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tgseclib/tests/Unit/Crypt/AES/TestCase.php

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<?php
/**
* @author Andreas Fischer <bantu@phpbb.com>
* @copyright 2013 Andreas Fischer
* @license http://www.opensource.org/licenses/mit-license.html MIT License
*/
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require_once 'Crypt/AES.php';
abstract class Unit_Crypt_AES_TestCase extends PhpseclibTestCase
{
protected $engine;
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private function _checkEngine($aes)
{
if ($aes->getEngine() != $this->engine) {
$engine = 'internal';
switch ($this->engine) {
case CRYPT_ENGINE_OPENSSL:
$engine = 'OpenSSL';
break;
case CRYPT_ENGINE_MCRYPT:
$engine = 'mcrypt';
}
self::markTestSkipped('Unable to initialize ' . $engine . ' engine');
}
}
/**
* Produces all combinations of test values.
*
* @return array
*/
public function continuousBufferCombos()
{
$modes = array(
'CRYPT_AES_MODE_CTR',
'CRYPT_AES_MODE_OFB',
'CRYPT_AES_MODE_CFB',
);
$plaintexts = array(
'',
'12345678901234567', // https://github.com/phpseclib/phpseclib/issues/39
"\xDE\xAD\xBE\xAF",
':-):-):-):-):-):-)', // https://github.com/phpseclib/phpseclib/pull/43
);
$ivs = array(
'',
'test123',
);
$keys = array(
'',
':-8', // https://github.com/phpseclib/phpseclib/pull/43
'FOOBARZ',
);
$result = array();
// @codingStandardsIgnoreStart
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foreach ($modes as $mode)
foreach ($plaintexts as $plaintext)
foreach ($ivs as $iv)
foreach ($keys as $key)
$result[] = array($mode, $plaintext, $iv, $key);
// @codingStandardsIgnoreEnd
return $result;
}
/**
* @dataProvider continuousBufferCombos
*/
public function testEncryptDecryptWithContinuousBuffer($mode, $plaintext, $iv, $key)
{
$aes = new Crypt_AES(constant($mode));
$aes->setPreferredEngine($this->engine);
$aes->enableContinuousBuffer();
$aes->setIV($iv);
$aes->setKey($key);
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$this->_checkEngine($aes);
$actual = '';
for ($i = 0, $strlen = strlen($plaintext); $i < $strlen; ++$i) {
$actual .= $aes->decrypt($aes->encrypt($plaintext[$i]));
}
$this->assertEquals($plaintext, $actual);
}
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/**
* @group github451
*/
public function testKeyPaddingRijndael()
{
// this test case is from the following URL:
// https://web.archive.org/web/20070209120224/http://fp.gladman.plus.com/cryptography_technology/rijndael/aesdvec.zip
$aes = new Crypt_Rijndael();
$aes->setPreferredEngine($this->engine);
$aes->disablePadding();
$aes->setKey(pack('H*', '2b7e151628aed2a6abf7158809cf4f3c762e7160')); // 160-bit key. Valid in Rijndael.
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//$this->_checkEngine($aes); // should only work in internal mode
$ciphertext = $aes->encrypt(pack('H*', '3243f6a8885a308d313198a2e0370734'));
$this->assertEquals($ciphertext, pack('H*', '231d844639b31b412211cfe93712b880'));
}
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/**
* @group github451
*/
public function testKeyPaddingAES()
{
// same as the above - just with a different ciphertext
$aes = new Crypt_AES();
$aes->setPreferredEngine($this->engine);
$aes->disablePadding();
$aes->setKey(pack('H*', '2b7e151628aed2a6abf7158809cf4f3c762e7160')); // 160-bit key. AES should null pad to 192-bits
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$this->_checkEngine($aes);
$ciphertext = $aes->encrypt(pack('H*', '3243f6a8885a308d313198a2e0370734'));
$this->assertEquals($ciphertext, pack('H*', 'c109292b173f841b88e0ee49f13db8c0'));
}
/**
* Produces all combinations of test values.
*
* @return array
*/
public function continuousBufferBatteryCombos()
{
$modes = array(
'CRYPT_MODE_CTR',
'CRYPT_MODE_OFB',
'CRYPT_MODE_CFB',
);
$combos = array(
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array(16),
array(17),
array(1, 16),
array(3, 6, 7), // (3 to test the openssl_encrypt call and the buffer creation, 6 to test the exclusive use of the buffer and 7 to test the buffer's exhaustion and recreation)
array(15, 4), // (15 to test openssl_encrypt call and buffer creation and 4 to test something that spans multpile bloc
array(3, 6, 10, 16), // this is why the strlen check in the buffer-only code was needed
array(16, 16), // two full size blocks
array(3, 6, 7, 16), // partial block + full size block
array(16, 3, 6, 7),
// a few others just for fun
array(32,32),
array(31,31),
array(17,17),
array(99, 99)
);
$result = array();
// @codingStandardsIgnoreStart
foreach ($modes as $mode)
foreach ($combos as $combo)
foreach (array('encrypt', 'decrypt') as $op)
$result[] = array($op, $mode, $combo);
// @codingStandardsIgnoreEnd
return $result;
}
/**
* @dataProvider continuousBufferBatteryCombos
*/
public function testContinuousBufferBattery($op, $mode, $test)
{
$iv = str_repeat('x', 16);
$key = str_repeat('a', 16);
$aes = new Crypt_AES(constant($mode));
$aes->setPreferredEngine($this->engine);
$aes->setKey($key);
$aes->setIV($iv);
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$this->_checkEngine($aes);
$str = '';
$result = '';
foreach ($test as $len) {
$temp = str_repeat('d', $len);
$str.= $temp;
}
$c1 = $aes->$op($str);
$aes = new Crypt_AES(constant($mode));
$aes->setPreferredEngine($this->engine);
$aes->enableContinuousBuffer();
$aes->setKey($key);
$aes->setIV($iv);
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$this->_checkEngine($aes);
foreach ($test as $len) {
$temp = str_repeat('d', $len);
$output = $aes->$op($temp);
$result.= $output;
}
$c2 = $result;
$this->assertSame(bin2hex($c1), bin2hex($c2));
}
/**
* @dataProvider continuousBufferBatteryCombos
*/
// pretty much the same as testContinuousBufferBattery with the caveat that continuous mode is not enabled
public function testNonContinuousBufferBattery($op, $mode, $test)
{
$iv = str_repeat('x', 16);
$key = str_repeat('a', 16);
$aes = new Crypt_AES(constant($mode));
$aes->setPreferredEngine($this->engine);
$aes->setKey($key);
$aes->setIV($iv);
$this->_checkEngine($aes);
$str = '';
$result = '';
foreach ($test as $len) {
$temp = str_repeat('d', $len);
$str.= $temp;
}
$c1 = $aes->$op($str);
$aes = new Crypt_AES(constant($mode));
$aes->setPreferredEngine($this->engine);
$aes->setKey($key);
$aes->setIV($iv);
$this->_checkEngine($aes);
foreach ($test as $len) {
$temp = str_repeat('d', $len);
$output = $aes->$op($temp);
$result.= $output;
}
$c2 = $result;
$this->assertNotSame(bin2hex($c1), bin2hex($c2));
}
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}