eap_aka.c

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/*
 * EAP peer method: EAP-AKA (RFC 4187) and EAP-AKA' (draft-arkko-eap-aka-kdf)
 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "pcsc_funcs.h"
#include "crypto/crypto.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "crypto/milenage.h"
#include "eap_common/eap_sim_common.h"
#include "eap_config.h"
#include "eap_i.h"


struct eap_aka_data {
        u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN];
        size_t res_len;
        u8 nonce_s[EAP_SIM_NONCE_S_LEN];
        u8 mk[EAP_SIM_MK_LEN];
        u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
        u8 k_encr[EAP_SIM_K_ENCR_LEN];
        u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
        u8 msk[EAP_SIM_KEYING_DATA_LEN];
        u8 emsk[EAP_EMSK_LEN];
        u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
        u8 auts[EAP_AKA_AUTS_LEN];

        int num_id_req, num_notification;
        u8 *pseudonym;
        size_t pseudonym_len;
        u8 *reauth_id;
        size_t reauth_id_len;
        int reauth;
        unsigned int counter, counter_too_small;
        u8 *last_eap_identity;
        size_t last_eap_identity_len;
        enum {
                CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
        } state;

        struct wpabuf *id_msgs;
        int prev_id;
        int result_ind, use_result_ind;
        u8 eap_method;
        u8 *network_name;
        size_t network_name_len;
        u16 kdf;
        int kdf_negotiation;
};


#ifndef CONFIG_NO_STDOUT_DEBUG
static const char * eap_aka_state_txt(int state)
{
        switch (state) {
        case CONTINUE:
                return "CONTINUE";
        case RESULT_SUCCESS:
                return "RESULT_SUCCESS";
        case RESULT_FAILURE:
                return "RESULT_FAILURE";
        case SUCCESS:
                return "SUCCESS";
        case FAILURE:
                return "FAILURE";
        default:
                return "?";
        }
}
#endif /* CONFIG_NO_STDOUT_DEBUG */


static void eap_aka_state(struct eap_aka_data *data, int state)
{
        wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
                   eap_aka_state_txt(data->state),
                   eap_aka_state_txt(state));
        data->state = state;
}


static void * eap_aka_init(struct eap_sm *sm)
{
        struct eap_aka_data *data;
        const char *phase1 = eap_get_config_phase1(sm);

        data = os_zalloc(sizeof(*data));
        if (data == NULL)
                return NULL;

        data->eap_method = EAP_TYPE_AKA;

        eap_aka_state(data, CONTINUE);
        data->prev_id = -1;

        data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;

        return data;
}


#ifdef EAP_AKA_PRIME
static void * eap_aka_prime_init(struct eap_sm *sm)
{
        struct eap_aka_data *data = eap_aka_init(sm);
        if (data == NULL)
                return NULL;
        data->eap_method = EAP_TYPE_AKA_PRIME;
        return data;
}
#endif /* EAP_AKA_PRIME */


static void eap_aka_deinit(struct eap_sm *sm, void *priv)
{
        struct eap_aka_data *data = priv;
        if (data) {
                os_free(data->pseudonym);
                os_free(data->reauth_id);
                os_free(data->last_eap_identity);
                wpabuf_free(data->id_msgs);
                os_free(data->network_name);
                os_free(data);
        }
}


static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
{
        struct eap_peer_config *conf;

        wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");

        conf = eap_get_config(sm);
        if (conf == NULL)
                return -1;
        if (conf->pcsc) {
                return scard_umts_auth(sm->scard_ctx, data->rand,
                                       data->autn, data->res, &data->res_len,
                                       data->ik, data->ck, data->auts);
        }

#ifdef CONFIG_USIM_SIMULATOR
        if (conf->password) {
                u8 opc[16], k[16], sqn[6];
                const char *pos;
                wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
                           "implementation for UMTS authentication");
                if (conf->password_len < 78) {
                        wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
                                   "password");
                        return -1;
                }
                pos = (const char *) conf->password;
                if (hexstr2bin(pos, k, 16))
                        return -1;
                pos += 32;
                if (*pos != ':')
                        return -1;
                pos++;

                if (hexstr2bin(pos, opc, 16))
                        return -1;
                pos += 32;
                if (*pos != ':')
                        return -1;
                pos++;

                if (hexstr2bin(pos, sqn, 6))
                        return -1;

                return milenage_check(opc, k, sqn, data->rand, data->autn,
                                      data->ik, data->ck,
                                      data->res, &data->res_len, data->auts);
        }
#endif /* CONFIG_USIM_SIMULATOR */

