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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,
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_verify_inner_ec_request_signed_for_pop(
in EtsiTs102941Data p_etsi_ts_102941_data,
out InnerEcRequest p_inner_ec_request
) return boolean {
var bitstring v_msg_bit;
log(">>> f_verify_inner_ec_request_signed_for_pop: ", p_etsi_ts_102941_data);
// 1. Decode content
v_msg_bit := oct2bit(p_etsi_ts_102941_data.content.enrolmentRequest.content.signedData.tbsData.payload.data.content.unsecuredData);
if (decvalue(v_msg_bit, p_inner_ec_request) != 0) {
log("f_verify_inner_ec_request_signed_for_pop: Failed to decode InnerEcRequest");
return false;
} else {
log("f_verify_inner_ec_request_signed_for_pop: v_inner_ec_request= ", p_inner_ec_request);
// 2. Verify the InnerEcRequestSignedForPop signature
}
return true;
} // End of function f_verify_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
group inner_at_xxx {
function f_generate_inner_at_request(
in SecurityAlg p_enc_algo := PX_EC_ALG_FOR_EC_SIGN,
in Certificate p_ea_certificate,
in octetstring p_salt,
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 PublicVerificationKey v_public_verification_key;
var BasePublicEncryptionKey v_public_encryption_key;
var octetstring public_enc_key_x;
var octetstring public_enc_key_y;
var PublicVerificationKey v_verification_tag;
var PublicEncryptionKey v_encryption_tag;
var octetstring v_encoded_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_at_signature;
var template (value) EccP256CurvePoint v_eccP256_curve_point;
var HashAlgorithm v_hashId;
var Signature v_signature;
var SequenceOfPsidSsp v_appPermissions := { // ETSI TS 102 965 Table A.1: ETSI ITS standardized ITS-AIDs
valueof(m_appPermissions(c_its_aid_CAM, { bitmapSsp := PX_INNER_AT_CERTFICATE_BITMAP_SSP_CAM })),
valueof(m_appPermissions(c_its_aid_DENM, { bitmapSsp := PX_INNER_AT_CERTFICATE_BITMAP_SSP_DENM }))
log(">>> f_generate_inner_at_request: p_enc_algo=", p_enc_algo);
// 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_for_encryption(p_enc_algo, 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 {
log ("f_generate_inner_at_request: AT encryption private key: ", p_private_enc_key);
log ("f_generate_inner_at_request: AT encryption public compressed key: ", p_public_compressed_enc_key);
log ("f_generate_inner_at_request: AT encryption public compressed mode: ", p_compressed_enc_key_mode);
v_public_enc_key_x := ''O;
v_public_enc_key_y := ''O;
p_public_compressed_enc_key := ''O;
p_compressed_enc_key_mode := -1;
}
// Generate 32 octets length secret key
v_hmac_key := f_hashWithSha256(int2oct((f_getCurrentTimeUtc() * 1000), 12));
log("f_generate_inner_at_request: v_hmac_key= ", v_hmac_key);
// Generate tag based on the concatenation of verification keys & encryption keys
if (f_generate_key_tag(p_public_key_compressed, p_compressed_key_mode, p_public_compressed_enc_key, p_compressed_enc_key_mode, v_encoded_tag) == false) {
log("f_generate_inner_at_request: Failed to generate Key tag");
log("f_generate_inner_at_request: v_encoded_tag= ", v_encoded_tag);
v_key_tag := substr(
fx_hmac_sha256( // TODO Rename and use a wrapper function
v_hmac_key,
),
0,
16); // Leftmost 128 bits of the HMAC-SHA256 tag computed previously
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
m_certificate_subject_attributes( // FIXME Review subjectPermissions
p_ec_certificate.toBeSigned.certRequestPermissions,
{ none_ := NULL },//p_ec_certificate.toBeSigned.id,
p_ec_certificate.toBeSigned.validityPeriod,
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
m_signedDataPayload_ext(v_hash_shared_at_request), // Payload containing extDataHash
m_headerInfo_inner_pki_request( // HeaderInfo
-,
(f_getCurrentTime()) * 1000) //us
log("f_generate_inner_at_request: v_tbs= ", v_tbs);
// Calculate the whole certificate SHA
v_enc_value := encvalue(p_ec_certificate);
if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP384r1)) {
