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69ffc1aa85
monero/tests/unit_tests/lmdb.cpp
jeffro256 b0bf49a65a
blockchain_db: add k-anonymity to txid fetching 
Read more about k-anonymity [here](https://en.wikipedia.org/wiki/K-anonymity). We implement this feature in the monero daemon for transactions
by providing a "Txid Template", which is simply a txid with all but `num_matching_bits` bits zeroed out, and the number `num_matching_bits`. We add an operation to `BlockchainLMDB` called
`get_txids_loose` which takes a txid template and returns all txids in the database (chain and mempool) that satisfy that template. Thus, a client can
ask about a specific transaction from a daemon without revealing the exact transaction they are inquiring about. The client can control the statistical
chance that other TXIDs (besides the one in question) match the txid template sent to the daemon up to a power of 2. For example, if a client sets their `num_matching_bits`
to 5, then statistically any txid has a 1/(2^5) chance to match. With `num_matching_bits`=10, there is a 1/(2^10) chance, so on and so forth.

Co-authored-by: ACK-J <60232273+ACK-J@users.noreply.github.com>
2023-08-01 17:25:25 -05:00

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// Copyright (c) 2014-2023, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <boost/range/algorithm_ext/iota.hpp>
#include <boost/range/algorithm/equal.hpp>
#include <gtest/gtest.h>
#include "blockchain_db/lmdb/db_lmdb.h"
#include "cryptonote_basic/cryptonote_basic_impl.h"
#include "hex.h"
#include "lmdb/database.h"
#include "lmdb/table.h"
#include "lmdb/transaction.h"
#include "lmdb/util.h"
#include "string_tools.h"
namespace
{
enum class choice : unsigned {};
enum class big_choice : unsigned long {};
struct bytes {
char data[16];
};
MONERO_CURSOR(test_cursor);
template<typename T>
int run_compare(T left, T right, MDB_cmp_func* cmp)
{
MDB_val left_val = lmdb::to_val(left);
MDB_val right_val = lmdb::to_val(right);
return (*cmp)(&left_val, &right_val);
}
crypto::hash postfix_hex_to_hash(const std::string& hex)
{
if (hex.size() > 64) throw std::logic_error("postfix_hex_to_hash");
std::string decoded_bytes;
if (!epee::from_hex::to_string(decoded_bytes, hex)) throw std::logic_error("postfix_hex_to_hash");
crypto::hash res = crypto::null_hash;
memcpy(res.data + 32 - decoded_bytes.size(), decoded_bytes.data(), decoded_bytes.size());
return res;
}
void test_make_template(const std::string& input_hex, unsigned int nbits, const std::string& expected_hex)
{
const crypto::hash input = postfix_hex_to_hash(input_hex);
const crypto::hash expected = postfix_hex_to_hash(expected_hex);
const crypto::hash actual = cryptonote::make_hash32_loose_template(nbits, input);
ASSERT_EQ(expected, actual);
}
}
TEST(LMDB, Traits)
{
EXPECT_TRUE((std::is_same<void, lmdb::identity<void>::type>()));
EXPECT_TRUE((std::is_same<unsigned, lmdb::identity<unsigned>::type>()));
