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// Copyright (c) 2020-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <crypto/chacha_poly_aead.h>
#include <crypto/poly1305.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <cassert>
#include <cstdint>
#include <limits>
#include <vector>
FUZZ_TARGET(crypto_chacha20_poly1305_aead)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
const std::vector<uint8_t> k1 = ConsumeFixedLengthByteVector(fuzzed_data_provider, CHACHA20_POLY1305_AEAD_KEY_LEN);
const std::vector<uint8_t> k2 = ConsumeFixedLengthByteVector(fuzzed_data_provider, CHACHA20_POLY1305_AEAD_KEY_LEN);
ChaCha20Poly1305AEAD aead(k1.data(), k1.size(), k2.data(), k2.size());
uint64_t seqnr_payload = 0;
uint64_t seqnr_aad = 0;
int aad_pos = 0;
size_t buffer_size = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, 4096);
std::vector<uint8_t> in(buffer_size + CHACHA20_POLY1305_AEAD_AAD_LEN + POLY1305_TAGLEN, 0);
std::vector<uint8_t> out(buffer_size + CHACHA20_POLY1305_AEAD_AAD_LEN + POLY1305_TAGLEN, 0);
bool is_encrypt = fuzzed_data_provider.ConsumeBool();
while (fuzzed_data_provider.ConsumeBool()) {
CallOneOf(
fuzzed_data_provider,
[&] {
buffer_size = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(64, 4096);
in = std::vector<uint8_t>(buffer_size + CHACHA20_POLY1305_AEAD_AAD_LEN + POLY1305_TAGLEN, 0);
out = std::vector<uint8_t>(buffer_size + CHACHA20_POLY1305_AEAD_AAD_LEN + POLY1305_TAGLEN, 0);
},
[&] {
(void)aead.Crypt(seqnr_payload, seqnr_aad, aad_pos, out.data(), out.size(), in.data(), buffer_size, is_encrypt);
},
[&] {
uint32_t len = 0;
const bool ok = aead.GetLength(&len, seqnr_aad, aad_pos, in.data());
assert(ok);
},
[&] {
if (AdditionOverflow(seqnr_payload, static_cast<uint64_t>(1))) {
return;
}
seqnr_payload += 1;
aad_pos += CHACHA20_POLY1305_AEAD_AAD_LEN;
if (aad_pos + CHACHA20_POLY1305_AEAD_AAD_LEN > CHACHA20_ROUND_OUTPUT) {
aad_pos = 0;
if (AdditionOverflow(seqnr_aad, static_cast<uint64_t>(1))) {
return;
}
seqnr_aad += 1;
}
},
[&] {
seqnr_payload = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
},
[&] {
seqnr_aad = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
},
[&] {
is_encrypt = fuzzed_data_provider.ConsumeBool();
});
}
}
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