v_ec_hash := f_hashWithSha384(bit2oct(v_enc_value));
v_ec_hashed_id8 := f_HashedId8FromSha384(v_ec_hash);
} else {
v_ec_hash := f_hashWithSha256(bit2oct(v_enc_value));
v_ec_hashed_id8 := f_HashedId8FromSha256(v_ec_hash);
}
log("f_generate_inner_at_request: v_ec_hash= ", v_ec_hash);
// Signed ToBeSigned payload using the private key of EC certificate obtained from Enrolment request
// In case of ITS-S privacy, v_signed_at_signature contained the data to be encrypted
if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP384r1)) {
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.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP256r1)) {
v_tbs_signed := f_signWithEcdsaBrainpoolp256WithSha256(bit2oct(encvalue(v_tbs)), v_ec_hash, p_ec_private_key);
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 (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaNistP256)) {
v_tbs_signed := f_signWithEcdsaNistp256WithSha256(bit2oct(encvalue(v_tbs)), v_ec_hash, p_ec_private_key);
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 {
// Error
log("f_generate_inner_at_request: Failed to process signature");
return false;
}
v_signed_at_signature := valueof(
m_etsiTs103097Data_signed(
m_signedData(
m_signerIdentifier_digest(v_ec_hashed_id8), // Signer is thehasheId8 of the EC certificate obtained from Enrolment request
log("f_generate_inner_at_request: v_signed_at_signature= ", v_signed_at_signature);
log("f_generate_inner_at_request: p_ea_certificate= ", p_ea_certificate);
if (PICS_ITS_S_WITH_PRIVACY) { // Build EtsiTs102097Data-Encrypted structure
var octetstring v_public_enc_key;
var integer v_compressed_mode;
var Oct12 v_nonce;
var Oct16 v_authentication_vector;
var Oct16 v_encrypted_sym_key;
var HashedId8 v_recipientId;
var octetstring v_public_compressed_ephemeral_key;
var integer v_public_compressed_ephemeral_mode;
var octetstring v_enc_signed_ec_signature;
var EncryptedDataEncryptionKey v_encrypted_data_encryption_key;
// Use EA certificate for the encryption
if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_0)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_0;
} else if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_1)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_1;
v_compressed_mode := 1;
} else {
log("f_generate_inner_at_request: Wrong NistP256 encryption variant");
return false;
}
v_enc_signed_ec_signature := f_encryptWithEciesNistp256WithSha256(bit2oct(encvalue(v_signed_at_signature)), v_public_enc_key, v_compressed_mode, p_salt, v_public_compressed_ephemeral_key, v_public_compressed_ephemeral_mode, v_aes_sym_key, v_encrypted_sym_key, v_authentication_vector, v_nonce, PICS_SEC_FIXED_KEYS);
if (v_public_compressed_ephemeral_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_compressed_ephemeral_key));
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_compressed_ephemeral_key));
v_encrypted_data_encryption_key := valueof(
m_encryptedDataEncryptionKey_eciesNistP256(
m_evciesP256EncryptedKey(
v_eccP256_curve_point,
v_encrypted_sym_key,
v_authentication_vector
)));
} else if (p_enc_algo == e_brainpool_p256_r1) {
if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_0)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_0;
} else if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_1)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_1;
v_compressed_mode := 1;
} else {
log("f_generate_inner_at_request: Wrong BrainpoolP256r1 encryption variant");
return false;
}
v_enc_signed_ec_signature := f_encryptWithEciesBrainpoolp256WithSha256(bit2oct(encvalue(v_signed_at_signature)), v_public_enc_key, v_compressed_mode, p_salt, v_public_compressed_ephemeral_key, v_public_compressed_ephemeral_mode, v_aes_sym_key, v_encrypted_sym_key, v_authentication_vector, v_nonce, PICS_SEC_FIXED_KEYS);
if (v_public_compressed_ephemeral_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_compressed_ephemeral_key));
