1 // Copyright 2018 Google Inc.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <assert.h>
16 #include <stdlib.h>
17 #include <sodium.h>
18
19 #include "fake_random.h"
20
LLVMFuzzerTestOneInput(const unsigned char * data,size_t size)21 extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size) {
22 int initialized = sodium_init();
23 assert(initialized >= 0);
24
25 setup_fake_random(data, size);
26
27 unsigned char key[crypto_secretbox_KEYBYTES];
28 unsigned char nonce[crypto_secretbox_NONCEBYTES];
29
30 // these use a deterministic generator
31 crypto_secretbox_keygen(key);
32 randombytes_buf(nonce, sizeof nonce);
33
34 size_t ciphertext_len = crypto_secretbox_MACBYTES + size;
35 unsigned char *ciphertext = (unsigned char *) malloc(ciphertext_len);
36
37 crypto_secretbox_easy(ciphertext, data, size, nonce, key);
38
39 unsigned char *decrypted = (unsigned char *) malloc(size);
40 int err = crypto_secretbox_open_easy(decrypted, ciphertext, ciphertext_len, nonce, key);
41 assert(err == 0);
42
43 free((void *) ciphertext);
44 free((void *) decrypted);
45
46 return 0;
47 }
48