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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/crypto/chacha20_poly1305_rfc7539_encrypter.h"
#include <stdint.h>
#include "net/quic/crypto/chacha20_poly1305_rfc7539_decrypter.h"
#include "net/quic/test_tools/quic_test_utils.h"
using base::StringPiece;
using std::string;
namespace {
// The test vectors come from RFC 7539 Section 2.8.2.
// Each test vector consists of five strings of lowercase hexadecimal digits.
// The strings may be empty (zero length). A test vector with a nullptr |key|
// marks the end of an array of test vectors.
struct TestVector {
const char* key;
const char* pt;
const char* iv;
const char* fixed;
const char* aad;
const char* ct;
};
const TestVector test_vectors[] = {
{
"808182838485868788898a8b8c8d8e8f"
"909192939495969798999a9b9c9d9e9f",
"4c616469657320616e642047656e746c"
"656d656e206f662074686520636c6173"
"73206f66202739393a20496620492063"
"6f756c64206f6666657220796f75206f"
"6e6c79206f6e652074697020666f7220"
"746865206675747572652c2073756e73"
"637265656e20776f756c642062652069"
"742e",
"4041424344454647",
"07000000",
"50515253c0c1c2c3c4c5c6c7",
"d31a8d34648e60db7b86afbc53ef7ec2"
"a4aded51296e08fea9e2b5a736ee62d6"
"3dbea45e8ca9671282fafb69da92728b"
"1a71de0a9e060b2905d6a5b67ecd3b36"
"92ddbd7f2d778b8c9803aee328091b58"
"fab324e4fad675945585808b4831d7bc"
"3ff4def08e4b7a9de576d26586cec64b"
"6116"
"1ae10b594f09e26a7e902ecb", // "d0600691" truncated
},
{nullptr}};
} // namespace
namespace net {
namespace test {
// EncryptWithNonce wraps the |Encrypt| method of |encrypter| to allow passing
// in an nonce and also to allocate the buffer needed for the ciphertext.
QuicData* EncryptWithNonce(ChaCha20Poly1305Rfc7539Encrypter* encrypter,
StringPiece nonce,
StringPiece associated_data,
StringPiece plaintext) {
size_t ciphertext_size = encrypter->GetCiphertextSize(plaintext.length());
scoped_ptr<char[]> ciphertext(new char[ciphertext_size]);
if (!encrypter->Encrypt(nonce, associated_data, plaintext,
reinterpret_cast<unsigned char*>(ciphertext.get()))) {
return nullptr;
}
return new QuicData(ciphertext.release(), ciphertext_size, true);
}
TEST(ChaCha20Poly1305Rfc7539EncrypterTest, EncryptThenDecrypt) {
if (!ChaCha20Poly1305Rfc7539Encrypter::IsSupported()) {
VLOG(1) << "ChaCha20+Poly1305 not supported. Test skipped.";
return;
}
ChaCha20Poly1305Rfc7539Encrypter encrypter;
ChaCha20Poly1305Rfc7539Decrypter decrypter;
string key;
DecodeHexString(test_vectors[0].key, &key);
ASSERT_TRUE(encrypter.SetKey(key));
ASSERT_TRUE(decrypter.SetKey(key));
ASSERT_TRUE(encrypter.SetNoncePrefix("abcd"));
ASSERT_TRUE(decrypter.SetNoncePrefix("abcd"));
QuicPathId path_id = 0x42;
QuicPacketNumber packet_number = UINT64_C(0x123456789ABC);
string associated_data = "associated_data";
string plaintext = "plaintext";
char encrypted[1024];
size_t len;
ASSERT_TRUE(encrypter.EncryptPacket(path_id, packet_number, associated_data,
plaintext, encrypted, &len,
arraysize(encrypted)));
StringPiece ciphertext(encrypted, len);
char decrypted[1024];
ASSERT_TRUE(decrypter.DecryptPacket(path_id, packet_number, associated_data,
ciphertext, decrypted, &len,
arraysize(decrypted)));
}
TEST(ChaCha20Poly1305Rfc7539EncrypterTest, Encrypt) {
if (!ChaCha20Poly1305Rfc7539Encrypter::IsSupported()) {
VLOG(1) << "ChaCha20+Poly1305 not supported. Test skipped.";
return;
}
for (size_t i = 0; test_vectors[i].key != nullptr; i++) {
// Decode the test vector.
string key;
string pt;
string iv;
string fixed;
string aad;
string ct;
ASSERT_TRUE(DecodeHexString(test_vectors[i].key, &key));
ASSERT_TRUE(DecodeHexString(test_vectors[i].pt, &pt));
ASSERT_TRUE(DecodeHexString(test_vectors[i].iv, &iv));
ASSERT_TRUE(DecodeHexString(test_vectors[i].fixed, &fixed));
ASSERT_TRUE(DecodeHexString(test_vectors[i].aad, &aad));
ASSERT_TRUE(DecodeHexString(test_vectors[i].ct, &ct));
ChaCha20Poly1305Rfc7539Encrypter encrypter;
ASSERT_TRUE(encrypter.SetKey(key));
scoped_ptr<QuicData> encrypted(EncryptWithNonce(
&encrypter, fixed + iv,
// This deliberately tests that the encrypter can handle an AAD that
// is set to nullptr, as opposed to a zero-length, non-nullptr pointer.
StringPiece(aad.length() ? aad.data() : nullptr, aad.length()), pt));
ASSERT_TRUE(encrypted.get());
EXPECT_EQ(12u, ct.size() - pt.size());
EXPECT_EQ(12u, encrypted->length() - pt.size());
test::CompareCharArraysWithHexError("ciphertext", encrypted->data(),
encrypted->length(), ct.data(),
ct.length());
}
}
TEST(ChaCha20Poly1305Rfc7539EncrypterTest, GetMaxPlaintextSize) {
if (!ChaCha20Poly1305Rfc7539Encrypter::IsSupported()) {
VLOG(1) << "ChaCha20+Poly1305 not supported. Test skipped.";
return;
}
ChaCha20Poly1305Rfc7539Encrypter encrypter;
EXPECT_EQ(1000u, encrypter.GetMaxPlaintextSize(1012));
EXPECT_EQ(100u, encrypter.GetMaxPlaintextSize(112));
EXPECT_EQ(10u, encrypter.GetMaxPlaintextSize(22));
}
TEST(ChaCha20Poly1305Rfc7539EncrypterTest, GetCiphertextSize) {
if (!ChaCha20Poly1305Rfc7539Encrypter::IsSupported()) {
VLOG(1) << "ChaCha20+Poly1305 not supported. Test skipped.";
return;
}
ChaCha20Poly1305Rfc7539Encrypter encrypter;
EXPECT_EQ(1012u, encrypter.GetCiphertextSize(1000));
EXPECT_EQ(112u, encrypter.GetCiphertextSize(100));
EXPECT_EQ(22u, encrypter.GetCiphertextSize(10));
}
} // namespace test
} // namespace net
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