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_compressed_ephemeral_key));
v_encrypted_data_encryption_key := valueof(
m_encryptedDataEncryptionKey_eciesBrainpoolP256r1(
m_evciesP256EncryptedKey(
v_eccP256_curve_point,
v_encrypted_sym_key,
v_authentication_vector
)));
log("f_generate_inner_at_request: Wrong encryption variant");
log("f_generate_inner_at_request: v_encrypted_data_encryption_key= ", v_encrypted_data_encryption_key);
v_recipientId := p_ea_hashed_id8; // RecipientId is the HashedId8 of the EA certificate
log("f_generate_inner_at_request: v_recipientId= ", v_recipientId);
// Fill Certificate template with the public compressed keys (canonical form)
p_inner_at_request.ecSignature := valueof(
m_ec_signature(
m_etsiTs103097Data_encrypted(
m_encryptedData(
{
m_recipientInfo_certRecipInfo(
m_pKRecipientInfo(
v_recipientId,
v_encrypted_data_encryption_key ))
},
m_SymmetricCiphertext_aes128ccm(
m_aesCcmCiphertext(
v_enc_signed_ec_signature
)
)
)
} else { // Skip the encryption, alowed to be re-identified by the AA
p_inner_at_request.ecSignature := valueof(m_ec_signature_ext_payload(v_signed_at_signature));
// Build the InnerAtRequest, EcSignature field is already set
if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaNistP256)) {
if (p_compressed_key_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_key_x));
} else {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_key_x));
}
v_public_verification_key := valueof(m_publicVerificationKey_ecdsaNistP256(v_eccP256_curve_point));
} else if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP256r1)) {
if (p_compressed_key_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_key_x));
} else {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_key_x));
}
v_public_verification_key := valueof(m_publicVerificationKey_ecdsaBrainpoolP256r1(v_eccP256_curve_point));
var EccP384CurvePoint v_eccP384_curve_point;
if (p_compressed_key_mode == 0) {
v_eccP384_curve_point := valueof(m_eccP384CurvePoint_compressed_y_0(v_public_key_x));
} else {
v_eccP384_curve_point := valueof(m_eccP384CurvePoint_compressed_y_1(v_public_key_x));
}
v_public_verification_key := valueof(m_publicVerificationKey_ecdsaBrainpoolP384r1(v_eccP384_curve_point));
var template (value) EccP256CurvePoint v_enc_eccP256_curve_point;
if (p_compressed_enc_key_mode == 0) {
v_enc_eccP256_curve_point := m_eccP256CurvePoint_compressed_y_0(v_public_enc_key_x);
} else {
v_enc_eccP256_curve_point := m_eccP256CurvePoint_compressed_y_1(v_public_enc_key_x);
}
v_public_encryption_key := valueof(m_publicEncryptionKey_eciesNistP256(v_enc_eccP256_curve_point));
} else {
v_public_encryption_key := valueof(m_publicEncryptionKey_eciesBrainpoolP256r1(v_enc_eccP256_curve_point));
}
p_inner_at_request.publicKeys := valueof( // The freshly generated public verification & encrypition keys to be used for the requested AT certificate
m_publicKeys(
m_encryptionKey( // FIXME Encryption keys could be optional
-,
)
);
} else {
p_inner_at_request.publicKeys := valueof( // The freshly generated public verification keys to be used for the requested AT certificate
m_publicKeys(
p_inner_at_request.hmacKey := v_hmac_key;
log("f_generate_inner_at_request: p_inner_at_request= ", p_inner_at_request);
return true;
} // End of function f_generate_inner_at_request
function f_generate_inner_at_request_with_wrong_parameters(
in Certificate p_aa_certificate,
in SecurityAlg p_enc_algo := PX_EC_ALG_FOR_AT,
in Oct8 p_aa_hashed_id8,
in Certificate p_ea_certificate,
in octetstring p_salt,
in Oct8 p_ea_hashed_id8,
in Certificate p_ec_certificate,
in octetstring p_ec_private_key,
in boolean p_alter_hmac := false,
in boolean p_alter_signer_digest := false,
in template (omit) Time32 p_start := omit,
in template (omit) Duration p_duration := omit,
in template (omit) Time64 p_generation_time := omit,
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 {
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 PublicVerificationKey v_public_verification_key;
