X-Git-Url: https://cgit.sxemacs.org/?a=blobdiff_plain;f=lisp%2Frfc2104.el;h=5496a4f81bff51a3ef329b0e1b205e29a58d76ab;hb=526ddd7a2ed50997a817053a9cc600be11ecb2ac;hp=54f36179c7f742fb81f630dd84cd2f2e1985a05c;hpb=16726c88a8af6b2289fb8637b118d1d3a895404f;p=gnus

diff --git a/lisp/rfc2104.el b/lisp/rfc2104.el
index 54f36179c..5496a4f81 100644
--- a/lisp/rfc2104.el
+++ b/lisp/rfc2104.el
@@ -1,5 +1,5 @@
 ;;; rfc2104.el --- RFC2104 Hashed Message Authentication Codes
-;; Copyright (C) 1998,1999 Free Software Foundation, Inc.
+;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
 
 ;; Author: Simon Josefsson <jas@pdc.kth.se>
 ;; Keywords: mail
@@ -31,10 +31,16 @@
 ;;; (rfc2104-hash 'md5 64 16 "Jefe" "what do ya want for nothing?")
 ;;; "750c783e6ab0b503eaa86e310a5db738"
 ;;;
+;;; (require 'sha-1)
+;;; (rfc2104-hash 'sha1-encode 64 20 "Jefe" "what do ya want for nothing?")
+;;; "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79"
+;;;
 ;;; 64 is block length of hash function (64 for MD5 and SHA), 16 is
 ;;; resulting hash length (16 for MD5, 20 for SHA).
 ;;;
 ;;; Tested with Emacs 20.2 and XEmacs 20.3.
+;;;
+;;; Test case reference: RFC 2202.
 
 ;;; Release history:
 ;;;
@@ -43,8 +49,12 @@
 ;;; 1998-08-26  don't require hexl
 ;;; 1998-09-25  renamed from hmac.el to rfc2104.el, also renamed functions
 ;;; 1999-10-23  included in pgnus
- 
-(require 'cl)
+;;; 2000-08-15  `rfc2104-hexstring-to-bitstring'
+;;; 2000-05-12  added sha-1 example, added test case reference
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
 
 ;; Magic character for inner HMAC round. 0x36 == 54 == '6'
 (defconst rfc2104-ipad ?\x36)
@@ -56,7 +66,7 @@
 (defconst rfc2104-zero ?\x00)
 
 ;; Alist for converting hex to decimal.
-(defconst rfc2104-hex-alist 
+(defconst rfc2104-hex-alist
   '((?0 . 0)	      (?a . 10)	      (?A . 10)
     (?1 . 1)	      (?b . 11)	      (?B . 11)
     (?2 . 2)	      (?c . 12)	      (?C . 12)
@@ -76,9 +86,16 @@
 	(rfc2104-hex-to-int (reverse (append str nil))))
     0))
 
+(defun rfc2104-hexstring-to-bitstring (str)
+  (let (out)
+    (while (< 0 (length str))
+      (push (rfc2104-hex-to-int (substring str -2)) out)
+      (setq str (substring str 0 -2)))
+    (concat out)))
+
 (defun rfc2104-hash (hash block-length hash-length key text)
   (let* (;; if key is longer than B, reset it to HASH(key)
-	 (key (if (> (length key) block-length) 
+	 (key (if (> (length key) block-length)
 		  (funcall hash key) key))
 	 (k_ipad (append key nil))
 	 (k_opad (append key nil)))
@@ -90,13 +107,11 @@
     ;; XOR key with ipad/opad into k_ipad/k_opad
     (setq k_ipad (mapcar (lambda (c) (logxor c rfc2104-ipad)) k_ipad))
     (setq k_opad (mapcar (lambda (c) (logxor c rfc2104-opad)) k_opad))
-    ;; perform inner hash
-    (let ((first-round (funcall hash (concat k_ipad text)))
-	  de-hexed)
-      (while (< 0 (length first-round))
-	(push (rfc2104-hex-to-int (substring first-round -2)) de-hexed)
-	(setq first-round (substring first-round 0 -2)))
-      ;; perform outer hash
-      (funcall hash (concat k_opad de-hexed)))))
+    ;; perform outer hash
+    (funcall hash (concat k_opad (rfc2104-hexstring-to-bitstring
+				  ;; perform inner hash
+				  (funcall hash (concat k_ipad text)))))))
 
 (provide 'rfc2104)
+
+;;; rfc2104.el ends here