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<?php
/**
 * CakePHP(tm) Tests <http://book.cakephp.org/2.0/en/development/testing.html>
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://book.cakephp.org/2.0/en/development/testing.html CakePHP(tm) Tests
 * @since         CakePHP(tm) v 1.2.0.5432
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

App::uses('Security', 'Utility');

/**
 * SecurityTest class
 *
 * @package       Cake.Test.Case.Utility
 */
class SecurityTest extends CakeTestCase {

/**
 * sut property
 *
 * @var mixed
 */
        public $sut = null;

/**
 * testInactiveMins method
 *
 * @return void
 */
        public function testInactiveMins() {
                Configure::write('Security.level', 'high');
                $this->assertEquals(10, Security::inactiveMins());

                Configure::write('Security.level', 'medium');
                $this->assertEquals(100, Security::inactiveMins());

                Configure::write('Security.level', 'low');
                $this->assertEquals(300, Security::inactiveMins());
        }

/**
 * testGenerateAuthkey method
 *
 * @return void
 */
        public function testGenerateAuthkey() {
                $this->assertEquals(strlen(Security::generateAuthKey()), 40);
        }

/**
 * testValidateAuthKey method
 *
 * @return void
 */
        public function testValidateAuthKey() {
                $authKey = Security::generateAuthKey();
                $this->assertTrue(Security::validateAuthKey($authKey));
        }

/**
 * testHashInvalidSalt method
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testHashInvalidSalt() {
                Security::hash('someKey', 'blowfish', true);
        }

/**
 * testHashAnotherInvalidSalt
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testHashAnotherInvalidSalt() {
                Security::hash('someKey', 'blowfish', '$1$lksdjoijfaoijs');
        }

/**
 * testHashYetAnotherInvalidSalt
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testHashYetAnotherInvalidSalt() {
                Security::hash('someKey', 'blowfish', '$2a$10$123');
        }

/**
 * testHashInvalidCost method
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testHashInvalidCost() {
                Security::setCost(1000);
        }
/**
 * testHash method
 *
 * @return void
 */
        public function testHash() {
                $_hashType = Security::$hashType;

                $key = 'someKey';
                $hash = 'someHash';

                $this->assertSame(40, strlen(Security::hash($key, null, false)));
                $this->assertSame(40, strlen(Security::hash($key, 'sha1', false)));
                $this->assertSame(40, strlen(Security::hash($key, null, true)));
                $this->assertSame(40, strlen(Security::hash($key, 'sha1', true)));

                $result = Security::hash($key, null, $hash);
                $this->assertSame($result, 'e38fcb877dccb6a94729a81523851c931a46efb1');

                $result = Security::hash($key, 'sha1', $hash);
                $this->assertSame($result, 'e38fcb877dccb6a94729a81523851c931a46efb1');

                $hashType = 'sha1';
                Security::setHash($hashType);
                $this->assertSame($hashType, Security::$hashType);
                $this->assertSame(40, strlen(Security::hash($key, null, true)));
                $this->assertSame(40, strlen(Security::hash($key, null, false)));

                $this->assertSame(32, strlen(Security::hash($key, 'md5', false)));
                $this->assertSame(32, strlen(Security::hash($key, 'md5', true)));

                $hashType = 'md5';
                Security::setHash($hashType);
                $this->assertSame($hashType, Security::$hashType);
                $this->assertSame(32, strlen(Security::hash($key, null, false)));
                $this->assertSame(32, strlen(Security::hash($key, null, true)));

                if (!function_exists('hash') && !function_exists('mhash')) {
                        $this->assertSame(32, strlen(Security::hash($key, 'sha256', false)));
                        $this->assertSame(32, strlen(Security::hash($key, 'sha256', true)));
                } else {
                        $this->assertSame(64, strlen(Security::hash($key, 'sha256', false)));
                        $this->assertSame(64, strlen(Security::hash($key, 'sha256', true)));
                }

                Security::setHash($_hashType);
        }

/**
 * Test that hash() works with blowfish.
 *
 * @return void
 */
        public function testHashBlowfish() {
                Security::setCost(10);
                $test = Security::hash('password', 'blowfish');
                $this->skipIf(strpos($test, '$2a$') === false, 'Blowfish hashes are incorrect.');

