LibItsPki_Functions.ttcn

/**
 *  @author   ETSI / STF544
 *  @version  $URL$
 *            $Id$
 *  @desc     Module containing functions for ITS PKI ATS
 *  @copyright   ETSI Copyright Notification
 *               No part may be reproduced except as authorized by written permission.
 *               The copyright and the foregoing restriction extend to reproduction in all media.
 *               All rights reserved.
 *
 */
module LibItsPki_Functions {
    
  // LibCommon
  import from LibCommon_Time all;
  import from LibCommon_VerdictControl all;
  import from LibCommon_Sync all;
  import from LibCommon_BasicTypesAndValues all;
  import from LibCommon_DataStrings all;
  
  // LibIts
  import from IEEE1609dot2BaseTypes language "ASN.1:1997" all;
  import from IEEE1609dot2 language "ASN.1:1997" all;
  import from EtsiTs102941BaseTypes language "ASN.1:1997" all;
  import from EtsiTs102941TypesEnrolment language "ASN.1:1997" all;
  import from EtsiTs102941TypesAuthorization language "ASN.1:1997" all;
  import from EtsiTs102941TypesAuthorizationValidation language "ASN.1:1997" all;
  import from EtsiTs102941MessagesCa language "ASN.1:1997" all;
  import from EtsiTs103097Module language "ASN.1:1997" all;
  import from ITS_Container language "ASN.1:1997" all;
  import from CAM_PDU_Descriptions language "ASN.1:1997" all;
  
  // LibItsCommon
  import from LibItsCommon_TypesAndValues all;
  import from LibItsCommon_Functions all;
  import from LibItsCommon_ASN1_NamedNumbers all;
  import from LibItsCommon_Pixits all;
  
  // LibItsGeoNetworking
  import from LibItsGeoNetworking_Pixits all;
  
  // LibItsSecurity
  import from LibItsSecurity_TypesAndValues all;
  import from LibItsSecurity_Templates all;
  import from LibItsSecurity_Functions all;
  import from LibItsSecurity_Pics all;
  import from LibItsSecurity_Pixits all;
  import from LibItsSecurity_TestSystem all;
  
  // LibItsHttp
  import from LibItsHttp_TypesAndValues all;
  import from LibItsHttp_Templates all;
  import from LibItsHttp_BinaryTemplates all;
  import from LibItsHttp_Functions all;
  import from LibItsHttp_TestSystem all;
  
  // LibItsPki
  import from LibItsPki_TypesAndValues all;
  import from LibItsPki_Templates all;
  import from LibItsPki_Pics all;
  import from LibItsPki_Pixits all;
  import from LibItsPki_TestSystem all;
  
  group pkiConfigurationFunctions {
     
     /**
     * @desc    Setups default configuration
     * @param   p_certificate_id The certificate identifier the TA shall use in case of secured IUT
     */
    function f_cfHttpUp(
                        in charstring p_ea_certificate_id := "CERT_TS_A_EA", // TODO Use a constant
                        in charstring p_aa_certificate_id := "CERT_TS_A_AA"
                        ) runs on ItsPkiHttp /* TITAN TODO: system ItsPkiHttpSystem */ {

      if (LibItsPki_Pics.PICS_MULTIPLE_END_POINT == false) {
        map(self:httpPort, system:httpPort);
      } else {
        map(self:httpEcPort, system:httpEcPort);
        map(self:httpAtVPort, system:httpAtVPort);
        map(self:httpAtPort, system:httpAtPort);
      }
      f_connect4SelfOrClientSync();

      f_initialiseSecuredMode(p_ea_certificate_id, p_aa_certificate_id); // TODO To be removed???

      // Setup EA certificate shared with PKI EA entity
      f_readCertificate(p_ea_certificate_id, vc_eaCertificate);
      //      f_readSigningKey(p_ea_certificate_id, vc_eaPrivateKey); // TODO To be removed
      //      f_readCertificate(p_aa_certificate_id, vc_ecCertificate); // TODO To be removed
      //      f_readSigningKey(p_aa_certificate_id, vc_ecPrivateKey); // TODO To be removed
      //      f_readEncryptingKey(p_ea_certificate_id, vc_eaPrivateEncKey); // TODO To be removed
      f_getCertificateDigest(p_ea_certificate_id, vc_eaHashedId8);
      f_getCertificateHash(p_ea_certificate_id, vc_eaWholeHash);
      
      // Setup AA certificate shared with PKI AA entity
      f_readCertificate(p_aa_certificate_id, vc_aaCertificate);
      f_getCertificateDigest(p_aa_certificate_id, vc_aaHashedId8);
      f_getCertificateHash(p_aa_certificate_id, vc_aaWholeHash);
      log("vc_aaHashedId8= ", vc_aaHashedId8);
      log("vc_aaWholeHash= ", vc_aaWholeHash);
      //      f_readCertificate(p_peerCertificateId, vc_peerEaCertificate); // TODO To be removed
      //      f_getCertificateHash(p_peerCertificateId, vc_eaPeerWholeHash); // TODO To be removed

      if (PICS_MULTIPLE_END_POINT == false) {
        activate(a_default_pki_http());
      } else {
        activate(a_default_pki_http_ec());
        activate(a_default_pki_http_atv());
        activate(a_default_pki_http_at());
      }
    } // End of function f_cfHttpUp
    
    function f_cfUp_itss(
                         in charstring p_certificate_id := "CERT_TS_A_EA" // TODO Use a constant
                         ) runs on ItsPkiItss /* TITAN TODO: system ItsPkiItssSystem */ {
      
      map(self:geoNetworkingPort, system:geoNetworkingPort);
      map(self:utPort, system:utPort);
      //map(self:acPort, system:acPort);
      
      f_initializeState();
      
      // activate(a_default_pki()); TOTO Defualt from geoNet
    } // End of function f_cfUp_itss

    /**
     * @desc    Deletes default configuration 
     */
    function f_cfHttpDown() runs on ItsPkiHttp /* TITAN TODO: system ItsPkiHttpSystem */ {
      if (PICS_MULTIPLE_END_POINT == false) {
        unmap(self:httpPort, system:httpPort);
      } else {
        unmap(self:httpEcPort, system:httpEcPort);
        unmap(self:httpAtVPort, system:httpAtVPort);
        unmap(self:httpAtPort, system:httpAtPort);
      }
      f_disconnect4SelfOrClientSync();
      f_uninitialiseSecuredMode();
    } // End of function f_cfHttpDown
    
