/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.net.eap.test.message;

import static com.android.internal.net.TestUtils.hexStringToByteArray;
import static com.android.internal.net.eap.test.message.simaka.attributes.EapTestAttributeDefinitions.AT_VERSION_LIST_DATA;
import static com.android.internal.net.eap.test.message.simaka.attributes.EapTestAttributeDefinitions.IDENTITY_STRING;
import static com.android.internal.net.eap.test.message.simaka.attributes.EapTestAttributeDefinitions.NONCE_MT_STRING;
import static com.android.internal.net.eap.test.message.simaka.attributes.EapTestAttributeDefinitions.RAND_1;
import static com.android.internal.net.eap.test.message.simaka.attributes.EapTestAttributeDefinitions.RAND_2;
import static com.android.internal.net.eap.test.message.simaka.attributes.EapTestAttributeDefinitions.RES;

/**
 * EapTestMessageDefinitions provides byte[] encodings of commonly used EAP Messages.
 *
 * @see <a href="https://tools.ietf.org/html/rfc3748#section-4">RFC 3748, Extensible Authentication
 * Protocol (EAP)</a>
 */
public class EapTestMessageDefinitions {
    public static final String ID = "10";
    public static final int ID_INT = Integer.parseInt(ID, 16 /* radix */);

    // EAP-AKA Identity request
    public static final String EAP_REQUEST_TYPE_DATA = "0500000D010000";
    public static final byte[] EAP_AKA_IDENTITY_REQUEST =
            hexStringToByteArray(EAP_REQUEST_TYPE_DATA);

    // EAP-AKA/Identity request with no attributes
    public static final byte[] EAP_REQUEST_AKA = hexStringToByteArray("01" + ID + "000817050000");
    public static final byte[] EAP_REQUEST_AKA_IDENTITY_PACKET =
            hexStringToByteArray("01" + ID + "000A17" + EAP_REQUEST_TYPE_DATA);
    public static final byte[] EAP_REQUEST_IDENTITY_PACKET =
            hexStringToByteArray("01" + ID + "000501");
    public static final byte[] EAP_REQUEST_IDENTITY_PACKET_TOO_LONG =
            hexStringToByteArray("01" + ID + "00050100");

    // EAP-Identity: hex for ASCII in "test@android.net"
    public static final String EAP_IDENTITY_STRING = "7465737440616E64726F69642E6E6574";
    public static final byte[] EAP_IDENTITY = hexStringToByteArray(EAP_IDENTITY_STRING);
    public static final byte[] EAP_RESPONSE_IDENTITY_PACKET =
            hexStringToByteArray("02" + ID + "001501" + EAP_IDENTITY_STRING);
    public static final byte[] EAP_RESPONSE_IDENTITY_DEFAULT_PACKET =
            hexStringToByteArray("02" + ID + "000501");
    public static final byte[] EAP_REQUEST_NOTIFICATION_PACKET =
            hexStringToByteArray("01" + ID + "000802AABBCC");
    public static final byte[] EAP_SUCCESS_PACKET = hexStringToByteArray("03" + ID + "0004");
    public static final byte[] EAP_FAILURE_PACKET = hexStringToByteArray("04" + ID + "0004");
    public static final byte[] EAP_SIM_CLIENT_ERROR_RESPONSE =
            hexStringToByteArray("02" + ID + "000C120E000016010001");
    public static final byte[] EAP_SIM_CLIENT_ERROR_INSUFFICIENT_CHALLENGES =
            hexStringToByteArray("02" + ID + "000C120E000016010002");
    public static final byte[] EAP_SIM_CLIENT_ERROR_UNABLE_TO_PROCESS =
            hexStringToByteArray("02" + ID + "000C120E000016010000");
    public static final byte[] EAP_AKA_CLIENT_ERROR_UNABLE_TO_PROCESS =
            hexStringToByteArray("02" + ID + "000C170E000016010000");

