[u-boot.git] / lib / uuid.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2011 Calxeda, Inc.
 */

#include <common.h>
#include <command.h>
#include <env.h>
#include <rand.h>
#include <time.h>
#include <uuid.h>
#include <linux/ctype.h>
#include <errno.h>
#include <common.h>
#include <asm/io.h>
#include <part_efi.h>
#include <malloc.h>
#include <dm/uclass.h>
#include <rng.h>

/*
 * UUID - Universally Unique IDentifier - 128 bits unique number.
 *        There are 5 versions and one variant of UUID defined by RFC4122
 *        specification. A UUID contains a set of fields. The set varies
 *        depending on the version of the UUID, as shown below:
 *        - time, MAC address(v1),
 *        - user ID(v2),
 *        - MD5 of name or URL(v3),
 *        - random data(v4),
 *        - SHA-1 of name or URL(v5),
 *
 * Layout of UUID:
 * timestamp - 60-bit: time_low, time_mid, time_hi_and_version
 * version   - 4 bit (bit 4 through 7 of the time_hi_and_version)
 * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
 * variant:  - bit 6 and 7 of clock_seq_hi_and_reserved
 * node      - 48 bit
 *
 * source: https://www.ietf.org/rfc/rfc4122.txt
 *
 * UUID binary format (16 bytes):
 *
 * 4B-2B-2B-2B-6B (big endian - network byte order)
 *
 * UUID string is 36 length of characters (36 bytes):
 *
 * 0        9    14   19   24
 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 *    be     be   be   be       be
 *
 * where x is a hexadecimal character. Fields are separated by '-'s.
 * When converting to a binary UUID, le means the field should be converted
 * to little endian and be means it should be converted to big endian.
 *
 * UUID is also used as GUID (Globally Unique Identifier) with the same binary
 * format but it differs in string format like below.
 *
 * GUID:
 * 0        9    14   19   24
 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 *    le     le   le   be       be
 *
 * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
 */
int uuid_str_valid(const char *uuid)
{
	int i, valid;

	if (uuid == NULL)
		return 0;

	for (i = 0, valid = 1; uuid[i] && valid; i++) {
		switch (i) {
		case 8: case 13: case 18: case 23:
			valid = (uuid[i] == '-');
			break;
		default:
			valid = isxdigit(uuid[i]);
			break;
		}
	}

	if (i != UUID_STR_LEN || !valid)
		return 0;

	return 1;
}

#ifdef CONFIG_PARTITION_TYPE_GUID
static const struct {
	const char *string;
	efi_guid_t guid;
} list_guid[] = {
	{"system",	PARTITION_SYSTEM_GUID},
	{"mbr",		LEGACY_MBR_PARTITION_GUID},
	{"msft",	PARTITION_MSFT_RESERVED_GUID},
	{"data",	PARTITION_BASIC_DATA_GUID},
	{"linux",	PARTITION_LINUX_FILE_SYSTEM_DATA_GUID},
	{"raid",	PARTITION_LINUX_RAID_GUID},
	{"swap",	PARTITION_LINUX_SWAP_GUID},
	{"lvm",		PARTITION_LINUX_LVM_GUID},
	{"u-boot-env",	PARTITION_U_BOOT_ENVIRONMENT},
};

/*
 * uuid_guid_get_bin() - this function get GUID bin for string
 *
 * @param guid_str - pointer to partition type string
 * @param guid_bin - pointer to allocated array for big endian output [16B]
 */
int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
		if (!strcmp(list_guid[i].string, guid_str)) {
			memcpy(guid_bin, &list_guid[i].guid, 16);
			return 0;
		}
	}
	return -ENODEV;
}

/*
 * uuid_guid_get_str() - this function get string for GUID.
 *
 * @param guid_bin - pointer to string with partition type guid [16B]
 *
 * Returns NULL if the type GUID is not known.
 */
const char *uuid_guid_get_str(const unsigned char *guid_bin)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
		if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
			return list_guid[i].string;
		}
	}
	return NULL;
}
#endif

