1  // Copyright (c) 2020-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <crypto/aes.h>
 6  #include <test/fuzz/FuzzedDataProvider.h>
 7  #include <test/fuzz/fuzz.h>
 8  #include <test/fuzz/util.h>
 9  
10  #include <cassert>
11  #include <cstdint>
12  #include <vector>
13  
14  FUZZ_TARGET(crypto_aes256cbc)
15  {
16      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
17      const std::vector<uint8_t> key = ConsumeFixedLengthByteVector(fuzzed_data_provider, AES256_KEYSIZE);
18      const std::vector<uint8_t> iv = ConsumeFixedLengthByteVector(fuzzed_data_provider, AES_BLOCKSIZE);
19      const bool pad = fuzzed_data_provider.ConsumeBool();
20  
21      AES256CBCEncrypt encrypt{key.data(), iv.data(), pad};
22      AES256CBCDecrypt decrypt{key.data(), iv.data(), pad};
23  
24      LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
25          const std::vector<uint8_t> plaintext = ConsumeRandomLengthByteVector(fuzzed_data_provider);
26          std::vector<uint8_t> ciphertext(plaintext.size() + AES_BLOCKSIZE);
27          const int encrypt_ret = encrypt.Encrypt(plaintext.data(), plaintext.size(), ciphertext.data());
28          ciphertext.resize(encrypt_ret);
29          std::vector<uint8_t> decrypted_plaintext(ciphertext.size());
30          const int decrypt_ret = decrypt.Decrypt(ciphertext.data(), ciphertext.size(), decrypted_plaintext.data());
31          decrypted_plaintext.resize(decrypt_ret);
32          assert(decrypted_plaintext == plaintext || (!pad && plaintext.size() % AES_BLOCKSIZE != 0 && encrypt_ret == 0 && decrypt_ret == 0));
33      }
34  }