ref: 98c1cd7ae022efe276123898af6b892eade0732c
dir: /third_party/boringssl/src/crypto/rand_extra/passive.c/
/* Copyright (c) 2020, 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/base.h>
#include "../fipsmodule/rand/internal.h"
#if defined(BORINGSSL_FIPS)
// RAND_need_entropy is called by the FIPS module when it has blocked because of
// a lack of entropy. This signal is used as an indication to feed it more.
void RAND_need_entropy(size_t bytes_needed) {
uint8_t buf[CTR_DRBG_ENTROPY_LEN * BORINGSSL_FIPS_OVERREAD];
size_t todo = sizeof(buf);
if (todo > bytes_needed) {
todo = bytes_needed;
}
int used_cpu;
CRYPTO_get_seed_entropy(buf, todo, &used_cpu);
RAND_load_entropy(buf, todo, used_cpu);
}
#endif // FIPS