<?php
namespace Defuse\Crypto;
use Defuse\Crypto\Exception as Ex;
/*
* We're using static class inheritance to get access to protected methods
* inside Crypto. To make it easy to know where the method we're calling can be
* found, within this file, prefix calls with `Crypto::` or `RuntimeTests::`,
* and don't use `self::`.
*/
class RuntimeTests extends Crypto
{
/**
* Runs the runtime tests.
*
* @throws Ex\EnvironmentIsBrokenException
* @return void
*/
public static function runtimeTest()
{
// 0: Tests haven't been run yet.
// 1: Tests have passed.
// 2: Tests are running right now.
// 3: Tests have failed.
static $test_state = 0;
if ($test_state === 1 || $test_state === 2) {
return;
}
if ($test_state === 3) {
/* If an intermittent problem caused a test to fail previously, we
* want that to be indicated to the user with every call to this
* library. This way, if the user first does something they really
* don't care about, and just ignores all exceptions, they won't get
* screwed when they then start to use the library for something
* they do care about. */
throw new Ex\EnvironmentIsBrokenException('Tests failed previously.');
}
try {
$test_state = 2;
Core::ensureFunctionExists('openssl_get_cipher_methods');
if (\in_array(Core::CIPHER_METHOD, \openssl_get_cipher_methods()) === false) {
throw new Ex\EnvironmentIsBrokenException(
'Cipher method not supported. This is normally caused by an outdated ' .
'version of OpenSSL (and/or OpenSSL compiled for FIPS compliance). ' .
'Please upgrade to a newer version of OpenSSL that supports ' .
Core::CIPHER_METHOD . ' to use this library.'
);
}
RuntimeTests::AESTestVector();
RuntimeTests::HMACTestVector();
RuntimeTests::HKDFTestVector();
RuntimeTests::testEncryptDecrypt();
Core::ensureTrue(Core::ourStrlen(Key::createNewRandomKey()->getRawBytes()) === Core::KEY_BYTE_SIZE);
Core::ensureTrue(Core::ENCRYPTION_INFO_STRING !== Core::AUTHENTICATION_INFO_STRING);
} catch (Ex\EnvironmentIsBrokenException $ex) {
// Do this, otherwise it will stay in the "tests are running" state.
$test_state = 3;
throw $ex;
}
// Change this to '0' make the tests always re-run (for benchmarking).
$test_state = 1;
}
/**
* High-level tests of Crypto operations.
*
* @throws Ex\EnvironmentIsBrokenException
* @return void
*/
private static function testEncryptDecrypt()
{
$key = Key::createNewRandomKey();
$data = "EnCrYpT EvErYThInG\x00\x00";
// Make sure encrypting then decrypting doesn't change the message.
$ciphertext = Crypto::encrypt($data, $key, true);
try {
$decrypted = Crypto::decrypt($ciphertext, $key, true);
} catch (Ex\WrongKeyOrModifiedCiphertextException $ex) {
// It's important to catch this and change it into a
// Ex\EnvironmentIsBrokenException, otherwise a test failure could trick
// the user into thinking it's just an invalid ciphertext!
throw new Ex\EnvironmentIsBrokenException();
}
Core::ensureTrue($decrypted === $data);
// Modifying the ciphertext: Appending a string.
try {
Crypto::decrypt($ciphertext . 'a', $key, true);
throw new Ex\EnvironmentIsBrokenException();
} catch (Ex\WrongKeyOrModifiedCiphertextException $e) { /* expected */
}
// Modifying the ciphertext: Changing an HMAC byte.
$indices_to_change = [
0, // The header.
Core::HEADER_VERSION_SIZE + 1, // the salt
Core::HEADER_VERSION_SIZE + Core::SALT_BYTE_SIZE + 1, // the IV
Core::HEADER_VERSION_SIZE + Core::SALT_BYTE_SIZE + Core::BLOCK_BYTE_SIZE + 1, // the ciphertext
];
foreach ($indices_to_change as $index) {
try {
$ciphertext[$index] = \chr((\ord($ciphertext[$index]) + 1) % 256);
Crypto::decrypt($ciphertext, $key, true);
throw new Ex\EnvironmentIsBrokenException();
} catch (Ex\WrongKeyOrModifiedCiphertextException $e) { /* expected */
}
}
// Decrypting with the wrong key.
