| Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/C/Android/bionic/bionic/libc/private/ (Android Betriebssystem Version 17©) Datei vom 26.5.2026 mit Größe 2 kB |
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Quelle bionic_arc4random.hSprache: C |
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/* * Copyright (C) 2016 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #pragma once #include <sys/cdefs.h> #include <stddef.h> #include <stdlib.h> #include <unistd.h> // Before first_stage_init runs, some platforms might not have /dev/urandom and // if they do, reading that node could take seconds if they don't have access to // a hwrng. Let's skip randomness for those very specific cases. bool __libc_arc4random_ready(); // arc4random(3) aborts if it's unable to fetch entropy, which might be the case // on some low-end devices without any hwrng before first_stage_init. GCE // kernels have a workaround to ensure sufficient entropy during early boot, but // no device kernels do. This wrapper falls back to AT_RANDOM if the kernel // doesn't have enough entropy for getrandom(2) or /dev/urandom but note that // AT_RANDOM only gives us 16 bytes, and they're already taken, so it won't be // possible to add new callers. void __libc_arc4random_buf_or_die(void* buf, size_t n); // Unsafe wrapper during first_stage_init. uint32_t __libc_arc4random_uniform_or_zero(uint32_t upper_bound);
¤ Dauer der Verarbeitung: 0.10 Sekunden (vorverarbeitet am 2026-06-28) ¤*© Formatika GbR, Deutschland |
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2026-07-09