1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2011 Calxeda, Inc.
8 #include <linux/ctype.h>
16 * UUID - Universally Unique IDentifier - 128 bits unique number.
17 * There are 5 versions and one variant of UUID defined by RFC4122
18 * specification. A UUID contains a set of fields. The set varies
19 * depending on the version of the UUID, as shown below:
20 * - time, MAC address(v1),
22 * - MD5 of name or URL(v3),
24 * - SHA-1 of name or URL(v5),
27 * timestamp - 60-bit: time_low, time_mid, time_hi_and_version
28 * version - 4 bit (bit 4 through 7 of the time_hi_and_version)
29 * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
30 * variant: - bit 6 and 7 of clock_seq_hi_and_reserved
33 * source: https://www.ietf.org/rfc/rfc4122.txt
35 * UUID binary format (16 bytes):
37 * 4B-2B-2B-2B-6B (big endian - network byte order)
39 * UUID string is 36 length of characters (36 bytes):
42 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
45 * where x is a hexadecimal character. Fields are separated by '-'s.
46 * When converting to a binary UUID, le means the field should be converted
47 * to little endian and be means it should be converted to big endian.
49 * UUID is also used as GUID (Globally Unique Identifier) with the same binary
50 * format but it differs in string format like below.
54 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
57 * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
59 int uuid_str_valid(const char *uuid
)
66 for (i
= 0, valid
= 1; uuid
[i
] && valid
; i
++) {
68 case 8: case 13: case 18: case 23:
69 valid
= (uuid
[i
] == '-');
72 valid
= isxdigit(uuid
[i
]);
77 if (i
!= UUID_STR_LEN
|| !valid
)
83 #ifdef CONFIG_PARTITION_TYPE_GUID
88 {"system", PARTITION_SYSTEM_GUID
},
89 {"mbr", LEGACY_MBR_PARTITION_GUID
},
90 {"msft", PARTITION_MSFT_RESERVED_GUID
},
91 {"data", PARTITION_BASIC_DATA_GUID
},
92 {"linux", PARTITION_LINUX_FILE_SYSTEM_DATA_GUID
},
93 {"raid", PARTITION_LINUX_RAID_GUID
},
94 {"swap", PARTITION_LINUX_SWAP_GUID
},
95 {"lvm", PARTITION_LINUX_LVM_GUID
}
99 * uuid_guid_get_bin() - this function get GUID bin for string
101 * @param guid_str - pointer to partition type string
102 * @param guid_bin - pointer to allocated array for big endian output [16B]
104 int uuid_guid_get_bin(const char *guid_str
, unsigned char *guid_bin
)
108 for (i
= 0; i
< ARRAY_SIZE(list_guid
); i
++) {
109 if (!strcmp(list_guid
[i
].string
, guid_str
)) {
110 memcpy(guid_bin
, &list_guid
[i
].guid
, 16);
118 * uuid_guid_get_str() - this function get string for GUID.
120 * @param guid_bin - pointer to string with partition type guid [16B]
121 * @param guid_str - pointer to allocated partition type string [7B]
123 int uuid_guid_get_str(unsigned char *guid_bin
, char *guid_str
)
128 for (i
= 0; i
< ARRAY_SIZE(list_guid
); i
++) {
129 if (!memcmp(list_guid
[i
].guid
.b
, guid_bin
, 16)) {
130 strcpy(guid_str
, list_guid
[i
].string
);
139 * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
141 * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
142 * @param uuid_bin - pointer to allocated array for big endian output [16B]
143 * @str_format - UUID string format: 0 - UUID; 1 - GUID
145 int uuid_str_to_bin(char *uuid_str
, unsigned char *uuid_bin
, int str_format
)
151 if (!uuid_str_valid(uuid_str
)) {
152 #ifdef CONFIG_PARTITION_TYPE_GUID
153 if (!uuid_guid_get_bin(uuid_str
, uuid_bin
))
159 if (str_format
== UUID_STR_FORMAT_STD
) {
160 tmp32
= cpu_to_be32(simple_strtoul(uuid_str
, NULL
, 16));
161 memcpy(uuid_bin
, &tmp32
, 4);
163 tmp16
= cpu_to_be16(simple_strtoul(uuid_str
+ 9, NULL
, 16));
164 memcpy(uuid_bin
+ 4, &tmp16
, 2);
166 tmp16
= cpu_to_be16(simple_strtoul(uuid_str