    /**
     * @desc    Deletes default configuration 
     */
    function f_cfDown_itss() runs on ItsPkiItss /* TITAN TODO: system ItsPkiItssSystem */ {
      unmap(self:geoNetworkingPort, system:geoNetworkingPort);
      unmap(self:utPort, system:utPort);
      //unmap(self:acPort, system:acPort);
      
    } // End of function f_cfDown
    
    /**
     * @desc Initialise secure mode if required
     */
    function f_initialiseSecuredMode(
                                     in charstring p_certificate_id  := "CERT_TS_A_EA", // TODO Use a constant
                                     in charstring p_peerCertificateId := "CERT_IUT_A_EA"
                                     ) runs on ItsSecurityBaseComponent {
      // Local variables
      
      // Load certificates
      if(not(f_loadCertificates(PX_IUT_SEC_CONFIG_NAME))) {
        log("*** INFO: TEST CASE NOW STOPPING ITSELF! ***");
        setverdict(inconc);
        stop;
      }
      
      //      f_prepareCertificates(p_certificate_id, vc_aaCertificate, vc_atCertificate);
    } // End of function f_initialiseSecuredMode()
    
    function f_uninitialiseSecuredMode() runs on ItsSecurityBaseComponent {
      f_unloadCertificates();
    } // End of function f_uninitialiseSecuredMode()
    
    function f_initializeState() runs on ItsPkiItss {
      var Oct8 v_hashedId8ToBeUsed := f_setupIutCertificate(vc_hashedId8ToBeUsed);

      f_utInitializeIut(UtPkiInitialize: { v_hashedId8ToBeUsed } );

      f_sleep(PX_NEIGHBOUR_DISCOVERY_DELAY);
      
      //      f_acLoadScenario(p_scenario);
      //      f_acStartScenario();
    }
    
  } // End of pkiConfigurationFunctions

  group ut_port {

    function f_utInitializeIut(template (value) UtPkiInitialize p_init) runs on ItsPkiItss {
      timer tc_wait := PX_TAC;
      
      utPort.send(p_init);
      tc_wait.start;
      alt {
        [] utPort.receive(UtPkiResults: { utPkiInitializeResult := true }) {
          tc_wait.stop;
          log("*** f_utInitializeIut: INFO: IUT initialized ***");
        }
        [] utPort.receive {
          tc_wait.stop;
          log("*** f_utInitializeIut: INFO: IUT could not be initialized ***");
          f_selfOrClientSyncAndVerdict("error", e_error);
        }
        [] tc_wait.timeout {
          log("*** f_utInitializeIut: INFO: IUT could not be initialized in time ***");
          f_selfOrClientSyncAndVerdict("error", e_timeout);
        }
      }
      
    } // End of function f_utInitializeIut
    
    function f_sendUtTriggerPrimitive(
                                      in octetstring p_canonical_id,
                                      in Oct1 p_enc_algorithm,
                                      in octetstring p_private_key,
                                      in octetstring p_public_key_compressed,
                                      in integer p_compressed_mode
                                      ) runs on ItsPkiItss {
      var TriggerEnrolmentRequest v_ut_trigger_enrolment_request;
      var octetstring v_compressed_public_key;

      if (p_compressed_mode == 2) { // TODO v_compressed_public_key := int2oct(p_compressed_mode, 1) & p_public_key_compressed?
        v_compressed_public_key := '02'O & p_public_key_compressed;
      } else {
        v_compressed_public_key := '03'O & p_public_key_compressed;
      }
      
      v_ut_trigger_enrolment_request := { p_canonical_id, p_enc_algorithm, p_private_key, v_compressed_public_key };
      utPort.send(UtPkiTrigger: { triggerEnrolmentRequest := v_ut_trigger_enrolment_request });
      tc_ac.start;
      alt {
        [] utPort.receive(UtPkiResults: { utPkiTriggerResult := true }) {
          tc_ac.stop;
        }
        [] utPort.receive(UtPkiResults: { utPkiTriggerResult := false }) {
          tc_ac.stop;
          log("*** f_sendUtTriggerPrimitive: ERROR: Received unexpected message ***");
          f_selfOrClientSyncAndVerdict("error", e_error);
        }
        [] tc_ac.timeout {
          log("*** f_sendAcPkiPrimitive: ERROR: Timeout while waiting for adapter control event result ***");
          f_selfOrClientSyncAndVerdict("error", e_timeout);
        }
      } // End of 'alt' statement
    } // End of function f_sendUtTriggerPrimitive
    
  } // End of group ut_port

  group helpers {

    function f_generate_key_pair(
                                 out octetstring p_private_key,
                                 out octetstring p_public_key_x,
                                 out octetstring p_public_key_y,
                                 out octetstring p_public_key_compressed,
                                 out integer p_compressed_mode
                                 ) return boolean {
      if (PX_EC_ALG == e_nist_p256) {
        f_generate_key_pair_nistp256(p_private_key, p_public_key_x, p_public_key_y, p_public_key_compressed, p_compressed_mode);
      } else if (PX_EC_ALG == e_brainpool_p256_r1) {
        f_generate_key_pair_brainpoolp256(p_private_key, p_public_key_x, p_public_key_y, p_public_key_compressed, p_compressed_mode);
      } else {
        // error
        return false;
      }

      return true;
    }

    function f_signWithEcdsa(
                             in octetstring p_toBeSignedSecuredMessage,
                             in octetstring p_certificateIssuer,
                             in octetstring p_privateKey
                             ) return octetstring {
      if (PX_VE_ALG == e_nist_p256) {
        return f_signWithEcdsaNistp256WithSha256(p_toBeSignedSecuredMessage, p_certificateIssuer, p_privateKey);
      } else if (PX_VE_ALG == e_brainpool_p256_r1) {
        return f_signWithEcdsaBrainpoolp256WithSha256(p_toBeSignedSecuredMessage, p_certificateIssuer, p_privateKey);
      } else if (PX_VE_ALG == e_brainpool_p384_r1) {
        return f_signWithEcdsaBrainpoolp384WithSha384(p_toBeSignedSecuredMessage, p_certificateIssuer, p_privateKey);
      }
      