var BasePublicEncryptionKey v_public_encryption_key;
var Oct8 v_ec_hashed_id8;
var octetstring public_enc_key_x;
var octetstring public_enc_key_y;
var Oct32 v_hmac_key;
var PublicVerificationKey v_verification_tag;
var PublicEncryptionKey v_encryption_tag;
var octetstring v_encoded_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_at_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;
var Time32 v_start;
var Duration v_duration;
var SequenceOfPsidSsp v_appPermissions := { // ETSI TS 102 965 Table A.1: ETSI ITS standardized ITS-AIDs
valueof(m_appPermissions(c_its_aid_CAM, { bitmapSsp := PX_INNER_AT_CERTFICATE_BITMAP_SSP_CAM })),
valueof(m_appPermissions(c_its_aid_DENM, { bitmapSsp := PX_INNER_AT_CERTFICATE_BITMAP_SSP_DENM }))
log("f_generate_inner_at_request_with_wrong_parameters: p_enc_algo=", p_enc_algo);
// 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_with_wrong_parameters: Failed to generate verification key");
log ("f_generate_inner_at_request_with_wrong_parameters: AT verification private key: ", p_private_key);
log ("f_generate_inner_at_request_with_wrong_parameters: AT verification public compressed key: ", p_public_key_compressed);
log ("f_generate_inner_at_request_with_wrong_parameters: 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_for_encryption(p_enc_algo, 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_with_wrong_parameters: Failed to generate encryption key");
log ("f_generate_inner_at_request_with_wrong_parameters: AT encryption private key: ", p_private_enc_key);
log ("f_generate_inner_at_request_with_wrong_parameters: AT encryption public compressed key: ", p_public_compressed_enc_key);
log ("f_generate_inner_at_request_with_wrong_parameters: AT encryption public compressed mode: ", p_compressed_enc_key_mode);
}
} else {
p_private_enc_key := ''O;
v_public_enc_key_x := ''O;
v_public_enc_key_y := ''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_with_wrong_parameters: v_ec_hash= ", v_ec_hash);
log("f_generate_inner_at_request_with_wrong_parameters: v_ec_hashed_id8= ", v_ec_hashed_id8);
if (p_alter_signer_digest == true) {
v_ec_hashed_id8 := int2oct((f_getCurrentTimeUtc() * 1000), 8);
log("f_generate_inner_at_request_with_wrong_parameters: Altered v_ec_hashed_id8= ", v_ec_hashed_id8);
}
// Generate 32 octets length secret key
v_hmac_key := f_hashWithSha256(int2oct((f_getCurrentTimeUtc() * 1000), 12));
log("f_generate_inner_at_request_with_wrong_parameters: v_hmac_key= ", v_hmac_key);
// Generate tag based on the concatenation of verification keys & encryption keys
if (f_generate_key_tag(p_public_key_compressed, p_compressed_key_mode, p_public_compressed_enc_key, p_compressed_enc_key_mode, v_encoded_tag) == false) {
log("f_generate_inner_at_request_with_wrong_parameters: Failed to generate Key tag");
log("f_generate_inner_at_request_with_wrong_parameters: v_encoded_tag= ", v_encoded_tag);
// Generate hmac key
v_key_tag := substr(
fx_hmac_sha256( // TODO Rename and use a wrapper function
v_hmac_key,
v_encoded_tag
),
0,
16); // Leftmost 128 bits of the HMAC-SHA256 tag computed previously
log("f_generate_inner_at_request_with_wrong_parameters: v_key_tag= ", v_key_tag);
if (p_alter_hmac == true) {
v_hmac_key[0] := 'aa'O;
v_hmac_key[1] := 'bb'O;
log("f_generate_inner_at_request_with_wrong_parameters: Altered key_tag= ", v_hmac_key);
}
if (not(ispresent(p_start))) {
v_start := p_ec_certificate.toBeSigned.validityPeriod.start_;
} else {
v_start := valueof(p_start);
log("f_generate_inner_at_request_with_wrong_parameters: Altered ValidityPeriod.start= ", v_start);
}
if (not(ispresent(p_duration))) {
v_duration := p_ec_certificate.toBeSigned.validityPeriod.duration;
} else {
v_duration := valueof(p_duration);
log("f_generate_inner_at_request_with_wrong_parameters: Altered ValidityPeriod.duration= ", v_duration);
}
p_inner_at_request.sharedAtRequest := valueof(
m_shared_at_request(
p_ea_hashed_id8, // eaId identifies the EA certificate shared with EA entity