EXPECT_TRUE((std::is_same<void, lmdb::native_type<void>>()));
EXPECT_TRUE((std::is_same<unsigned, lmdb::native_type<unsigned>>()));
EXPECT_TRUE((std::is_same<unsigned, lmdb::native_type<choice>>()));
EXPECT_TRUE((std::is_same<unsigned long, lmdb::native_type<big_choice>>()));
}
TEST(LMDB, ToNative)
{
enum class negative_choice : int {};
EXPECT_TRUE((std::is_same<unsigned, decltype(lmdb::to_native(choice(0)))>()));
EXPECT_TRUE(
(std::is_same<unsigned long, decltype(lmdb::to_native(big_choice(0)))>())
);
EXPECT_TRUE(
(std::is_same<int, decltype(lmdb::to_native(negative_choice(0)))>())
);
EXPECT_EQ(unsigned(0), lmdb::to_native(choice(0)));
EXPECT_EQ(unsigned(0xffffffff), lmdb::to_native(choice(0xffffffff)));
EXPECT_EQ(-1, lmdb::to_native(negative_choice(-1)));
// test constexpr
static_assert(100 == lmdb::to_native(choice(100)), "to_native failed");
static_assert(-100 == lmdb::to_native(negative_choice(-100)), "to_native failed");
}
TEST(LMDB, Conversions)
{
struct one
{
big_choice i;
choice j;
};
const one test{big_choice(100), choice(95)};
one test2{big_choice(1000), choice(950)};
EXPECT_EQ(&test, lmdb::to_val(test).mv_data);
EXPECT_NE(&test2, lmdb::to_val(test).mv_data);
EXPECT_EQ(
&test,
static_cast<const void*>(lmdb::to_byte_span(lmdb::to_val(test)).begin())
);
EXPECT_EQ(sizeof(test), lmdb::to_val(test).mv_size);
EXPECT_EQ(sizeof(test), lmdb::to_byte_span(lmdb::to_val(test)).size());
EXPECT_EQ(&test2, lmdb::to_val(test2).mv_data);
EXPECT_NE(&test, lmdb::to_val(test2).mv_data);
EXPECT_EQ(
&test2,
static_cast<const void*>(lmdb::to_byte_span(lmdb::to_val(test2)).begin())
);
EXPECT_EQ(sizeof(test2), lmdb::to_val(test2).mv_size);
EXPECT_EQ(sizeof(test2), lmdb::to_byte_span(lmdb::to_val(test2)).size());
}
TEST(LMDB, LessSort)
{
struct one
{
unsigned i;
unsigned j;
};
struct two
{
unsigned i;
choice j;
};
EXPECT_EQ(0, run_compare(0u, 0u, &lmdb::less<unsigned>));
EXPECT_EQ(-1, run_compare(0u, 1u, &lmdb::less<unsigned>));
EXPECT_EQ(1, run_compare(1u, 0u, &lmdb::less<unsigned>));
EXPECT_EQ(0, run_compare<one>({0, 1}, {0, 1}, &lmdb::less<unsigned, sizeof(unsigned)>));
EXPECT_EQ(-1, run_compare<one>({0, 0}, {0, 1}, &lmdb::less<unsigned, sizeof(unsigned)>));
EXPECT_EQ(1, run_compare<one>({0, 1}, {0, 0}, &lmdb::less<unsigned, sizeof(unsigned)>));
EXPECT_EQ(0, run_compare<one>({0, 1}, {0, 1}, MONERO_SORT_BY(one, j)));
EXPECT_EQ(-1, run_compare<one>({0, 0}, {0, 1}, MONERO_SORT_BY(one, j)));
EXPECT_EQ(1, run_compare<one>({0, 1}, {0, 0}, MONERO_SORT_BY(one, j)));
EXPECT_EQ(0, run_compare<two>({0, choice(1)}, {0, choice(1)}, MONERO_SORT_BY(two, j)));
EXPECT_EQ(-1, run_compare<two>({0, choice(0)}, {0, choice(1)}, MONERO_SORT_BY(two, j)));
EXPECT_EQ(1, run_compare<two>({0, choice(1)}, {0, choice(0)}, MONERO_SORT_BY(two, j)));
// compare function addresses
EXPECT_EQ((MONERO_SORT_BY(one, i)), (MONERO_SORT_BY(two, i)));
EXPECT_EQ((MONERO_SORT_BY(one, j)), (MONERO_SORT_BY(two, j)));
EXPECT_NE((MONERO_SORT_BY(one, i)), (MONERO_SORT_BY(two, j)));
