text: /*
   * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The OpenAirInterface Software Alliance licenses this file to You under
   * the OAI Public License, Version 1.1  (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.openairinterface.org/?page_id=698
   *
   * 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.
   *-------------------------------------------------------------------------------
   * For more information about the OpenAirInterface (OAI) Software Alliance:
   *      contact@openairinterface.org
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdint.h>
  #include "TLVEncoder.h"
  #include "TLVDecoder.h"
  #include "AuthenticationRequest.h"
  #include "3gpp_24.501.h"
  
  int decode_authentication_request(
      authentication_request_msg* authentication_request, uint8_t* buffer,
      uint32_t len) {
    uint32_t decoded   = 0;
    int decoded_result = 0;
  
    // Check if we got a NULL pointer and if buffer length is >= minimum length
    // expected for the message.
    CHECK_PDU_POINTER_AND_LENGTH_DECODER(
        buffer, AUTHENTICATION_REQUEST_MINIMUM_LENGTH, len);
  
    /*
     * Decoding mandatory fields
     */
    if ((decoded_result = decode_u8_nas_key_set_identifier(
             &authentication_request->naskeysetidentifier, 0,
             *(buffer + decoded) >> 4, len - decoded)) < 0)
      return decoded_result;
  
    decoded++;
  
    if ((decoded_result = decode_abba(
             &authentication_request->abba, 0, buffer + decoded, len - decoded)) <
        0)
      return decoded_result;
    else
      decoded += decoded_result;
  
    while (len - decoded > 0) {
      uint8_t ieiDecoded = *(buffer + decoded);
      if (ieiDecoded == 0) break;
      switch (ieiDecoded) {
        case AUTHENTICATION_PARAMETER_RAND_IEI:
          if ((decoded_result = decode_authentication_parameter_rand(
                   &authentication_request->authenticationparameterrand,
                   AUTHENTICATION_PARAMETER_RAND_IEI, buffer + decoded,
                   len - decoded)) < 0)
            return decoded_result;
          else {
            decoded += decoded_result;
            authentication_request->presence |=
                AUTHENTICATION_REQUEST_AUTHENTICATION_PARAMETER_RAND_PRESENT;
          }
          break;
        case AUTHENTICATION_PARAMETER_AUTN_IEI:
          if ((decoded_result = decode_authentication_parameter_autn(
                   &authentication_request->authenticationparameterautn,
                   AUTHENTICATION_PARAMETER_AUTN_IEI, buffer + decoded,
                   len - decoded)) < 0)
            return decoded_result;
          else {
            decoded += decoded_result;
            authentication_request->presence |=
                AUTHENTICATION_REQUEST_AUTHENTICATION_PARAMETER_AUTN_PRESENT;
          }
          break;
        case EAP_MESSAGE_IEI:
          if ((decoded_result = decode_eap_message(
                   &authentication_request->eapmessage, EAP_MESSAGE_IEI,
                   buffer + decoded, len - decoded)) < 0)
            return decoded_result;
          else {
            decoded += decoded_result;
  
            authentication_request->presence |=
                AUTHENTICATION_REQUEST_EAP_MESSAGE_PRESENT;
          }
          break;
      }
    }
  
    return decoded;
  }
  
  int encode_authentication_request(
      authentication_request_msg* authentication_request, uint8_t* buffer,
      uint32_t len) {
    uint32_t encoded   = 0;
    int encoded_result = 0;
  
    // Check if we got a NULL pointer and if buffer length is >= minimum length
    // expected for the message.
    CHECK_PDU_POINTER_AND_LENGTH_ENCODER(
        buffer, AUTHENTICATION_REQUEST_MINIMUM_LENGTH, len);
  
    *(buffer + encoded) = ((encode_u8_nas_key_set_identifier(
                                &authentication_request->naskeysetidentifier) &
                            0x0f)
                           << 4) |
                          0x00;
    encoded++;
  
    if ((encoded_result = encode_abba(
             authentication_request->abba, 0, buffer + encoded, len - encoded)) <
        0)
      return encoded_result;
    else
      encoded += encoded_result;
  
    if ((authentication_request->presence &
         AUTHENTICATION_REQUEST_AUTHENTICATION_PARAMETER_RAND_PRESENT) ==
        AUTHENTICATION_REQUEST_AUTHENTICATION_PARAMETER_RAND_PRESENT) {
      if ((encoded_result = encode_authentication_parameter_rand(
               authentication_request->authenticationparameterrand,
               AUTHENTICATION_PARAMETER_RAND_IEI, buffer + encoded,
               len - encoded)) < 0)
        return encoded_result;
      else
        encoded += encoded_result;
    }
    if ((authentication_request->presence &
         AUTHENTICATION_REQUEST_AUTHENTICATION_PARAMETER_AUTN_PRESENT) ==
        AUTHENTICATION_REQUEST_AUTHENTICATION_PARAMETER_AUTN_PRESENT) {
      if ((encoded_result = encode_authentication_parameter_autn(
               authentication_request->authenticationparameterautn,
               AUTHENTICATION_PARAMETER_AUTN_IEI, buffer + encoded,
               len - encoded)) < 0)
        return encoded_result;
      else
        encoded += encoded_result;
    }
    if ((authentication_request->presence &
         AUTHENTICATION_REQUEST_EAP_MESSAGE_PRESENT) ==
        AUTHENTICATION_REQUEST_EAP_MESSAGE_PRESENT) {
      if ((encoded_result = encode_eap_message(
               authentication_request->eapmessage, EAP_MESSAGE_IEI,
               buffer + encoded, len - encoded)) < 0)
        return encoded_result;
      else
        encoded += encoded_result;
    }
    return encoded;
  }
  