From 86115a8a65c98d0665100b5ae85cc661d1404783 Mon Sep 17 00:00:00 2001
From: Nardi Ivan <nardi.ivan@gmail.com>
Date: Tue, 3 Oct 2023 09:13:43 +0200
Subject: fuzz: extend fuzzing coverage

---
 fuzz/fuzz_gcrypt_aes.cpp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 fuzz/fuzz_gcrypt_aes.cpp

(limited to 'fuzz/fuzz_gcrypt_aes.cpp')

diff --git a/fuzz/fuzz_gcrypt_aes.cpp b/fuzz/fuzz_gcrypt_aes.cpp
new file mode 100644
index 000000000..1469ab0ce
--- /dev/null
+++ b/fuzz/fuzz_gcrypt_aes.cpp
@@ -0,0 +1,62 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include "fuzzer/FuzzedDataProvider.h"
+
+#define MBEDTLS_CHECK_RETURN_TYPICAL
+#include "../src/lib/third_party/include/gcrypt/aes.h"
+
+extern int force_no_aesni;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  FuzzedDataProvider fuzzed_data(data, size);
+  mbedtls_aes_context *ctx;
+  int key_lens[] = { 128, 192, 256, 512 /* invalid */ };
+  unsigned char *input, *output, *key;
+  int i, key_len, mode, rc;
+
+  /* No real memory allocations involved */
+
+  if(fuzzed_data.remaining_bytes() < 1 + 1 + 4 + 512 / 8 + 16)
+    return -1;
+
+  posix_memalign((void **)&input, 8, 16);
+  posix_memalign((void **)&output, 8, 16);
+  posix_memalign((void **)&key, 8, 512 / 8);
+  ctx = (mbedtls_aes_context *)malloc(sizeof(mbedtls_aes_context));
+
+  force_no_aesni = 0;
+  if(fuzzed_data.ConsumeBool())
+    force_no_aesni = 1;
+
+  mode = MBEDTLS_AES_ENCRYPT;
+  if(fuzzed_data.ConsumeBool())
+    mode = MBEDTLS_AES_DECRYPT;
+
+  mbedtls_aes_init(ctx);
+
+  key_len = fuzzed_data.PickValueInArray(key_lens);
+  std::vector<unsigned char>k = fuzzed_data.ConsumeBytes<u_int8_t>(key_len / 8);
+  std::vector<u_int8_t>in = fuzzed_data.ConsumeBytes<uint8_t>(16);
+
+  for(i = 0; i < 16; i++)
+    input[i] = in[i];
+  for(i = 0; i < key_len / 8; i++)
+    key[i] = k[i];
+
+  if(mode == MBEDTLS_AES_ENCRYPT)
+    rc = mbedtls_aes_setkey_enc(ctx, key, key_len);
+  else
+    rc = mbedtls_aes_setkey_dec(ctx, key, key_len);
+
+  if(rc == 0)
+    mbedtls_aes_crypt_ecb(ctx, mode, input, output);
+
+  mbedtls_aes_free(ctx);
+
+  free(ctx);
+  free(key);
+  free(input);
+  free(output);
+
+  return 0;
+}
-- 
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