#ifdef CONFIG_USIM_HARDCODED
        wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
                   "testing");

        /* These hardcoded Kc and SRES values are used for testing.
         * Could consider making them configurable. */
        os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
        data->res_len = EAP_AKA_RES_MAX_LEN;
        os_memset(data->ik, '3', EAP_AKA_IK_LEN);
        os_memset(data->ck, '4', EAP_AKA_CK_LEN);
        {
                u8 autn[EAP_AKA_AUTN_LEN];
                os_memset(autn, '1', EAP_AKA_AUTN_LEN);
                if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
                        wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
                                   "with expected value");
                        return -1;
                }
        }
#if 0
        {
                static int test_resync = 1;
                if (test_resync) {
                        /* Test Resynchronization */
                        test_resync = 0;
                        return -2;
                }
        }
#endif
        return 0;

#else /* CONFIG_USIM_HARDCODED */

        wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorith "
                   "enabled");
        return -1;

#endif /* CONFIG_USIM_HARDCODED */
}


#define CLEAR_PSEUDONYM 0x01
#define CLEAR_REAUTH_ID 0x02
#define CLEAR_EAP_ID    0x04

static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
{
        wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old%s%s%s",
                   id & CLEAR_PSEUDONYM ? " pseudonym" : "",
                   id & CLEAR_REAUTH_ID ? " reauth_id" : "",
                   id & CLEAR_EAP_ID ? " eap_id" : "");
        if (id & CLEAR_PSEUDONYM) {
                os_free(data->pseudonym);
                data->pseudonym = NULL;
                data->pseudonym_len = 0;
        }
        if (id & CLEAR_REAUTH_ID) {
                os_free(data->reauth_id);
                data->reauth_id = NULL;
                data->reauth_id_len = 0;
        }
        if (id & CLEAR_EAP_ID) {
                os_free(data->last_eap_identity);
                data->last_eap_identity = NULL;
                data->last_eap_identity_len = 0;
        }
}


static int eap_aka_learn_ids(struct eap_aka_data *data,
                             struct eap_sim_attrs *attr)
{
        if (attr->next_pseudonym) {
                os_free(data->pseudonym);
                data->pseudonym = os_malloc(attr->next_pseudonym_len);
                if (data->pseudonym == NULL) {
                        wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
                                   "next pseudonym");
                        return -1;
                }
                os_memcpy(data->pseudonym, attr->next_pseudonym,
                          attr->next_pseudonym_len);
                data->pseudonym_len = attr->next_pseudonym_len;
                wpa_hexdump_ascii(MSG_DEBUG,
                                  "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
                                  data->pseudonym,
                                  data->pseudonym_len);
        }

        if (attr->next_reauth_id) {
                os_free(data->reauth_id);
                data->reauth_id = os_malloc(attr->next_reauth_id_len);
                if (data->reauth_id == NULL) {
                        wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
                                   "next reauth_id");
                        return -1;
                }
                os_memcpy(data->reauth_id, attr->next_reauth_id,
                          attr->next_reauth_id_len);
                data->reauth_id_len = attr->next_reauth_id_len;
                wpa_hexdump_ascii(MSG_DEBUG,
                                  "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
                                  data->reauth_id,
                                  data->reauth_id_len);
        }

        return 0;
}


static int eap_aka_add_id_msg(struct eap_aka_data *data,
                              const struct wpabuf *msg)
{
        if (msg == NULL)
                return -1;

        if (data->id_msgs == NULL) {
                data->id_msgs = wpabuf_dup(msg);
                return data->id_msgs == NULL ? -1 : 0;
        }

        if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
                return -1;
        wpabuf_put_buf(data->id_msgs, msg);

        return 0;
}


static void eap_aka_add_checkcode(struct eap_aka_data *data,
                                  struct eap_sim_msg *msg)
{
        const u8 *addr;
        size_t len;
        u8 hash[SHA256_MAC_LEN];

        wpa_printf(MSG_DEBUG, "   AT_CHECKCODE");

        if (data->id_msgs == NULL) {
                /*
                 * No EAP-AKA/Identity packets were exchanged - send empty
                 * checkcode.
                 */
                eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
                return;
        }