      return ''O;
    }
    
  } // End of group helpers
  
  group http { // TODO Split into EnnerEc, Authorization & AuthorizationValidation

    function f_http_build_inner_ec_request( // TODO Cleanup parameters
                                           out octetstring p_private_key,
                                           out octetstring p_public_key_compressed,
                                           out integer p_compressed_mode,
                                           out Oct16 p_aes_sym_key,
                                           out Oct16 p_encrypted_sym_key,
                                           out Oct16 p_authentication_vector,
                                           out Oct12 p_nonce,
                                           out octetstring p_salt,
                                           out Ieee1609Dot2Data p_ieee1609dot2_signed_and_encrypted_data,
                                           out Oct32 p_request_hash
                                           ) runs on ItsPkiHttp {
      var InnerEcRequest v_inner_ec_request;
      var Ieee1609Dot2Data v_inner_ec_request_signed_for_pop;
      var octetstring v_public_enc_key;
      var integer v_compressed_enc_key_mode;
      var boolean v_ret_code;

      log(">>> f_http_build_inner_ec_request");
      if (f_generate_inner_ec_request(p_private_key, p_public_key_compressed, p_compressed_mode, v_inner_ec_request) == false) {
        log("*** f_http_build_inner_ec_request: ERROR: Failed to generate InnerEcRequest ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log ("f_http_build_enrolment_request: EC verification private key: ", p_private_key);
      log ("f_http_build_enrolment_request: EC verification public compressed key: ", p_public_key_compressed);
      log ("f_http_build_enrolment_request: EC verification public compressed mode: ", p_compressed_mode);
      // Generate InnerEcRequestSignedForPoP
      if (f_generate_inner_ec_request_signed_for_pop(p_private_key, v_inner_ec_request, v_inner_ec_request_signed_for_pop) == false) {
        log("*** f_http_build_inner_ec_request: ERROR: Failed to generate InnerEcRequestSignedForPop ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log("v_inner_ec_request_signed_for_pop= ", v_inner_ec_request_signed_for_pop);
      
      // Secure InnerEcRequestSignedForPoP message
      if (f_extract_enc_key(vc_eaCertificate, v_public_enc_key, v_compressed_enc_key_mode) == false) {
        log("*** f_http_build_inner_ec_request: ERROR: Non canonical EA certificate ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      if (PICS_SEC_FIXED_KEYS) { // Debug mode: Use fixed values
        v_public_enc_key := 'DD4F6B0DF57C6E3BD0E32B565CACA1D858CEB08A5C2BBAB2C23E203C6DE697FF'O;
        v_compressed_enc_key_mode := 0;
      }
      log("*** f_http_build_inner_ec_request: Public encryption key: ", v_public_enc_key);
      log("*** f_http_build_inner_ec_request: Public encryption key comp: ", v_compressed_enc_key_mode);
      p_salt := vc_eaWholeHash;
      if (PICS_SECPKI_REENROLMENT == false) { // This is the first enrolment, we used Factory keys
        v_ret_code := f_build_pki_secured_request_message_signed_with_pop(PICS_ITS_S_SIGN_NITSP256_PRIVATE_KEY, valueof(m_signerIdentifier_self), vc_eaHashedId8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_inner_ec_request_signed_for_pop(v_inner_ec_request_signed_for_pop))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash);
      } else { // We use last valid EC certificate
        var Oct32 v_ec_private_key := PX_EC_PRIVATE_KEY;
        var HashedId8 v_ec_hashed_id8 := PX_EC_HASHED_ID8;
        // Retrieve EC certificate from the first enrolment
        v_ret_code := f_build_pki_secured_request_message_signed_with_pop(v_ec_private_key, valueof(m_signerIdentifier_digest(v_ec_hashed_id8)), v_ec_hashed_id8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_inner_ec_request_signed_for_pop(v_inner_ec_request_signed_for_pop))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash);
      }
      if (v_ret_code == false) {
        log("*** f_http_build_inner_ec_request: ERROR: Failed to generate InnerEcRequestSignedForPop ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log("*** f_http_build_inner_ec_request: p_ieee1609dot2_signed_and_encrypted_data= ", p_ieee1609dot2_signed_and_encrypted_data);
      log("*** f_http_build_inner_ec_request: p_request_hash= ", p_request_hash);
    } // End of function f_http_build_inner_ec_request

    function f_http_build_invalid_enrolment_request(
                                                    out octetstring p_private_key,
                                                    out octetstring p_public_key_compressed,
                                                    out integer p_compressed_mode,
                                                    out Oct16 p_aes_sym_key,
                                                    out Oct16 p_encrypted_sym_key,
                                                    out Oct16 p_authentication_vector,
                                                    out Oct12 p_nonce,
                                                    out octetstring p_salt,
                                                    out Ieee1609Dot2Data p_ieee1609dot2_signed_and_encrypted_data,
                                                    out Oct32 p_request_hash
                                                    ) runs on ItsPkiHttp {
      var InnerEcRequest v_inner_ec_request;
      var Ieee1609Dot2Data v_inner_ec_request_signed_for_pop;
      var octetstring v_public_enc_key;
      var integer v_compressed_enc_key_mode;
      var boolean v_ret_code;
      
      if (f_generate_inner_ec_request(p_private_key, p_public_key_compressed, p_compressed_mode, v_inner_ec_request) == false) {
        log("*** f_http_build_invalid_enrolment_request: ERROR: Failed to generate InnerEcRequest ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log ("f_http_build_invalid_enrolment_request: EC verification private key: ", p_private_key);
      log ("f_http_build_invalid_enrolment_request: EC verification public compressed key: ", p_public_key_compressed);
      log ("f_http_build_invalid_enrolment_request: EC verification public compressed mode: ", p_compressed_mode);
      // Generate InnerEcRequestSignedForPoP
      if (f_generate_inner_ec_request_signed_for_pop(p_private_key, v_inner_ec_request, v_inner_ec_request_signed_for_pop) == false) {
        log("*** f_http_build_invalid_enrolment_request: ERROR: Failed to generate InnerEcRequestSignedForPop ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log("f_http_build_invalid_enrolment_request: v_inner_ec_request_signed_for_pop= ", v_inner_ec_request_signed_for_pop);
      // Modify signature to get an error
      if (ischosen(v_inner_ec_request_signed_for_pop.content.signedData.signature_.ecdsaNistP256Signature)) {
        v_inner_ec_request_signed_for_pop.content.signedData.signature_.ecdsaNistP256Signature.sSig[1] := bit2oct('10101010'B xor4b oct2bit(v_inner_ec_request_signed_for_pop.content.signedData.signature_.ecdsaNistP256Signature.sSig[1]));
      } else {
        v_inner_ec_request_signed_for_pop.content.signedData.signature_.ecdsaBrainpoolP256r1Signature.sSig[1] := bit2oct('10101010'B xor4b oct2bit(v_inner_ec_request_signed_for_pop.content.signedData.signature_.ecdsaBrainpoolP256r1Signature.sSig[1]));
      }
      