    // EAP-SIM response containing SELECTED_VERSION (1) and IDENTITY attributes
    public static final byte[] EAP_SIM_RESPONSE_PACKET = hexStringToByteArray(
            "02" + ID + "0024120A0000100100010E060011" + IDENTITY_STRING + "000000");
    public static final byte[] EAP_SIM_RESPONSE_WITHOUT_IDENTITY =
            hexStringToByteArray("02" + ID + "0020120A000007050000" + NONCE_MT_STRING + "10010001");
    public static final byte[] EAP_SIM_NOTIFICATION_RESPONSE = hexStringToByteArray(
            "02" + ID + "0008120C0000");
    public static final byte[] EAP_AKA_NOTIFICATION_RESPONSE =
            hexStringToByteArray("02" + ID + "0008170C0000");

    // Body of EapData is the list of supported methods
    public static final byte[] EAP_RESPONSE_NAK_PACKET =
            hexStringToByteArray("02" + ID + "00060312");
    public static final byte[] EAP_RESPONSE_NOTIFICATION_PACKET =
            hexStringToByteArray("02" + ID + "000502");
    public static final byte[] EAP_REQUEST_MD5_CHALLENGE =
            hexStringToByteArray("01" + ID + "000504");
    public static final byte[] EAP_REQUEST_NAK_PACKET =
            hexStringToByteArray("01" + ID + "000503");
    public static final String EAP_REQUEST_SIM_TYPE_DATA = "0A00000F02000200010000";
    public static final byte[] EAP_REQUEST_SIM_START_PACKET =
            hexStringToByteArray("01" + ID + "001012" + EAP_REQUEST_SIM_TYPE_DATA);

    public static final byte[] REQUEST_UNSUPPORTED_TYPE_PACKET =
            hexStringToByteArray("01" + ID + "0005FF");
    public static final byte[] REQUEST_MISSING_TYPE_PACKET =
            hexStringToByteArray("01" + ID + "0004");
    public static final byte[] LONG_SUCCESS_PACKET = hexStringToByteArray("03" + ID + "000500");
    public static final byte[] SHORT_PACKET = hexStringToByteArray("01" + ID + "0005");
    public static final byte[] INCOMPLETE_HEADER_PACKET = hexStringToByteArray("03" + ID);
    public static final byte[] INVALID_CODE_PACKET = hexStringToByteArray("F0" + ID + "0004");

    // Attributes
    public static final String SKIPPABLE_DATA = "112233445566";
    public static final byte[] SKIPPABLE_DATA_BYTES = hexStringToByteArray(SKIPPABLE_DATA);
    public static final byte[] SKIPPABLE_INVALID_ATTRIBUTE =
            hexStringToByteArray("FF02" + SKIPPABLE_DATA);
    public static final byte[] NON_SKIPPABLE_INVALID_ATTRIBUTE =
            hexStringToByteArray("7F010000");

    // Type-Data
    public static final byte[] EAP_SIM_START_SUBTYPE =
            hexStringToByteArray("0A00000F02" + AT_VERSION_LIST_DATA + "0A010000");
    public static final byte[] INVALID_SUBTYPE = hexStringToByteArray("FF");
    public static final byte[] TYPE_DATA_INVALID_AT_RAND =
            hexStringToByteArray("0A000001050000" + RAND_1);
    public static final byte[] SHORT_TYPE_DATA = hexStringToByteArray("0A");
    public static final byte[] TYPE_DATA_INVALID_ATTRIBUTE =
            hexStringToByteArray("0A00007F01");
    public static final byte[] EAP_SIM_START_DUPLICATE_ATTRIBUTES =
            hexStringToByteArray("0A00000F02" + "0A010000" + "0A010000");