        /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
        addr = wpabuf_head(data->id_msgs);
        len = wpabuf_len(data->id_msgs);
        wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
#ifdef EAP_AKA_PRIME
        if (data->eap_method == EAP_TYPE_AKA_PRIME)
                sha256_vector(1, &addr, &len, hash);
        else
#endif /* EAP_AKA_PRIME */
                sha1_vector(1, &addr, &len, hash);

        eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
                        data->eap_method == EAP_TYPE_AKA_PRIME ?
                        EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
}


static int eap_aka_verify_checkcode(struct eap_aka_data *data,
                                    const u8 *checkcode, size_t checkcode_len)
{
        const u8 *addr;
        size_t len;
        u8 hash[SHA256_MAC_LEN];
        size_t hash_len;

        if (checkcode == NULL)
                return -1;

        if (data->id_msgs == NULL) {
                if (checkcode_len != 0) {
                        wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
                                   "indicates that AKA/Identity messages were "
                                   "used, but they were not");
                        return -1;
                }
                return 0;
        }

        hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
                EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;

        if (checkcode_len != hash_len) {
                wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
                           "indicates that AKA/Identity message were not "
                           "used, but they were");
                return -1;
        }

        /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
        addr = wpabuf_head(data->id_msgs);
        len = wpabuf_len(data->id_msgs);
#ifdef EAP_AKA_PRIME
        if (data->eap_method == EAP_TYPE_AKA_PRIME)
                sha256_vector(1, &addr, &len, hash);
        else
#endif /* EAP_AKA_PRIME */
                sha1_vector(1, &addr, &len, hash);

        if (os_memcmp(hash, checkcode, hash_len) != 0) {
                wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
                return -1;
        }

        return 0;
}


static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
                                            int err)
{
        struct eap_sim_msg *msg;

        eap_aka_state(data, FAILURE);
        data->num_id_req = 0;
        data->num_notification = 0;

        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_CLIENT_ERROR);
        eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
        return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
                                                     u8 id)
{
        struct eap_sim_msg *msg;

        eap_aka_state(data, FAILURE);
        data->num_id_req = 0;
        data->num_notification = 0;

        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
                   "(id=%d)", id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
        return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_synchronization_failure(
        struct eap_aka_data *data, u8 id)
{
        struct eap_sim_msg *msg;

        data->num_id_req = 0;
        data->num_notification = 0;

        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
                   "(id=%d)", id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
        wpa_printf(MSG_DEBUG, "   AT_AUTS");
        eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
                             EAP_AKA_AUTS_LEN);
        return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
                                                 struct eap_aka_data *data,
                                                 u8 id,
                                                 enum eap_sim_id_req id_req)
{
        const u8 *identity = NULL;
        size_t identity_len = 0;
        struct eap_sim_msg *msg;

        data->reauth = 0;
        if (id_req == ANY_ID && data->reauth_id) {
                identity = data->reauth_id;
                identity_len = data->reauth_id_len;
                data->reauth = 1;
        } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
                   data->pseudonym) {
                identity = data->pseudonym;
                identity_len = data->pseudonym_len;
                eap_aka_clear_identities(data, CLEAR_REAUTH_ID);
        } else if (id_req != NO_ID_REQ) {
                identity = eap_get_config_identity(sm, &identity_len);
                if (identity) {
                        eap_aka_clear_identities(data, CLEAR_PSEUDONYM |
                                                 CLEAR_REAUTH_ID);
                }
        }
        if (id_req != NO_ID_REQ)
                eap_aka_clear_identities(data, CLEAR_EAP_ID);

        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_IDENTITY);

        if (identity) {
                wpa_hexdump_ascii(MSG_DEBUG, "   AT_IDENTITY",
                                  identity, identity_len);
                eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
                                identity, identity_len);
        }

        return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
                                                  u8 id)
{
        struct eap_sim_msg *msg;

        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_CHALLENGE);
        wpa_printf(MSG_DEBUG, "   AT_RES");
        eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
                        data->res, data->res_len);
        eap_aka_add_checkcode(data, msg);
        if (data->use_result_ind) {
                wpa_printf(MSG_DEBUG, "   AT_RESULT_IND");
                eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
        }
        wpa_printf(MSG_DEBUG, "   AT_MAC");
        eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
        return eap_sim_msg_finish(msg, data->k_aut, (u8 *) "", 0);
}


static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
                                               u8 id, int counter_too_small,
                                               const u8 *nonce_s)
{
        struct eap_sim_msg *msg;
        unsigned int counter;