      // Secure InnerEcRequestSignedForPoP message
      if (f_extract_enc_key(vc_eaCertificate, v_public_enc_key, v_compressed_enc_key_mode) == false) {
        log("*** f_http_build_invalid_enrolment_request: ERROR: Non canonical EA certificate ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log("*** f_http_build_invalid_enrolment_request: Public encryption key: ", v_public_enc_key);
      log("*** f_http_build_invalid_enrolment_request: Public encryption key comp: ", v_compressed_enc_key_mode);
      p_salt := vc_eaWholeHash;
      if (PICS_SECPKI_REENROLMENT == false) { // This is the first enrolment, we used Factory keys
        v_ret_code := f_build_pki_secured_request_message_signed_with_pop(PICS_ITS_S_SIGN_NITSP256_PRIVATE_KEY, valueof(m_signerIdentifier_self), vc_eaHashedId8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_inner_ec_request_signed_for_pop(v_inner_ec_request_signed_for_pop))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash);
      } else { // We use last valid EC certificate
        var Oct32 v_ec_private_key;
        var HashedId8 v_ec_hashed_id8;
        // Retrieve EC certificate from the first enrolment
        // TODO Set v_ec_private_key & v_ec_hashed_id8
        v_ret_code := f_build_pki_secured_request_message_signed_with_pop(v_ec_private_key, valueof(m_signerIdentifier_digest(v_ec_hashed_id8)), v_ec_hashed_id8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_inner_ec_request_signed_for_pop(v_inner_ec_request_signed_for_pop))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash);
      }
      if (v_ret_code == false) {
        log("*** f_http_build_invalid_enrolment_request: ERROR: Failed to generate InnerEcRequestSignedForPop ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log("*** f_http_build_invalid_enrolment_request: DEBUG: p_ieee1609dot2_signed_and_encrypted_data = ", p_ieee1609dot2_signed_and_encrypted_data);
    } // End of function f_http_build_invalid_enrolment_request

    function f_http_build_authorization_request(
                                                in Certificate p_ec_certificate, // Enrolment credentials certificate
                                                in octetstring p_ec_private_key,
                                                out octetstring p_private_key,
                                                out octetstring p_public_key_compressed,
                                                out integer p_compressed_key_mode,
                                                out octetstring p_private_enc_key,
                                                out octetstring p_public_compressed_enc_key,
                                                out integer p_compressed_enc_key_mode,
                                                out Oct16 p_aes_sym_key,
                                                out Oct16 p_encrypted_sym_key,
                                                out Oct16 p_authentication_vector,
                                                out Oct12 p_nonce,
                                                out octetstring p_salt,
                                                out Ieee1609Dot2Data p_ieee1609dot2_signed_and_encrypted_data,
                                                out Oct32 p_request_hash
                                                ) runs on ItsPkiHttp {
      // Local variables
      var octetstring v_public_key_x;
      var octetstring v_public_key_y;
      var octetstring v_public_enc_key_x;
      var octetstring v_public_enc_key_y;
      var octetstring v_public_enc_key;
      var integer v_compressed_enc_key_mode;
      var InnerAtRequest v_inner_at_request;
      var Ieee1609Dot2Data v_inner_at_request_data;
      var InnerAtRequest v_authorization_request;
      var bitstring v_authorization_request_msg;

      // Generate the InnerAtRequest
      if (f_generate_inner_at_request(vc_eaCertificate, vc_eaHashedId8, p_ec_certificate, p_ec_private_key, p_private_key, p_public_key_compressed, p_compressed_key_mode, p_private_enc_key, p_public_compressed_enc_key, p_compressed_enc_key_mode, v_inner_at_request) == false) {
        log("*** f_http_build_authorization_request: ERROR: Failed to generate AuthorizationValidationRequest ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
        return;
      }
      log("f_http_build_authorization_request: v_inner_at_request= ", v_inner_at_request);
      
      // Secure InnerAtRequest message
      if (f_extract_enc_key(vc_aaCertificate, v_public_enc_key, v_compressed_enc_key_mode) == false) {
        log("*** f_http_build_authorization_request: ERROR: Non canonical AA certificate ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      if (PICS_SEC_FIXED_KEYS) { // Debug mode: Use fixed values
        v_public_enc_key := 'DD4F6B0DF57C6E3BD0E32B565CACA1D858CEB08A5C2BBAB2C23E203C6DE697FF'O;
        v_compressed_enc_key_mode := 0;
      }
      log("*** f_http_build_authorization_request: Public encryption key: ", v_public_enc_key);
      log("*** f_http_build_authorization_request: Public encryption key comp: ", v_compressed_enc_key_mode);
      p_salt := vc_aaWholeHash;
      log("*** f_http_build_authorization_request: p_salt: ", p_salt);
      if (PX_AUTHORIZATION_REQUEST_WITH_POP) {
        if(f_build_pki_secured_request_message_signed_with_pop(PICS_ITS_S_SIGN_NITSP256_PRIVATE_KEY, valueof(m_signerIdentifier_self), vc_aaHashedId8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_authorization_request(v_inner_at_request))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash) == false) {
          log("*** f_http_build_authorization_request: ERROR: Failed to generate Authorization Request ***");
          f_selfOrClientSyncAndVerdict("error", e_error);
        }
      } else { // Only encryption of EtsiTs102941Data/InnerAtRequest
        log("*** f_http_build_authorization_request: POP signature not applied");
        if(f_build_pki_secured_request_message(vc_aaHashedId8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_authorization_request(v_inner_at_request))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash) == false) {
          log("*** f_http_build_authorization_request: ERROR: Failed to generate Authorization Request ***");
          f_selfOrClientSyncAndVerdict("error", e_error);
        }
      }
      log("*** f_http_build_authorization_request: DEBUG: p_ieee1609dot2_signed_and_encrypted_data= ", p_ieee1609dot2_signed_and_encrypted_data);
      log("*** f_http_build_authorization_request: DEBUG: p_request_hash= ", p_request_hash);
    } // End of function f_http_build_authorization_request
    
    function f_http_build_authorization_validation_request(
                                                           in InnerAtRequest p_inner_at_request,
                                                           out octetstring p_private_key,
                                                           out octetstring p_public_key_compressed,
                                                           out integer p_compressed_key_mode,
                                                           out octetstring p_private_enc_key,
                                                           out octetstring p_public_compressed_enc_key,
                                                           out integer p_compressed_enc_key_mode,
                                                           out Oct16 p_aes_sym_key,
                                                           out Oct16 p_encrypted_sym_key,
                                                           out Oct16 p_authentication_vector,
                                                           out Oct12 p_nonce,
                                                           out octetstring p_salt,
                                                           out Ieee1609Dot2Data p_ieee1609dot2_signed_and_encrypted_data,
                                                           out Oct32 p_request_hash
                                                           ) runs on ItsPkiHttp {
      // Local variables
      var AuthorizationValidationRequest v_authorization_validation_request;
      var bitstring v_authorization_validation_request_msg;
      var octetstring v_public_enc_key;
      var integer v_compressed_enc_key_mode;

