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// Copyright (c) 2013 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 "quiche/quic/core/crypto/aes_128_gcm_12_decrypter.h"
#include <memory>
#include <string>
#include "absl/base/macros.h"
#include "absl/strings/escaping.h"
#include "absl/strings/string_view.h"
#include "quiche/quic/core/quic_utils.h"
#include "quiche/quic/platform/api/quic_test.h"
#include "quiche/quic/test_tools/quic_test_utils.h"
#include "quiche/common/test_tools/quiche_test_utils.h"
namespace {
// The AES GCM test vectors come from the file gcmDecrypt128.rsp
// downloaded from http://csrc.nist.gov/groups/STM/cavp/index.html on
// 2013-02-01. The test vectors in that file look like this:
//
// [Keylen = 128]
// [IVlen = 96]
// [PTlen = 0]
// [AADlen = 0]
// [Taglen = 128]
//
// Count = 0
// Key = cf063a34d4a9a76c2c86787d3f96db71
// IV = 113b9785971864c83b01c787
// CT =
// AAD =
// Tag = 72ac8493e3a5228b5d130a69d2510e42
// PT =
//
// Count = 1
// Key = a49a5e26a2f8cb63d05546c2a62f5343
// IV = 907763b19b9b4ab6bd4f0281
// CT =
// AAD =
// Tag = a2be08210d8c470a8df6e8fbd79ec5cf
// FAIL
//
// ...
//
// The gcmDecrypt128.rsp file is huge (2.6 MB), so I selected just a
// few test vectors for this unit test.
// Describes a group of test vectors that all have a given key length, IV
// length, plaintext length, AAD length, and tag length.
struct TestGroupInfo {
size_t key_len;
size_t iv_len;
size_t pt_len;
size_t aad_len;
size_t tag_len;
};
// 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* ct;
const char* aad;
const char* tag;
// Expected output:
const char* pt; // An empty string "" means decryption succeeded and
// the plaintext is zero-length. nullptr means decryption
// failed.
};
const TestGroupInfo test_group_info[] = {
{128, 96, 0, 0, 128}, {128, 96, 0, 128, 128}, {128, 96, 128, 0, 128},
{128, 96, 408, 160, 128}, {128, 96, 408, 720, 128}, {128, 96, 104, 0, 128},
};
const TestVector test_group_0[] = {
{"cf063a34d4a9a76c2c86787d3f96db71", "113b9785971864c83b01c787", "", "",
"72ac8493e3a5228b5d130a69d2510e42", ""},
{
"a49a5e26a2f8cb63d05546c2a62f5343", "907763b19b9b4ab6bd4f0281", "", "",
"a2be08210d8c470a8df6e8fbd79ec5cf",
nullptr // FAIL
},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr}};
const TestVector test_group_1[] = {
{
"d1f6af919cde85661208bdce0c27cb22", "898c6929b435017bf031c3c5", "",
"7c5faa40e636bbc91107e68010c92b9f", "ae45f11777540a2caeb128be8092468a",
nullptr // FAIL
},
{"2370e320d4344208e0ff5683f243b213", "04dbb82f044d30831c441228", "",
"d43a8e5089eea0d026c03a85178b27da", "2a049c049d25aa95969b451d93c31c6e",
""},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr}};
const TestVector test_group_2[] = {
{"e98b72a9881a84ca6b76e0f43e68647a", "8b23299fde174053f3d652ba",
"5a3c1cf1985dbb8bed818036fdd5ab42", "", "23c7ab0f952b7091cd324835043b5eb5",
"28286a321293253c3e0aa2704a278032"},
{"33240636cd3236165f1a553b773e728e", "17c4d61493ecdc8f31700b12",
"47bb7e23f7bdfe05a8091ac90e4f8b2e", "", "b723c70e931d9785f40fd4ab1d612dc9",
"95695a5b12f2870b9cc5fdc8f218a97d"},
{
"5164df856f1e9cac04a79b808dc5be39", "e76925d5355e0584ce871b2b",