        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
                   id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_REAUTHENTICATION);
        wpa_printf(MSG_DEBUG, "   AT_IV");
        wpa_printf(MSG_DEBUG, "   AT_ENCR_DATA");
        eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);

        if (counter_too_small) {
                wpa_printf(MSG_DEBUG, "   *AT_COUNTER_TOO_SMALL");
                eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
                counter = data->counter_too_small;
        } else
                counter = data->counter;

        wpa_printf(MSG_DEBUG, "   *AT_COUNTER %d", counter);
        eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);

        if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
                           "AT_ENCR_DATA");
                eap_sim_msg_free(msg);
                return NULL;
        }
        eap_aka_add_checkcode(data, msg);
        if (data->use_result_ind) {
                wpa_printf(MSG_DEBUG, "   AT_RESULT_IND");
                eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
        }
        wpa_printf(MSG_DEBUG, "   AT_MAC");
        eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
        return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
                                  EAP_SIM_NONCE_S_LEN);
}


static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
                                                     u8 id, u16 notification)
{
        struct eap_sim_msg *msg;
        u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;

        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_NOTIFICATION);
        if (k_aut && data->reauth) {
                wpa_printf(MSG_DEBUG, "   AT_IV");
                wpa_printf(MSG_DEBUG, "   AT_ENCR_DATA");
                eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
                                           EAP_SIM_AT_ENCR_DATA);
                wpa_printf(MSG_DEBUG, "   *AT_COUNTER %d", data->counter);
                eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
                                NULL, 0);
                if (eap_sim_msg_add_encr_end(msg, data->k_encr,
                                             EAP_SIM_AT_PADDING)) {
                        wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
                                   "AT_ENCR_DATA");
                        eap_sim_msg_free(msg);
                        return NULL;
                }
        }
        if (k_aut) {
                wpa_printf(MSG_DEBUG, "   AT_MAC");
                eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
        }
        return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
}


static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
                                                struct eap_aka_data *data,
                                                u8 id,
                                                const struct wpabuf *reqData,
                                                struct eap_sim_attrs *attr)
{
        int id_error;
        struct wpabuf *buf;

        wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");

        id_error = 0;
        switch (attr->id_req) {
        case NO_ID_REQ:
                break;
        case ANY_ID:
                if (data->num_id_req > 0)
                        id_error++;
                data->num_id_req++;
                break;
        case FULLAUTH_ID:
                if (data->num_id_req > 1)
                        id_error++;
                data->num_id_req++;
                break;
        case PERMANENT_ID:
                if (data->num_id_req > 2)
                        id_error++;
                data->num_id_req++;
                break;
        }
        if (id_error) {
                wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
                           "used within one authentication");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        buf = eap_aka_response_identity(sm, data, id, attr->id_req);

        if (data->prev_id != id) {
                eap_aka_add_id_msg(data, reqData);
                eap_aka_add_id_msg(data, buf);
                data->prev_id = id;
        }

        return buf;
}


static int eap_aka_verify_mac(struct eap_aka_data *data,
                              const struct wpabuf *req,
                              const u8 *mac, const u8 *extra,
                              size_t extra_len)
{
        if (data->eap_method == EAP_TYPE_AKA_PRIME)
                return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
                                                 extra_len);
        return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
}


#ifdef EAP_AKA_PRIME
static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
                                                u8 id, u16 kdf)
{
        struct eap_sim_msg *msg;

        data->kdf_negotiation = 1;
        data->kdf = kdf;
        wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
                   "select)", id);
        msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
                               EAP_AKA_SUBTYPE_CHALLENGE);
        wpa_printf(MSG_DEBUG, "   AT_KDF");
        eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
        return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
                                             u8 id, struct eap_sim_attrs *attr)
{
        size_t i;

        for (i = 0; i < attr->kdf_count; i++) {
                if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
                        return eap_aka_prime_kdf_select(data, id,
                                                        EAP_AKA_PRIME_KDF);
        }

        /* No matching KDF found - fail authentication as if AUTN had been
         * incorrect */
        return eap_aka_authentication_reject(data, id);
}


static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
                                   struct eap_sim_attrs *attr)
{
        size_t i, j;

        if (attr->kdf_count == 0)
                return 0;

