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TestSymmetricCipher.cpp
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/*
* Copyright (C) 2010 Felix Geyer <[email protected]>
* Copyright (C) 2017 KeePassXC Team <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 or (at your option)
* version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "TestSymmetricCipher.h"
#include "TestGlobal.h"
#include <QBuffer>
#include "crypto/Crypto.h"
#include "crypto/SymmetricCipher.h"
#include "streams/SymmetricCipherStream.h"
QTEST_GUILESS_MAIN(TestSymmetricCipher)
Q_DECLARE_METATYPE(SymmetricCipher::Mode);
Q_DECLARE_METATYPE(SymmetricCipher::Direction);
void TestSymmetricCipher::initTestCase()
{
QVERIFY(Crypto::init());
}
void TestSymmetricCipher::testCipherUuidToMode()
{
QCOMPARE(SymmetricCipher::cipherUuidToMode(KeePass2::CIPHER_AES128), SymmetricCipher::Aes128_CBC);
QCOMPARE(SymmetricCipher::cipherUuidToMode(KeePass2::CIPHER_AES256), SymmetricCipher::Aes256_CBC);
QCOMPARE(SymmetricCipher::cipherUuidToMode(KeePass2::CIPHER_TWOFISH), SymmetricCipher::Twofish_CBC);
QCOMPARE(SymmetricCipher::cipherUuidToMode(KeePass2::CIPHER_CHACHA20), SymmetricCipher::ChaCha20);
QCOMPARE(SymmetricCipher::cipherUuidToMode(QUuid()), SymmetricCipher::InvalidMode);
}
// clang-format off
void TestSymmetricCipher::testEncryptionDecryption_data()
{
QTest::addColumn<SymmetricCipher::Mode>("mode");
QTest::addColumn<SymmetricCipher::Direction>("direction");
QTest::addColumn<QByteArray>("key");
QTest::addColumn<QByteArray>("iv");
QTest::addColumn<QByteArray>("plainText");
QTest::addColumn<QByteArray>("cipherText");
// http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
QTest::newRow("AES128-CBC Encryption")
<< SymmetricCipher::Aes128_CBC
<< SymmetricCipher::Encrypt
<< QByteArray::fromHex("2b7e151628aed2a6abf7158809cf4f3c")
<< QByteArray::fromHex("000102030405060708090a0b0c0d0e0f")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a")
<< QByteArray::fromHex("7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b2");
QTest::newRow("AES128-CBC Decryption")
<< SymmetricCipher::Aes128_CBC
<< SymmetricCipher::Decrypt
<< QByteArray::fromHex("2b7e151628aed2a6abf7158809cf4f3c")
<< QByteArray::fromHex("000102030405060708090a0b0c0d0e0f")
<< QByteArray::fromHex("7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b2")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a");
QTest::newRow("AES256-CBC Encryption")
<< SymmetricCipher::Aes256_CBC
<< SymmetricCipher::Encrypt
<< QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4")
<< QByteArray::fromHex("000102030405060708090a0b0c0d0e0f")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a")
<< QByteArray::fromHex("f58c4c04d6e5f1ba779eabfb5f7bfbd69cfc4e967edb808d679f777bc6702c7d");
QTest::newRow("AES256-CBC Decryption")
<< SymmetricCipher::Aes256_CBC
<< SymmetricCipher::Decrypt
<< QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4")
<< QByteArray::fromHex("000102030405060708090a0b0c0d0e0f")
<< QByteArray::fromHex("f58c4c04d6e5f1ba779eabfb5f7bfbd69cfc4e967edb808d679f777bc6702c7d")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a");
QTest::newRow("AES256-CTR Encryption")
<< SymmetricCipher::Aes256_CTR
<< SymmetricCipher::Encrypt
<< QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4")
<< QByteArray::fromHex("f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a")
<< QByteArray::fromHex("601ec313775789a5b7a7f504bbf3d228f443e3ca4d62b59aca84e990cacaf5c5");
QTest::newRow("AES256-CTR Decryption")
