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// Copyright 2016 The BoringSSL Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <contrib/restricted/google/boringssl/include/openssl/rand.h>
#include "../bcm_support.h"
#include "internal.h"
#if defined(OPENSSL_RAND_DETERMINISTIC)
#include <string.h>
#include <contrib/restricted/google/boringssl/include/openssl/chacha.h>
#include "../internal.h"
using namespace bssl;
// g_num_calls is the number of calls to |CRYPTO_sysrand| that have occurred.
//
// 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;
static StaticMutex g_num_calls_lock;
void RAND_reset_for_fuzzing() { g_num_calls = 0; }
void bssl::CRYPTO_init_sysrand() {}
void bssl::CRYPTO_sysrand(uint8_t *out, size_t requested) {
static const uint8_t kZeroKey[32] = {0};
g_num_calls_lock.LockWrite();
uint64_t num_calls = g_num_calls++;
g_num_calls_lock.UnlockWrite();
uint8_t nonce[12];
OPENSSL_memset(nonce, 0, sizeof(nonce));
OPENSSL_memcpy(nonce, &num_calls, sizeof(num_calls));
OPENSSL_memset(out, 0, requested);
CRYPTO_chacha_20(out, out, requested, kZeroKey, nonce, 0);
}
#endif // OPENSSL_RAND_DETERMINISTIC
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