        /* The only allowed (and required) duplication of a KDF is the addition
         * of the selected KDF into the beginning of the list. */

        if (data->kdf_negotiation) {
                if (attr->kdf[0] != data->kdf) {
                        wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
                                   "accept the selected KDF");
                        return 0;
                }

                for (i = 1; i < attr->kdf_count; i++) {
                        if (attr->kdf[i] == data->kdf)
                                break;
                }
                if (i == attr->kdf_count &&
                    attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
                        wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
                                   "duplicate the selected KDF");
                        return 0;
                }

                /* TODO: should check that the list is identical to the one
                 * used in the previous Challenge message apart from the added
                 * entry in the beginning. */
        }

        for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
                for (j = i + 1; j < attr->kdf_count; j++) {
                        if (attr->kdf[i] == attr->kdf[j]) {
                                wpa_printf(MSG_WARNING, "EAP-AKA': The server "
                                           "included a duplicated KDF");
                                return 0;
                        }
                }
        }

        return 1;
}
#endif /* EAP_AKA_PRIME */


static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
                                                 struct eap_aka_data *data,
                                                 u8 id,
                                                 const struct wpabuf *reqData,
                                                 struct eap_sim_attrs *attr)
{
        const u8 *identity;
        size_t identity_len;
        int res;
        struct eap_sim_attrs eattr;

        wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");

        if (attr->checkcode &&
            eap_aka_verify_checkcode(data, attr->checkcode,
                                     attr->checkcode_len)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
                           "message");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

#ifdef EAP_AKA_PRIME
        if (data->eap_method == EAP_TYPE_AKA_PRIME) {
                if (!attr->kdf_input || attr->kdf_input_len == 0) {
                        wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
                                   "did not include non-empty AT_KDF_INPUT");
                        /* Fail authentication as if AUTN had been incorrect */
                        return eap_aka_authentication_reject(data, id);
                }
                os_free(data->network_name);
                data->network_name = os_malloc(attr->kdf_input_len);
                if (data->network_name == NULL) {
                        wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
                                   "storing Network Name");
                        return eap_aka_authentication_reject(data, id);
                }
                os_memcpy(data->network_name, attr->kdf_input,
                          attr->kdf_input_len);
                data->network_name_len = attr->kdf_input_len;
                wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
                                  "(AT_KDF_INPUT)",
                                  data->network_name, data->network_name_len);
                /* TODO: check Network Name per 3GPP.33.402 */

                if (!eap_aka_prime_kdf_valid(data, attr))
                        return eap_aka_authentication_reject(data, id);

                if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
                        return eap_aka_prime_kdf_neg(data, id, attr);

                data->kdf = EAP_AKA_PRIME_KDF;
                wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
        }

        if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
                u16 flags = WPA_GET_BE16(attr->bidding);
                if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
                    eap_allowed_method(sm, EAP_VENDOR_IETF,
                                       EAP_TYPE_AKA_PRIME)) {
                        wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
                                   "AKA' to AKA detected");
                        /* Fail authentication as if AUTN had been incorrect */
                        return eap_aka_authentication_reject(data, id);
                }
        }
#endif /* EAP_AKA_PRIME */

        data->reauth = 0;
        if (!attr->mac || !attr->rand || !attr->autn) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
                           "did not include%s%s%s",
                           !attr->mac ? " AT_MAC" : "",
                           !attr->rand ? " AT_RAND" : "",
                           !attr->autn ? " AT_AUTN" : "");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }
        os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
        os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);

        res = eap_aka_umts_auth(sm, data);
        if (res == -1) {
                wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
                           "failed (AUTN)");
                return eap_aka_authentication_reject(data, id);
        } else if (res == -2) {
                wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
                           "failed (AUTN seq# -> AUTS)");
                return eap_aka_synchronization_failure(data, id);
        } else if (res) {
                wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }
#ifdef EAP_AKA_PRIME
        if (data->eap_method == EAP_TYPE_AKA_PRIME) {
                /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
                 * needed 6-octet SQN ^ AK for CK',IK' derivation */
                u16 amf = WPA_GET_BE16(data->autn + 6);
                if (!(amf & 0x8000)) {
                        wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit "
                                   "not set (AMF=0x%4x)", amf);
                        return eap_aka_authentication_reject(data, id);
                }
                eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
                                                 data->autn,
                                                 data->network_name,
                                                 data->network_name_len);
        }
#endif /* EAP_AKA_PRIME */
        if (data->last_eap_identity) {
                identity = data->last_eap_identity;
                identity_len = data->last_eap_identity_len;
        } else if (data->pseudonym) {
                identity = data->pseudonym;
                identity_len = data->pseudonym_len;
        } else
                identity = eap_get_config_identity(sm, &identity_len);
        wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
                          "derivation", identity, identity_len);
        if (data->eap_method == EAP_TYPE_AKA_PRIME) {
                eap_aka_prime_derive_keys(identity, identity_len, data->ik,
                                          data->ck, data->k_encr, data->k_aut,
                                          data->k_re, data->msk, data->emsk);
        } else {
                eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
                                  data->mk);
                eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
                                    data->msk, data->emsk);
        }
        if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
                           "used invalid AT_MAC");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        /* Old reauthentication and pseudonym identities must not be used
         * anymore. In other words, if no new identities are received, full
         * authentication will be used on next reauthentication. */
        eap_aka_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
                                 CLEAR_EAP_ID);