EXPECT_NE((MONERO_SORT_BY(one, j)), (MONERO_SORT_BY(two, i)));
}
TEST(LMDB, SortCompare)
{
struct one
{
unsigned i;
bytes j;
};
one test{55};
boost::iota(test.j.data, 10);
const one test2 = test;
EXPECT_EQ(0, run_compare(test, test2, MONERO_COMPARE(one, j)));
test.j.data[15] = 1;
EXPECT_GT(0, run_compare(test, test2, MONERO_COMPARE(one, j)));
test.j.data[15] = 100;
EXPECT_LT(0, run_compare(test, test2, MONERO_COMPARE(one, j)));
}
TEST(LMDB, Table)
{
struct one
{
bytes i;
bytes j;
};
constexpr lmdb::basic_table<choice, bytes> test{"foo"};
EXPECT_STREQ("foo", test.name);
static_assert(test.flags == 0, "bad flags");
static_assert(&lmdb::less<unsigned> == test.key_cmp, "bad key_cmp");
static_assert(test.value_cmp == nullptr, "bad value_cmp");
EXPECT_TRUE(test.get_value<bytes>(MDB_val{}).matches(std::errc::invalid_argument));
lmdb::basic_table<big_choice, one> test2{
"foo2", MDB_DUPSORT, &lmdb::compare<one>
};
EXPECT_STREQ("foo2", test2.name);
EXPECT_EQ((MDB_DUPSORT | MDB_DUPFIXED), test2.flags);
EXPECT_EQ(&lmdb::less<unsigned long>, test2.key_cmp);
EXPECT_EQ(&lmdb::compare<one>, test2.value_cmp);
EXPECT_TRUE(test2.get_value<one>(MDB_val{}).matches(std::errc::invalid_argument));
one record{};
boost::iota(record.i.data, 0);
boost::iota(record.i.data, 20);
const one record_copy = MONERO_UNWRAP(test2.get_value<one>(lmdb::to_val(record)));
EXPECT_TRUE(boost::equal(record.i.data, record_copy.i.data));
EXPECT_TRUE(boost::equal(record.j.data, record_copy.j.data));
const bytes j_copy = MONERO_UNWRAP(
test2.get_value<MONERO_FIELD(one, j)>(lmdb::to_val(record))
);
EXPECT_TRUE(boost::equal(record.j.data, j_copy.data));
EXPECT_TRUE(
test.get_key_stream(test_cursor{}).matches(std::errc::invalid_argument)
);
EXPECT_TRUE(
test2.get_key_stream(test_cursor{}).matches(std::errc::invalid_argument)
);
EXPECT_TRUE(
test.get_value_stream(choice(0), test_cursor{}).matches(std::errc::invalid_argument)
);
EXPECT_TRUE(
test2.get_value_stream(big_choice(0), test_cursor{}).matches(std::errc::invalid_argument)
);
}
TEST(LMDB, InvalidDatabase)
{
lmdb::database test{lmdb::environment{}};
EXPECT_TRUE(test.resize().matches(std::errc::invalid_argument));
EXPECT_TRUE(test.create_read_txn().matches(std::errc::invalid_argument));
EXPECT_TRUE(test.reset_txn(lmdb::read_txn{}).matches(std::errc::invalid_argument));
EXPECT_TRUE(test.create_write_txn().matches(std::errc::invalid_argument));
EXPECT_TRUE(test.commit(lmdb::write_txn{}).matches(std::errc::invalid_argument));
EXPECT_TRUE(
test.try_write( [](MDB_txn&) { return success(); } ).matches(std::errc::invalid_argument)
);
}
TEST(LMDB, InvalidValueStream)
{
struct one
{
choice i;
choice j;
bytes k;
};
lmdb::value_stream<one, close_test_cursor> test{test_cursor{}};
EXPECT_TRUE((std::is_same<one, decltype(*(test.make_iterator()))>()));
EXPECT_TRUE((std::is_same<one, decltype(*(test.make_range().begin()))>()));
EXPECT_TRUE(
(std::is_same<bytes, decltype(*(test.make_iterator<MONERO_FIELD(one, k)>()))>())