/*
 * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
 *
 * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
 * @param uuid_bin - pointer to allocated array for big endian output [16B]
 * @str_format     - UUID string format: 0 - UUID; 1 - GUID
 */
int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
		    int str_format)
{
	uint16_t tmp16;
	uint32_t tmp32;
	uint64_t tmp64;

	if (!uuid_str_valid(uuid_str)) {
#ifdef CONFIG_PARTITION_TYPE_GUID
		if (!uuid_guid_get_bin(uuid_str, uuid_bin))
			return 0;
#endif
		return -EINVAL;
	}

	if (str_format == UUID_STR_FORMAT_STD) {
		tmp32 = cpu_to_be32(hextoul(uuid_str, NULL));
		memcpy(uuid_bin, &tmp32, 4);

		tmp16 = cpu_to_be16(hextoul(uuid_str + 9, NULL));
		memcpy(uuid_bin + 4, &tmp16, 2);

		tmp16 = cpu_to_be16(hextoul(uuid_str + 14, NULL));
		memcpy(uuid_bin + 6, &tmp16, 2);
	} else {
		tmp32 = cpu_to_le32(hextoul(uuid_str, NULL));
		memcpy(uuid_bin, &tmp32, 4);

		tmp16 = cpu_to_le16(hextoul(uuid_str + 9, NULL));
		memcpy(uuid_bin + 4, &tmp16, 2);

		tmp16 = cpu_to_le16(hextoul(uuid_str + 14, NULL));
		memcpy(uuid_bin + 6, &tmp16, 2);
	}

	tmp16 = cpu_to_be16(hextoul(uuid_str + 19, NULL));
	memcpy(uuid_bin + 8, &tmp16, 2);

	tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16));
	memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6);

	return 0;
}

/*
 * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
 *
 * @param uuid_bin:	pointer to binary data of UUID (big endian) [16B]
 * @param uuid_str:	pointer to allocated array for output string [37B]
 * @str_format:		bit 0: 0 - UUID; 1 - GUID
 *			bit 1: 0 - lower case; 2 - upper case
 */
void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str,
		     int str_format)
{
	const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
						  9, 10, 11, 12, 13, 14, 15};
	const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
						  9, 10, 11, 12, 13, 14, 15};
	const u8 *char_order;
	const char *format;
	int i;

	/*
	 * UUID and GUID bin data - always in big endian:
	 * 4B-2B-2B-2B-6B
	 * be be be be be
	 */
	if (str_format & UUID_STR_FORMAT_GUID)
		char_order = guid_char_order;
	else
		char_order = uuid_char_order;
	if (str_format & UUID_STR_UPPER_CASE)
		format = "%02X";
	else
		format = "%02x";

	for (i = 0; i < 16; i++) {
		sprintf(uuid_str, format, uuid_bin[char_order[i]]);
		uuid_str += 2;
		switch (i) {
		case 3:
		case 5:
		case 7:
		case 9:
			*uuid_str++ = '-';
			break;
		}
	}
}

/*
 * gen_rand_uuid() - this function generates a random binary UUID version 4.
 *                   In this version all fields beside 4 bits of version and
 *                   2 bits of variant are randomly generated.
 *
 * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
*/
#if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID)
void gen_rand_uuid(unsigned char *uuid_bin)
{
	u32 ptr[4];
	struct uuid *uuid = (struct uuid *)ptr;
	int i, ret;
	struct udevice *devp;
	u32 randv = 0;

	if (IS_ENABLED(CONFIG_DM_RNG)) {
		ret = uclass_get_device(UCLASS_RNG, 0, &devp);
		if (ret) {
			ret = dm_rng_read(devp, &randv, sizeof(randv));
			if (ret < 0)
				randv = 0;
		}
	}
	if (randv)
		srand(randv);
	else
		srand(get_ticks() + rand());