v_key_tag, // Calculated keyTag
valueof(
m_certificate_subject_attributes(
p_ec_certificate.toBeSigned.certRequestPermissions,
{ none_ := NULL },//p_ec_certificate.toBeSigned.id,
m_validityPeriod(v_start, v_duration),
p_ec_certificate.toBeSigned.region,
p_ec_certificate.toBeSigned.assuranceLevel
);
// 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_with_wrong_parameters: v_hash_shared_at_request= ", v_hash_shared_at_request);
// Build the ETsiTs103097Data-SignedExternalPayload
if (ispresent(p_generation_time)) {
v_tbs := m_toBeSignedData(
m_signedDataPayload_ext(v_hash_shared_at_request), // Payload containing extDataHash
m_headerInfo_inner_pki_request( // HeaderInfo
-,
valueof(p_generation_time) * 1000) //us
);
log("f_generate_inner_at_request_with_wrong_parameters: Altered generation time: v_tbs= ", v_tbs);
} else {
v_tbs := m_toBeSignedData(
m_signedDataPayload_ext(v_hash_shared_at_request), // Payload containing extDataHash
m_headerInfo_inner_pki_request( // HeaderInfo
-,
f_getCurrentTime() * 1000) //us
);
log("f_generate_inner_at_request_with_wrong_parameters: v_tbs= ", v_tbs);
}
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// Signed ToBeSigned payload using the private key of EC certificate obtained from Enrolment request
// In case of ITS-S privacy, v_signed_at_signature contained the data to be encrypted
// TODO Simplify with f_signWithEcdsa
if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP384r1)) {
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.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP256r1)) {
v_tbs_signed := f_signWithEcdsaBrainpoolp256WithSha256(bit2oct(encvalue(v_tbs)), v_ec_hash, p_ec_private_key);
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 (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaNistP256)) {
v_tbs_signed := f_signWithEcdsaNistp256WithSha256(bit2oct(encvalue(v_tbs)), v_ec_hash, p_ec_private_key);
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 {
// Error
log("f_generate_inner_at_request_with_wrong_parameters: Failed to process signature");
return false;
}
}
v_signed_at_signature := valueof(
m_etsiTs103097Data_signed(
m_signedData(
v_hashId,
v_tbs,
m_signerIdentifier_digest(v_ec_hashed_id8), // Signer is the hasheId8 of the EC certificate obtained from Enrolment request
log("f_generate_inner_at_request_with_wrong_parameters: v_signed_at_signature= ", v_signed_at_signature);
if (PICS_ITS_S_WITH_PRIVACY) { // Build EtsiTs102097Data-Encrypted structure
var octetstring v_public_enc_key;
var integer v_compressed_mode;
var Oct12 v_nonce;
var Oct16 v_authentication_vector;
var Oct16 v_aes_sym_key;
var Oct16 v_encrypted_sym_key;
var HashedId8 v_recipientId;
var octetstring v_public_compressed_ephemeral_key;
var integer v_public_compressed_ephemeral_mode;
var octetstring v_enc_signed_ec_signature;
var EncryptedDataEncryptionKey v_encrypted_data_encryption_key;
// Use EA certificate for the encryption
if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_0)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_0;
v_compressed_mode := 0;
} else if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_1)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesNistP256.compressed_y_1;
v_compressed_mode := 1;
} else {
log("f_generate_inner_at_request_with_wrong_parameters: Wrong NistP256 encryption variant");
return false;
}
v_enc_signed_ec_signature := f_encryptWithEciesNistp256WithSha256(bit2oct(encvalue(v_signed_at_signature)), v_public_enc_key, v_compressed_mode, p_salt, v_public_compressed_ephemeral_key, v_public_compressed_ephemeral_mode, v_aes_sym_key, v_encrypted_sym_key, v_authentication_vector, v_nonce, PICS_SEC_FIXED_KEYS);
if (v_public_compressed_ephemeral_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_compressed_ephemeral_key));
} else {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_compressed_ephemeral_key));
}
v_encrypted_data_encryption_key := valueof(
m_encryptedDataEncryptionKey_eciesNistP256(
