1 /* 2 * EAP server/peer: EAP-PSK shared routines 3 * Copyright (c) 2004-2006, 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 #ifndef EAP_PSK_COMMON_H 16 #define EAP_PSK_COMMON_H 17 18 19 #define EAP_PSK_RAND_LEN 16 20 #define EAP_PSK_MAC_LEN 16 21 #define EAP_PSK_TEK_LEN 16 22 #define EAP_PSK_PSK_LEN 16 23 #define EAP_PSK_AK_LEN 16 24 #define EAP_PSK_KDK_LEN 16 25 26 #define EAP_PSK_R_FLAG_CONT 1 27 #define EAP_PSK_R_FLAG_DONE_SUCCESS 2 28 #define EAP_PSK_R_FLAG_DONE_FAILURE 3 29 #define EAP_PSK_E_FLAG 0x20 30 31 #define EAP_PSK_FLAGS_GET_T(flags) (((flags) & 0xc0) >> 6) 32 #define EAP_PSK_FLAGS_SET_T(t) ((u8) (t) << 6) 33 34 #ifdef _MSC_VER 35 #pragma pack(push, 1) 36 #endif /* _MSC_VER */ 37 38 /* Shared prefix for all EAP-PSK frames */ 39 struct eap_psk_hdr { 40 u8 code; 41 u8 identifier; 42 u16 length; /* including code, identifier, and length */ 43 u8 type; /* EAP_TYPE_PSK */ 44 u8 flags; 45 } STRUCT_PACKED; 46 47 /* EAP-PSK First Message (AS -> Supplicant) */ 48 struct eap_psk_hdr_1 { 49 u8 code; 50 u8 identifier; 51 u16 length; /* including code, identifier, and length */ 52 u8 type; /* EAP_TYPE_PSK */ 53 u8 flags; 54 u8 rand_s[EAP_PSK_RAND_LEN]; 55 /* Followed by variable length ID_S */ 56 } STRUCT_PACKED; 57 58 /* EAP-PSK Second Message (Supplicant -> AS) */ 59 struct eap_psk_hdr_2 { 60 u8 code; 61 u8 identifier; 62 u16 length; /* including code, identifier, and length */ 63 u8 type; /* EAP_TYPE_PSK */ 64 u8 flags; 65 u8 rand_s[EAP_PSK_RAND_LEN]; 66 u8 rand_p[EAP_PSK_RAND_LEN]; 67 u8 mac_p[EAP_PSK_MAC_LEN]; 68 /* Followed by variable length ID_P */ 69 } STRUCT_PACKED; 70 71 /* EAP-PSK Third Message (AS -> Supplicant) */ 72 struct eap_psk_hdr_3 { 73 u8 code; 74 u8 identifier; 75 u16 length; /* including code, identifier, and length */ 76 u8 type; /* EAP_TYPE_PSK */ 77 u8 flags; 78 u8 rand_s[EAP_PSK_RAND_LEN]; 79 u8 mac_s[EAP_PSK_MAC_LEN]; 80 /* Followed by variable length PCHANNEL */ 81 } STRUCT_PACKED; 82 83 /* EAP-PSK Fourth Message (Supplicant -> AS) */ 84 struct eap_psk_hdr_4 { 85 u8 code; 86 u8 identifier; 87 u16 length; /* including code, identifier, and length */ 88 u8 type; /* EAP_TYPE_PSK */ 89 u8 flags; 90 u8 rand_s[EAP_PSK_RAND_LEN]; 91 /* Followed by variable length PCHANNEL */ 92 } STRUCT_PACKED; 93 94 #ifdef _MSC_VER 95 #pragma pack(pop) 96 #endif /* _MSC_VER */ 97 98 99 void eap_psk_key_setup(const u8 *psk, u8 *ak, u8 *kdk); 100 void eap_psk_derive_keys(const u8 *kdk, const u8 *rand_p, u8 *tek, u8 *msk, 101 u8 *emsk); 102 103 #endif /* EAP_PSK_COMMON_H */ 104