      // Copy the sharedAtRequest component from the InnerAtRequest received in the AuthorizationRequestMessage
      v_authorization_validation_request.sharedAtRequest := p_inner_at_request.sharedAtRequest;
      // Copy the ecSignature component from the InnerAtRequest received in the AuthorizationRequestMessage or AuthorizationRequestMessageWithPop
      v_authorization_validation_request.ecSignature := p_inner_at_request.ecSignature;
      // Secure the Pki message
      if (f_extract_enc_key(vc_eaCertificate, v_public_enc_key, v_compressed_enc_key_mode) == false) {
        log("*** f_http_build_authorization_validation_request: ERROR: Non canonical EA certificate ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      log("*** f_http_build_authorization_validation_request: Public encryption key: ", v_public_enc_key);
      log("*** f_http_build_authorization_validation_request: Public encryption key comp: ", v_compressed_enc_key_mode);

      // Secure InnerAtRequest message
      if (f_extract_enc_key(vc_eaCertificate, v_public_enc_key, v_compressed_enc_key_mode) == false) {
        log("*** f_http_build_authorization_validation_request: ERROR: Non canonical EA certificate ***");
        f_selfOrClientSyncAndVerdict("error", e_error);
      }
      if (PICS_SEC_FIXED_KEYS) { // Debug mode: Use fixed values
        v_public_enc_key := 'DD4F6B0DF57C6E3BD0E32B565CACA1D858CEB08A5C2BBAB2C23E203C6DE697FF'O;
        v_compressed_enc_key_mode := 0;
      }
      log("*** f_http_build_authorization_validation_request: Public encryption key: ", v_public_enc_key);
      log("*** f_http_build_authorization_validation_request: Public encryption key comp: ", v_compressed_enc_key_mode);
      p_salt := vc_eaWholeHash;
      log("*** f_http_build_authorization_validation_request: p_salt: ", p_salt);
      if (PX_AUTHORIZATION_REQUEST_WITH_POP) {
        if(f_build_pki_secured_request_message_signed_with_pop(PICS_ITS_S_SIGN_NITSP256_PRIVATE_KEY, valueof(m_signerIdentifier_self), vc_eaHashedId8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_authorization_validation_request(v_authorization_validation_request))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash) == false) {
          log("*** f_http_build_authorization_validation_request: ERROR: Failed to generate Authorization Request ***");
          f_selfOrClientSyncAndVerdict("error", e_error);
        }
      } else { // Only encryption of EtsiTs102941Data/InnerAtRequest
        log("*** f_http_build_authorization_validation_request: POP signature not applied");
        if(f_build_pki_secured_request_message(vc_eaHashedId8/*recipientId*/, v_public_enc_key, v_compressed_enc_key_mode, p_salt, bit2oct(encvalue(m_etsiTs102941Data_authorization_validation_request(v_authorization_validation_request))), p_ieee1609dot2_signed_and_encrypted_data, p_aes_sym_key, p_encrypted_sym_key, p_authentication_vector, p_nonce, p_request_hash) == false) {
          log("*** f_http_build_authorization_validation_request: ERROR: Failed to generate Authorization Request ***");
          f_selfOrClientSyncAndVerdict("error", e_error);
        }
      }
      log("*** f_http_build_authorization_validation_request: DEBUG: p_ieee1609dot2_signed_and_encrypted_data= ", p_ieee1609dot2_signed_and_encrypted_data);
      log("*** f_http_build_authorization_validation_request: DEBUG: p_request_hash= ", p_request_hash);
    } // End of function f_http_build_authorization_validation_request
    
  } // End of group http

  group generate_certificates {

    function f_generate_ec_certificate(
                                       out octetstring p_private_key,
                                       out Certificate p_ec_certificate
                                       ) return boolean {
      var octetstring v_public_key_x;
      var octetstring v_public_key_y;
      var octetstring p_public_key_compressed;
      var integer p_compressed_mode;
      var EccP256CurvePoint v_ecc_p256_curve_point;
      var SequenceOfPsidSsp v_appPermissions := { // ETSI TS 102 965 Table A.1: ETSI ITS standardized ITS-AIDs
        valueof(m_appPermissions(36, { bitmapSsp := '830001'O })), 
        valueof(m_appPermissions(37, { bitmapSsp := '830001'O })) 
      };
      var template (value) EtsiTs103097Certificate v_cert;
      var bitstring v_tbs;
      var Oct32 v_sig;
      var bitstring v_enc_msg;
      var PublicVerificationKey v_public_verification_key;
      
      log(">>> f_generate_ec_certificate");
      