);
EXPECT_TRUE(
(std::is_same<bytes, decltype(*(test.make_range<MONERO_FIELD(one, k)>().begin()))>())
);
EXPECT_NO_THROW(test.reset());
EXPECT_EQ(0u, test.count());
EXPECT_TRUE(test.make_iterator().is_end());
EXPECT_TRUE(test.make_range().empty());
EXPECT_EQ(nullptr, test.give_cursor());
EXPECT_EQ(0u, test.count());
EXPECT_TRUE(test.make_iterator().is_end());
EXPECT_TRUE(test.make_range().empty());
EXPECT_EQ(nullptr, test.give_cursor());
}
TEST(LMDB, InvalidValueIterator)
{
struct one
{
choice i;
choice j;
bytes k;
};
lmdb::value_iterator<one> test1{};
EXPECT_TRUE((std::is_same<one, decltype(*test1)>()));
EXPECT_TRUE(
(std::is_same<bytes, decltype(test1.get_value<MONERO_FIELD(one, k)>())>())
);
EXPECT_TRUE(test1.is_end());
EXPECT_NO_THROW(++test1);
EXPECT_NO_THROW(test1++);
EXPECT_TRUE(test1.is_end());
lmdb::value_iterator<one> test2{nullptr};
EXPECT_TRUE(test2.is_end());
EXPECT_NO_THROW(++test2);
EXPECT_NO_THROW(test2++);
EXPECT_TRUE(test2.is_end());
EXPECT_TRUE(test1.equal(test2));
EXPECT_TRUE(test2.equal(test1));
EXPECT_TRUE(test1 == test2);
EXPECT_TRUE(test2 == test1);
EXPECT_FALSE(test1 != test2);
EXPECT_FALSE(test2 != test1);
lmdb::value_iterator<MONERO_FIELD(one, k)> test3{};
EXPECT_TRUE((std::is_same<bytes, decltype(*test3)>()));
EXPECT_TRUE((std::is_same<one, decltype(test3.get_value<one>())>()));
EXPECT_TRUE(
(std::is_same<choice, decltype(test1.get_value<MONERO_FIELD(one, j)>())>())
);
EXPECT_TRUE(test3.is_end());
EXPECT_NO_THROW(++test3);
EXPECT_NO_THROW(test3++);
EXPECT_TRUE(test3.is_end());
}
TEST(LMDB, InvalidKeyStream)
{
struct one
{
choice i;
choice j;
bytes k;
};
using record = std::pair<choice, boost::iterator_range<lmdb::value_iterator<one>>>;
lmdb::key_stream<choice, one, close_test_cursor> test{test_cursor{}};
EXPECT_TRUE((std::is_same<record, decltype(*(test.make_iterator()))>()));
EXPECT_TRUE((std::is_same<record, decltype(*(test.make_range().begin()))>()));
EXPECT_NO_THROW(test.reset());
EXPECT_TRUE(test.make_iterator().is_end());
EXPECT_TRUE(test.make_range().empty());
EXPECT_EQ(nullptr, test.give_cursor());
EXPECT_TRUE(test.make_iterator().is_end());
EXPECT_TRUE(test.make_range().empty());
EXPECT_EQ(nullptr, test.give_cursor());
}
TEST(LMDB, InvalidKeyIterator)
{
struct one
{
choice i;
choice j;
bytes k;
};
using record = std::pair<choice, boost::iterator_range<lmdb::value_iterator<one>>>;
lmdb::key_iterator<choice, one> test1{};
EXPECT_TRUE((std::is_same<record, decltype(*test1)>()));
EXPECT_TRUE((std::is_same<choice, decltype(test1.get_key())>()));
EXPECT_TRUE((std::is_same<one, decltype(*(test1.make_value_iterator()))>()));
EXPECT_TRUE((std::is_same<one, decltype(*(test1.make_value_range().begin()))>()));
EXPECT_TRUE(
(std::is_same<bytes, decltype(*(test1.make_value_iterator<MONERO_FIELD(one, k)>()))>())
);
EXPECT_TRUE(
(std::is_same<bytes, decltype(*(test1.make_value_range<MONERO_FIELD(one, k)>().begin()))>())
);
EXPECT_TRUE(test1.is_end());