<< SymmetricCipher::Aes256_CTR
<< SymmetricCipher::Decrypt
<< QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4")
<< QByteArray::fromHex("f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff")
<< QByteArray::fromHex("601ec313775789a5b7a7f504bbf3d228f443e3ca4d62b59aca84e990cacaf5c5")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a");
}
// clang-format on
void TestSymmetricCipher::testEncryptionDecryption()
{
QFETCH(SymmetricCipher::Mode, mode);
QFETCH(SymmetricCipher::Direction, direction);
QFETCH(QByteArray, key);
QFETCH(QByteArray, iv);
QFETCH(QByteArray, plainText);
QFETCH(QByteArray, cipherText);
QByteArray data = plainText;
SymmetricCipher cipher;
QVERIFY(cipher.init(mode, direction, key, iv));
QVERIFY(cipher.process(data));
QCOMPARE(data.left(16), cipherText.left(16));
QBuffer buffer;
buffer.open(QIODevice::WriteOnly);
SymmetricCipherStream stream(&buffer);
QVERIFY(stream.init(mode, direction, key, iv));
QVERIFY(stream.open(QIODevice::WriteOnly));
QCOMPARE(stream.write(plainText.left(16)), qint64(16));
stream.close();
QCOMPARE(buffer.data().left(16), cipherText.left(16));
}
void TestSymmetricCipher::testAesCbcPadding_data()
{
QTest::addColumn<SymmetricCipher::Mode>("mode");
QTest::addColumn<QByteArray>("key");
QTest::addColumn<QByteArray>("iv");
QTest::addColumn<QByteArray>("cipherText");
QTest::addColumn<QByteArray>("plainText");
QTest::addColumn<QByteArray>("padding");
// clang-format off
QTest::newRow("AES128") << SymmetricCipher::Aes128_CBC
<< QByteArray::fromHex("2b7e151628aed2a6abf7158809cf4f3c")
<< QByteArray::fromHex("000102030405060708090a0b0c0d0e0f")
<< QByteArray::fromHex("7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b2")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51")
<< QByteArray::fromHex("55e21d7100b988ffec32feeafaf23538");
QTest::newRow("AES256") << SymmetricCipher::Aes256_CBC
<< QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4")
<< QByteArray::fromHex("000102030405060708090a0b0c0d0e0f")
<< QByteArray::fromHex("f58c4c04d6e5f1ba779eabfb5f7bfbd69cfc4e967edb808d679f777bc6702c7d")
<< QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51")
<< QByteArray::fromHex("3a3aa5e0213db1a9901f9036cf5102d2");
// clang-format on
}
void TestSymmetricCipher::testAesCbcPadding()
{
QFETCH(SymmetricCipher::Mode, mode);
QFETCH(QByteArray, key);
QFETCH(QByteArray, iv);
QFETCH(QByteArray, cipherText);
QFETCH(QByteArray, plainText);
QFETCH(QByteArray, padding);
// padded with 16 0x10 bytes
QByteArray cipherTextPadded = cipherText + padding;
QBuffer buffer(&cipherTextPadded);
SymmetricCipherStream stream(&buffer);
QVERIFY(stream.init(mode, SymmetricCipher::Decrypt, key, iv));
buffer.open(QIODevice::ReadOnly);
QVERIFY(stream.open(QIODevice::ReadOnly));
QCOMPARE(stream.read(10), plainText.left(10));
buffer.reset();
QVERIFY(stream.reset());
QVERIFY(stream.init(mode, SymmetricCipher::Decrypt, key, iv));
QCOMPARE(stream.read(20), plainText.left(20));
buffer.reset();
QVERIFY(stream.reset());
QVERIFY(stream.init(mode, SymmetricCipher::Decrypt, key, iv));
QCOMPARE(stream.read(16), plainText.left(16));
buffer.reset();
QVERIFY(stream.reset());
QVERIFY(stream.init(mode, SymmetricCipher::Decrypt, key, iv));
QCOMPARE(stream.read(100), plainText);
}
void TestSymmetricCipher::testAesKdf()
{
auto key = QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4");
auto data = QByteArray::fromHex("6bc1bee22e409f96e93d7e117393172a");
auto result = QByteArray::fromHex("f3eed1bdb5d2a03c064b5a7e3db181f8");
QVERIFY(SymmetricCipher::aesKdf(key, 1, data));
