Add some tests for SimpleSAML\Utils\Crypto.

tests/lib/SimpleSAML/Utils/CryptoTest.php

+<?php
+
+
+/**
+ * Tests for SimpleSAML\Utils\Crypto.
+ */
+class CryptoTest extends PHPUnit_Framework_TestCase
+{
+
+    /**
+     * Test invalid input provided to the aesDecrypt() method.
+     *
+     * @expectedException InvalidArgumentException
+     */
+    public function testAesDecryptBadInput() {
+        SimpleSAML\Utils\Crypto::aesDecrypt(array());
+    }
+
+
+    /**
+     * Test that aesDecrypt() works properly, being able to decrypt some previously known (and correct)
+     * ciphertext.
+     */
+    public function testAesDecrypt() {
+        $c = SimpleSAML_Configuration::loadFromArray(array(
+            'secretsalt' => 'SUPER_SECRET_SALT',
+        ));
+
+        $plaintext  = 'SUPER_SECRET_TEXT';
+        $ciphertext = 'GA5lvW9TbAErqGvHFfZMUkdIg6zCJYmjFSGERAhByYNcMts70N4fWLjUm7/aVygPm55GbGhEG2himXJUHR1Ibg==';
+        $this->assertEquals($plaintext, SimpleSAML\Utils\Crypto::aesDecrypt(base64_decode($ciphertext)));
+    }
+
+
+    /**
+     * Test that aesEncrypt() produces ciphertexts that aesDecrypt() can decrypt.
+     */
+    public function testAesEncrypt() {
+        $c = SimpleSAML_Configuration::loadFromArray(array(
+            'secretsalt' => 'SUPER_SECRET_SALT',
+        ));
+
+        $original_plaintext = 'SUPER_SECRET_TEXT';
+        $ciphertext = SimpleSAML\Utils\Crypto::aesEncrypt($original_plaintext);
+        $decrypted_plaintext = SimpleSAML\Utils\Crypto::aesDecrypt($ciphertext);
+        $this->assertEquals($original_plaintext, $decrypted_plaintext);
+    }
+}