1*adf37648SKyle Evans // SPDX-License-Identifier: GPL-2.0 OR MIT
2*adf37648SKyle Evans /*
3*adf37648SKyle Evans * Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4*adf37648SKyle Evans */
5*adf37648SKyle Evans
6*adf37648SKyle Evans #include <errno.h>
7*adf37648SKyle Evans #include <stdio.h>
8*adf37648SKyle Evans
9*adf37648SKyle Evans #include "curve25519.h"
10*adf37648SKyle Evans #include "encoding.h"
11*adf37648SKyle Evans #include "subcommands.h"
12*adf37648SKyle Evans #include "ctype.h"
13*adf37648SKyle Evans
pubkey_main(int argc,const char * argv[])14*adf37648SKyle Evans int pubkey_main(int argc, const char *argv[])
15*adf37648SKyle Evans {
16*adf37648SKyle Evans uint8_t key[WG_KEY_LEN] __attribute__((aligned(sizeof(uintptr_t))));
17*adf37648SKyle Evans char base64[WG_KEY_LEN_BASE64];
18*adf37648SKyle Evans int trailing_char;
19*adf37648SKyle Evans
20*adf37648SKyle Evans if (argc != 1) {
21*adf37648SKyle Evans fprintf(stderr, "Usage: %s %s\n", PROG_NAME, argv[0]);
22*adf37648SKyle Evans return 1;
23*adf37648SKyle Evans }
24*adf37648SKyle Evans
25*adf37648SKyle Evans if (fread(base64, 1, sizeof(base64) - 1, stdin) != sizeof(base64) - 1) {
26*adf37648SKyle Evans errno = EINVAL;
27*adf37648SKyle Evans fprintf(stderr, "%s: Key is not the correct length or format\n", PROG_NAME);
28*adf37648SKyle Evans return 1;
29*adf37648SKyle Evans }
30*adf37648SKyle Evans base64[WG_KEY_LEN_BASE64 - 1] = '\0';
31*adf37648SKyle Evans
32*adf37648SKyle Evans for (;;) {
33*adf37648SKyle Evans trailing_char = getc(stdin);
34*adf37648SKyle Evans if (!trailing_char || char_is_space(trailing_char))
35*adf37648SKyle Evans continue;
36*adf37648SKyle Evans if (trailing_char == EOF)
37*adf37648SKyle Evans break;
38*adf37648SKyle Evans fprintf(stderr, "%s: Trailing characters found after key\n", PROG_NAME);
39*adf37648SKyle Evans return 1;
40*adf37648SKyle Evans }
41*adf37648SKyle Evans
42*adf37648SKyle Evans if (!key_from_base64(key, base64)) {
43*adf37648SKyle Evans fprintf(stderr, "%s: Key is not the correct length or format\n", PROG_NAME);
44*adf37648SKyle Evans return 1;
45*adf37648SKyle Evans }
46*adf37648SKyle Evans curve25519_generate_public(key, key);
47*adf37648SKyle Evans key_to_base64(base64, key);
48*adf37648SKyle Evans puts(base64);
49*adf37648SKyle Evans return 0;
50*adf37648SKyle Evans }
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