Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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35 lines
1.4 KiB
35 lines
1.4 KiB
4 years ago
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/* Copyright (c) 2020, 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/base.h>
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#include "../fipsmodule/rand/internal.h"
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#if defined(BORINGSSL_FIPS_PASSIVE_ENTROPY)
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// RAND_need_entropy is called by the FIPS module when it has blocked because of
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// a lack of entropy. This signal is used as an indication to feed it more.
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void RAND_need_entropy(size_t bytes_needed) {
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uint8_t buf[CTR_DRBG_ENTROPY_LEN * BORINGSSL_FIPS_OVERREAD];
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size_t todo = sizeof(buf);
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if (todo > bytes_needed) {
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todo = bytes_needed;
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}
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int used_cpu;
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CRYPTO_get_seed_entropy(buf, todo, &used_cpu);
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RAND_load_entropy(buf, todo, used_cpu);
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}
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#endif // BORINGSSL_FIPS_PASSIVE_ENTROPY
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