m_evciesP256EncryptedKey(
v_eccP256_curve_point,
v_encrypted_sym_key,
v_authentication_vector
)));
} else if (p_enc_algo == e_brainpool_p256_r1) {
if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_0)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_0;
v_compressed_mode := 0;
} else if (ischosen(p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_1)) {
v_public_enc_key := p_ea_certificate.toBeSigned.encryptionKey.publicKey.eciesBrainpoolP256r1.compressed_y_1;
v_compressed_mode := 1;
} else {
log("f_generate_inner_at_request_with_wrong_parameters: Wrong BrainpoolP256r1 encryption variant");
return false;
}
v_enc_signed_ec_signature := f_encryptWithEciesBrainpoolp256WithSha256(bit2oct(encvalue(v_signed_at_signature)), v_public_enc_key, v_compressed_mode, p_salt, v_public_compressed_ephemeral_key, v_public_compressed_ephemeral_mode, v_aes_sym_key, v_encrypted_sym_key, v_authentication_vector, v_nonce, PICS_SEC_FIXED_KEYS);
if (v_public_compressed_ephemeral_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_compressed_ephemeral_key));
} else {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_compressed_ephemeral_key));
}
v_encrypted_data_encryption_key := valueof(
m_encryptedDataEncryptionKey_eciesBrainpoolP256r1(
m_evciesP256EncryptedKey(
v_eccP256_curve_point,
v_encrypted_sym_key,
v_authentication_vector
)));
} else {
log("f_generate_inner_at_request_with_wrong_parameters: Wrong encryption variant");
log("f_generate_inner_at_request_with_wrong_parameters: v_encrypted_data_encryption_key= ", v_encrypted_data_encryption_key);
v_recipientId := p_ea_hashed_id8; // RecipientId is the HashedId8 of the EA certificate
log("f_generate_inner_at_request_with_wrong_parameters: v_recipientId= ", v_recipientId);
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// Fill Certificate template with the public compressed keys (canonical form)
p_inner_at_request.ecSignature := valueof(
m_ec_signature(
m_etsiTs103097Data_encrypted(
m_encryptedData(
{
m_recipientInfo_certRecipInfo(
m_pKRecipientInfo(
v_recipientId,
v_encrypted_data_encryption_key ))
},
m_SymmetricCiphertext_aes128ccm(
m_aesCcmCiphertext(
v_nonce,
v_enc_signed_ec_signature
)
)
)
)
)
);
} else { // Skip the encryption, alowed to be re-identified by the AA
p_inner_at_request.ecSignature := valueof(m_ec_signature_ext_payload(v_signed_at_signature));
}
// Build the InnerAtRequest, EcSignature field is already set
if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaNistP256)) {
if (p_compressed_key_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_key_x));
} else {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_key_x));
}
v_public_verification_key := valueof(m_publicVerificationKey_ecdsaNistP256(v_eccP256_curve_point));
} else if (ischosen(p_ec_certificate.toBeSigned.verifyKeyIndicator.verificationKey.ecdsaBrainpoolP256r1)) {
if (p_compressed_key_mode == 0) {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_0(v_public_key_x));
} else {
v_eccP256_curve_point := valueof(m_eccP256CurvePoint_compressed_y_1(v_public_key_x));
}
v_public_verification_key := valueof(m_publicVerificationKey_ecdsaBrainpoolP256r1(v_eccP256_curve_point));
var EccP384CurvePoint v_eccP384_curve_point;
if (p_compressed_key_mode == 0) {
v_eccP384_curve_point := valueof(m_eccP384CurvePoint_compressed_y_0(v_public_key_x));
} else {
v_eccP384_curve_point := valueof(m_eccP384CurvePoint_compressed_y_1(v_public_key_x));
}
v_public_verification_key := valueof(m_publicVerificationKey_ecdsaBrainpoolP384r1(v_eccP384_curve_point));
if (p_compressed_enc_key_mode == 0) {
v_enc_eccP256_curve_point := m_eccP256CurvePoint_compressed_y_0(v_public_enc_key_x);
} else {
v_enc_eccP256_curve_point := m_eccP256CurvePoint_compressed_y_1(v_public_enc_key_x);
}
v_public_encryption_key := valueof(m_publicEncryptionKey_eciesNistP256(v_enc_eccP256_curve_point));
} else {
v_public_encryption_key := valueof(m_publicEncryptionKey_eciesBrainpoolP256r1(v_enc_eccP256_curve_point));
