recover padding functions which are still used

include/crypto.php

@@ -18,6 +18,21 @@ function rsa_verify($data,$sig,$key,$alg = 'sha256') {
 }
 
 
+
+function pkcs5_pad ($text, $blocksize)
+{
+    $pad = $blocksize - (strlen($text) % $blocksize);
+    return $text . str_repeat(chr($pad), $pad);
+}
+
+function pkcs5_unpad($text)
+{
+    $pad = ord($text{strlen($text)-1});
+    if ($pad > strlen($text)) return false;
+    if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
+    return substr($text, 0, -1 * $pad);
+} 
+
 function AES256CBC_encrypt($data,$key,$iv) {
 	return mcrypt_encrypt(
 		MCRYPT_RIJNDAEL_128,