+ 14, NULL
, 16));
167 memcpy(uuid_bin
+ 6, &tmp16
, 2);
169 tmp32
= cpu_to_le32(simple_strtoul(uuid_str
, NULL
, 16));
170 memcpy(uuid_bin
, &tmp32
, 4);
172 tmp16
= cpu_to_le16(simple_strtoul(uuid_str
+ 9, NULL
, 16));
173 memcpy(uuid_bin
+ 4, &tmp16
, 2);
175 tmp16
= cpu_to_le16(simple_strtoul(uuid_str
+ 14, NULL
, 16));
176 memcpy(uuid_bin
+ 6, &tmp16
, 2);
179 tmp16
= cpu_to_be16(simple_strtoul(uuid_str
+ 19, NULL
, 16));
180 memcpy(uuid_bin
+ 8, &tmp16
, 2);
182 tmp64
= cpu_to_be64(simple_strtoull(uuid_str
+ 24, NULL
, 16));
183 memcpy(uuid_bin
+ 10, (char *)&tmp64
+ 2, 6);
189 * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
191 * @param uuid_bin: pointer to binary data of UUID (big endian) [16B]
192 * @param uuid_str: pointer to allocated array for output string [37B]
193 * @str_format: bit 0: 0 - UUID; 1 - GUID
194 * bit 1: 0 - lower case; 2 - upper case
196 void uuid_bin_to_str(unsigned char *uuid_bin
, char *uuid_str
, int str_format
)
198 const u8 uuid_char_order
[UUID_BIN_LEN
] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
199 9, 10, 11, 12, 13, 14, 15};
200 const u8 guid_char_order
[UUID_BIN_LEN
] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
201 9, 10, 11, 12, 13, 14, 15};
202 const u8
*char_order
;
207 * UUID and GUID bin data - always in big endian:
211 if (str_format
& UUID_STR_FORMAT_GUID
)
212 char_order
= guid_char_order
;
214 char_order
= uuid_char_order
;
215 if (str_format
& UUID_STR_UPPER_CASE
)
220 for (i
= 0; i
< 16; i
++) {
221 sprintf(uuid_str
, format
, uuid_bin
[char_order
[i
]]);
235 * gen_rand_uuid() - this function generates a random binary UUID version 4.
236 * In this version all fields beside 4 bits of version and
237 * 2 bits of variant are randomly generated.
239 * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
241 #if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID)
242 void gen_rand_uuid(unsigned char *uuid_bin
)
245 struct uuid
*uuid
= (struct uuid
*)ptr
;
248 srand(get_ticks() + rand());
250 /* Set all fields randomly */
251 for (i
= 0; i
< 4; i
++)
254 clrsetbits_be16(&uuid
->time_hi_and_version
,
256 UUID_VERSION
<< UUID_VERSION_SHIFT
);
258 clrsetbits_8(&uuid
->clock_seq_hi_and_reserved
,
260 UUID_VARIANT
<< UUID_VARIANT_SHIFT
);
262 memcpy(uuid_bin
, uuid
, 16);
266 * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
267 * formats UUID or GUID.
269 * @param uuid_str - pointer to allocated array [37B].
270 * @param - uuid output type: UUID - 0, GUID - 1
272 void gen_rand_uuid_str(char *uuid_str
, int str_format
)
274 unsigned char uuid_bin
[UUID_BIN_LEN
];
276 /* Generate UUID (big endian) */
277 gen_rand_uuid(uuid_bin
);
279 /* Convert UUID bin to UUID or GUID formated STRING */
280 uuid_bin_to_str(uuid_bin
, uuid_str
, str_format
);
283 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CMD_UUID)
284 int do_uuid(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
286 char uuid
[UUID_STR_LEN
+ 1];
289 if (!strcmp(argv
[0], "uuid"))
290 str_format
= UUID_STR_FORMAT_STD
;
292 str_format
= UUID_STR_FORMAT_GUID
;
295 return CMD_RET_USAGE
;
297 gen_rand_uuid_str(uuid
, str_format
);
300 printf("%s\n", uuid
);
302 env_set(argv
[1], uuid
);
304 return CMD_RET_SUCCESS
;
307 U_BOOT_CMD(uuid
, CONFIG_SYS_MAXARGS
, 1, do_uuid
,
308 "UUID - generate random Universally Unique Identifier",
311 "varname: for set result in a environment variable\n"
315 U_BOOT_CMD(guid
, CONFIG_SYS_MAXARGS
, 1, do_uuid
,
316 "GUID - generate Globally Unique Identifier based on random UUID",
319 "varname: for set result in a environment variable\n"
322 #endif /* CONFIG_CMD_UUID */
323 #endif /* CONFIG_RANDOM_UUID || CONFIG_CMD_UUID */