      // Generate verification keys for the certificate
      if (f_generate_key_pair(p_private_key, v_public_key_x, v_public_key_y, p_public_key_compressed, p_compressed_mode) == false) {
        log("f_generate_ec_certificate: Failed to generate verification key");
        return false;
      }
      if (p_compressed_mode == 0) {
        v_ecc_p256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(p_public_key_compressed));
      } else {
        v_ecc_p256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(p_public_key_compressed));
      }

      if (PX_EC_ALG == e_nist_p256) {
        v_public_verification_key := valueof(
                                             m_publicVerificationKey_ecdsaNistP256(
                                                                                   v_ecc_p256_curve_point
                                                                                   ));
      } else if (PX_EC_ALG == e_brainpool_p256_r1) {
        v_public_verification_key := valueof(
                                             m_publicVerificationKey_ecdsaBrainpoolP256r1(
                                                                                          v_ecc_p256_curve_point
                                                                                          ));
      } else {
        log("f_generate_ec_certificate: Wrong encryption algorithm, check PX_EC_ALG");
        return false;
      }
      v_cert := m_etsiTs103097Certificate(
                                          m_issuerIdentifier_sha256AndDigest(f_HashedId8FromSha256(f_hashWithSha256('616263'O))),
                                          m_toBeSignedCertificate_at(
                                                                     v_appPermissions,
                                                                     m_verificationKeyIndicator_verificationKey(
                                                                                                                v_public_verification_key
                                                                                                                ),
                                                                     m_validityPeriod(
                                                                                      f_getCurrentTime() / 1000,
                                                                                      m_duration_years(1)
                                                                                      ),
                                                                     m_geographicRegion_identifiedRegion(
                                                                                                         {
                                                                                                           m_identifiedRegion_country_only(12), 
                                                                                                           m_identifiedRegion_country_only(34)
                                                                                                           }
                                                                                                         )
                                                                     )
                                          );
      // Encode it ==> Get octetstring
      v_tbs := encvalue(v_cert.toBeSigned);
      // Sign the certificate
      v_sig := f_signWithEcdsa(bit2oct(v_tbs), int2oct(11, 32), p_private_key);
      if ((PX_VE_ALG == e_nist_p256) or (PX_VE_ALG == e_brainpool_p256_r1)) {
        v_cert.signature_ := m_signature_ecdsaNistP256(
                                                       m_ecdsaP256Signature(
                                                                            m_eccP256CurvePoint_x_only(
                                                                                                       substr(v_sig, 0, 32)
                                                                                                       ),
                                                                            substr(v_sig, 32, 32)
                                                                            )
                                                       );
      } else if (PX_VE_ALG == e_brainpool_p384_r1) {
        v_cert.signature_ := m_signature_ecdsaBrainpoolP384r1(
                                                              m_ecdsaP384Signature(
                                                                                   m_eccP384CurvePoint_x_only(
                                                                                                              substr(v_sig, 0, 48)
                                                                                                              ),
                                                                                   substr(v_sig, 48, 48)
                                                                                   )
                                                              );
      }
      log("f_generate_ec_certificate: v_cert= ", v_cert);
      
      p_ec_certificate := valueof(v_cert);
      return true;
    } // End of function f_generate_ec_certificate
    
    function f_generate_at_certificate(
                                       in octetstring p_private_key,
                                       in InnerEcRequest p_inner_ec_request,
                                       out Certificate p_at_certificate
                                       ) return boolean {
      var SequenceOfPsidSsp v_appPermissions := { // ETSI TS 102 965 Table A.1: ETSI ITS standardized ITS-AIDs
        valueof(m_appPermissions(36, { bitmapSsp := '830001'O })), 
        valueof(m_appPermissions(37, { bitmapSsp := '830001'O })) 
      };
      var template (value) EtsiTs103097Certificate v_cert;
      var bitstring v_tbs;
      var Oct32 v_sig;
      var bitstring v_enc_msg;
      var PublicVerificationKey v_public_verification_key;
      
      if (PX_EC_ALG == e_nist_p256) {
        v_public_verification_key := valueof(
                                             m_publicVerificationKey_ecdsaNistP256(
                                                                                   p_inner_ec_request.publicKeys.verificationKey.ecdsaNistP256
                                                                                   ));
      } else if (PX_EC_ALG == e_brainpool_p256_r1) {
        v_public_verification_key := valueof(
                                             m_publicVerificationKey_ecdsaBrainpoolP256r1(
                                                                                          p_inner_ec_request.publicKeys.verificationKey.ecdsaBrainpoolP256r1
                                                                                          ));
      } else {
        // Error
        log("f_generate_ec_certificate: Wrong encryption algorithm, check PX_EC_ALG");
        return false;
      }
      v_cert := m_etsiTs103097Certificate(
                                          m_issuerIdentifier_sha256AndDigest(f_HashedId8FromSha256(f_hashWithSha256('616263'O))),
                                          m_toBeSignedCertificate_at(
                                                                     v_appPermissions,
                                                                     m_verificationKeyIndicator_verificationKey(
                                                                                                                v_public_verification_key
                                                                                                                ),
                                                                     m_validityPeriod(
                                                                                      f_getCurrentTime() / 1000,
                                                                                      m_duration_years(1)
                                                                                      ),
                                                                     m_geographicRegion_identifiedRegion(
                                                                                                         {
                                                                                                           m_identifiedRegion_country_only(12), 
                                                                                                           m_identifiedRegion_country_only(34)
                                                                                                           }
                                                                                                         )
                                                                     )
                                          );
      // Encode it ==> Get octetstring
      v_tbs := encvalue(v_cert.toBeSigned);
      
      // Sign the certificate
      v_sig := f_signWithEcdsa(bit2oct(v_tbs), int2oct(11, 32), p_private_key);
      if ((PX_VE_ALG == e_nist_p256) or (PX_VE_ALG == e_brainpool_p256_r1)) {
        v_cert.signature_ := m_signature_ecdsaNistP256(
                                                       m_ecdsaP256Signature(
                                                                            m_eccP256CurvePoint_x_only(
                                                                                                       substr(v_sig, 0, 32)
                                                                                                       ),
                                                                            substr(v_sig, 32, 32)
                                                                            )
                                                       );
      } else if (PX_VE_ALG == e_brainpool_p384_r1) {
        v_cert.signature_ := m_signature_ecdsaBrainpoolP384r1(
                                                              m_ecdsaP384Signature(
                                                                                   m_eccP384CurvePoint_x_only(
                                                                                                              substr(v_sig, 0, 48)
                                                                                                              ),
                                                                                   substr(v_sig, 48, 48)
                                                                                   )
                                                              );
      }
      log("v_cert= ", v_cert);
      
      p_at_certificate := valueof(v_cert);
      return true;
    } // End of function f_generate_at_certificate
    