    // RAND Challenge Results
    public static final String SRES_1 = "11223344";
    public static final byte[] SRES_1_BYTES = hexStringToByteArray(SRES_1);
    public static final String SRES_2 = "44332211";
    public static final byte[] SRES_2_BYTES = hexStringToByteArray(SRES_2);
    public static final byte[] SRES_BYTES = hexStringToByteArray(SRES_1 + SRES_2);
    public static final String KC_1 = "0102030405060708";
    public static final byte[] KC_1_BYTES = hexStringToByteArray(KC_1);
    public static final String KC_2 = "0807060504030201";
    public static final byte[] KC_2_BYTES = hexStringToByteArray(KC_2);
    public static final byte[] VALID_CHALLENGE_RESPONSE =
            hexStringToByteArray("04" + SRES_1 + "08" + KC_1);
    public static final byte[] CHALLENGE_RESPONSE_INVALID_SRES = hexStringToByteArray("03");
    public static final byte[] CHALLENGE_RESPONSE_INVALID_KC =
            hexStringToByteArray("04" + SRES_1 + "04");

    public static final String IMSI = "123456789012345";
    public static final String EAP_SIM_IDENTITY = "1" + IMSI;
    public static final byte[] EAP_SIM_IDENTITY_BYTES = hexStringToByteArray(EAP_SIM_IDENTITY);

    // ASCII hex for "0" + IMSI (EAP-AKA identity format)
    public static final String EAP_AKA_IDENTITY_BYTES = "30313233343536373839303132333435";

    // Master Key generation
    public static final String MK_STRING = "0123456789ABCDEF0123456789ABCDEF01234567";
    public static final byte[] MK = hexStringToByteArray(MK_STRING);
    public static final String K_ENCR_STRING = "000102030405060708090A0B0C0D0E0F";
    public static final byte[] K_ENCR = hexStringToByteArray(K_ENCR_STRING);
    public static final String K_AUT_STRING = "0F0E0D0C0B0A09080706050403020100";
    public static final byte[] K_AUT = hexStringToByteArray(K_AUT_STRING);
    public static final String MSK_STRING =
            "00112233445566778899AABBCCDDEEFF"
            + "00112233445566778899AABBCCDDEEFF"
            + "00112233445566778899AABBCCDDEEFF"
            + "00112233445566778899AABBCCDDEEFF";
    public static final byte[] MSK = hexStringToByteArray(MSK_STRING);
    public static final String EMSK_STRING =
            "FFEEDDCCBBAA99887766554433221100"
            + "FFEEDDCCBBAA99887766554433221100"
            + "FFEEDDCCBBAA99887766554433221100"
            + "FFEEDDCCBBAA99887766554433221100";
    public static final byte[] EMSK = hexStringToByteArray(EMSK_STRING);

    // MAC computation
    public static final String ORIGINAL_MAC_STRING = "112233445566778899AABBCCDDEEFF11";
    public static final byte[] ORIGINAL_MAC = hexStringToByteArray(ORIGINAL_MAC_STRING);
    public static final String COMPUTED_MAC_STRING = "FFEEDDCCBBAA998877665544332211FF";
    public static final byte[] COMPUTED_MAC = hexStringToByteArray(COMPUTED_MAC_STRING);
    public static final String EAP_SIM_CHALLENGE_REQUEST_STRING =
            "01" + ID + "0040" // EAP-Request | ID | length in bytes
            + "120b0000" // EAP-SIM | Challenge | 2B padding
            + "01090000" + RAND_1 + RAND_2 // EAP-SIM AT_RAND attribute
            + "0B05000000000000000000000000000000000000"; // AT_MAC attribute with no MAC
    public static final byte[] MAC_INPUT =
            hexStringToByteArray(EAP_SIM_CHALLENGE_REQUEST_STRING + NONCE_MT_STRING);

