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105 lines
4.0 KiB
105 lines
4.0 KiB
/* uECC_platform_specific.c - Implementation of platform specific functions*/ |
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/* Copyright (c) 2014, Kenneth MacKay |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* * Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE.*/ |
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/* |
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* Copyright (C) 2017 by Intel Corporation, All Rights Reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* - Neither the name of Intel Corporation nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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* uECC_platform_specific.c -- Implementation of platform specific functions |
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*/ |
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#if defined(unix) || defined(__linux__) || defined(__unix__) || \ |
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defined(__unix) | (defined(__APPLE__) && defined(__MACH__)) || \ |
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defined(uECC_POSIX) |
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/* Some POSIX-like system with /dev/urandom or /dev/random. */ |
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#include <sys/types.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <stdint.h> |
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#ifndef O_CLOEXEC |
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#define O_CLOEXEC 0 |
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#endif |
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int default_CSPRNG(uint8_t *dest, unsigned int size) { |
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/* input sanity check: */ |
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if (dest == (uint8_t *) 0 || (size <= 0)) |
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return 0; |
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int fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC); |
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if (fd == -1) { |
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fd = open("/dev/random", O_RDONLY | O_CLOEXEC); |
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if (fd == -1) { |
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return 0; |
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} |
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} |
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char *ptr = (char *)dest; |
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size_t left = (size_t) size; |
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while (left > 0) { |
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ssize_t bytes_read = read(fd, ptr, left); |
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if (bytes_read <= 0) { // read failed |
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close(fd); |
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return 0; |
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} |
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left -= bytes_read; |
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ptr += bytes_read; |
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} |
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close(fd); |
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return 1; |
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} |
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#endif /* platform */ |
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