<?php class Encryption_test extends CI_TestCase { public function set_up() { $this->encryption = new Mock_Libraries_Encryption(); } // -------------------------------------------------------------------- /** * __construct test * * Covers behavior with $config['encryption_key'] set or not */ public function test___construct() { // Assume no configuration from set_up() $this->assertNull($this->encryption->get_key()); // Try with an empty value $this->ci_set_config('encryption_key'); $this->encrypt = new Mock_Libraries_Encryption(); $this->assertNull($this->encrypt->get_key()); $this->ci_set_config('encryption_key', str_repeat("\x0", 16)); $this->encrypt = new Mock_Libraries_Encryption(); $this->assertEquals(str_repeat("\x0", 16), $this->encrypt->get_key()); } // -------------------------------------------------------------------- /** * hkdf() test * * Applies test vectors described in Appendix A(1-3) RFC5869. * Described vectors 4-7 SHA-1, which we don't support and are * therefore excluded. * * Because our implementation is a single method instead of being * split into hkdf_extract() and hkdf_expand(), we cannot test for * the PRK value. As long as the OKM is correct though, it's fine. * * @link https://tools.ietf.org/rfc/rfc5869.txt */ public function test_hkdf() { $vectors = array( // A.1: Basic test case with SHA-256 array( 'digest' => 'sha256', 'ikm' => "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b", 'salt' => "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c", 'length' => 42, 'info' => "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9", // 'prk' => "\x07\x77\x09\x36\x2c\x2e\x32\xdf\x0d\xdc\x3f\x0d\xc4\x7b\xba\x63\x90\xb6\xc7\x3b\xb5\x0f\x9c\x31\x22\xec\x84\x4a\xd7\xc2\xb3\xe5", 'okm' => "\x3c\xb2\x5f\x25\xfa\xac\xd5\x7a\x90\x43\x4f\x64\xd0\x36\x2f\x2a\x2d\x2d\x0a\x90\xcf\x1a\x5a\x4c\x5d\xb0\x2d\x56\xec\xc4\xc5\xbf\x34\x00\x72\x08\xd5\xb8\x87\x18\x58\x65" ), // A.2: Test with SHA-256 and longer inputs/outputs array( 'digest' => 'sha256', 'ikm' => "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f", 'salt' => "\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf", 'length' => 82, 'info' => "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff", // 'prk' => "\x06\xa6\xb8\x8c\x58\x53\x36\x1a\x06\x10\x4c\x9c\xeb\x35\xb4\x5c\xef\x76\x00\x14\x90\x46\x71\x01\x4a\x19\x3f\x40\xc1\x5f\xc2\x44", 'okm' => "\xb1\x1e\x39\x8d\xc8\x03\x27\xa1\xc8\xe7\xf7\x8c\x59\x6a\x49\x34\x4f\x01\x2e\xda\x2d\x4e\xfa\xd8\xa0\x50\xcc\x4c\x19\xaf\xa9\x7c\x59\x04\x5a\x99\xca\xc7\x82\x72\x71\xcb\x41\xc6\x5e\x59\x0e\x09\xda\x32\x75\x60\x0c\x2f\x09\xb8\x36\x77\x93\xa9\xac\xa3\xdb\x71\xcc\x30\xc5\x81\x79\xec\x3e\x87\xc1\x4c\x01\xd5\xc1\xf3\x43\x4f\x1d\x87", ), // A.3: Test with SHA-256 and zero-length salt/info array( 'digest' => 'sha256', 'ikm' => "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b", 'salt' => '', 'length' => 42, 'info' => '', // 'prk' => "\x19\xef\x24\xa3\x2c\x71\x7b\x16\x7f\x33\xa9\x1d\x6f\x64\x8b\xdf\x96\x59\x67\x76\xaf\xdb\x63\x77\xac\x43\x4c\x1c\x29\x3c\xcb\x04", 'okm' => "\x8d\xa4\xe7\x75\xa5\x63\xc1\x8f\x71\x5f\x80\x2a\x06\x3c\x5a\x31\xb8\xa1\x1f\x5c\x5e\xe1\x87\x9e\xc3\x45\x4e\x5f\x3c\x73\x8d\x2d\x9d\x20\x13\x95\xfa\xa4\xb6\x1a\x96\xc8", ) ); foreach ($vectors as $test) { $this->assertEquals( $test['okm'], $this->encryption->hkdf( $test['ikm'], $test['digest'], $test['salt'], $test['length'], $test['info'] ) ); } // Test default length, it must match the digest size $this->assertEquals(64, strlen($this->encryption->hkdf('foobar', 'sha512'))); // Test maximum length (RFC5869 says that it must be up to 255 times the digest size) $this->assertEquals(12240, strlen($this->encryption->hkdf('foobar', 'sha384', NULL, 48 * 255))); $this->assertFalse($this->encryption->hkdf('foobar', 'sha224', NULL, 28 * 255 + 1)); // CI-specific test for an invalid digest $this->assertFalse($this->encryption->hkdf('fobar', 