	/* Set all fields randomly */
	for (i = 0; i < 4; i++)
		ptr[i] = rand();

	clrsetbits_be16(&uuid->time_hi_and_version,
			UUID_VERSION_MASK,
			UUID_VERSION << UUID_VERSION_SHIFT);

	clrsetbits_8(&uuid->clock_seq_hi_and_reserved,
		     UUID_VARIANT_MASK,
		     UUID_VARIANT << UUID_VARIANT_SHIFT);

	memcpy(uuid_bin, uuid, 16);
}

/*
 * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
 *                       formats UUID or GUID.
 *
 * @param uuid_str - pointer to allocated array [37B].
 * @param          - uuid output type: UUID - 0, GUID - 1
 */
void gen_rand_uuid_str(char *uuid_str, int str_format)
{
	unsigned char uuid_bin[UUID_BIN_LEN];

	/* Generate UUID (big endian) */
	gen_rand_uuid(uuid_bin);

	/* Convert UUID bin to UUID or GUID formated STRING  */
	uuid_bin_to_str(uuid_bin, uuid_str, str_format);
}

#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CMD_UUID)
int do_uuid(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	char uuid[UUID_STR_LEN + 1];
	int str_format;

	if (!strcmp(argv[0], "uuid"))
		str_format = UUID_STR_FORMAT_STD;
	else
		str_format = UUID_STR_FORMAT_GUID;

	if (argc > 2)
		return CMD_RET_USAGE;

	gen_rand_uuid_str(uuid, str_format);

	if (argc == 1)
		printf("%s\n", uuid);
	else
		env_set(argv[1], uuid);

	return CMD_RET_SUCCESS;
}

U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	   "UUID - generate random Universally Unique Identifier",
	   "[<varname>]\n"
	   "Argument:\n"
	   "varname: for set result in a environment variable\n"
	   "e.g. uuid uuid_env"
);