QCOMPARE(data, result);
// TODO: Test multiple rounds of AES KDF
}
void TestSymmetricCipher::testTwofish256CbcEncryption()
{
// NIST MCT Known-Answer Tests (cbc_e_m.txt)
// https://www.schneier.com/code/twofish-kat.zip
QVector<QByteArray> keys{QByteArray::fromHex("0000000000000000000000000000000000000000000000000000000000000000"),
QByteArray::fromHex("D0A260EB41755B19374BABF259A79DB3EA7162E65490B03B1AE4871FB35EF23B"),
QByteArray::fromHex("8D55E4849A4DED08D89881E6708EDD26BEEE942073DFB3790B2798B240ACD74A"),
QByteArray::fromHex("606EFDC2066A837AF0430EBE4CF1F21071CCB236C33B4B9D82404FDB05C74621"),
QByteArray::fromHex("B119AA9485CEEEB4CC778AF21121E54DE4BDBA3498C61C8FD9004AA0C71909C3")};
QVector<QByteArray> ivs{QByteArray::fromHex("00000000000000000000000000000000"),
QByteArray::fromHex("EA7162E65490B03B1AE4871FB35EF23B"),
QByteArray::fromHex("549FF6C6274F034211C31FADF3F22571"),
QByteArray::fromHex("CF222616B0E4F8E48967D769456B916B"),
QByteArray::fromHex("957108025BFD57125B40057BC2DE4FE2")};
QVector<QByteArray> plainTexts{QByteArray::fromHex("00000000000000000000000000000000"),
QByteArray::fromHex("D0A260EB41755B19374BABF259A79DB3"),
QByteArray::fromHex("5DF7846FDB38B611EFD32A1429294095"),
QByteArray::fromHex("ED3B19469C276E7228DB8F583C7F2F36"),
QByteArray::fromHex("D177575683A46DCE3C34844C5DD0175D")};
QVector<QByteArray> cipherTexts{QByteArray::fromHex("EA7162E65490B03B1AE4871FB35EF23B"),
QByteArray::fromHex("549FF6C6274F034211C31FADF3F22571"),
QByteArray::fromHex("CF222616B0E4F8E48967D769456B916B"),
QByteArray::fromHex("957108025BFD57125B40057BC2DE4FE2"),
QByteArray::fromHex("6F725C5950133F82EF021A94CADC8508")};
SymmetricCipher cipher;
for (int i = 0; i < keys.size(); ++i) {
QVERIFY(cipher.init(SymmetricCipher::Twofish_CBC, SymmetricCipher::Encrypt, keys[i], ivs[i]));
QByteArray ptNext = plainTexts[i];
QByteArray ctPrev = ivs[i];
QByteArray ctCur;
QCOMPARE(cipher.blockSize(cipher.mode()), 16);
for (int j = 0; j < 5000; ++j) {
if (!cipher.process(ptNext)) {
break;
}
ctCur = ptNext;
ptNext = ctPrev;
ctPrev = ctCur;
if (!cipher.process(ptNext)) {
break;
}
ctCur = ptNext;
ptNext = ctPrev;
ctPrev = ctCur;
}
QCOMPARE(ctCur, cipherTexts[i]);
}
}
void TestSymmetricCipher::testTwofish256CbcDecryption()
{
// NIST MCT Known-Answer Tests (cbc_d_m.txt)
// https://www.schneier.com/code/twofish-kat.zip
QVector<QByteArray> keys{QByteArray::fromHex("0000000000000000000000000000000000000000000000000000000000000000"),
QByteArray::fromHex("1B1FE8F5A911CD4C0D800EDCE8ED0A942CBA6271A1044F90C30BA8FE91E1C163"),
QByteArray::fromHex("EBA31FF8D2A24FDD769A937353E23257294A33394E4D17A668060AD8230811A1"),
QByteArray::fromHex("1DCF1915C389AB273F80F897BF008F058ED89F58A95C1BE523C4B11295ED2D0F"),
QByteArray::fromHex("491B9A66D3ED4EF19F02180289D5B1A1C2596AE568540A95DC5244198A9B8869")};
QVector<QByteArray> ivs{QByteArray::fromHex("00000000000000000000000000000000"),
QByteArray::fromHex("1B1FE8F5A911CD4C0D800EDCE8ED0A94"),
QByteArray::fromHex("F0BCF70D7BB382917B1A9DAFBB0F38C3"),
QByteArray::fromHex("F66C06ED112BE4FA491A6BE4ECE2BD52"),
QByteArray::fromHex("54D483731064E5D6A082E09536D53EA4")};
QVector<QByteArray> plainTexts{QByteArray::fromHex("2CBA6271A1044F90C30BA8FE91E1C163"),
QByteArray::fromHex("05F05148EF495836AB0DA226B2E9D0C2"),
QByteArray::fromHex("A792AC61E7110C434BC2BBCAB6E53CAE"),
QByteArray::fromHex("4C81F5BDC1081170FF96F50B1F76A566"),
QByteArray::fromHex("BD959F5B787037631A37051EA5F369F8")};
QVector<QByteArray> cipherTexts{QByteArray::fromHex("00000000000000000000000000000000"),