EXPECT_NO_THROW(++test1);
EXPECT_NO_THROW(test1++);
EXPECT_TRUE(test1.is_end());
EXPECT_TRUE(test1.make_value_iterator().is_end());
EXPECT_TRUE(test1.make_value_range().empty());
lmdb::key_iterator<choice, one> test2{nullptr};
EXPECT_TRUE(test2.is_end());
EXPECT_NO_THROW(++test2);
EXPECT_NO_THROW(test2++);
EXPECT_TRUE(test2.is_end());
EXPECT_TRUE(test2.make_value_iterator().is_end());
EXPECT_TRUE(test2.make_value_range().empty());
EXPECT_TRUE(test1.equal(test2));
EXPECT_TRUE(test2.equal(test1));
EXPECT_TRUE(test1 == test2);
EXPECT_TRUE(test2 == test1);
EXPECT_FALSE(test1 != test2);
EXPECT_FALSE(test2 != test1);
}
TEST(LMDB_kanonymity, compare_hash32_reversed_nbits)
{
static constexpr size_t NUM_RANDOM_HASHES = 128;
std::vector<crypto::hash> random_hashes;
random_hashes.reserve(500);
for (size_t i = 0; i < NUM_RANDOM_HASHES; ++i)
random_hashes.push_back(crypto::rand<crypto::hash>());
bool r = true;
// Compare behavior of compare_hash32_reversed_nbits(nbits=256) to BlockchainLMDB::compare_hash32
for (size_t i = 0; i < NUM_RANDOM_HASHES; ++i)
{
for (size_t j = 0; j < NUM_RANDOM_HASHES; ++j)
{
const crypto::hash& ha = random_hashes[i];
const crypto::hash& hb = random_hashes[j];
const MDB_val mva = {sizeof(crypto::hash), (void*)(&ha)};
const MDB_val mvb = {sizeof(crypto::hash), (void*)(&hb)};
const int expected = cryptonote::BlockchainLMDB::compare_hash32(&mva, &mvb);
const int actual = cryptonote::compare_hash32_reversed_nbits(ha, hb, 256);
if (actual != expected)
{
std::cerr << "Failed compare_hash32_reversed_nbits test case with hashes:" << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(ha) << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(hb) << std::endl;
r = false;
}
EXPECT_EQ(expected, actual);
}
}
ASSERT_TRUE(r);
const auto cmp_byte_rev = [](const crypto::hash& ha, const crypto::hash& hb, unsigned int nbytes) -> int
{
if (nbytes > sizeof(crypto::hash)) throw std::logic_error("can't compare with nbytes too big");
const uint8_t* va = (const uint8_t*)ha.data;
const uint8_t* vb = (const uint8_t*)hb.data;
for (size_t i = 31; nbytes; --i, --nbytes)
{
if (va[i] < vb[i]) return -1;
else if (va[i] > vb[i]) return 1;
}
return 0;
};
// Test partial hash compares w/o partial bytes
for (size_t i = 0; i < NUM_RANDOM_HASHES; ++i)
{
for (size_t j = 0; j < NUM_RANDOM_HASHES; ++j)
{
for (unsigned int nbytes = 0; nbytes <= 32; ++nbytes)
{
const crypto::hash& ha = random_hashes[i];
const crypto::hash& hb = random_hashes[j];
const int expected = cmp_byte_rev(ha, hb, nbytes);
const int actual = cryptonote::compare_hash32_reversed_nbits(ha, hb, nbytes * 8);
if (actual != expected)
{
std::cerr << "Failed compare_hash32_reversed_nbits test case with hashes and args:" << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(ha) << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(hb) << std::endl;
std::cerr << " nbytes=" << nbytes << std::endl;
r = false;
}
EXPECT_EQ(expected, actual);
}
}
}
ASSERT_TRUE(r);
