.el
@@ -0,0 +1,59 @@
+;;; sasl-scram-sha256.el --- SCRAM-SHA-256 module for the SASL client framework  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; Author: Simon Josefsson <simon@josefsson.org>
+;; Package: sasl
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Implement the SCRAM-SHA-256 mechanism from RFC 7677.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'sasl)
+(require 'hex-util)
+(require 'rfc2104)
+(require 'sasl-scram-rfc)
+
+;;; SCRAM-SHA-256
+
+(defconst sasl-scram-sha-256-steps
+  '(sasl-scram-client-first-message
+    sasl-scram-sha-256-client-final-message
+    sasl-scram-sha-256-authenticate-server))
+
+(defun sasl-scram-sha256 (object &optional start end binary)
+  (secure-hash 'sha256 object start end binary))
+
+(defun sasl-scram-sha-256-client-final-message (client step)
+  (sasl-scram--client-final-message
+   ;; HMAC-SHA256 uses block length 64 and hash length 32; see RFC 4634.
+   'sasl-scram-sha256 64 32 client step))
+
+(defun sasl-scram-sha-256-authenticate-server (client step)
+  (sasl-scram--authenticate-server
+   'sasl-scram-sha256 64 32 client step))
+
+(put 'sasl-scram-sha256 'sasl-mechanism
+     (sasl-make-mechanism "SCRAM-SHA-256" sasl-scram-sha-256-steps))
+
+(provide 'sasl-scram-sha256)
+
+;;; sasl-scram-sha256.el ends here
diff --git a/lisp/net/sasl.el b/lisp/net/sasl.el
index 4405c904cd3..ab118e1f982 100644
--- a/lisp/net/sasl.el
+++ b/lisp/net/sasl.el
@@ -35,8 +35,8 @@
 ;;; Code:
 
 (defvar sasl-mechanisms
-  '("SCRAM-SHA-1" "CRAM-MD5" "DIGEST-MD5" "PLAIN" "LOGIN" "ANONYMOUS"
-    "NTLM"))
+  '("SCRAM-SHA-256" "SCRAM-SHA-1" "CRAM-MD5" "DIGEST-MD5" "PLAIN" "LOGIN"
+    "ANONYMOUS" "NTLM"))
 
 (defvar sasl-mechanism-alist
   '(("CRAM-MD5" sasl-cram)
@@ -45,6 +45,7 @@
     ("LOGIN" sasl-login)
     ("ANONYMOUS" sasl-anonymous)
     ("NTLM" sasl-ntlm)
+    ("SCRAM-SHA-256" sasl-scram-sha256)
     ("SCRAM-SHA-1" sasl-scram-rfc)))
 
 (defvar sasl-unique-id-function #'sasl-unique-id-function)