/*
 * Universally Unique IDentifier (UUID)
 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "crypto/crypto.h"
#include "crypto/sha1.h"
#include "uuid.h"

int uuid_str2bin(const char *str, u8 *bin)
{
	const char *pos;
	u8 *opos;

	pos = str;
	opos = bin;

	if (hexstr2bin(pos, opos, 4))
		return -1;
	pos += 8;
	opos += 4;

	if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
		return -1;
	pos += 4;
	opos += 2;

	if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
		return -1;
	pos += 4;
	opos += 2;

	if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
		return -1;
	pos += 4;
	opos += 2;

	if (*pos++ != '-' || hexstr2bin(pos, opos, 6))
		return -1;

	return 0;
}


int uuid_bin2str(const u8 *bin, char *str, size_t max_len)
{
	int len;
	len = os_snprintf(str, max_len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
			  "%02x%02x-%02x%02x%02x%02x%02x%02x",
			  bin[0], bin[1], bin[2], bin[3],
			  bin[4], bin[5], bin[6], bin[7],
			  bin[8], bin[9], bin[10], bin[11],
			  bin[12], bin[13], bin[14], bin[15]);
	if (len < 0 || (size_t) len >= max_len)
		return -1;
	return 0;
}


int is_nil_uuid(const u8 *uuid)
{
	int i;
	for (i = 0; i < UUID_LEN; i++)
		if (uuid[i])
			return 0;
	return 1;
}


void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
{
	const u8 *addr[2];
	size_t len[2];
	u8 hash[SHA1_MAC_LEN];
	u8 nsid[16] = {
		0x52, 0x64, 0x80, 0xf8,
		0xc9, 0x9b,
		0x4b, 0xe5,
		0xa6, 0x55,
		0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
	};

	addr[0] = nsid;
	len[0] = sizeof(nsid);
	addr[1] = mac_addr;
	len[1] = 6;
	sha1_vector(2, addr, len, hash);
	os_memcpy(uuid, hash, 16);

	/* Version: 5 = named-based version using SHA-1 */
	uuid[6] = (5 << 4) | (uuid[6] & 0x0f);

	/* Variant specified in RFC 4122 */
	uuid[8] = 0x80 | (uuid[8] & 0x3f);
}