                $_hashType = Security::$hashType;

                $key = 'someKey';
                $hashType = 'blowfish';
                Security::setHash($hashType);

                $this->assertSame($hashType, Security::$hashType);
                $this->assertSame(60, strlen(Security::hash($key, null, false)));

                $password = $submittedPassword = $key;
                $storedPassword = Security::hash($password);

                $hashedPassword = Security::hash($submittedPassword, null, $storedPassword);
                $this->assertSame($storedPassword, $hashedPassword);

                $submittedPassword = 'someOtherKey';
                $hashedPassword = Security::hash($submittedPassword, null, $storedPassword);
                $this->assertNotSame($storedPassword, $hashedPassword);

                $expected = sha1('customsaltsomevalue');
                $result = Security::hash('somevalue', 'sha1', 'customsalt');
                $this->assertSame($expected, $result);

                $oldSalt = Configure::read('Security.salt');
                Configure::write('Security.salt', 'customsalt');

                $expected = sha1('customsaltsomevalue');
                $result = Security::hash('somevalue', 'sha1', true);
                $this->assertSame($expected, $result);

                Configure::write('Security.salt', $oldSalt);
                Security::setHash($_hashType);
        }

/**
 * testCipher method
 *
 * @return void
 */
        public function testCipher() {
                $length = 10;
                $txt = '';
                for ($i = 0; $i < $length; $i++) {
                        $txt .= mt_rand(0, 255);
                }
                $key = 'my_key';
                $result = Security::cipher($txt, $key);
                $this->assertEquals($txt, Security::cipher($result, $key));

                $txt = '';
                $key = 'my_key';
                $result = Security::cipher($txt, $key);
                $this->assertEquals($txt, Security::cipher($result, $key));

                $txt = 123456;
                $key = 'my_key';
                $result = Security::cipher($txt, $key);
                $this->assertEquals($txt, Security::cipher($result, $key));

                $txt = '123456';
                $key = 'my_key';
                $result = Security::cipher($txt, $key);
                $this->assertEquals($txt, Security::cipher($result, $key));
        }

/**
 * testCipherEmptyKey method
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testCipherEmptyKey() {
                $txt = 'some_text';
                $key = '';
                Security::cipher($txt, $key);
        }

/**
 * testRijndael method
 *
 * @return void
 */
        public function testRijndael() {
                $this->skipIf(!function_exists('mcrypt_encrypt'));
                $txt = 'The quick brown fox jumped over the lazy dog.';
                $key = 'DYhG93b0qyJfIxfs2guVoUubWwvniR2G0FgaC9mi';

                $result = Security::rijndael($txt, $key, 'encrypt');
                $this->assertEquals($txt, Security::rijndael($result, $key, 'decrypt'));

                $result = Security::rijndael($key, $txt, 'encrypt');
                $this->assertEquals($key, Security::rijndael($result, $txt, 'decrypt'));

                $result = Security::rijndael('', $key, 'encrypt');
                $this->assertEquals('', Security::rijndael($result, $key, 'decrypt'));

                $key = 'this is my key of over 32 chars, yes it is';
                $result = Security::rijndael($txt, $key, 'encrypt');
                $this->assertEquals($txt, Security::rijndael($result, $key, 'decrypt'));
        }

/**
 * Test that rijndael() can still decrypt values with a fixed iv.
 *
 * @return void
 */
        public function testRijndaelBackwardCompatibility() {
                $this->skipIf(!function_exists('mcrypt_encrypt'));

                $txt = 'The quick brown fox jumped over the lazy dog.';
                $key = 'DYhG93b0qyJfIxfs2guVoUubWwvniR2G0FgaC9mi';

                // Encrypted before random iv
                $value = base64_decode('1WPjnq96LMzLGwNgmudHF+cAIqVUN5DaUZEpf5tm1EzSgt5iYY9o3d66iRI/fKJLTlTVGsa8HzW0jDNitmVXoQ==');
                $this->assertEquals($txt, Security::rijndael($value, $key, 'decrypt'));
        }

/**
 * testRijndaelInvalidOperation method
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testRijndaelInvalidOperation() {
                $txt = 'The quick brown fox jumped over the lazy dog.';
                $key = 'DYhG93b0qyJfIxfs2guVoUubWwvniR2G0FgaC9mi';
                Security::rijndael($txt, $key, 'foo');
        }