'sha1')); } // -------------------------------------------------------------------- /** * _get_params() test */ public function test__get_params() { $key = str_repeat("\x0", 16); // Invalid custom parameters $params = array( // No cipher, mode or key array('cipher' => 'aes-128', 'mode' => 'cbc'), array('cipher' => 'aes-128', 'key' => $key), array('mode' => 'cbc', 'key' => $key), // No HMAC key or not a valid digest array('cipher' => 'aes-128', 'mode' => 'cbc', 'key' => $key), array('cipher' => 'aes-128', 'mode' => 'cbc', 'key' => $key, 'hmac_digest' => 'sha1', 'hmac_key' => $key), // Invalid mode array('cipher' => 'aes-128', 'mode' => 'foo', 'key' => $key, 'hmac_digest' => 'sha256', 'hmac_key' => $key) ); for ($i = 0, $c = count($params); $i < $c; $i++) { $this->assertFalse($this->encryption->__get_params($params[$i])); } // Valid parameters $params = array( 'cipher' => 'aes-128', 'mode' => 'cbc', 'key' => str_repeat("\x0", 16), 'hmac_key' => str_repeat("\x0", 16) ); $this->assertTrue(is_array($this->encryption->__get_params($params))); $params['base64'] = TRUE; $params['hmac_digest'] = 'sha512'; // Including all parameters $params = array( 'cipher' => 'aes-128', 'mode' => 'cbc', 'key' => str_repeat("\x0", 16), 'raw_data' => TRUE, 'hmac_key' => str_repeat("\x0", 16), 'hmac_digest' => 'sha256' ); $output = $this->encryption->__get_params($params); unset($output['handle'], $output['cipher'], $params['raw_data'], $params['cipher']); $params['base64'] = FALSE; $this->assertEquals($params, $output); // HMAC disabled unset($params['hmac_key'], $params['hmac_digest']); $params['hmac'] = $params['raw_data'] = FALSE; $params['cipher'] = 'aes-128'; $output = $this->encryption->__get_params($params); unset($output['handle'], $output['cipher'], $params['hmac'], $params['raw_data'], $params['cipher']); $params['base64'] = TRUE; $params['hmac_digest'] = $params['hmac_key'] = NULL; $this->assertEquals($params, $output); } // -------------------------------------------------------------------- /** * initialize(), encrypt(), decrypt() test * * Testing the three methods separately is not realistic as they are * designed to work together. A more thorough test for initialize() * though is the OpenSSL/MCrypt compatibility test. * * @depends test_hkdf * @depends test__get_params */ public function test_initialize_encrypt_decrypt() { $message = 'This is a plain-text message.'; $key = "\xd0\xc9\x08\xc4\xde\x52\x12\x6e\xf8\xcc\xdb\x03\xea\xa0\x3a\x5c"; // Default state (AES-128/Rijndael-128 in CBC mode) $this->encryption->initialize(array('key' => $key)); // Was the key properly set? $this->assertEquals($key, $this->encryption->get_key()); $this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message))); // Try DES in ECB mode, just for the sake of changing stuff $this->encryption->initialize(array('cipher' => 'des', 'mode' => 'ecb', 'key' => substr($key, 0, 8))); $this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message))); } // -------------------------------------------------------------------- /** * encrypt(), decrypt test with custom parameters * * @depends test___get_params */ public function test_encrypt_decrypt_custom() { $message = 'Another plain-text message.'; // A random invalid parameter $this->assertFalse($this->encryption->encrypt($message, array('foo'))); $this->assertFalse($this->encryption->decrypt($message, array('foo'))); // No HMAC, binary output $params = array( 'cipher' => 'tripledes', 'mode' => 'cfb', 'key' => str_repeat("\x1", 16), 'base64' => FALSE, 'hmac' => FALSE ); $ciphertext = $this->encryption->encrypt($message, $params); $this->assertEquals($message, $this->encryption->decrypt($ciphertext, $params)); } // -------------------------------------------------------------------- /** * _mcrypt_get_handle() test */ public function test__mcrypt_get_handle() { if ($this->encryption->drivers['mcrypt'] === FALSE) { return $this->markTestSkipped('Cannot test MCrypt because