85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/*
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luksrku - Tool to remotely unlock LUKS disks using TLS.
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Copyright (C) 2016-2019 Johannes Bauer
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This file is part of luksrku.
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luksrku is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; this program is ONLY licensed under
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version 3 of the License, later versions are explicitly excluded.
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luksrku is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with luksrku; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Johannes Bauer <JohannesBauer@gmx.de>
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include "uuid.h"
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#include "util.h"
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bool is_valid_uuid(const char *ascii_uuid) {
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// e43fff25-5a01-40e8-b437-80b9d56c19ff
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// '-' at offsets 8 13 18 23
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if (!ascii_uuid) {
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return false;
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}
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if (strlen(ascii_uuid) != 36) {
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return false;
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}
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if ((ascii_uuid[8] != '-') || (ascii_uuid[13] != '-') || (ascii_uuid[18] != '-') || (ascii_uuid[23] != '-')) {
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return false;
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}
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if (!is_hex(ascii_uuid + 0, 8) || !is_hex(ascii_uuid + 9, 4) || !is_hex(ascii_uuid + 14, 4) || !is_hex(ascii_uuid + 19, 4) || !is_hex(ascii_uuid + 24, 12)) {
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return false;
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}
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return true;
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}
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bool parse_uuid(uint8_t *uuid, const char *ascii_uuid) {
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if (!is_valid_uuid(ascii_uuid)) {
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return false;
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}
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parse_hexstr(ascii_uuid + 0, uuid + 0, 4);
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parse_hexstr(ascii_uuid + 9, uuid + 4, 2);
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parse_hexstr(ascii_uuid + 14, uuid + 6, 2);
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parse_hexstr(ascii_uuid + 19, uuid + 8, 2);
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parse_hexstr(ascii_uuid + 24, uuid + 10, 6);
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return true;
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}
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void sprintf_uuid(char *buffer, const uint8_t *uuid) {
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buffer[0] = 0;
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for (int i = 0; i < 16; i++) {
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if ((i == 4) || (i == 6) || (i == 8) || (i == 10)) {
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buffer += sprintf(buffer, "-");
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}
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buffer += sprintf(buffer, "%02x", uuid[i]);
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}
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}
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void dump_uuid(FILE *f, const uint8_t *uuid) {
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char ascii_uuid[40];
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sprintf_uuid(ascii_uuid, uuid);
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fprintf(f, "%s", ascii_uuid);
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}
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bool uuid_randomize(uint8_t uuid[static 16]) {
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if (!buffer_randomize(uuid, 16)) {
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return false;
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}
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uuid[6] = (uuid[6] & (~0xf0)) | 0x40;
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uuid[8] = (uuid[8] & (~0xc0)) | 0x80;
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return true;
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}
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