QByteArray::fromHex("2CBA6271A1044F90C30BA8FE91E1C163"),
QByteArray::fromHex("05F05148EF495836AB0DA226B2E9D0C2"),
QByteArray::fromHex("A792AC61E7110C434BC2BBCAB6E53CAE"),
QByteArray::fromHex("4C81F5BDC1081170FF96F50B1F76A566")};
SymmetricCipher cipher;
for (int i = 0; i < keys.size(); ++i) {
QVERIFY(cipher.init(SymmetricCipher::Twofish_CBC, SymmetricCipher::Decrypt, keys[i], ivs[i]));
QByteArray ctNext = cipherTexts[i];
QByteArray ptCur;
QCOMPARE(cipher.blockSize(cipher.mode()), 16);
for (int j = 0; j < 5000; ++j) {
if (!cipher.process(ctNext)) {
break;
}
if (!cipher.process(ctNext)) {
break;
}
}
QCOMPARE(ctNext, plainTexts[i]);
}
}
void TestSymmetricCipher::testSalsa20()
{
// http://www.ecrypt.eu.org/stream/svn/viewcvs.cgi/ecrypt/trunk/submissions/salsa20/full/verified.test-vectors?logsort=rev&rev=210&view=markup
QByteArray key = QByteArray::fromHex("F3F4F5F6F7F8F9FAFBFCFDFEFF000102030405060708090A0B0C0D0E0F101112");
QByteArray iv = QByteArray::fromHex("0000000000000000");
SymmetricCipher cipher;
QVERIFY(cipher.init(SymmetricCipher::Salsa20, SymmetricCipher::Encrypt, key, iv));
QByteArray cipherTextA;
for (int i = 0; i < 8; i++) {
QByteArray data(64, '\0');
QVERIFY(cipher.process(data));
cipherTextA.append(data);
}
// Re-initialize
QVERIFY(cipher.init(SymmetricCipher::Salsa20, SymmetricCipher::Encrypt, key, iv));
QByteArray cipherTextB(512, '\0');
QVERIFY(cipher.process(cipherTextB));
cipher.reset();
QByteArray expectedCipherText1;
expectedCipherText1.append(QByteArray::fromHex("B4C0AFA503BE7FC29A62058166D56F8F"));
expectedCipherText1.append(QByteArray::fromHex("5D27DC246F75B9AD8760C8C39DFD8749"));
expectedCipherText1.append(QByteArray::fromHex("2D3B76D5D9637F009EADA14458A52DFB"));
expectedCipherText1.append(QByteArray::fromHex("09815337E72672681DDDC24633750D83"));
QByteArray expectedCipherText2;
expectedCipherText2.append(QByteArray::fromHex("DBBA0683DF48C335A9802EEF02522563"));
expectedCipherText2.append(QByteArray::fromHex("54C9F763C3FDE19131A6BB7B85040624"));
expectedCipherText2.append(QByteArray::fromHex("B1D6CD4BF66D16F7482236C8602A6D58"));
expectedCipherText2.append(QByteArray::fromHex("505EEDCCA0B77AED574AB583115124B9"));
QByteArray expectedCipherText3;
expectedCipherText3.append(QByteArray::fromHex("F0C5F98BAE05E019764EF6B65E0694A9"));
expectedCipherText3.append(QByteArray::fromHex("04CB9EC9C10C297B1AB1A6052365BB78"));
expectedCipherText3.append(QByteArray::fromHex("E55D3C6CB9F06184BA7D425A92E7E987"));
expectedCipherText3.append(QByteArray::fromHex("757FC5D9AFD7082418DD64125CA6F2B6"));
QByteArray expectedCipherText4;
expectedCipherText4.append(QByteArray::fromHex("5A5FB5C8F0AFEA471F0318A4A2792F7A"));
expectedCipherText4.append(QByteArray::fromHex("A5C67B6D6E0F0DDB79961C34E3A564BA"));
expectedCipherText4.append(QByteArray::fromHex("2EECE78D9AFF45E510FEAB1030B102D3"));
expectedCipherText4.append(QByteArray::fromHex("9DFCECB77F5798F7D2793C0AB09C7A04"));
QCOMPARE(cipherTextA.mid(0, 64), expectedCipherText1);
QCOMPARE(cipherTextA.mid(192, 64), expectedCipherText2);
QCOMPARE(cipherTextA.mid(256, 64), expectedCipherText3);
QCOMPARE(cipherTextA.mid(448, 64), expectedCipherText4);
QCOMPARE(cipherTextB.mid(0, 64), expectedCipherText1);
QCOMPARE(cipherTextB.mid(192, 64), expectedCipherText2);
QCOMPARE(cipherTextB.mid(256, 64), expectedCipherText3);
QCOMPARE(cipherTextB.mid(448, 64), expectedCipherText4);
}
void TestSymmetricCipher::testChaCha20()
{
// https://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04#section-7
