(rfc2104-hexstring-to-bitstring): New function.

[gnus] / lisp / rfc2104.el

diff --git a/lisp/rfc2104.el b/lisp/rfc2104.el
index c825d8b..3d45982 100644 (file)
--- a/lisp/rfc2104.el
+++ b/lisp/rfc2104.el
@@ -49,6 +49,7 @@
 ;;; 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
+;;; 2000-08-15  `rfc2104-hexstring-to-bitstring'
 ;;; 2000-05-12  added sha-1 example, added test case reference
  
 (eval-when-compile (require 'cl))
@@ -83,6 +84,13 @@
        (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) 
@@ -97,14 +105,10 @@
     ;; 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)