2 files changed, 12 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 0ab00336fe5..a31868f4ed1 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2011-06-21  Leo Liu  <sdl.web@gmail.com>
+
+        * subr.el (sha1): Implement sha1 using secure-hash.
+
 2011-06-21  Martin Rudalics  <rudalics@gmx.at>
 
         * window.el (display-buffer-alist): In default value do not
diff --git a/lisp/subr.el b/lisp/subr.el
index b328b7e17b7..4d2f3b1808c 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2600,6 +2600,14 @@ Otherwise, return nil."
         (get-char-property (1- (field-end pos)) 'field)
       raw-field)))
 
+(defun sha1 (object &optional start end binary)
+  "Return the SHA1 (Secure Hash Algorithm) of an OBJECT.
+OBJECT is either a string or a buffer.  Optional arguments START and
+END are character positions specifying which portion of OBJECT for
+computing the hash.  If BINARY is non-nil, return a string in binary
+form."
+  (secure-hash 'sha1 object start end binary))
+
 
 ;;;; Support for yanking and text properties.