+++ /dev/null
-;;; scram-md5.el --- Compute SCRAM-MD5.
-
-;; Copyright (C) 1999 Shuhei KOBAYASHI
-
-;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
-;; Kenichi OKADA <okada@opaopa.org>
-;; Keywords: SCRAM-MD5, HMAC-MD5, SASL, IMAP, POP, ACAP
-
-;; This file is part of FLIM (Faithful Library about Internet Message).
-
-;; This program 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 2, or
-;; (at your option) any later version.
-
-;; This program 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 this program; see the file COPYING. If not, write to
-;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; This program is implemented from draft-newman-auth-scram-03.txt.
-;;
-;; It is caller's responsibility to base64-decode challenges and
-;; base64-encode responses in IMAP4 AUTHENTICATE command.
-;;
-;; Passphrase should be longer than 16 bytes. (See RFC 2195)
-
-;; Examples.
-;;
-;; (scram-make-security-info nil t 0)
-;; => "^A^@^@^@"
-
-;;; Code:
-
-(require 'hmac-md5)
-(require 'unique-id)
-
-(defmacro scram-security-info-no-security-layer (security-info)
- `(eq (logand (aref ,security-info 0) 1) 1))
-(defmacro scram-security-info-integrity-protection-layer (security-info)
- `(eq (logand (aref ,security-info 0) 2) 2))
-(defmacro scram-security-info-buffer-size (security-info)
- `(let ((ssecinfo ,security-info))
- (+ (lsh (aref ssecinfo 1) 16)
- (lsh (aref ssecinfo 2) 8)
- (aref ssecinfo 3))))
-
-(defun scram-make-security-info (integrity-protection-layer
- no-security-layer buffer-size)
- (let ((csecinfo (make-string 4 0)))
- (when integrity-protection-layer
- (aset csecinfo 0 2))
- (if no-security-layer
- (aset csecinfo 0 (logior (aref csecinfo 0) 1))
- (aset csecinfo 1
- (lsh (logand buffer-size (lsh 255 16)) -16))
- (aset csecinfo 2
- (lsh (logand buffer-size (lsh 255 8)) -8))
- (aset csecinfo 3 (logand buffer-size 255)))
- csecinfo))
-
-(defun scram-make-unique-nonce () ; 8*OCTET, globally unique.
- ;; For example, concatenated string of process-identifier, system-clock,
- ;; sequence-number, random-number, and domain-name.
- (let (id)
- (unwind-protect
- (concat "<"
- (setq id (unique-id-m ".sasl"))
- "@" (system-name) ">")
- (fillarray id 0))))
-
-(defun scram-xor-string (str1 str2)
- ;; (length str1) == (length str2) == (length dst) == 16 (in SCRAM-MD5)
- (let* ((len (length str1))
- (dst (make-string len 0))
- (pos 0))
- (while (< pos len)
- (aset dst pos (logxor (aref str1 pos) (aref str2 pos)))
- (setq pos (1+ pos)))
- dst))
-
-(defun scram-md5-make-client-msg-1 (authenticate-id &optional authorize-id)
- "Make an initial client message from AUTHENTICATE-ID and AUTHORIZE-ID.
-If AUTHORIZE-ID is the same as AUTHENTICATE-ID, it may be omitted."
- (let (nonce)
- (unwind-protect
- (concat authorize-id "\0" authenticate-id "\0"
- (setq nonce (scram-make-unique-nonce)))
- (fillarray nonce 0))))
-
-(defun scram-md5-parse-server-msg-1 (server-msg-1)
- "Parse SERVER-MSG-1 and return a list of (SALT SECURITY-INFO SERVICE-ID)."
- (when (and (> (length server-msg-1) 16)
- (eq (string-match "[^@]+@[^\0]+\0" server-msg-1 12) 12))
- (list (substring server-msg-1 0 8) ; salt
- (substring server-msg-1 8 12) ; server-security-info
- (substring server-msg-1 ; service-id
- 12 (1- (match-end 0))))))
-
-(defun scram-md5-make-salted-pass (passphrase salt)
- (hmac-md5 salt passphrase))
-
-(defun scram-md5-make-client-key (salted-pass)
- (md5-binary salted-pass))
-
-(defun scram-md5-make-client-verifier (client-key)
- (md5-binary client-key))
-
-(defun scram-md5-make-shared-key (server-msg-1
- client-msg-1
- client-security-info
- client-verifier)
- (let (buff)
- (unwind-protect
- (hmac-md5
- (setq buff
- (concat server-msg-1 client-msg-1 client-security-info))
- client-verifier)
- (fillarray buff 0))))
-
-(defun scram-md5-make-client-proof (client-key shared-key)
- (scram-xor-string client-key shared-key))
-
-(defun scram-md5-make-client-msg-2 (client-security-info client-proof)
- (concat client-security-info client-proof))
-
-(defun scram-md5-make-server-msg-2 (server-msg-1
- client-msg-1
- client-security-info
- salt salted-pass)
- (let (buff server-salt)
- (setq server-salt
- (hmac-md5 salt salted-pass))
- (unwind-protect
- (hmac-md5
- (setq buff
- (concat
- client-msg-1
- server-msg-1
- client-security-info))
- server-salt)
- (fillarray server-salt 0)
- (fillarray buff 0))))
-
-(provide 'scram-md5)
-
-;;; scram-md5.el ends here
projects / elisp / wanderlust.git / blobdiff