1 /* 2 * Universally Unique IDentifier (UUID) 3 * Copyright (c) 2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "crypto/crypto.h" 19 #include "crypto/sha1.h" 20 #include "uuid.h" 21 22 int uuid_str2bin(const char *str, u8 *bin) 23 { 24 const char *pos; 25 u8 *opos; 26 27 pos = str; 28 opos = bin; 29 30 if (hexstr2bin(pos, opos, 4)) 31 return -1; 32 pos += 8; 33 opos += 4; 34 35 if (*pos++ != '-' || hexstr2bin(pos, opos, 2)) 36 return -1; 37 pos += 4; 38 opos += 2; 39 40 if (*pos++ != '-' || hexstr2bin(pos, opos, 2)) 41 return -1; 42 pos += 4; 43 opos += 2; 44 45 if (*pos++ != '-' || hexstr2bin(pos, opos, 2)) 46 return -1; 47 pos += 4; 48 opos += 2; 49 50 if (*pos++ != '-' || hexstr2bin(pos, opos, 6)) 51 return -1; 52 53 return 0; 54 } 55 56 57 int uuid_bin2str(const u8 *bin, char *str, size_t max_len) 58 { 59 int len; 60 len = os_snprintf(str, max_len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-" 61 "%02x%02x-%02x%02x%02x%02x%02x%02x", 62 bin[0], bin[1], bin[2], bin[3], 63 bin[4], bin[5], bin[6], bin[7], 64 bin[8], bin[9], bin[10], bin[11], 65 bin[12], bin[13], bin[14], bin[15]); 66 if (len < 0 || (size_t) len >= max_len) 67 return -1; 68 return 0; 69 } 70 71 72 int is_nil_uuid(const u8 *uuid) 73 { 74 int i; 75 for (i = 0; i < UUID_LEN; i++) 76 if (uuid[i]) 77 return 0; 78 return 1; 79 } 80 81 82 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid) 83 { 84 const u8 *addr[2]; 85 size_t len[2]; 86 u8 hash[SHA1_MAC_LEN]; 87 u8 nsid[16] = { 88 0x52, 0x64, 0x80, 0xf8, 89 0xc9, 0x9b, 90 0x4b, 0xe5, 91 0xa6, 0x55, 92 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84 93 }; 94 95 addr[0] = nsid; 96 len[0] = sizeof(nsid); 97 addr[1] = mac_addr; 98 len[1] = 6; 99 sha1_vector(2, addr, len, hash); 100 os_memcpy(uuid, hash, 16); 101 102 /* Version: 5 = named-based version using SHA-1 */ 103 uuid[6] = (5 << 4) | (uuid[6] & 0x0f); 104 105 /* Variant specified in RFC 4122 */ 106 uuid[8] = 0x80 | (uuid[8] & 0x3f); 107 } 108
