diff --git a/file.php b/file.php
index 301b156..99bc48b 100644
--- a/file.php
+++ b/file.php
@@ -296,6 +296,28 @@ class file
     return $res;
   }
 
+
+  /** Calculate the md5 sum of a file
+    * @param $filename The file to hash
+    * @return the calulated hash
+    * @throws If the file doesn't exists
+    */
+  public function md5_file ($filename)
+  {
+    $this->debug (2, "md5_file ($filename)");
+    $filename = $this->realpath ($filename);
+    $this->checkPathRO (dirname ($filename));
+    if (! is_file ($filename))
+      throw new \Exception (sprintf (dgettext ("domframework",
+                                       "File '%s' is not a file"),
+                                       $filename), 500);
+    if (! is_readable ($filename))
+      throw new \Exception (sprintf (dgettext ("domframework",
+                                       "File '%s' is not readable"),
+                                       $filename), 500);
+    return md5_file ($filename);
+  }
+
   /** Create a new directory
     * @param $pathname The directory to create
     * @param $mode The mode to create (0777 by default)
@@ -517,6 +539,27 @@ class file
     return $res;
   }
 
+  /** Calculate the sha1 sum of a file
+    * @param $filename The file to hash
+    * @return the calulated hash
+    * @throws If the file doesn't exists
+    */
+  public function sha1_file ($filename)
+  {
+    $this->debug (2, "sha1_file ($filename)");
+    $filename = $this->realpath ($filename);
+    $this->checkPathRO (dirname ($filename));
+    if (! is_file ($filename))
+      throw new \Exception (sprintf (dgettext ("domframework",
+                                       "File '%s' is not a file"),
+                                       $filename), 500);
+    if (! is_readable ($filename))
+      throw new \Exception (sprintf (dgettext ("domframework",
+                                       "File '%s' is not readable"),
+                                       $filename), 500);
+    return sha1_file ($filename);
+  }
+
   /** Create a new file or update the timestamp if the file exists
     * @param string $filename the filename
     * @param int $time the timestamp to use (actual timestamp if not defined)