// Test partial hash compares w/ partial bytes
for (size_t i = 0; i < NUM_RANDOM_HASHES; ++i)
{
const crypto::hash& ha = random_hashes[i];
for (size_t modnbytes = 0; modnbytes < 32; ++modnbytes)
{
for (size_t modbitpos = 0; modbitpos < 8; ++modbitpos)
{
const size_t modbytepos = 31 - modnbytes;
const uint8_t mask = 1 << modbitpos;
const bool bit_was_zero = 0 == (static_cast<uint8_t>(ha.data[modbytepos]) & mask);
const unsigned int modnbits = modnbytes * 8 + (7 - modbitpos);
// Create modified random hash by flipping one bit
crypto::hash hb = ha;
hb.data[modbytepos] = static_cast<uint8_t>(hb.data[modbytepos]) ^ mask;
for (unsigned int cmpnbits = 0; cmpnbits <= 256; ++cmpnbits)
{
const int expected = cmpnbits <= modnbits ? 0 : bit_was_zero ? -1 : 1;
const int actual = cryptonote::compare_hash32_reversed_nbits(ha, hb, cmpnbits);
if (actual != expected)
{
std::cerr << "Failed compare_hash32_reversed_nbits test case with hashes and args:" << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(ha) << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(hb) << std::endl;
std::cerr << " modnbytes=" << modnbytes << std::endl;
std::cerr << " modbitpos=" << modbitpos << std::endl;
std::cerr << " cmpnbits=" << cmpnbits << std::endl;
r = false;
}
EXPECT_EQ(expected, actual);
}
}
}
}
ASSERT_TRUE(r);
// Test equality
for (size_t i = 0; i < NUM_RANDOM_HASHES; ++i)
{
const crypto::hash& ha = random_hashes[i];
for (unsigned int nbits = 0; nbits <= 256; ++nbits)
{
const int actual = cryptonote::compare_hash32_reversed_nbits(ha, ha, nbits);
if (actual)
{
std::cerr << "Failed compare_hash32_reversed_nbits test case with hash and args:" << std::endl;
std::cerr << " " << epee::string_tools::pod_to_hex(ha) << std::endl;
std::cerr << " nbits=" << nbits << std::endl;
r = false;
}
EXPECT_EQ(0, actual);
}
}
}
TEST(LMDB_kanonymity, make_hash32_loose_template)
{
const std::string example_1 = "0abcdef1234567890abcdef1234567890abcdef1234567890abcdef123456789";
test_make_template(example_1, 0, "");
test_make_template(example_1, 1, "80");
test_make_template(example_1, 2, "80");
test_make_template(example_1, 3, "80");
test_make_template(example_1, 4, "80");
test_make_template(example_1, 5, "88");
test_make_template(example_1, 6, "88");
test_make_template(example_1, 7, "88");
test_make_template(example_1, 8, "89");
test_make_template(example_1, 9, "0089");
test_make_template(example_1, 10, "4089");
test_make_template(example_1, 11, "6089");
test_make_template(example_1, 12, "6089");
test_make_template(example_1, 13, "6089");
test_make_template(example_1, 14, "6489");
test_make_template(example_1, 15, "6689");
test_make_template(example_1, 16, "6789");
test_make_template(example_1, 32, "23456789");
test_make_template(example_1, 64, "0abcdef123456789");
test_make_template(example_1, 128, "0abcdef1234567890abcdef123456789");
test_make_template(example_1, 256, example_1);
}
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