U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	   "GUID - generate Globally Unique Identifier based on random UUID",
	   "[<varname>]\n"
	   "Argument:\n"
	   "varname: for set result in a environment variable\n"
	   "e.g. guid guid_env"
);
#endif /* CONFIG_CMD_UUID */
#endif /* CONFIG_RANDOM_UUID || CONFIG_CMD_UUID */
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
e11938ea JH	2	/*
e11938ea JH	3	* Copyright 2011 Calxeda, Inc.
e11938ea JH	4	*/
e11938ea JH	5
89c8230d	6	#include <common.h>
09140113	7	#include <command.h>
9fb625ce	8	#include <env.h>
90526e9f	9	#include <rand.h>
1045315d	10	#include <time.h>
ba06b3c5	11	#include <uuid.h>
e11938ea	12	#include <linux/ctype.h>
a96a0e61 PM	13	#include <errno.h>
a96a0e61 PM	14	#include <common.h>
d718ded0 PM	15	#include <asm/io.h>
	16	#include <part_efi.h>
	17	#include <malloc.h>
92fdad28 MB	18	#include <dm/uclass.h>
92fdad28 MB	19	#include <rng.h>
e11938ea JH	20
e11938ea JH	21	/*
a96a0e61 PM	22	* UUID - Universally Unique IDentifier - 128 bits unique number.
a96a0e61 PM	23	* There are 5 versions and one variant of UUID defined by RFC4122
4e4815fe PM	24	* specification. A UUID contains a set of fields. The set varies
	25	* depending on the version of the UUID, as shown below:
	26	* - time, MAC address(v1),
	27	* - user ID(v2),
	28	* - MD5 of name or URL(v3),
	29	* - random data(v4),
	30	* - SHA-1 of name or URL(v5),
	31	*
	32	* Layout of UUID:
	33	* timestamp - 60-bit: time_low, time_mid, time_hi_and_version
	34	* version - 4 bit (bit 4 through 7 of the time_hi_and_version)
	35	* clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
	36	* variant: - bit 6 and 7 of clock_seq_hi_and_reserved
	37	* node - 48 bit
	38	*
	39	* source: https://www.ietf.org/rfc/rfc4122.txt
a96a0e61 PM	40	*
	41	* UUID binary format (16 bytes):
	42	*
	43	* 4B-2B-2B-2B-6B (big endian - network byte order)
	44	*
	45	* UUID string is 36 length of characters (36 bytes):
	46	*
	47	* 0 9 14 19 24
	48	* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	49	* be be be be be
	50	*
	51	* where x is a hexadecimal character. Fields are separated by '-'s.
	52	* When converting to a binary UUID, le means the field should be converted
	53	* to little endian and be means it should be converted to big endian.
e11938ea	54	*
a96a0e61 PM	55	* UUID is also used as GUID (Globally Unique Identifier) with the same binary
a96a0e61 PM	56	* format but it differs in string format like below.
e11938ea	57	*
a96a0e61	58	* GUID:
e11938ea JH	59	* 0 9 14 19 24
	60	* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	61	* le le le be be
a96a0e61 PM	62	*
a96a0e61 PM	63	* GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
e11938ea	64	*/
e11938ea JH	65	int uuid_str_valid(const char *uuid)
	66	{
	67	int i, valid;
	68
	69	if (uuid == NULL)
	70	return 0;
	71
	72	for (i = 0, valid = 1; uuid[i] && valid; i++) {
	73	switch (i) {
	74	case 8: case 13: case 18: case 23:
	75	valid = (uuid[i] == '-');
	76	break;
	77	default:
	78	valid = isxdigit(uuid[i]);
	79	break;
	80	}
	81	}
	82
d718ded0	83	if (i != UUID_STR_LEN \|\| !valid)
e11938ea JH	84	return 0;
	85
	86	return 1;
	87	}
	88
bcb41dca PD	89	#ifdef CONFIG_PARTITION_TYPE_GUID
	90	static const struct {
	91	const char *string;
	92	efi_guid_t guid;
	93	} list_guid[] = {
	94	{"system", PARTITION_SYSTEM_GUID},
	95	{"mbr", LEGACY_MBR_PARTITION_GUID},
	96	{"msft", PARTITION_MSFT_RESERVED_GUID},
	97	{"data", PARTITION_BASIC_DATA_GUID},
	98	{"linux", PARTITION_LINUX_FILE_SYSTEM_DATA_GUID},
	99	{"raid", PARTITION_LINUX_RAID_GUID},
	100	{"swap", PARTITION_LINUX_SWAP_GUID},
c0364ce1 RV	101	{"lvm", PARTITION_LINUX_LVM_GUID},
c0364ce1 RV	102	{"u-boot-env", PARTITION_U_BOOT_ENVIRONMENT},
bcb41dca PD	103	};
	104
	105	/*
	106	* uuid_guid_get_bin() - this function get GUID bin for string
	107	*
