Projects: Include libsodium (#1051)

Add libsodium fuzzers.

Add secret_key_auth_fuzzer and secretbox_easy_fuzzer targets from libsodium.

1 files changed, 28 insertions, 0 deletions

diff --git a/projects/libsodium/secretbox_easy_fuzzer.cc b/projects/libsodium/secretbox_easy_fuzzer.cc
new file mode 100644
index 000000000..4e25bcc7a
--- /dev/null
+++ b/projects/libsodium/secretbox_easy_fuzzer.cc
@@ -0,0 +1,28 @@
+#include <assert.h>
+#include <sodium.h>
+
+#include "fake_random.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size) {
+  int initialized = sodium_init();
+  assert(initialized >= 0);
+
+  setup_fake_random(data, size);
+
+  unsigned char key[crypto_secretbox_KEYBYTES];
+  unsigned char nonce[crypto_secretbox_NONCEBYTES];
+
+  // these use a deterministic generator
+  crypto_secretbox_keygen(key);
+  randombytes_buf(nonce, sizeof nonce);
+
+  size_t ciphertext_len = crypto_secretbox_MACBYTES + size;
+  unsigned char ciphertext[ciphertext_len];
+
+  crypto_secretbox_easy(ciphertext, data, size, nonce, key);
+
+  unsigned char decrypted[size];
+  crypto_secretbox_open_easy(decrypted, ciphertext, ciphertext_len, nonce, key);
+
+  return 0;
+}