add the ability to set iterations

examples/decrypt.php

@@ -8,6 +8,8 @@ $base64Encrypted = "AgGXutvFqW9RqQuokYLjehbfM7F+8OO/2sD8g3auA+oNCQFoarRmc59qcKJv
     . 'EN7Cv";
 
 $cryptor = new \RNCryptor\RNCryptor\Decryptor;
+//uncomment the following line to set iterations
+//$cryptor->setIterations(1);
 $plaintext = $cryptor->decrypt($base64Encrypted, $password);
 
 echo "Base64 Encrypted:\n$base64Encrypted\n\n";

examples/encrypt.php

@@ -6,6 +6,8 @@ $password = "myPassword";
 $plaintext = "Here is my test vector. It's not too long, but more than a block and needs padding.";
 
 $cryptor = new \RNCryptor\RNCryptor\Encryptor;
+//uncomment the following line to set iterations
+//$cryptor->setIterations(1);
 $base64Encrypted = $cryptor->encrypt($plaintext, $password);
 
 echo "Plaintext:\n$plaintext\n\n";

src/RNCryptor/Cryptor.php

@@ -9,6 +9,12 @@ class Cryptor
 
     protected $config;
 
+    protected $iterations = 10000;
+
+	public function setIterations($num) {
+		$this->iterations = $num;
+	}
+
     public function generateKey($salt, $password, $version = self::DEFAULT_SCHEMA_VERSION)
     {
         $this->configure($version);
@@ -84,7 +90,7 @@ class Cryptor
 
         $config->pbkdf2 = new stdClass;
         $config->pbkdf2->prf = 'sha1';
-        $config->pbkdf2->iterations = 10000;
+        $config->pbkdf2->iterations = $this->iterations;
         $config->pbkdf2->keyLength = 32;
 
         $config->hmac = new stdClass();