    // Response Message with MAC
    public static final String EAP_SIM_CHALLENGE_RESPONSE_EMPTY_MAC =
            "02" + ID + "001C" // EAP-Response | ID | length in bytes
            + "120b0000" // EAP-SIM | Challenge | 2B padding
            + "0B05000000000000000000000000000000000000"; // AT_MAC attribute with no MAC
    public static final byte[] EAP_SIM_CHALLENGE_RESPONSE_MAC_INPUT =
            hexStringToByteArray(EAP_SIM_CHALLENGE_RESPONSE_EMPTY_MAC + SRES_1 + SRES_2);
    public static final byte[] EAP_SIM_CHALLENGE_RESPONSE_WITH_MAC = hexStringToByteArray(
            "02" + ID + "001C" // EAP-Response | ID | length in bytes
            + "120b0000" // EAP-SIM | Challenge | 2B padding
            + "0B050000" + COMPUTED_MAC_STRING); // AT_MAC attribute
    public static final byte[] EAP_SIM_NOTIFICATION_REQUEST_WITH_EMPTY_MAC = hexStringToByteArray(
            "01" + ID + "0020" // EAP-Request | ID | length in bytes
                    + "120C0000" // EAP-SIM | Notification | 2B padding
                    + "0C010000" // AT_NOTIFICATION attribute
                    + "0B05000000000000000000000000000000000000"); // empty AT_MAC attribute
    public static final byte[] EAP_SIM_NOTIFICATION_RESPONSE_WITH_EMPTY_MAC = hexStringToByteArray(
            "02" + ID + "001C" // EAP-Response | ID | length in bytes
                    + "120C0000" // EAP-SIM | Notification | 2B padding
                    + "0B05000000000000000000000000000000000000"); // empty AT_MAC attribute
    public static final byte[] EAP_SIM_NOTIFICATION_RESPONSE_WITH_MAC = hexStringToByteArray(
            "02" + ID + "001C" // EAP-Response | ID | length in bytes
            + "120C0000" // EAP-SIM | Notification | 2B padding
            + "0B050000" + COMPUTED_MAC_STRING); // AT_MAC attribute

    public static final byte[] EAP_AKA_IDENTITY_RESPONSE =
            hexStringToByteArray("02" + ID + "001C" // EAP-Response | ID | length in bytes
                    + "17050000" // EAP-AKA | Identity | 2B padding
                    + "0E050010" + EAP_AKA_IDENTITY_BYTES); // AT_IDENTITY ("0" + IMSI)

    // Base64 of: FF0111
    public static final String EAP_AKA_UICC_RESP_INVALID_TAG = "/wER";

    // Base64 of: DC0E112233445566778899AABBCCDDEE
    public static final String EAP_AKA_UICC_RESP_SYNCHRONIZE_BASE_64 = "3A4RIjNEVWZ3iJmqu8zd7g==";

    public static final byte[] EAP_AKA_SYNCHRONIZATION_FAILURE =
            hexStringToByteArray("02" + ID + "0018" // EAP-Response | ID | length in bytes
                    + "17040000" // EAP-SIM | Synchronization-Failure | 2B padding
                    + "0404112233445566778899AABBCCDDEE"); // AT_AUTS attribute

    public static final String CK = "00112233445566778899AABBCCDDEEFF";
    public static final byte[] CK_BYTES = hexStringToByteArray(CK);
    public static final String IK = "FFEEDDCCBBAA99887766554433221100";
    public static final byte[] IK_BYTES = hexStringToByteArray(IK);

    // Base-64 of: 'DB05' + RES_BYTES + '10' + CK + '10' + IK
    // 'DB0511223344551000112233445566778899AABBCCDDEEFF10FFEEDDCCBBAA99887766554433221100'
    public static final String EAP_AKA_UICC_RESP_SUCCESS_BASE_64 =
            "2wURIjNEVRAAESIzRFVmd4iZqrvM3e7/EP/u3cy7qpmId2ZVRDMiEQA=";

    public static final byte[] EAP_AKA_AUTHENTICATION_REJECT =
            hexStringToByteArray("02" + ID + "000817020000");
    public static final String EAP_AKA_CHALLENGE_RESPONSE_MAC = "7086E8341306F99CDB949DBE9CAC4EB2";
    public static final byte[] EAP_AKA_CHALLENGE_RESPONSE_MAC_BYTES =
            hexStringToByteArray(EAP_AKA_CHALLENGE_RESPONSE_MAC);
    public static final byte[] EAP_AKA_CHALLENGE_RESPONSE_TYPE_DATA =
            hexStringToByteArray(
                    "01000003030028" + RES + "0000000B050000" + EAP_AKA_CHALLENGE_RESPONSE_MAC);
    public static final byte[] EAP_AKA_CHALLENGE_RESPONSE =
            hexStringToByteArray(
                    "02100028" // EAP-Response | ID | length in bytes
                            + "17010000" // EAP-AKA | Challenge | 2B padding
                            + "03030028" + RES + "000000" // AT_RES attribute
                            + "0B050000" + EAP_AKA_CHALLENGE_RESPONSE_MAC); // AT_MAC attribute