  } // End of group generate_certificates 
  
  group inner_ec_xxx {
    
    function f_generate_inner_ec_request(
                                         out octetstring p_private_key,
                                         out octetstring p_public_key_compressed,
                                         out integer p_compressed_mode,
                                         out InnerEcRequest p_inner_ec_request
                                         ) return boolean {
      // Local variables
      var Oct32 v_publicKeyX;
      var Oct32 v_publicKeyY;
      var EccP256CurvePoint v_eccP256_curve_point;

      log (">>> f_generate_inner_ec_request");
      // Generate keys for the certificate to be requested
      if (f_generate_key_pair(p_private_key, v_publicKeyX, v_publicKeyY, p_public_key_compressed, p_compressed_mode) == false) {
        log ("f_generate_inner_ec_request: failed to generate keys");
        return false;
      }
      if (p_compressed_mode == 0) {
        v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(p_public_key_compressed));
      } else {
        v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(p_public_key_compressed));
      }
      // Build the Proof of Possession InnerEcRequest
      p_inner_ec_request := valueof(
                                    m_innerEcRequest(
                                                     PICS_ITS_S_CANONICAL_ID,
                                                     m_publicKeys(
                                                                  m_publicVerificationKey_ecdsaNistP256(v_eccP256_curve_point)
                                                                  ),
                                                     m_certificateSubjectAttributes(
                                                                                    { // ETSI TS 102 965 Table A.1: ETSI ITS standardized ITS-AIDs
                                                                                      valueof(m_appPermissions(c_its_aid_SCR, { bitmapSsp := '00C0'O }))
                                                                                    },
                                                                                    m_validityPeriod(
                                                                                                     f_getCurrentTime() / 1000,
                                                                                                     m_duration_years(1) // TODO Use PIXIT
                                                                                                     ),
                                                                                    m_geographicRegion_identifiedRegion(
                                                                                                                        {
                                                                                                                          m_identifiedRegion_country_only(12), // TODO Use PIXIT
                                                                                                                          m_identifiedRegion_country_only(34) // TODO Use PIXIT
                                                                                                                          }
                                                                                                                        ),
                                                                                    'C0'O // TODO Use PIXIT
                                                                                    )
                                                     )
                                    );
      log ("f_generate_inner_ec_request: ", p_inner_ec_request);
      
      return true;
    } // End of function f_generate_inner_ec_request
    
    function f_generate_inner_ec_request_signed_for_pop(
                                                        in octetstring p_private_key,
                                                        in InnerEcRequest p_inner_ec_request,
                                                        out Ieee1609Dot2Data p_inner_ec_request_signed_for_pop
    ) return boolean {
      // Local variables
      var template (value) EccP256CurvePoint v_eccP256_curve_point;
      var octetstring v_encoded_inner_ec_request;
      var template (value) ToBeSignedData v_tbs;
      var octetstring v_tbs_signed;
      var Signature v_signature;
      
      // Encode it
      v_encoded_inner_ec_request := bit2oct(encvalue(p_inner_ec_request));
      // Signed the encoded InnerEcRequestSignedForPop
      v_tbs := m_toBeSignedData(
                                m_signedDataPayload(
                                                    m_etsiTs103097Data_unsecured(
                                                                                 v_encoded_inner_ec_request
                                                                                 )
                                                   ),
                                m_headerInfo_inner_ec_request(
                                                              c_its_aid_SCR,
                                                              f_getCurrentTimeUtc()
                                                              )
                               );
      // Signed the encoded InnerEcRequestSignedForPop
      v_tbs_signed := f_signWithEcdsa(bit2oct(encvalue(v_tbs)), int2oct(0, 32), p_private_key);
      // Finalyse signed InnerEcRequestSignedForPop
      if (PX_VE_ALG == e_nist_p256) {
        v_signature := valueof(
                               m_signature_ecdsaNistP256(
                                                         m_ecdsaP256Signature(
                                                                              m_eccP256CurvePoint_x_only(
                                                                                                         substr(v_tbs_signed, 0, 32)
                                                                                                         ),
                                                                              substr(v_tbs_signed, 32, 32)
                                                                              )
                                                         )
                               );
      } else if (PX_VE_ALG == e_brainpool_p256_r1) {
        v_signature := valueof(
                               m_signature_ecdsaBrainpoolP256r1(
                                                                m_ecdsaP256Signature(
                                                                                     m_eccP256CurvePoint_x_only(
                                                                                                                substr(v_tbs_signed, 0, 32)
                                                                                                                ),
                                                                                     substr(v_tbs_signed, 32, 32)
                                                                                     )
                                                                )
                               );
      } else if (PX_VE_ALG == e_brainpool_p384_r1) {
        v_signature := valueof(
                               m_signature_ecdsaBrainpoolP384r1(
                                                                m_ecdsaP384Signature(
                                                                                     m_eccP384CurvePoint_x_only(
                                                                                                                substr(v_tbs_signed, 0, 48)
                                                                                                                ),
                                                                                     substr(v_tbs_signed, 48, 48)
                                                                                     )
                                                                )
                               );
      }
      log("f_generate_inner_ec_request_signed_for_pop: v_signature= ", v_signature);
      p_inner_ec_request_signed_for_pop := valueof(
                                                   m_etsiTs103097Data_signed(
                                                                             m_signedData(
                                                                                          sha256,
                                                                                          v_tbs,
                                                                                          m_signerIdentifier_self,
                                                                                          v_signature
                                                                                          )
                                                                             )
                                                   );
      
      log("<<< f_generate_inner_ec_request_signed_for_pop: p_inner_ec_request_signed_for_pop= ", p_inner_ec_request_signed_for_pop);
      return true;
    } // End of function f_generate_inner_ec_request_signed_for_pop
    
    function f_generate_inner_ec_response(
                                          in octetstring p_inner_ec_request_hash,
                                          in EtsiTs103097Certificate p_certificate,
                                          out InnerEcResponse p_inner_ec_response
                                         ) return boolean {
      // Local variables
      
      // Build the Proof of Possession InnerEcResponse
      p_inner_ec_response := valueof(
                                     m_innerEcResponse_ok(
                                                          substr(p_inner_ec_request_hash, 0, 16),
                                                          p_certificate
                                                          )
                                     );
      
      return true;
    } // End of function f_generate_inner_ec_response
    
  } // End of group inner_ec_xxx

  group inner_at_xxx {

    function f_generate_inner_at_request(
                                         in Certificate p_ea_certificate,
                                         in Oct8 p_ea_hashed_id8,
                                         in Certificate p_ec_certificate,
                                         in octetstring p_ec_private_key,
                                         out octetstring p_private_key,
                                         out octetstring p_public_key_compressed,
                                         out integer p_compressed_key_mode,
                                         out octetstring p_private_enc_key,
                                         out octetstring p_public_compressed_enc_key,
                                         out integer p_compressed_enc_key_mode,
                                         out InnerAtRequest p_inner_at_request
                                         ) return boolean {
      // Local variables
      var octetstring v_public_key_x;
      var octetstring v_public_key_y;
      var octetstring v_public_enc_key_x;
      var octetstring v_public_enc_key_y;
      var bitstring v_enc_value;
      var octetstring v_ec_hash;
      var Oct8 v_ec_hashed_id8;
      var octetstring public_enc_key_x;
      var octetstring public_enc_key_y;
      var Oct32 v_hmac_key;
      var octetstring v_message_to_tag;
      var Oct16 v_key_tag;
      var octetstring v_hash_shared_at_request;
      var template (value) ToBeSignedData v_tbs;
      var octetstring v_tbs_signed;
      var Ieee1609Dot2Data v_signed_ec_signature;
      var template (value) EccP256CurvePoint v_eccP256_curve_point;
      var template (value) EccP256CurvePoint v_enc_eccP256_curve_point;
      var HashAlgorithm v_hashId;
      var Signature v_signature;

