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