"0216c899c88d6e32c958c7e553daa5bc", "",
"a145319896329c96df291f64efbe0e3a",
nullptr // FAIL
},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr}};
const TestVector test_group_3[] = {
{"af57f42c60c0fc5a09adb81ab86ca1c3", "a2dc01871f37025dc0fc9a79",
"b9a535864f48ea7b6b1367914978f9bfa087d854bb0e269bed8d279d2eea1210e48947"
"338b22f9bad09093276a331e9c79c7f4",
"41dc38988945fcb44faf2ef72d0061289ef8efd8",
"4f71e72bde0018f555c5adcce062e005",
"3803a0727eeb0ade441e0ec107161ded2d425ec0d102f21f51bf2cf9947c7ec4aa7279"
"5b2f69b041596e8817d0a3c16f8fadeb"},
{"ebc753e5422b377d3cb64b58ffa41b61", "2e1821efaced9acf1f241c9b",
"069567190554e9ab2b50a4e1fbf9c147340a5025fdbd201929834eaf6532325899ccb9"
"f401823e04b05817243d2142a3589878",
"b9673412fd4f88ba0e920f46dd6438ff791d8eef",
"534d9234d2351cf30e565de47baece0b",
"39077edb35e9c5a4b1e4c2a6b9bb1fce77f00f5023af40333d6d699014c2bcf4209c18"
"353a18017f5b36bfc00b1f6dcb7ed485"},
{
"52bdbbf9cf477f187ec010589cb39d58", "d3be36d3393134951d324b31",
"700188da144fa692cf46e4a8499510a53d90903c967f7f13e8a1bd8151a74adc4fe63e"
"32b992760b3a5f99e9a47838867000a9",
"93c4fc6a4135f54d640b0c976bf755a06a292c33",
"8ca4e38aa3dfa6b1d0297021ccf3ea5f",
nullptr // FAIL
},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr}};
const TestVector test_group_4[] = {
{"da2bb7d581493d692380c77105590201", "44aa3e7856ca279d2eb020c6",
"9290d430c9e89c37f0446dbd620c9a6b34b1274aeb6f911f75867efcf95b6feda69f1a"
"f4ee16c761b3c9aeac3da03aa9889c88",
"4cd171b23bddb3a53cdf959d5c1710b481eb3785a90eb20a2345ee00d0bb7868c367ab"
"12e6f4dd1dee72af4eee1d197777d1d6499cc541f34edbf45cda6ef90b3c024f9272d7"
"2ec1909fb8fba7db88a4d6f7d3d925980f9f9f72",
"9e3ac938d3eb0cadd6f5c9e35d22ba38",
"9bbf4c1a2742f6ac80cb4e8a052e4a8f4f07c43602361355b717381edf9fabd4cb7e3a"
"d65dbd1378b196ac270588dd0621f642"},
{"d74e4958717a9d5c0e235b76a926cae8", "0b7471141e0c70b1995fd7b1",
"e701c57d2330bf066f9ff8cf3ca4343cafe4894651cd199bdaaa681ba486b4a65c5a22"
"b0f1420be29ea547d42c713bc6af66aa",
"4a42b7aae8c245c6f1598a395316e4b8484dbd6e64648d5e302021b1d3fa0a38f46e22"
"bd9c8080b863dc0016482538a8562a4bd0ba84edbe2697c76fd039527ac179ec5506cf"
"34a6039312774cedebf4961f3978b14a26509f96",
"e192c23cb036f0b31592989119eed55d",
"840d9fb95e32559fb3602e48590280a172ca36d9b49ab69510f5bd552bfab7a306f85f"
"f0a34bc305b88b804c60b90add594a17"},
{
"1986310c725ac94ecfe6422e75fc3ee7", "93ec4214fa8e6dc4e3afc775",
"b178ec72f85a311ac4168f42a4b2c23113fbea4b85f4b9dabb74e143eb1b8b0a361e02"
"43edfd365b90d5b325950df0ada058f9",
"e80b88e62c49c958b5e0b8b54f532d9ff6aa84c8a40132e93e55b59fc24e8decf28463"
"139f155d1e8ce4ee76aaeefcd245baa0fc519f83a5fb9ad9aa40c4b21126013f576c42"
"72c2cb136c8fd091cc4539877a5d1e72d607f960",
"8b347853f11d75e81e8a95010be81f17",
nullptr // FAIL
},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr}};
const TestVector test_group_5[] = {
{"387218b246c1a8257748b56980e50c94", "dd7e014198672be39f95b69d",
"cdba9e73eaf3d38eceb2b04a8d", "", "ecf90f4a47c9c626d6fb2c765d201556",
"48f5b426baca03064554cc2b30"},
{"294de463721e359863887c820524b3d4", "3338b35c9d57a5d28190e8c9",