        if (attr->encr_data) {
                u8 *decrypted;
                decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
                                               attr->encr_data_len, attr->iv,
                                               &eattr, 0);
                if (decrypted == NULL) {
                        return eap_aka_client_error(
                                data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
                }
                eap_aka_learn_ids(data, &eattr);
                os_free(decrypted);
        }

        if (data->result_ind && attr->result_ind)
                data->use_result_ind = 1;

        if (data->state != FAILURE && data->state != RESULT_FAILURE) {
                eap_aka_state(data, data->use_result_ind ?
                              RESULT_SUCCESS : SUCCESS);
        }

        data->num_id_req = 0;
        data->num_notification = 0;
        /* RFC 4187 specifies that counter is initialized to one after
         * fullauth, but initializing it to zero makes it easier to implement
         * reauth verification. */
        data->counter = 0;
        return eap_aka_response_challenge(data, id);
}


static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
                                               struct eap_sim_attrs *attr)
{
        struct eap_sim_attrs eattr;
        u8 *decrypted;

        if (attr->encr_data == NULL || attr->iv == NULL) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
                           "reauth did not include encrypted data");
                return -1;
        }

        decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
                                       attr->encr_data_len, attr->iv, &eattr,
                                       0);
        if (decrypted == NULL) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
                           "data from notification message");
                return -1;
        }

        if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
                           "message does not match with counter in reauth "
                           "message");
                os_free(decrypted);
                return -1;
        }

        os_free(decrypted);
        return 0;
}


static int eap_aka_process_notification_auth(struct eap_aka_data *data,
                                             const struct wpabuf *reqData,
                                             struct eap_sim_attrs *attr)
{
        if (attr->mac == NULL) {
                wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
                           "Notification message");
                return -1;
        }

        if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
                           "used invalid AT_MAC");
                return -1;
        }

        if (data->reauth &&
            eap_aka_process_notification_reauth(data, attr)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
                           "message after reauth");
                return -1;
        }

        return 0;
}


static struct wpabuf * eap_aka_process_notification(
        struct eap_sm *sm, struct eap_aka_data *data, u8 id,
        const struct wpabuf *reqData, struct eap_sim_attrs *attr)
{
        wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
        if (data->num_notification > 0) {
                wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
                           "rounds (only one allowed)");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }
        data->num_notification++;
        if (attr->notification == -1) {
                wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
                           "Notification message");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        if ((attr->notification & 0x4000) == 0 &&
            eap_aka_process_notification_auth(data, reqData, attr)) {
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
        if (attr->notification >= 0 && attr->notification < 32768) {
                eap_aka_state(data, FAILURE);
        } else if (attr->notification == EAP_SIM_SUCCESS &&
                   data->state == RESULT_SUCCESS)
                eap_aka_state(data, SUCCESS);
        return eap_aka_response_notification(data, id, attr->notification);
}


static struct wpabuf * eap_aka_process_reauthentication(
        struct eap_sm *sm, struct eap_aka_data *data, u8 id,
        const struct wpabuf *reqData, struct eap_sim_attrs *attr)
{
        struct eap_sim_attrs eattr;
        u8 *decrypted;

        wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");

