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85 lines
1.9 KiB
85 lines
1.9 KiB
/*
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Copyright (c) 2020 tevador <tevador@gmail.com>
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All rights reserved.
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*/
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#include <monero_seed/secure_random.hpp>
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#include <stdexcept>
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#include <cstdlib>
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#if defined(_WIN32) || defined(__CYGWIN__)
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#define WINAPI
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#include <windows.h>
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#include <ntsecapi.h>
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#elif defined __linux__ && defined __GLIBC__ || __ANDROID__ || __IOS__
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#define STRINGIFY(x) #x
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#define STR(x) STRINGIFY(x)
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#if __GLIBC__ > 2 || __GLIBC_MINOR__ > 24
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#define LINUX_GETENTROPY
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#include <sys/random.h>
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#else
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#pragma message("Warning: getentropy is not available in GLIBC " \
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STR(__GLIBC__) "." STR(__GLIBC_MINOR__))
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#define UNIX_FALLBACK
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#include <sys/syscall.h>
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#if defined(SYS_getrandom)
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#define LINUX_TRY_SYSCALL
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#include <sys/syscall.h>
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#include <errno.h>
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#else
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#pragma message("Warning: Kernel doesn't support SYS_getrandom")
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#endif
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#endif
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#else
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#define UNIX_FALLBACK
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#endif
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#if defined(UNIX_FALLBACK)
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define RANDOM_FILE "/dev/urandom"
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#endif
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void secure_random::gen_bytes(void* output, size_t size) {
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#if defined(WINAPI)
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if (!RtlGenRandom(output, size)) {
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throw std::runtime_error("RtlGenRandom failed");
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}
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#elif defined(LINUX_GETENTROPY)
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if (-1 == getentropy(output, size)) {
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throw std::runtime_error("getentropy failed");
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}
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#else
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#if defined(LINUX_TRY_SYSCALL)
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if (size <= 256) {
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if (0 == syscall(SYS_getrandom, output, size, 0)) {
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return;
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}
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}
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#endif
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int fd = open(RANDOM_FILE, O_RDONLY);
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if (fd == -1) {
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throw std::runtime_error("Unable to open " RANDOM_FILE);
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}
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char* outptr = (char*)output;
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while (size) {
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ssize_t len = read(fd, outptr, size);
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if (len < 0) {
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#ifndef __APPLE__
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if (errno != EINTR && errno != EAGAIN) {
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break;
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}
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#endif
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continue;
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}
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outptr += len;
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size -= len;
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}
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close(fd);
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if (size) {
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throw std::runtime_error("Unable to read " RANDOM_FILE);
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}
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#endif
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}
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