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/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <fcntl.h>
#ifdef __linux__
#include <sys/syscall.h>
#endif
#include "curve25519.h"
#include "encoding.h"
#include "subcommands.h"
static inline ssize_t get_random_bytes(uint8_t *out, size_t len)
{
ssize_t ret;
int fd;
#if defined(__NR_getrandom) && defined(__linux__)
ret = syscall(__NR_getrandom, out, len, 0);
if (ret >= 0)
return ret;
#endif
fd = open("/dev/urandom", O_RDONLY);
if (fd < 0)
return fd;
ret = read(fd, out, len);
close(fd);
return ret;
}
int genkey_main(int argc, char *argv[])
{
uint8_t key[WG_KEY_LEN];
char base64[WG_KEY_LEN_BASE64];
struct stat stat;
if (argc != 1) {
fprintf(stderr, "Usage: %s %s\n", PROG_NAME, argv[0]);
return 1;
}
if (!fstat(STDOUT_FILENO, &stat) && S_ISREG(stat.st_mode) && stat.st_mode & S_IRWXO)
fputs("Warning: writing to world accessible file.\nConsider setting the umask to 077 and trying again.\n", stderr);
if (get_random_bytes(key, WG_KEY_LEN) != WG_KEY_LEN) {
perror("getrandom");
return 1;
}
if (!strcmp(argv[0], "genkey"))
curve25519_normalize_secret(key);
key_to_base64(base64, key);
puts(base64);
return 0;
}
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