        if (attr->checkcode &&
            eap_aka_verify_checkcode(data, attr->checkcode,
                                     attr->checkcode_len)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
                           "message");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        if (data->reauth_id == NULL) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
                           "reauthentication, but no reauth_id available");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        data->reauth = 1;
        if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
                           "did not have valid AT_MAC");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        if (attr->encr_data == NULL || attr->iv == NULL) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
                           "message did not include encrypted data");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
                                       attr->encr_data_len, attr->iv, &eattr,
                                       0);
        if (decrypted == NULL) {
                wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
                           "data from reauthentication message");
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        if (eattr.nonce_s == NULL || eattr.counter < 0) {
                wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
                           !eattr.nonce_s ? " AT_NONCE_S" : "",
                           eattr.counter < 0 ? " AT_COUNTER" : "");
                os_free(decrypted);
                return eap_aka_client_error(data, id,
                                            EAP_AKA_UNABLE_TO_PROCESS_PACKET);
        }

        if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
                struct wpabuf *res;
                wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
                           "(%d <= %d)", eattr.counter, data->counter);
                data->counter_too_small = eattr.counter;

                /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
                 * reauth_id must not be used to start a new reauthentication.
                 * However, since it was used in the last EAP-Response-Identity
                 * packet, it has to saved for the following fullauth to be
                 * used in MK derivation. */
                os_free(data->last_eap_identity);
                data->last_eap_identity = data->reauth_id;
                data->last_eap_identity_len = data->reauth_id_len;
                data->reauth_id = NULL;
                data->reauth_id_len = 0;

                res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
                os_free(decrypted);

                return res;
        }
        data->counter = eattr.counter;

        os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
        wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
                    data->nonce_s, EAP_SIM_NONCE_S_LEN);

        if (data->eap_method == EAP_TYPE_AKA_PRIME) {
                eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
                                                 data->reauth_id,
                                                 data->reauth_id_len,
                                                 data->nonce_s,
                                                 data->msk, data->emsk);
        } else {
                eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
                                           data->reauth_id_len,
                                           data->nonce_s, data->mk,
                                           data->msk, data->emsk);
        }
        eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
        eap_aka_learn_ids(data, &eattr);

        if (data->result_ind && attr->result_ind)
                data->use_result_ind = 1;

        if (data->state != FAILURE && data->state != RESULT_FAILURE) {
                eap_aka_state(data, data->use_result_ind ?
                              RESULT_SUCCESS : SUCCESS);
        }

        data->num_id_req = 0;
        data->num_notification = 0;
        if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
                wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
                           "fast reauths performed - force fullauth");
                eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
        }
        os_free(decrypted);
        return eap_aka_response_reauth(data, id, 0, data->nonce_s);
}


static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
                                       struct eap_method_ret *ret,
                                       const struct wpabuf *reqData)
{
        struct eap_aka_data *data = priv;
        const struct eap_hdr *req;
        u8 subtype, id;
        struct wpabuf *res;
        const u8 *pos;
        struct eap_sim_attrs attr;
        size_t len;

        wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
        if (eap_get_config_identity(sm, &len) == NULL) {
                wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
                eap_sm_request_identity(sm);
                ret->ignore = TRUE;
                return NULL;
        }

        pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
                               &len);
        if (pos == NULL || len < 1) {
                ret->ignore = TRUE;
                return NULL;
        }
        req = wpabuf_head(reqData);
        id = req->identifier;
        len = be_to_host16(req->length);

        ret->ignore = FALSE;
        ret->methodState = METHOD_MAY_CONT;
        ret->decision = DECISION_FAIL;
        ret->allowNotifications = TRUE;

        subtype = *pos++;
        wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
        pos += 2; /* Reserved */

        if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
                               data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
                               0)) {
                res = eap_aka_client_error(data, id,
                                           EAP_AKA_UNABLE_TO_PROCESS_PACKET);
                goto done;
        }

        switch (subtype) {
        case EAP_AKA_SUBTYPE_IDENTITY:
                res = eap_aka_process_identity(sm, data, id, reqData, &attr);
                break;
        case EAP_AKA_SUBTYPE_CHALLENGE:
                res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
                break;
        case EAP_AKA_SUBTYPE_NOTIFICATION:
                res = eap_aka_process_notification(sm, data, id, reqData,
                                                   &attr);
                break;
        case EAP_AKA_SUBTYPE_REAUTHENTICATION:
                res = eap_aka_process_reauthentication(sm, data, id, reqData,
                                                       &attr);
                break;
        case EAP_AKA_SUBTYPE_CLIENT_ERROR:
                wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
                res = eap_aka_client_error(data, id,
                                           EAP_AKA_UNABLE_TO_PROCESS_PACKET);
                break;
        default:
                wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
                res = eap_aka_client_error(data, id,
                                           EAP_AKA_UNABLE_TO_PROCESS_PACKET);
                break;
        }