{
QByteArray key = QByteArray::fromHex("0000000000000000000000000000000000000000000000000000000000000000");
QByteArray iv = QByteArray::fromHex("0000000000000000");
SymmetricCipher cipher;
QByteArray data(64, 0);
QVERIFY(cipher.init(SymmetricCipher::ChaCha20, SymmetricCipher::Encrypt, key, iv));
QVERIFY(cipher.process(data));
QCOMPARE(data,
QByteArray::fromHex("76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7"
"724e03fb8d84a376a43b8f41518a11cc387b669b2ee6586"));
}
{
QByteArray key = QByteArray::fromHex("0000000000000000000000000000000000000000000000000000000000000001");
QByteArray iv = QByteArray::fromHex("0000000000000000");
SymmetricCipher cipher;
QByteArray data(64, 0);
QVERIFY(cipher.init(SymmetricCipher::ChaCha20, SymmetricCipher::Encrypt, key, iv));
QVERIFY(cipher.process(data));
QCOMPARE(data,
QByteArray::fromHex("4540f05a9f1fb296d7736e7b208e3c96eb4fe1834688d2604f450952ed432d41bbe2a0b6ea7566d2a"
"5d1e7e20d42af2c53d792b1c43fea817e9ad275ae546963"));
}
{
QByteArray key = QByteArray::fromHex("0000000000000000000000000000000000000000000000000000000000000000");
QByteArray iv = QByteArray::fromHex("0000000000000001");
SymmetricCipher cipher;
QByteArray data(60, 0);
QVERIFY(cipher.init(SymmetricCipher::ChaCha20, SymmetricCipher::Encrypt, key, iv));
QVERIFY(cipher.process(data));
QCOMPARE(data,
QByteArray::fromHex("de9cba7bf3d69ef5e786dc63973f653a0b49e015adbff7134fcb7df137821031e85a050278a708452"
"7214f73efc7fa5b5277062eb7a0433e445f41e3"));
}
{
QByteArray key = QByteArray::fromHex("0000000000000000000000000000000000000000000000000000000000000000");
QByteArray iv = QByteArray::fromHex("0100000000000000");
SymmetricCipher cipher;
QByteArray data(64, 0);
QVERIFY(cipher.init(SymmetricCipher::ChaCha20, SymmetricCipher::Encrypt, key, iv));
QVERIFY(cipher.process(data));
QCOMPARE(data,
QByteArray::fromHex("ef3fdfd6c61578fbf5cf35bd3dd33b8009631634d21e42ac33960bd138e50d32111e4caf237ee53ca"
"8ad6426194a88545ddc497a0b466e7d6bbdb0041b2f586b"));
}
}
void TestSymmetricCipher::testPadding()
{
QByteArray key = QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4");
QByteArray iv = QByteArray::fromHex("000102030405060708090a0b0c0d0e0f");
QByteArray plainText = QByteArray::fromHex("6bc1bee22e409f96e93d");
QBuffer buffer;
buffer.open(QIODevice::ReadWrite);
SymmetricCipherStream streamEnc(&buffer);
QVERIFY(streamEnc.init(SymmetricCipher::Aes256_CBC, SymmetricCipher::Encrypt, key, iv));
streamEnc.open(QIODevice::WriteOnly);
streamEnc.write(plainText);
streamEnc.close();
buffer.reset();
// make sure padding is written
QCOMPARE(buffer.buffer().size(), 16);
SymmetricCipherStream streamDec(&buffer);
QVERIFY(streamDec.init(SymmetricCipher::Aes256_CBC, SymmetricCipher::Decrypt, key, iv));
streamDec.open(QIODevice::ReadOnly);
QByteArray decrypted = streamDec.readAll();
QCOMPARE(decrypted, plainText);
}
void TestSymmetricCipher::testStreamReset()
{
QByteArray key = QByteArray::fromHex("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4");
QByteArray iv = QByteArray::fromHex("000102030405060708090a0b0c0d0e0f");
QBuffer buffer;
QVERIFY(buffer.open(QIODevice::WriteOnly));
SymmetricCipherStream writer(&buffer);
QVERIFY(writer.init(SymmetricCipher::Aes256_CBC, SymmetricCipher::Encrypt, key, iv));
QVERIFY(writer.open(QIODevice::WriteOnly));
QCOMPARE(writer.write(QByteArray(4, 'Z')), qint64(4));
// test if reset() and close() write only one block
QVERIFY(writer.reset());
QVERIFY(writer.reset());
writer.close();
QCOMPARE(buffer.buffer().size(), 16);
}