1 /* 2 * Copyright 2011 Calxeda, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <linux/ctype.h> 8 #include <errno.h> 9 #include <common.h> 10 #include <asm/io.h> 11 #include <part_efi.h> 12 #include <malloc.h> 13 14 /* 15 * UUID - Universally Unique IDentifier - 128 bits unique number. 16 * There are 5 versions and one variant of UUID defined by RFC4122 17 * specification. Depends on version uuid number base on a time, 18 * host name, MAC address or random data. 19 * 20 * UUID binary format (16 bytes): 21 * 22 * 4B-2B-2B-2B-6B (big endian - network byte order) 23 * 24 * UUID string is 36 length of characters (36 bytes): 25 * 26 * 0 9 14 19 24 27 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 28 * be be be be be 29 * 30 * where x is a hexadecimal character. Fields are separated by '-'s. 31 * When converting to a binary UUID, le means the field should be converted 32 * to little endian and be means it should be converted to big endian. 33 * 34 * UUID is also used as GUID (Globally Unique Identifier) with the same binary 35 * format but it differs in string format like below. 36 * 37 * GUID: 38 * 0 9 14 19 24 39 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 40 * le le le be be 41 * 42 * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id. 43 */ 44 int uuid_str_valid(const char *uuid) 45 { 46 int i, valid; 47 48 if (uuid == NULL) 49 return 0; 50 51 for (i = 0, valid = 1; uuid[i] && valid; i++) { 52 switch (i) { 53 case 8: case 13: case 18: case 23: 54 valid = (uuid[i] == '-'); 55 break; 56 default: 57 valid = isxdigit(uuid[i]); 58 break; 59 } 60 } 61 62 if (i != UUID_STR_LEN || !valid) 63 return 0; 64 65 return 1; 66 } 67 68 /* 69 * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data. 70 * 71 * @param uuid_str - pointer to UUID or GUID string [37B] 72 * @param uuid_bin - pointer to allocated array for big endian output [16B] 73 * @str_format - UUID string format: 0 - UUID; 1 - GUID 74 */ 75 int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format) 76 { 77 uint16_t tmp16; 78 uint32_t tmp32; 79 uint64_t tmp64; 80 81 if (!uuid_str_valid(uuid_str)) 82 return -EINVAL; 83 84 if (str_format == UUID_STR_FORMAT_STD) { 85 tmp32 = cpu_to_be32(simple_strtoul(uuid_str, NULL, 16)); 86 memcpy(uuid_bin, &tmp32, 4); 87 88 tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 9, NULL, 16)); 89 memcpy(uuid_bin + 4, &tmp16, 2); 90 91 tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 14, NULL, 16)); 92 memcpy(uuid_bin + 6, &tmp16, 2); 93 } else { 94 tmp32 = cpu_to_le32(simple_strtoul(uuid_str, NULL, 16)); 95 memcpy(uuid_bin, &tmp32, 4); 96 97 tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 9, NULL, 16)); 98 memcpy(uuid_bin + 4, &tmp16, 2); 99 100 tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 14, NULL, 16)); 101 memcpy(uuid_bin + 6, &tmp16, 2); 102 } 103 104 tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 19, NULL, 16)); 105 memcpy(uuid_bin + 8, &tmp16, 2); 106 107 tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16)); 108 memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6); 109 110 return 0; 111 } 112 113 /* 114 * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID. 115 * 116 * @param uuid_bin - pointer to binary data of UUID (big endian) [16B] 117 * @param uuid_str - pointer to allocated array for output string [37B] 118 * @str_format - UUID string format: 0 - UUID; 1 - GUID 119 */ 120 void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format) 121 { 122 const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 123 9, 10, 11, 12, 13, 14, 15}; 124 const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 125 9, 10, 11, 12, 13, 14, 15}; 126 const u8 *char_order; 127 int i; 128 129 /* 130 * UUID and GUID bin data - always in big endian: 131 * 4B-2B-2B-2B-6B 132 * be be be be be 133 */ 134 if (str_format == UUID_STR_FORMAT_STD) 135 char_order = uuid_char_order; 136 else 137 char_order = guid_char_order; 138 139 for (i = 0; i < 16; i++) { 140 sprintf(uuid_str, "%02x", uuid_bin[char_order[i]]); 141 uuid_str += 2; 142 switch (i) { 143 case 3: 144 case 5: 145 case 7: 146 case 9: 147 *uuid_str++ = '-'; 148 break; 149 } 150 } 151 } 152