done:
        if (data->state == FAILURE) {
                ret->decision = DECISION_FAIL;
                ret->methodState = METHOD_DONE;
        } else if (data->state == SUCCESS) {
                ret->decision = data->use_result_ind ?
                        DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
                /*
                 * It is possible for the server to reply with AKA
                 * Notification, so we must allow the method to continue and
                 * not only accept EAP-Success at this point.
                 */
                ret->methodState = data->use_result_ind ?
                        METHOD_DONE : METHOD_MAY_CONT;
        } else if (data->state == RESULT_FAILURE)
                ret->methodState = METHOD_CONT;
        else if (data->state == RESULT_SUCCESS)
                ret->methodState = METHOD_CONT;

        if (ret->methodState == METHOD_DONE) {
                ret->allowNotifications = FALSE;
        }

        return res;
}


static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
{
        struct eap_aka_data *data = priv;
        return data->pseudonym || data->reauth_id;
}


static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
        struct eap_aka_data *data = priv;
        eap_aka_clear_identities(data, CLEAR_EAP_ID);
        data->prev_id = -1;
        wpabuf_free(data->id_msgs);
        data->id_msgs = NULL;
        data->use_result_ind = 0;
        data->kdf_negotiation = 0;
}


static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
{
        struct eap_aka_data *data = priv;
        data->num_id_req = 0;
        data->num_notification = 0;
        eap_aka_state(data, CONTINUE);
        return priv;
}


static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
                                       size_t *len)
{
        struct eap_aka_data *data = priv;

        if (data->reauth_id) {
                *len = data->reauth_id_len;
                return data->reauth_id;
        }

        if (data->pseudonym) {
                *len = data->pseudonym_len;
                return data->pseudonym;
        }

        return NULL;
}


static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
{
        struct eap_aka_data *data = priv;
        return data->state == SUCCESS;
}


static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
        struct eap_aka_data *data = priv;
        u8 *key;

        if (data->state != SUCCESS)
                return NULL;

        key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
        if (key == NULL)
                return NULL;

        *len = EAP_SIM_KEYING_DATA_LEN;
        os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);

        return key;
}


static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
        struct eap_aka_data *data = priv;
        u8 *key;

        if (data->state != SUCCESS)
                return NULL;

        key = os_malloc(EAP_EMSK_LEN);
        if (key == NULL)
                return NULL;

        *len = EAP_EMSK_LEN;
        os_memcpy(key, data->emsk, EAP_EMSK_LEN);

        return key;
}


int eap_peer_aka_register(void)
{
        struct eap_method *eap;
        int ret;

        eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
                                    EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
        if (eap == NULL)
                return -1;

        eap->init = eap_aka_init;
        eap->deinit = eap_aka_deinit;
        eap->process = eap_aka_process;
        eap->isKeyAvailable = eap_aka_isKeyAvailable;
        eap->getKey = eap_aka_getKey;
        eap->has_reauth_data = eap_aka_has_reauth_data;
        eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
        eap->init_for_reauth = eap_aka_init_for_reauth;
        eap->get_identity = eap_aka_get_identity;
        eap->get_emsk = eap_aka_get_emsk;

        ret = eap_peer_method_register(eap);
        if (ret)
                eap_peer_method_free(eap);
        return ret;
}


#ifdef EAP_AKA_PRIME
int eap_peer_aka_prime_register(void)
{
        struct eap_method *eap;
        int ret;

        eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
                                    EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
                                    "AKA'");
        if (eap == NULL)
                return -1;

        eap->init = eap_aka_prime_init;
        eap->deinit = eap_aka_deinit;
        eap->process = eap_aka_process;
        eap->isKeyAvailable = eap_aka_isKeyAvailable;
        eap->getKey = eap_aka_getKey;
        eap->has_reauth_data = eap_aka_has_reauth_data;
        eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
        eap->init_for_reauth = eap_aka_init_for_reauth;
        eap->get_identity = eap_aka_get_identity;
        eap->get_emsk = eap_aka_get_emsk;

        ret = eap_peer_method_register(eap);
        if (ret)
                eap_peer_method_free(eap);

        return ret;
}
#endif /* EAP_AKA_PRIME */