| /* uECC_platform_specific.c - Implementation of platform specific functions*/ |
| |
| /* Copyright (c) 2014, Kenneth MacKay |
| * 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 HOLDER 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.*/ |
| |
| /* |
| * Copyright (C) 2017 by Intel Corporation, 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. |
| * |
| * - Neither the name of Intel Corporation nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * 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. |
| * |
| * uECC_platform_specific.c -- Implementation of platform specific functions |
| */ |
| |
| |
| #if defined(unix) || defined(__linux__) || defined(__unix__) || \ |
| defined(__unix) | (defined(__APPLE__) && defined(__MACH__)) || \ |
| defined(uECC_POSIX) |
| |
| /* Some POSIX-like system with /dev/urandom or /dev/random. */ |
| #include <sys/types.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include <stdint.h> |
| |
| #ifndef O_CLOEXEC |
| #define O_CLOEXEC 0 |
| #endif |
| |
| int default_CSPRNG(uint8_t *dest, unsigned int size) { |
| |
| /* input sanity check: */ |
| if (dest == (uint8_t *) 0 || (size <= 0)) |
| return 0; |
| |
| int fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC); |
| if (fd == -1) { |
| fd = open("/dev/random", O_RDONLY | O_CLOEXEC); |
| if (fd == -1) { |
| return 0; |
| } |
| } |
| |
| char *ptr = (char *)dest; |
| size_t left = (size_t) size; |
| while (left > 0) { |
| ssize_t bytes_read = read(fd, ptr, left); |
| if (bytes_read <= 0) { // read failed |
| close(fd); |
| return 0; |
| } |
| left -= bytes_read; |
| ptr += bytes_read; |
| } |
| |
| close(fd); |
| return 1; |
| } |
| |
| #endif /* platform */ |
| |