	108	* @param guid_str - pointer to partition type string
	109	* @param guid_bin - pointer to allocated array for big endian output [16B]
	110	*/
	111	int uuid_guid_get_bin(const char guid_str, unsigned char guid_bin)
	112	{
	113	int i;
	114
	115	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
	116	if (!strcmp(list_guid[i].string, guid_str)) {
	117	memcpy(guid_bin, &list_guid[i].guid, 16);
	118	return 0;
	119	}
	120	}
	121	return -ENODEV;
	122	}
	123
	124	/*
	125	* uuid_guid_get_str() - this function get string for GUID.
	126	*
	127	* @param guid_bin - pointer to string with partition type guid [16B]
31ce367c RV	128	*
31ce367c RV	129	* Returns NULL if the type GUID is not known.
bcb41dca	130	*/
31ce367c	131	const char uuid_guid_get_str(const unsigned char guid_bin)
bcb41dca PD	132	{
	133	int i;
	134
bcb41dca PD	135	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
bcb41dca PD	136	if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
31ce367c	137	return list_guid[i].string;
bcb41dca PD	138	}
bcb41dca PD	139	}
31ce367c	140	return NULL;
bcb41dca PD	141	}
	142	#endif
	143
d718ded0 PM	144	/*
	145	* uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
	146	*
bcb41dca	147	* @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
d718ded0 PM	148	* @param uuid_bin - pointer to allocated array for big endian output [16B]
	149	* @str_format - UUID string format: 0 - UUID; 1 - GUID
	150	*/
2c2ca207 SG	151	int uuid_str_to_bin(const char uuid_str, unsigned char uuid_bin,
2c2ca207 SG	152	int str_format)
e11938ea JH	153	{
	154	uint16_t tmp16;
	155	uint32_t tmp32;
	156	uint64_t tmp64;
	157
bcb41dca PD	158	if (!uuid_str_valid(uuid_str)) {
	159	#ifdef CONFIG_PARTITION_TYPE_GUID
	160	if (!uuid_guid_get_bin(uuid_str, uuid_bin))
	161	return 0;
	162	#endif
a96a0e61	163	return -EINVAL;
bcb41dca	164	}
a96a0e61	165
d718ded0	166	if (str_format == UUID_STR_FORMAT_STD) {
7e5f460e	167	tmp32 = cpu_to_be32(hextoul(uuid_str, NULL));
d718ded0	168	memcpy(uuid_bin, &tmp32, 4);
e11938ea	169
7e5f460e	170	tmp16 = cpu_to_be16(hextoul(uuid_str + 9, NULL));
d718ded0	171	memcpy(uuid_bin + 4, &tmp16, 2);
e11938ea	172
7e5f460e	173	tmp16 = cpu_to_be16(hextoul(uuid_str + 14, NULL));
d718ded0 PM	174	memcpy(uuid_bin + 6, &tmp16, 2);
d718ded0 PM	175	} else {
7e5f460e	176	tmp32 = cpu_to_le32(hextoul(uuid_str, NULL));
d718ded0	177	memcpy(uuid_bin, &tmp32, 4);
e11938ea	178
7e5f460e	179	tmp16 = cpu_to_le16(hextoul(uuid_str + 9, NULL));
d718ded0	180	memcpy(uuid_bin + 4, &tmp16, 2);
e11938ea	181
7e5f460e	182	tmp16 = cpu_to_le16(hextoul(uuid_str + 14, NULL));
d718ded0 PM	183	memcpy(uuid_bin + 6, &tmp16, 2);
	184	}
	185
7e5f460e	186	tmp16 = cpu_to_be16(hextoul(uuid_str + 19, NULL));
d718ded0	187	memcpy(uuid_bin + 8, &tmp16, 2);
e11938ea	188
d718ded0 PM	189	tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16));
d718ded0 PM	190	memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6);
a96a0e61 PM	191
	192	return 0;
	193	}
	194
d718ded0 PM	195	/*
	196	* uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
	197	*
3bad256f HS	198	* @param uuid_bin: pointer to binary data of UUID (big endian) [16B]
	199	* @param uuid_str: pointer to allocated array for output string [37B]
	200	* @str_format: bit 0: 0 - UUID; 1 - GUID
	201	* bit 1: 0 - lower case; 2 - upper case
d718ded0	202	*/
2c2ca207 SG	203	void uuid_bin_to_str(const unsigned char uuid_bin, char uuid_str,
2c2ca207 SG	204	int str_format)
a96a0e61	205	{
d718ded0 PM	206	const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
	207	9, 10, 11, 12, 13, 14, 15};
	208	const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
	209	9, 10, 11, 12, 13, 14, 15};
	210	const u8 *char_order;
3bad256f	211	const char *format;
a96a0e61 PM	212	int i;
a96a0e61 PM	213
d718ded0 PM	214	/*
	215	* UUID and GUID bin data - always in big endian:
	216	* 4B-2B-2B-2B-6B