"2f46634e74b8e4c89812ac83b9", "", "dabd506764e68b82a7e720aa18da0abe",
"46a2e55c8e264df211bd112685"},
{"28ead7fd2179e0d12aa6d5d88c58c2dc", "5055347f18b4d5add0ae5c41",
"142d8210c3fb84774cdbd0447a", "", "5fd321d9cdb01952dc85f034736c2a7d",
"3b95b981086ee73cc4d0cc1422"},
{
"7d7b6c988137b8d470c57bf674a09c87", "9edf2aa970d016ac962e1fd8",
"a85b66c3cb5eab91d5bdc8bc0e", "", "dc054efc01f3afd21d9c2484819f569a",
nullptr // FAIL
},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr}};
const TestVector* const test_group_array[] = {
test_group_0, test_group_1, test_group_2,
test_group_3, test_group_4, test_group_5,
};
} // namespace
namespace quic {
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(Aes128Gcm12Decrypter* decrypter,
absl::string_view nonce,
absl::string_view associated_data,
absl::string_view ciphertext) {
uint64_t packet_number;
absl::string_view 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(
packet_number, associated_data, ciphertext, output.get(), &output_length,
ciphertext.length());
if (!success) {
return nullptr;
}
return new QuicData(output.release(), output_length, true);
}
class Aes128Gcm12DecrypterTest : public QuicTest {};
TEST_F(Aes128Gcm12DecrypterTest, Decrypt) {
for (size_t i = 0; i < ABSL_ARRAYSIZE(test_group_array); i++) {
SCOPED_TRACE(i);
const TestVector* test_vectors = test_group_array[i];
const TestGroupInfo& test_info = test_group_info[i];
for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
// If not present then decryption is expected to fail.
bool has_pt = test_vectors[j].pt;
// Decode the test vector.
std::string key = absl::HexStringToBytes(test_vectors[j].key);
std::string iv = absl::HexStringToBytes(test_vectors[j].iv);
std::string ct = absl::HexStringToBytes(test_vectors[j].ct);
std::string aad = absl::HexStringToBytes(test_vectors[j].aad);
std::string tag = absl::HexStringToBytes(test_vectors[j].tag);
std::string pt;
if (has_pt) {
pt = absl::HexStringToBytes(test_vectors[j].pt);
}
// The test vector's lengths should look sane. Note that the lengths
// in |test_info| are in bits.
EXPECT_EQ(test_info.key_len, key.length() * 8);
EXPECT_EQ(test_info.iv_len, iv.length() * 8);
EXPECT_EQ(test_info.pt_len, ct.length() * 8);
EXPECT_EQ(test_info.aad_len, aad.length() * 8);
EXPECT_EQ(test_info.tag_len, tag.length() * 8);
if (has_pt) {
EXPECT_EQ(test_info.pt_len, pt.length() * 8);
}
// The test vectors have 16 byte authenticators but this code only uses
// the first 12.
ASSERT_LE(static_cast<size_t>(Aes128Gcm12Decrypter::kAuthTagSize),
tag.length());
tag.resize(Aes128Gcm12Decrypter::kAuthTagSize);
std::string ciphertext = ct + tag;
Aes128Gcm12Decrypter decrypter;
ASSERT_TRUE(decrypter.SetKey(key));
std::unique_ptr<QuicData> decrypted(DecryptWithNonce(
&decrypter, 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.
aad.length() ? aad : absl::string_view(), ciphertext));
if (!decrypted) {
EXPECT_FALSE(has_pt);
continue;
}
EXPECT_TRUE(has_pt);
ASSERT_EQ(pt.length(), decrypted->length());
quiche::test::CompareCharArraysWithHexError(
"plaintext", decrypted->data(), pt.length(), pt.data(), pt.length());
}
}
}
} // namespace test
} // namespace quic