      // Generate verification keys for the certificate to be requested
      if (f_generate_key_pair(p_private_key, v_public_key_x, v_public_key_y, p_public_key_compressed, p_compressed_key_mode) == false) {
        log("f_generate_inner_at_request: Failed to generate verification key");
        return false;
      }
      log ("f_generate_inner_at_request: AT verification private key: ", p_private_key);
      log ("f_generate_inner_at_request: AT verification public compressed key: ", p_public_key_compressed);
      log ("f_generate_inner_at_request: AT verification public compressed mode: ", p_compressed_key_mode);
      // Generate encryption keys for the certificate to be requested
      if (PX_INCLUDE_ENCRYPTION_KEYS) {
        if (f_generate_key_pair(p_private_enc_key, v_public_enc_key_x, v_public_enc_key_y, p_public_compressed_enc_key, p_compressed_enc_key_mode) == false) {
          log("f_generate_inner_at_request: Failed to generate encryption key");
          return false;
        }
      } else {
        p_private_enc_key := ''O;
        p_public_compressed_enc_key := ''O;
        p_compressed_enc_key_mode := -1;
      }
      
      // Calculate the whole certificate SHA
      v_enc_value := encvalue(p_ec_certificate);
      if (ischosen(p_ec_certificate.issuer.sha256AndDigest)) {
        v_ec_hash := f_hashWithSha256(bit2oct(v_enc_value));
        v_ec_hashed_id8 := f_HashedId8FromSha256(v_ec_hash);
      } else {
        v_ec_hash := f_hashWithSha384(bit2oct(v_enc_value));
        v_ec_hashed_id8 := f_HashedId8FromSha384(v_ec_hash);
      }
      log("f_generate_inner_at_request: v_ec_hash= ", v_ec_hash);
      
      // Generate 32 octets length secret key
      v_hmac_key := f_hashWithSha256(int2oct(f_getCurrentTime(), 12));
      log("f_generate_inner_at_request: v_hmac_key= ", v_hmac_key);

      // Generate tag based on the concatenation of verification keys & encryption keys
      v_message_to_tag := v_public_key_x & v_public_key_y & v_public_enc_key_x & v_public_enc_key_y;
      log("f_generate_inner_at_request: v_message_to_tag= ", v_message_to_tag); // FIXME encryption keys could be optional
      v_key_tag := fx_hmac_sha256(v_hmac_key, v_message_to_tag); // TODO Rename and use a wrapper function
      log("f_generate_inner_at_request: v_key_tag= ", v_key_tag);

      // Build the SharedAtRequest
      p_inner_at_request.sharedAtRequest := valueof(
                                                    m_shared_at_request(
                                                                        p_ea_hashed_id8, // eaId identifies the EA certificate shared with EA entity
                                                                        substr(v_key_tag, 0, 16), // Calculated keyTag
                                                                        valueof(
                                                                                m_certificate_subject_attributes( // FIXME Review subjectPermissions
                                                                                                                 p_ec_certificate.toBeSigned.appPermissions,
                                                                                                                 { { subjectPermissions := { all_ := NULL }, minChainLength := 1, chainLengthRange   := 0, eeType := '00000000'B } },
                                                                                                                 p_ec_certificate.toBeSigned.id,
                                                                                                                 p_ec_certificate.toBeSigned.validityPeriod,
                                                                                                                 p_ec_certificate.toBeSigned.region,
                                                                                                                 p_ec_certificate.toBeSigned.assuranceLevel
                                                                                                                  ))) // Desired attributes
                                                    );
      // Calculate the hash of the SharedAtRequest
      v_hash_shared_at_request := f_hashWithSha256(bit2oct(encvalue(p_inner_at_request.sharedAtRequest)));
      log("f_generate_inner_at_request: v_hash_shared_at_request= ", v_hash_shared_at_request);
      
      // Build the ETsiTs103097Data-SignedExternalPayload
      v_tbs := m_toBeSignedData(
                                m_signedDataPayload_ext(v_hash_shared_at_request), // Payload containing extDataHash
                                m_headerInfo_inner_ec_request( // HeaderInfo
                                                              c_its_aid_SCR,
                                                              f_getCurrentTimeUtc())
                               );
      log("f_generate_inner_at_request: v_tbs= ", v_tbs);
      // Signed ToBeSigned payload using the private key of EC certificate obtained from Enrolment request
      // In case of ITS-S privacy, v_signed_ec_signature contained the data to be encrypted
      if (ischosen(p_ec_certificate.signature_.ecdsaBrainpoolP384r1Signature)) {
        v_hashId := sha384;
        v_tbs_signed := f_signWithEcdsaBrainpoolp384WithSha384(bit2oct(encvalue(v_tbs)), v_ec_hash, p_ec_private_key);
        v_signature := valueof(
                               m_signature_ecdsaBrainpoolP384r1(
                                                                m_ecdsaP384Signature(
                                                                                     m_eccP384CurvePoint_x_only(
                                                                                                                substr(v_tbs_signed, 0, 48)
                                                                                                                ),
                                                                                     substr(v_tbs_signed, 48, 48)
                                                                                     )
                                                                )
                                                        );
      } else {
        v_hashId := sha256;
        if (ischosen(p_ec_certificate.signature_.ecdsaBrainpoolP256r1Signature)) {
          v_tbs_signed := f_signWithEcdsaBrainpoolp256WithSha256(bit2oct(encvalue(v_tbs)), v_ec_hash, p_ec_private_key);
          v_signature := valueof(
                                 m_signature_ecdsaBrainpoolP256r1(
                                                                  m_ecdsaP256Signature(