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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/core/crypto/chacha20_poly1305_decrypter.h"
#include <memory>
#include "net/quic/core/quic_utils.h"
#include "net/quic/platform/api/quic_text_utils.h"
#include "net/quic/test_tools/quic_test_utils.h"
using std::string;
namespace {
// The test vectors come from RFC 7539 Section 2.8.2.
// Each test vector consists of six 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 {
// Input:
const char* key;
const char* iv;
const char* fixed;
const char* aad;
const char* ct;
// Expected output:
const char* pt; // An empty string "" means decryption succeeded and
// the plaintext is zero-length. nullptr means decryption
// failed.
};
const TestVector test_vectors[] = {
{"808182838485868788898a8b8c8d8e8f"
"909192939495969798999a9b9c9d9e9f",
"4041424344454647",
"07000000",
"50515253c0c1c2c3c4c5c6c7",
"d31a8d34648e60db7b86afbc53ef7ec2"
"a4aded51296e08fea9e2b5a736ee62d6"
"3dbea45e8ca9671282fafb69da92728b"
"1a71de0a9e060b2905d6a5b67ecd3b36"
"92ddbd7f2d778b8c9803aee328091b58"
"fab324e4fad675945585808b4831d7bc"
"3ff4def08e4b7a9de576d26586cec64b"
"6116"
"1ae10b594f09e26a7e902ecb", // "d0600691" truncated
"4c616469657320616e642047656e746c"
"656d656e206f662074686520636c6173"
"73206f66202739393a20496620492063"
"6f756c64206f6666657220796f75206f"
"6e6c79206f6e652074697020666f7220"
"746865206675747572652c2073756e73"
"637265656e20776f756c642062652069"
"742e"},
// Modify the ciphertext (Poly1305 authenticator).
{"808182838485868788898a8b8c8d8e8f"
"909192939495969798999a9b9c9d9e9f",
"4041424344454647",
"07000000",
"50515253c0c1c2c3c4c5c6c7",
"d31a8d34648e60db7b86afbc53ef7ec2"
"a4aded51296e08fea9e2b5a736ee62d6"
"3dbea45e8ca9671282fafb69da92728b"
"1a71de0a9e060b2905d6a5b67ecd3b36"
"92ddbd7f2d778b8c9803aee328091b58"
"fab324e4fad675945585808b4831d7bc"
"3ff4def08e4b7a9de576d26586cec64b"
"6116"
"1ae10b594f09e26a7e902ecc", // "d0600691" truncated
nullptr},
// Modify the associated data.
{"808182838485868788898a8b8c8d8e8f"
"909192939495969798999a9b9c9d9e9f",
"4041424344454647",
"07000000",
"60515253c0c1c2c3c4c5c6c7",
"d31a8d34648e60db7b86afbc53ef7ec2"
"a4aded51296e08fea9e2b5a736ee62d6"
"3dbea45e8ca9671282fafb69da92728b"
"1a71de0a9e060b2905d6a5b67ecd3b36"
"92ddbd7f2d778b8c9803aee328091b58"
"fab324e4fad675945585808b4831d7bc"
"3ff4def08e4b7a9de576d26586cec64b"
"6116"
"1ae10b594f09e26a7e902ecb", // "d0600691" truncated
nullptr},
{nullptr}};
} // namespace
namespace net {
namespace test {
// DecryptWithNonce wraps the |Decrypt| method of |decrypter| to allow passing
// in an nonce and also to allocate the buffer needed for the plaintext.
QuicData* DecryptWithNonce(ChaCha20Poly1305Decrypter* decrypter,
QuicStringPiece nonce,
QuicStringPiece associated_data,
QuicStringPiece ciphertext) {
QuicPacketNumber packet_number;
QuicStringPiece nonce_prefix(nonce.data(),
nonce.size() - sizeof(packet_number));
decrypter->SetNoncePrefix(nonce_prefix);
memcpy(&packet_number, nonce.data() + nonce_prefix.size(),
sizeof(packet_number));
std::unique_ptr<char[]> output(new char[ciphertext.length()]);
size_t output_length = 0;
const bool success = decrypter->DecryptPacket(
QuicVersionMax(), packet_number, associated_data, ciphertext,
output.get(), &output_length, ciphertext.length());
if (!success) {
return nullptr;
}
return new QuicData(output.release(), output_length, true);
}
TEST(ChaCha20Poly1305DecrypterTest, Decrypt) {
for (size_t i = 0; test_vectors[i].key != nullptr; i++) {
// If not present then decryption is expected to fail.
bool has_pt = test_vectors[i].pt;
// Decode the test vector.
string key = QuicTextUtils::HexDecode(test_vectors[i].key);
string iv = QuicTextUtils::HexDecode(test_vectors[i].iv);
string fixed = QuicTextUtils::HexDecode(test_vectors[i].fixed);
string aad = QuicTextUtils::HexDecode(test_vectors[i].aad);
string ct = QuicTextUtils::HexDecode(test_vectors[i].ct);
string pt;
if (has_pt) {
pt = QuicTextUtils::HexDecode(test_vectors[i].pt);
}
ChaCha20Poly1305Decrypter decrypter;
ASSERT_TRUE(decrypter.SetKey(key));
std::unique_ptr<QuicData> decrypted(DecryptWithNonce(
&decrypter, fixed + iv,
// This deliberately tests that the decrypter can handle an AAD that
// is set to nullptr, as opposed to a zero-length, non-nullptr pointer.
QuicStringPiece(aad.length() ? aad.data() : nullptr, aad.length()),
ct));
if (!decrypted.get()) {
EXPECT_FALSE(has_pt);
continue;
}
EXPECT_TRUE(has_pt);
EXPECT_EQ(12u, ct.size() - decrypted->length());
ASSERT_EQ(pt.length(), decrypted->length());
test::CompareCharArraysWithHexError("plaintext", decrypted->data(),
pt.length(), pt.data(), pt.length());
}
}
} // namespace test
} // namespace net
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