    public static final byte[] EAP_SUCCESS = hexStringToByteArray("03860004");

    public static final byte[] EAP_REQUEST_MSCHAP_V2 =
            hexStringToByteArray("01" + ID + "00061A01");

    // MSCHAPv2 Test vectors taken from RFC 2759#9.2 and RFC 3079#3.5.3
    public static final String MSCHAP_V2_USERNAME = "User";
    public static final String MSCHAP_V2_USERNAME_HEX = "55736572";
    public static final byte[] MSCHAP_V2_USERNAME_ASCII_BYTES =
            hexStringToByteArray(MSCHAP_V2_USERNAME_HEX);
    public static final String MSCHAP_V2_PASSWORD = "clientPass";
    public static final byte[] MSCHAP_V2_PASSWORD_UTF_BYTES =
            hexStringToByteArray("63006C00690065006E0074005000610073007300");
    public static final String MSCHAP_V2_AUTHENTICATOR_CHALLENGE_STRING =
            "5B5D7C7D7B3F2F3E3C2C602132262628";
    public static final byte[] MSCHAP_V2_AUTHENTICATOR_CHALLENGE =
            hexStringToByteArray(MSCHAP_V2_AUTHENTICATOR_CHALLENGE_STRING);
    public static final String MSCHAP_V2_PEER_CHALLENGE_STRING = "21402324255E262A28295F2B3A337C7E";
    public static final byte[] MSCHAP_V2_PEER_CHALLENGE =
            hexStringToByteArray(MSCHAP_V2_PEER_CHALLENGE_STRING);
    public static final byte[] MSCHAP_V2_CHALLENGE = hexStringToByteArray("D02E4386BCE91226");
    public static final byte[] MSCHAP_V2_PASSWORD_HASH =
            hexStringToByteArray("44EBBA8D5312B8D611474411F56989AE");
    public static final byte[] MSCHAP_V2_PASSWORD_HASH_HASH =
            hexStringToByteArray("41C00C584BD2D91C4017A2A12FA59F3F");
    public static final String MSCHAP_V2_NT_RESPONSE_STRING =
            "82309ECD8D708B5EA08FAA3981CD83544233114A3D85D6DF";
    public static final byte[] MSCHAP_V2_NT_RESPONSE =
            hexStringToByteArray(MSCHAP_V2_NT_RESPONSE_STRING);
    public static final byte[] MSCHAP_V2_AUTHENTICATOR_RESPONSE =
            hexStringToByteArray("407A5589115FD0D6209F510FE9C04566932CDA56");
    public static final byte[] MSCHAP_V2_MASTER_KEY =
            hexStringToByteArray("FDECE3717A8C838CB388E527AE3CDD31");

    // generated based on RFC 3079#3.5.3 params
    public static final String SEND_KEY = "D5F0E9521E3EA9589645E86051C82226";
    public static final byte[] MSCHAP_V2_SEND_START_KEY = hexStringToByteArray(SEND_KEY);

    // This value is labeled 'send key' in RFC 3079#3.5.3. However, it's used as 'receive key' here,
    // because send and receive keys are swapped for peers relative to authenticators.
    public static final String RECEIVE_KEY = "8B7CDC149B993A1BA118CB153F56DCCB";
    public static final byte[] MSCHAP_V2_RECEIVE_START_KEY = hexStringToByteArray(RECEIVE_KEY);

