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- /* Copyright (c) 2016, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #include <openssl/rand.h>
-
- #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
-
- #include <string.h>
-
- #include <openssl/chacha.h>
-
- #include "internal.h"
-
-
- /* g_num_calls is the number of calls to |CRYPTO_sysrand| that have occured.
- *
- * TODO(davidben): This is intentionally not thread-safe. If the fuzzer mode is
- * ever used in a multi-threaded program, replace this with a thread-local. (A
- * mutex would not be deterministic.) */
- static uint64_t g_num_calls = 0;
-
- void RAND_reset_for_fuzzing(void) { g_num_calls = 0; }
-
- void CRYPTO_sysrand(uint8_t *out, size_t requested) {
- static const uint8_t kZeroKey[32];
-
- uint8_t nonce[12];
- memset(nonce, 0, sizeof(nonce));
- memcpy(nonce, &g_num_calls, sizeof(g_num_calls));
-
- memset(out, 0, requested);
- CRYPTO_chacha_20(out, out, requested, kZeroKey, nonce, 0);
- g_num_calls++;
- }
-
- #endif /* BORINGSSL_UNSAFE_FUZZER_MODE */
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