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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); } }