    // MSK: MSCHAP_V2_SEND_START_KEY + MSCHAP_V2_RECEIVE_START_KEY, padded to 64B
    public static final byte[] MSCHAP_V2_MSK =
            hexStringToByteArray(
                    SEND_KEY
                            + RECEIVE_KEY
                            + "0000000000000000000000000000000000000000000000000000000000000000");
    public static final int MSCHAP_V2_EMSK_LEN = 64;
    public static final byte[] MSCHAP_V2_EMSK = new byte[MSCHAP_V2_EMSK_LEN];

    public static final String MSCHAP_V2_ID = "42";
    public static final int MSCHAP_V2_ID_INT = Integer.parseInt(MSCHAP_V2_ID, 16 /* radix */);
    public static final byte[] EAP_MSCHAP_V2_CHALLENGE_RESPONSE =
            hexStringToByteArray("02" + ID + "003F" // EAP-Response | ID | length in bytes
                    + "1A02" + MSCHAP_V2_ID // EAP-MSCHAPv2 | Response | MSCHAPv2 ID
                    + "003A31" // MS length | Value Size (0x31)
                    + MSCHAP_V2_PEER_CHALLENGE_STRING
                    + "0000000000000000" // 8B (reserved)
                    + MSCHAP_V2_NT_RESPONSE_STRING
                    + "00" // Flags (always 0)
                    + MSCHAP_V2_USERNAME_HEX);

    public static final byte[] EAP_MSCHAP_V2_SUCCESS_RESPONSE =
            hexStringToByteArray("02" + ID + "0006" // EAP-Response | ID | length in bytes
                    + "1A03"); // EAP-MSCHAPv2 | Success

    public static final byte[] INVALID_AUTHENTICATOR_RESPONSE = new byte[20];

    public static final byte[] EAP_MSCHAP_V2_FAILURE_RESPONSE =
            hexStringToByteArray("02" + ID + "0006" // EAP-Response | ID | length in bytes
                    + "1A04"); // EAP-MSCHAPv2 | Failure

    public static final byte[] EAP_AKA_PRIME_REQUEST =
            hexStringToByteArray("01" + ID + "000832050000");
    public static final byte[] EAP_AKA_PRIME_CLIENT_ERROR_UNABLE_TO_PROCESS =
            hexStringToByteArray("02" + ID + "000C320E000016010000");
    public static final String EAP_AKA_PRIME_IDENTITY = "36313233343536373839303132333435";
    public static final byte[] EAP_AKA_PRIME_IDENTITY_BYTES =
            hexStringToByteArray(EAP_AKA_PRIME_IDENTITY);
    public static final byte[] EAP_AKA_PRIME_IDENTITY_RESPONSE =
            hexStringToByteArray(
                    "02" + ID + "001C" // EAP-Response | ID | length in bytes
                            + "32050000" // EAP-AKA' | Identity | 2B padding
                            + "0E050010" + EAP_AKA_PRIME_IDENTITY); // AT_IDENTITY ("6" + IMSI)
    public static final byte[] EAP_AKA_PRIME_AUTHENTICATION_REJECT =
            hexStringToByteArray(
                    "02" + ID + "0008" // EAP-Response | ID | length in bytes
                            + "32020000"); // EAP-AKA' | Authentication Reject | 2B padding

    // EAP-TTLS test vectors
    public static final String EAP_DUMMY_REQUEST = "011000051A";
    public static final String EAP_DUMMY_RESPONSE = "021000051A";
    public static final String EAP_TTLS_DUMMY_DATA =
            "17010160301000E050010a516030100a010000a151603010036313233343"
                    + "5363738393031323334003A31316030100a55a51603320500000100a516030100a50";
    public static final String EAP_TTLS_DUMMY_DATA_INITIAL_FRAGMENT =
            "36313233343536373839303132333435030100a010000a151603010036313"
                    + "2333435363738393031323334003A31316030100a55a51603320500000100a51603";
    public static final String EAP_TTLS_DUMMY_DATA_FINAL_FRAGMENT =
            "010000a10E050010320200000000000000000000";
    public static final String EAP_TTLS_DUMMY_DATA_ASSEMBLED_FRAGMENT =
            EAP_TTLS_DUMMY_DATA_INITIAL_FRAGMENT + EAP_TTLS_DUMMY_DATA_FINAL_FRAGMENT;

