diff --git a/phpseclib/Crypt/AES.php b/phpseclib/Crypt/AES.php
index 87bae702..7ad292b1 100644
--- a/phpseclib/Crypt/AES.php
+++ b/phpseclib/Crypt/AES.php
@@ -67,6 +67,7 @@ class AES extends Rijndael
      *
      * @see \phpseclib\Crypt\Rijndael::setBlockLength()
      * @access public
+     * @param int $length
      * @throws \BadMethodCallException anytime it's called
      */
     function setBlockLength($length)
@@ -92,7 +93,7 @@ class AES extends Rijndael
             case 256:
                 break;
             default:
-                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported');
+                throw new \LengthException('Key of size ' . $length . ' not supported by this algorithm. Only keys of sizes 128, 192 or 256 supported');
         }
         parent::setKeyLength($length);
     }
diff --git a/phpseclib/Crypt/Twofish.php b/phpseclib/Crypt/Twofish.php
index 4aad1a4d..ba2cd6db 100644
--- a/phpseclib/Crypt/Twofish.php
+++ b/phpseclib/Crypt/Twofish.php
@@ -402,7 +402,7 @@ class Twofish extends Base
             case 256:
                 break;
             default:
-                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported');
+                throw new \LengthException('Key of size ' . $length . ' not supported by this algorithm. Only keys of sizes 128, 192 or 256 supported');
         }
 
         parent::setKeyLength($length);