it is not available.'); } $this->assertTrue(is_resource($this->encryption->__driver_get_handle('mcrypt', 'rijndael-128', 'cbc'))); } // -------------------------------------------------------------------- /** * _openssl_get_handle() test */ public function test__openssl_mcrypt_get_handle() { if ($this->encryption->drivers['openssl'] === FALSE) { return $this->markTestSkipped('Cannot test OpenSSL because it is not available.'); } $this->assertEquals('aes-128-cbc', $this->encryption->__driver_get_handle('openssl', 'aes-128', 'cbc')); $this->assertEquals('rc4-40', $this->encryption->__driver_get_handle('openssl', 'rc4-40', 'stream')); } // -------------------------------------------------------------------- /** * OpenSSL/MCrypt portability test * * Amongst the obvious stuff, _cipher_alias() is also tested here. */ public function test_portability() { if ( ! $this->encryption->drivers['mcrypt'] OR ! $this->encryption->drivers['openssl']) { $this->markTestSkipped('Both MCrypt and OpenSSL support are required for portability tests.'); return; } $message = 'This is a message encrypted via MCrypt and decrypted via OpenSSL, or vice-versa.'; // Format is: <Cipher name>, <Cipher mode>, <Key size> $portable = array( array('aes-128', 'cbc', 16), array('aes-128', 'cfb', 16), array('aes-128', 'cfb8', 16), array('aes-128', 'ofb', 16), array('aes-128', 'ecb', 16), array('aes-128', 'ctr', 16), array('aes-192', 'cbc', 24), array('aes-192', 'cfb', 24), array('aes-192', 'cfb8', 24), array('aes-192', 'ofb', 24), array('aes-192', 'ecb', 24), array('aes-192', 'ctr', 24), array('aes-256', 'cbc', 32), array('aes-256', 'cfb', 32), array('aes-256', 'cfb8', 32), array('aes-256', 'ofb', 32), array('aes-256', 'ecb', 32), array('aes-256', 'ctr', 32), array('des', 'cbc', 7), array('des', 'cfb', 7), array('des', 'cfb8', 7), array('des', 'ofb', 7), array('des', 'ecb', 7), array('tripledes', 'cbc', 7), array('tripledes', 'cfb', 7), array('tripledes', 'cfb8', 7), array('tripledes', 'ofb', 7), array('tripledes', 'cbc', 14), array('tripledes', 'cfb', 14), array('tripledes', 'cfb8', 14), array('tripledes', 'ofb', 14), array('tripledes', 'cbc', 21), array('tripledes', 'cfb', 21), array('tripledes', 'cfb8', 21), array('tripledes', 'ofb', 21), array('blowfish', 'cbc', 16), array('blowfish', 'cfb', 16), array('blowfish', 'ofb', 16), array('blowfish', 'ecb', 16), array('blowfish', 'cbc', 56), array('blowfish', 'cfb', 56), array('blowfish', 'ofb', 56), array('blowfish', 'ecb', 56), array('cast5', 'cbc', 11), array('cast5', 'cfb', 11), array('cast5', 'ofb', 11), array('cast5', 'ecb', 11), array('cast5', 'cbc', 16), array('cast5', 'cfb', 16), array('cast5', 'ofb', 16), array('cast5', 'ecb', 16), array('rc4', 'stream', 5), array('rc4', 'stream', 8), array('rc4', 'stream', 16), array('rc4', 'stream', 32), array('rc4', 'stream', 64), array('rc4', 'stream', 128), array('rc4', 'stream', 256) ); $driver_index = array('mcrypt', 'openssl'); foreach ($portable as &$test) { // Add some randomness to the selected driver $driver = mt_rand(0,1); $params = array( 'driver' => $driver_index[$driver], 'cipher' => $test[0], 'mode' => $test[1], 'key' => openssl_random_pseudo_bytes($test[2]) ); $this->encryption->initialize($params); $ciphertext = $this->encryption->encrypt($message); $driver = (int) ! $driver; $params['driver'] = $driver_index[$driver]; $this->encryption->initialize($params); $this->assertEquals($message, $this->encryption->decrypt($ciphertext)); } } // -------------------------------------------------------------------- /** * __get() test */ public function test_magic_get() { $this->assertNull($this->encryption->foo); $this->assertEquals(array('mcrypt', 'openssl'), array_keys($this->encryption->drivers)); // 'stream' mode is translated into an empty string for OpenSSL $this->encryption->initialize(array('cipher' => 'rc4', 'mode' => 'stream')); $this->assertEquals('stream', $this->encryption->mode); } }