	217	* be be be be be
	218	*/
3bad256f HS	219	if (str_format & UUID_STR_FORMAT_GUID)
	220	char_order = guid_char_order;
	221	else
d718ded0	222	char_order = uuid_char_order;
3bad256f HS	223	if (str_format & UUID_STR_UPPER_CASE)
3bad256f HS	224	format = "%02X";
d718ded0	225	else
3bad256f	226	format = "%02x";
d718ded0	227
a96a0e61	228	for (i = 0; i < 16; i++) {
3bad256f	229	sprintf(uuid_str, format, uuid_bin[char_order[i]]);
d718ded0	230	uuid_str += 2;
a96a0e61 PM	231	switch (i) {
	232	case 3:
	233	case 5:
	234	case 7:
	235	case 9:
d718ded0	236	*uuid_str++ = '-';
a96a0e61 PM	237	break;
	238	}
	239	}
e11938ea	240	}
4e4815fe PM	241
	242	/*
	243	* gen_rand_uuid() - this function generates a random binary UUID version 4.
	244	* In this version all fields beside 4 bits of version and
	245	* 2 bits of variant are randomly generated.
	246	*
	247	* @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
	248	*/
89c8230d	249	#if defined(CONFIG_RANDOM_UUID) \|\| defined(CONFIG_CMD_UUID)
4e4815fe PM	250	void gen_rand_uuid(unsigned char *uuid_bin)
4e4815fe PM	251	{
a1b633df HS	252	u32 ptr[4];
a1b633df HS	253	struct uuid uuid = (struct uuid )ptr;
92fdad28 MB	254	int i, ret;
	255	struct udevice *devp;
	256	u32 randv = 0;
	257
	258	if (IS_ENABLED(CONFIG_DM_RNG)) {
	259	ret = uclass_get_device(UCLASS_RNG, 0, &devp);
	260	if (ret) {
	261	ret = dm_rng_read(devp, &randv, sizeof(randv));
	262	if (ret < 0)
	263	randv = 0;
	264	}
	265	}
	266	if (randv)
	267	srand(randv);
	268	else
	269	srand(get_ticks() + rand());
4ccf678f	270
4e4815fe	271	/* Set all fields randomly */
a1b633df HS	272	for (i = 0; i < 4; i++)
a1b633df HS	273	ptr[i] = rand();
4e4815fe	274
a1b633df	275	clrsetbits_be16(&uuid->time_hi_and_version,
4e4815fe PM	276	UUID_VERSION_MASK,
	277	UUID_VERSION << UUID_VERSION_SHIFT);
	278
a1b633df	279	clrsetbits_8(&uuid->clock_seq_hi_and_reserved,
4e4815fe PM	280	UUID_VARIANT_MASK,
	281	UUID_VARIANT << UUID_VARIANT_SHIFT);
	282
a1b633df	283	memcpy(uuid_bin, uuid, 16);
4e4815fe PM	284	}
	285
	286	/*
	287	* gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
	288	* formats UUID or GUID.
	289	*
	290	* @param uuid_str - pointer to allocated array [37B].
	291	* @param - uuid output type: UUID - 0, GUID - 1
	292	*/
	293	void gen_rand_uuid_str(char *uuid_str, int str_format)
	294	{
	295	unsigned char uuid_bin[UUID_BIN_LEN];
	296
	297	/* Generate UUID (big endian) */
	298	gen_rand_uuid(uuid_bin);
	299
	300	/* Convert UUID bin to UUID or GUID formated STRING */
	301	uuid_bin_to_str(uuid_bin, uuid_str, str_format);
	302	}
89c8230d	303
05f6da3f	304	#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CMD_UUID)
09140113	305	int do_uuid(struct cmd_tbl cmdtp, int flag, int argc, char const argv[])
89c8230d PM	306	{
	307	char uuid[UUID_STR_LEN + 1];
	308	int str_format;
	309
	310	if (!strcmp(argv[0], "uuid"))
	311	str_format = UUID_STR_FORMAT_STD;
	312	else
	313	str_format = UUID_STR_FORMAT_GUID;
	314
	315	if (argc > 2)
	316	return CMD_RET_USAGE;
	317
	318	gen_rand_uuid_str(uuid, str_format);
	319
	320	if (argc == 1)
	321	printf("%s\n", uuid);
	322	else
382bee57	323	env_set(argv[1], uuid);
89c8230d PM	324
	325	return CMD_RET_SUCCESS;
	326	}
	327
	328	U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	329	"UUID - generate random Universally Unique Identifier",
	330	"[<varname>]\n"
	331	"Argument:\n"
	332	"varname: for set result in a environment variable\n"
	333	"e.g. uuid uuid_env"
	334	);
	335
	336	U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	337	"GUID - generate Globally Unique Identifier based on random UUID",
	338	"[<varname>]\n"
	339	"Argument:\n"
	340	"varname: for set result in a environment variable\n"
	341	"e.g. guid guid_env"
	342	);
39206382 PM	343	#endif /* CONFIG_CMD_UUID */
39206382 PM	344	#endif /* CONFIG_RANDOM_UUID \|\| CONFIG_CMD_UUID */