1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2014 Samsung Electronics
13 #include <linux/bitops.h>
14 #include <linux/kconfig.h>
17 * UUID - Universally Unique IDentifier - 128 bits unique number.
18 * There are 5 versions and one variant of UUID defined by RFC4122
19 * specification. A UUID contains a set of fields. The set varies
20 * depending on the version of the UUID, as shown below:
21 * - time, MAC address(v1),
23 * - MD5 of name or URL(v3),
25 * - SHA-1 of name or URL(v5),
28 * timestamp - 60-bit: time_low, time_mid, time_hi_and_version
29 * version - 4 bit (bit 4 through 7 of the time_hi_and_version)
30 * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
31 * variant: - bit 6 and 7 of clock_seq_hi_and_reserved
34 * source: https://www.ietf.org/rfc/rfc4122.txt
36 * UUID binary format (16 bytes):
38 * 4B-2B-2B-2B-6B (big endian - network byte order)
40 * UUID string is 36 length of characters (36 bytes):
43 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
46 * where x is a hexadecimal character. Fields are separated by '-'s.
47 * When converting to a binary UUID, le means the field should be converted
48 * to little endian and be means it should be converted to big endian.
50 * UUID is also used as GUID (Globally Unique Identifier) with the same format
51 * but with some fields stored in little endian.
55 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
58 * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
61 /* This is structure is in big-endian */
63 unsigned int time_low;
64 unsigned short time_mid;
65 unsigned short time_hi_and_version;
66 unsigned char clock_seq_hi_and_reserved;
67 unsigned char clock_seq_low;
68 unsigned char node[6];
71 /* Bits of a bitmask specifying the output format for GUIDs */
72 #define UUID_STR_FORMAT_STD 0
73 #define UUID_STR_FORMAT_GUID 0x1
74 #define UUID_STR_UPPER_CASE 0x2
76 /* Use UUID_STR_LEN + 1 for string space */
77 #define UUID_STR_LEN 36
78 #define UUID_BIN_LEN sizeof(struct uuid)
80 #define UUID_VERSION_MASK 0xf000
81 #define UUID_VERSION_SHIFT 12
82 #define UUID_VERSION 0x4
84 #define UUID_VARIANT_MASK 0xc0
85 #define UUID_VARIANT_SHIFT 7
86 #define UUID_VARIANT 0x1
88 int uuid_str_valid(const char *uuid);
91 * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
93 * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
94 * @param uuid_bin - pointer to allocated array for big endian output [16B]
95 * @str_format - UUID string format: 0 - UUID; 1 - GUID
96 * Return: 0 if OK, -EINVAL if the string is not a valid UUID
98 int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
102 * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
104 * @param uuid_bin: pointer to binary data of UUID (big endian) [16B]
105 * @param uuid_str: pointer to allocated array for output string [37B]
106 * @str_format: bit 0: 0 - UUID; 1 - GUID
107 * bit 1: 0 - lower case; 2 - upper case
109 void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str,
113 * uuid_guid_get_bin() - this function get GUID bin for string
115 * @param guid_str - pointer to partition type string
116 * @param guid_bin - pointer to allocated array for big endian output [16B]
118 int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin);
121 * uuid_guid_get_str() - this function get string for GUID.
123 * @param guid_bin - pointer to string with partition type guid [16B]
125 * Returns NULL if the type GUID is not known.
127 const char *uuid_guid_get_str(const unsigned char *guid_bin);
130 * gen_rand_uuid() - this function generates a random binary UUID version 4.
131 * In this version all fields beside 4 bits of version and
132 * 2 bits of variant are randomly generated.
134 * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
136 void gen_rand_uuid(unsigned char *uuid_bin);
139 * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
140 * formats UUID or GUID.
142 * @param uuid_str - pointer to allocated array [37B].
143 * @param - uuid output type: UUID - 0, GUID - 1
145 void gen_rand_uuid_str(char *uuid_str, int str_format);
150 * gen_v5_guid() - generate little endian v5 GUID from namespace and other seed data.
152 * @namespace: pointer to UUID namespace salt
153 * @guid: pointer to allocated GUID output
154 * @...: NULL terminated list of seed data as pairs of pointers
155 * to data and their lengths
157 void gen_v5_guid(const struct uuid *namespace, struct efi_guid *guid, ...);
160 * uuid_str_to_le_bin() - Convert string UUID to little endian binary data.
161 * @uuid_str: pointer to UUID string
162 * @uuid_bin: pointer to allocated array for little endian output [16B]
164 * UUID string is 36 characters (36 bytes):
166 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
168 * where x is a hexadecimal character. Fields are separated by '-'s.
169 * When converting to a little endian binary UUID, the string fields are reversed.
173 * uuid_bin filled with little endian UUID data
174 * On success 0 is returned. Otherwise, failure code.
176 int uuid_str_to_le_bin(const char *uuid_str, unsigned char *uuid_bin);