$key = Key::createNewRandomKey();
$data = 'abcdef';
$ciphertext = Crypto::encrypt($data, $key, true);
$wrong_key = Key::createNewRandomKey();
try {
Crypto::decrypt($ciphertext, $wrong_key, true);
throw new Ex\EnvironmentIsBrokenException();
} catch (Ex\WrongKeyOrModifiedCiphertextException $e) { /* expected */
}
// Ciphertext too small.
$key = Key::createNewRandomKey();
$ciphertext = \str_repeat('A', Core::MINIMUM_CIPHERTEXT_SIZE - 1);
try {
Crypto::decrypt($ciphertext, $key, true);
throw new Ex\EnvironmentIsBrokenException();
} catch (Ex\WrongKeyOrModifiedCiphertextException $e) { /* expected */
}
}
/**
* Test HKDF against test vectors.
*
* @throws Ex\EnvironmentIsBrokenException
* @return void
*/
private static function HKDFTestVector()
{
// HKDF test vectors from RFC 5869
// Test Case 1
$ikm = \str_repeat("\x0b", 22);
$salt = Encoding::hexToBin('000102030405060708090a0b0c');
$info = Encoding::hexToBin('f0f1f2f3f4f5f6f7f8f9');
$length = 42;
$okm = Encoding::hexToBin(
'3cb25f25faacd57a90434f64d0362f2a' .
'2d2d0a90cf1a5a4c5db02d56ecc4c5bf' .
'34007208d5b887185865'
);
$computed_okm = Core::HKDF('sha256', $ikm, $length, $info, $salt);
Core::ensureTrue($computed_okm === $okm);
// Test Case 7
$ikm = \str_repeat("\x0c", 22);
$length = 42;
$okm = Encoding::hexToBin(
'2c91117204d745f3500d636a62f64f0a' .
'b3bae548aa53d423b0d1f27ebba6f5e5' .
'673a081d70cce7acfc48'
);
$computed_okm = Core::HKDF('sha1', $ikm, $length, '', null);
Core::ensureTrue($computed_okm === $okm);
}
/**
* Test HMAC against test vectors.
*
* @throws Ex\EnvironmentIsBrokenException
* @return void
*/
private static function HMACTestVector()
{
// HMAC test vector From RFC 4231 (Test Case 1)
$key = \str_repeat("\x0b", 20);
$data = 'Hi There';
$correct = 'b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7';
Core::ensureTrue(
\hash_hmac(Core::HASH_FUNCTION_NAME, $data, $key) === $correct
);
}
/**
* Test AES against test vectors.
*
* @throws Ex\EnvironmentIsBrokenException
* @return void
*/
private static function AESTestVector()
{
// AES CTR mode test vector from NIST SP 800-38A
$key = Encoding::hexToBin(
'603deb1015ca71be2b73aef0857d7781' .
'1f352c073b6108d72d9810a30914dff4'
);
$iv = Encoding::hexToBin('f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff');
$plaintext = Encoding::hexToBin(
'6bc1bee22e409f96e93d7e117393172a' .
'ae2d8a571e03ac9c9eb76fac45af8e51' .
'30c81c46a35ce411e5fbc1191a0a52ef' .
'f69f2445df4f9b17ad2b417be66c3710'
);
$ciphertext = Encoding::hexToBin(
'601ec313775789a5b7a7f504bbf3d228' .
'f443e3ca4d62b59aca84e990cacaf5c5' .
'2b0930daa23de94ce87017ba2d84988d' .
'dfc9c58db67aada613c2dd08457941a6'
);
$computed_ciphertext = Crypto::plainEncrypt($plaintext, $key, $iv);
Core::ensureTrue($computed_ciphertext === $ciphertext);
$computed_plaintext = Crypto::plainDecrypt($ciphertext, $key, $iv, Core::CIPHER_METHOD);
Core::ensureTrue($computed_plaintext === $plaintext);
}
}
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