/* 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_grpc/rand.h> #if defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE) #include <string.h> #include <openssl_grpc/chacha.h> #include "../internal.h" #include "../fipsmodule/rand/internal.h" // 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 struct CRYPTO_STATIC_MUTEX g_num_calls_lock = CRYPTO_STATIC_MUTEX_INIT; 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]; CRYPTO_STATIC_MUTEX_lock_write(&g_num_calls_lock); uint64_t num_calls = g_num_calls++; CRYPTO_STATIC_MUTEX_unlock_write(&g_num_calls_lock); 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); } void CRYPTO_sysrand_for_seed(uint8_t *out, size_t requested) { CRYPTO_sysrand(out, requested); } #endif // BORINGSSL_UNSAFE_DETERMINISTIC_MODE