    public static final byte[] EAP_DUMMY_REQUEST_BYTES = hexStringToByteArray(EAP_DUMMY_REQUEST);
    public static final byte[] EAP_DUMMY_RESPONSE_BYTES = hexStringToByteArray(EAP_DUMMY_RESPONSE);
    public static final byte[] EAP_TTLS_DUMMY_DATA_BYTES =
            hexStringToByteArray(EAP_TTLS_DUMMY_DATA);
    public static final byte[] EAP_TTLS_DUMMY_DATA_ASSEMBLED_FRAGMENT_BYTES =
            hexStringToByteArray(EAP_TTLS_DUMMY_DATA_ASSEMBLED_FRAGMENT);
    public static final byte[] EAP_TTLS_DUMMY_DATA_INITIAL_FRAGMENT_BYTES =
            hexStringToByteArray(EAP_TTLS_DUMMY_DATA_INITIAL_FRAGMENT);
    public static final byte[] EAP_TTLS_DUMMY_DATA_FINAL_FRAGMENT_BYTES =
            hexStringToByteArray(EAP_TTLS_DUMMY_DATA_FINAL_FRAGMENT);

    public static final byte[] EAP_REQUEST_TTLS_START =
            hexStringToByteArray(
                    "01" + ID + "0006" // EAP-REQUEST | ID | length in bytes
                            + "1520"); // EAP-TTLS | flags
    public static final byte[] EAP_RESPONSE_TTLS_WITH_LENGTH =
            hexStringToByteArray(
                    "02" + ID + "004A" // EAP-RESPONSE | ID | length in bytes
                            + "158000000040" // EAP-TTLS | flags | message length in bytes
                            + EAP_TTLS_DUMMY_DATA);
    public static final byte[] EAP_RESPONSE_TTLS_WITHOUT_LENGTH =
            hexStringToByteArray(
                    "02" + ID + "0046" // EAP-RESPONSE | ID | length in bytes
                            + "1500" // EAP-TTLS | flags
                            + EAP_TTLS_DUMMY_DATA);
    public static final byte[] EAP_RESPONSE_TTLS_INITIAL_FRAGMENT =
            hexStringToByteArray(
                    "02" + ID + "004A" // EAP-RESPONSE | ID | length in bytes
                            + "15C000000054" // EAP-TTLS | flags | message length in bytes
                            + EAP_TTLS_DUMMY_DATA_INITIAL_FRAGMENT);
    public static final byte[] EAP_RESPONSE_TTLS_FINAL_FRAGMENT =
            hexStringToByteArray(
                    "02" + ID + "001A" // EAP-RESPONSE | ID | length in bytes
                            + "1500" // EAP-TTLS | flags
                            + EAP_TTLS_DUMMY_DATA_FINAL_FRAGMENT);
    public static final byte[] EAP_RESPONSE_TTLS_ACK =
            hexStringToByteArray(
                    "02" + ID + "0006" // EAP-RESPONSE | ID | length in bytes
                            + "1500"); // EAP-TTLS | flags
    public static final byte[] EAP_MESSAGE_AVP_EAP_REQUEST =
            hexStringToByteArray(
                    "0000004F"
                            + "40"
                            + "00000D" // AVP Code | AVP Flags | Avp Length
                            + EAP_DUMMY_REQUEST // EAP-REQUEST
                            + "000000"); // Padding
    public static final byte[] EAP_MESSAGE_AVP_EAP_RESPONSE =
            hexStringToByteArray(
                    "0000004F"
                            + "40"
                            + "00000D" // AVP Code | AVP Flags | Avp Length
                            + EAP_DUMMY_RESPONSE // EAP-RESPONSE
                            + "000000"); // Padding
}