/**
 * testRijndaelInvalidKey method
 *
 * @expectedException PHPUnit_Framework_Error
 * @return void
 */
        public function testRijndaelInvalidKey() {
                $txt = 'The quick brown fox jumped over the lazy dog.';
                $key = 'too small';
                Security::rijndael($txt, $key, 'encrypt');
        }

/**
 * Test encrypt/decrypt.
 *
 * @return void
 */
        public function testEncryptDecrypt() {
                $txt = 'The quick brown fox';
                $key = 'This key is longer than 32 bytes long.';
                $result = Security::encrypt($txt, $key);
                $this->assertNotEquals($txt, $result, 'Should be encrypted.');
                $this->assertNotEquals($result, Security::encrypt($txt, $key), 'Each result is unique.');
                $this->assertEquals($txt, Security::decrypt($result, $key));
        }

/**
 * Test that changing the key causes decryption to fail.
 *
 * @return void
 */
        public function testDecryptKeyFailure() {
                $txt = 'The quick brown fox';
                $key = 'This key is longer than 32 bytes long.';
                $result = Security::encrypt($txt, $key);

                $key = 'Not the same key. This one will fail';
                $this->assertFalse(Security::decrypt($txt, $key), 'Modified key will fail.');
        }

/**
 * Test that decrypt fails when there is an hmac error.
 *
 * @return void
 */
        public function testDecryptHmacFailure() {
                $txt = 'The quick brown fox';
                $key = 'This key is quite long and works well.';
                $salt = 'this is a delicious salt!';
                $result = Security::encrypt($txt, $key, $salt);

                // Change one of the bytes in the hmac.
                $result[10] = 'x';
                $this->assertFalse(Security::decrypt($result, $key, $salt), 'Modified hmac causes failure.');
        }

/**
 * Test that changing the hmac salt will cause failures.
 *
 * @return void
 */
        public function testDecryptHmacSaltFailure() {
                $txt = 'The quick brown fox';
                $key = 'This key is quite long and works well.';
                $salt = 'this is a delicious salt!';
                $result = Security::encrypt($txt, $key, $salt);

                $salt = 'humpty dumpty had a great fall.';
                $this->assertFalse(Security::decrypt($result, $key, $salt), 'Modified salt causes failure.');
        }

/**
 * Test that short keys cause errors
 *
 * @expectedException CakeException
 * @expectedExceptionMessage Invalid key for encrypt(), key must be at least 256 bits (32 bytes) long.
 * @return void
 */
        public function testEncryptInvalidKey() {
                $txt = 'The quick brown fox jumped over the lazy dog.';
                $key = 'this is too short';
                Security::encrypt($txt, $key);
        }

/**
 * Test encrypting falsey data
 *
 * @return void
 */
        public function testEncryptDecryptFalseyData() {
                $key = 'This is a key that is long enough to be ok.';

                $result = Security::encrypt('', $key);
                $this->assertSame('', Security::decrypt($result, $key));

                $result = Security::encrypt(false, $key);
                $this->assertSame('', Security::decrypt($result, $key));

                $result = Security::encrypt(null, $key);
                $this->assertSame('', Security::decrypt($result, $key));

                $result = Security::encrypt(0, $key);
                $this->assertSame('0', Security::decrypt($result, $key));

                $result = Security::encrypt('0', $key);
                $this->assertSame('0', Security::decrypt($result, $key));
        }

/**
 * Test that short keys cause errors
 *
 * @expectedException CakeException
 * @expectedExceptionMessage Invalid key for decrypt(), key must be at least 256 bits (32 bytes) long.
 * @return void
 */
        public function testDecryptInvalidKey() {
                $txt = 'The quick brown fox jumped over the lazy dog.';
                $key = 'this is too short';
                Security::decrypt($txt, $key);
        }

/**
 * Test that empty data cause errors
 *
 * @expectedException CakeException
 * @expectedExceptionMessage The data to decrypt cannot be empty.
 * @return void
 */
        public function testDecryptInvalidData() {
                $txt = '';
                $key = 'This is a key that is long enough to be ok.';
                Security::decrypt($txt, $key);
        }

}