--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yms/validate-functions.php	Fri Jul 31 23:51:08 2009 -0400
@@ -0,0 +1,57 @@
+<?php
+
+function yms_send_reply($result, $api_key = '', $extra = array())
+{
+  header('Content-type: text/plain');
+  
+  global $g_api_key;
+  
+  if ( empty($api_key) )
+    $api_key = $g_api_key;
+  
+  if ( empty($api_key) )
+    $api_key = base64_encode("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00");
+  
+  $now = gmdate("Y-m-d\TH:i:s");
+  echo yms_generate_signed_response(array_merge($extra, array(
+      't' => $now,
+      'status' => $result
+    )), $api_key);
+  
+  exit;
+}
+
+function yms_generate_signed_response($response, $api_key)
+{
+  $hash = yms_val_sign($response, $api_key);
+  $result = "h={$hash}\n";
+  foreach ( $response as $key => $value )
+  {
+    $result .= "{$key}={$value}\n";
+  }
+  return trim($result);
+}
+
+function yms_val_sign($response, $api_key)
+{
+  foreach ( array('h', 'title', 'auth') as $key )
+    if ( isset($response[$key]) )
+      unset($response[$key]);
+    
+  ksort($response);
+  
+  $signstr = array();
+  foreach ( $response as $key => $value )
+  {
+    $signstr[] = "$key=$value";
+  }
+  
+  $signstr = implode('&', $signstr);
+  
+  $api_key = yms_hex_encode(base64_decode($api_key));
+  $hash = hmac_sha1($signstr, $api_key);
+  $hash = yms_hex_decode($hash);
+  $hash = base64_encode($hash);
+  
+  return $hash;
+}