Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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56 lines
1.9 KiB
56 lines
1.9 KiB
/* 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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static CRYPTO_MUTEX g_num_calls_lock = CRYPTO_MUTEX_INIT; |
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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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CRYPTO_MUTEX_lock_write(&g_num_calls_lock); |
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uint64_t num_calls = g_num_calls++; |
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CRYPTO_MUTEX_unlock_write(&g_num_calls_lock); |
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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, &num_calls, sizeof(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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} |
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void CRYPTO_sysrand_for_seed(uint8_t *out, size_t requested) { |
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CRYPTO_sysrand(out, requested); |
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} |
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#endif // BORINGSSL_UNSAFE_DETERMINISTIC_MODE
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