}
p_inner_at_request.publicKeys := valueof( // The freshly generated public verification & encrypition keys to be used for the requested AT certificate
m_publicKeys(
m_encryptionKey( // FIXME Encryption keys could be optional
-,
)
);
} else {
p_inner_at_request.publicKeys := valueof( // The freshly generated public verification keys to be used for the requested AT certificate
m_publicKeys(
)
);
}
p_inner_at_request.hmacKey := v_hmac_key;
log("f_generate_inner_at_request_with_wrong_parameters: p_inner_at_request= ", p_inner_at_request);
} // End of function f_generate_inner_at_request_with_wrong_parameters
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function f_verify_inner_at_request_signed_for_pop(
in EtsiTs102941Data p_etsi_ts_102941_data,
out InnerAtRequest p_inner_at_request
) return boolean {
var bitstring v_msg_bit;
log(">>> f_verify_inner_at_request_signed_for_pop: ", p_etsi_ts_102941_data);
// 1. Decode content
v_msg_bit := oct2bit(p_etsi_ts_102941_data.content.enrolmentRequest.content.signedData.tbsData.payload.data.content.unsecuredData);
if (decvalue(v_msg_bit, p_inner_at_request) != 0) {
log("f_verify_inner_at_request_signed_for_pop: Failed to decode InnerEcRequest");
return false;
} else {
log("f_verify_inner_at_request_signed_for_pop: v_inner_at_request= ", p_inner_at_request);
// 2. Verify the InnerEcRequestSignedForPop signature
// TODO
}
return true;
} // End of function f_verify_inner_at_request_signed_for_pop
function f_generate_inner_at_response(
in octetstring p_authorization_request_hash,
in EtsiTs103097Certificate p_certificate,
out InnerAtResponse p_authorization_response
) return boolean {
// Local variables
// Build the Proof of Possession InnerEcResponse
p_authorization_response := valueof(
m_innerAtResponse_ok(
substr(p_authorization_request_hash, 0, 16),
} // End of function f_generate_inner_at_response
} // End of group inner_at_xxx
group authorization_validation_xxx {
} // End of group authorization_validation_xxx
group awaiting_messages {
function f_await_http_inner_ec_request_response(
out Oct32 p_private_key,
out Oct32 p_compressed_public_key,
out integer p_compressed_mode,
out InnerEcResponse p_inner_ec_response,
in boolean p_strict_checks := true
) runs on ItsPkiHttp return boolean {
var HeaderLines v_headers;
var Oct32 v_request_hash;
var Oct16 v_encrypted_sym_key;
var Oct16 v_aes_sym_key;
var HashedId8 v_aes_sym_key_hashed_id8;
var Oct16 v_authentication_vector;
var Oct12 v_nonce;
var octetstring v_salt;
var Ieee1609Dot2Data v_ieee1609dot2_signed_and_encrypted_data;
var EtsiTs102941Data v_etsi_ts_102941_data;
var HttpMessage v_response;
log(">>> f_await_http_inner_ec_request_response: p_strict_checks=", p_strict_checks);
f_http_build_inner_ec_request(p_private_key, p_compressed_public_key, p_compressed_mode, v_aes_sym_key, v_encrypted_sym_key, v_authentication_vector, v_nonce, v_salt, v_ieee1609dot2_signed_and_encrypted_data, v_request_hash);
v_aes_sym_key_hashed_id8 := f_HashedId8FromSha256(f_hashWithSha256('80'O & v_aes_sym_key)); // Used to macth the response
f_init_default_headers_list(-, "inner_ec_request", v_headers);
f_http_send(
v_headers,
m_http_request(
m_http_request_post(
PICS_HTTP_POST_URI_EC,
v_headers,
m_http_message_body_binary(
m_binary_body_ieee1609dot2_data(
v_ieee1609dot2_signed_and_encrypted_data
)))));
[] a_await_ec_http_request_from_iut(
mw_http_response(
mw_http_response_ok(
mw_http_message_body_binary(
mw_binary_body_ieee1609dot2_data(
mw_enrolmentResponseMessage(
mw_encryptedData(
{ *, mw_recipientInfo_pskRecipInfo(v_aes_sym_key_hashed_id8), * },
mw_SymmetricCiphertext_aes128ccm
)))))),
v_response
) {
if (f_verify_pki_response_message(p_private_key, v_aes_sym_key, v_authentication_vector, vc_eaWholeHash, v_response.response.body.binary_body.ieee1609dot2_data, p_strict_checks, -, v_etsi_ts_102941_data) == false) {
log("f_await_http_inner_ec_request_response: Failed to verify PKI message ***");
log("f_await_http_inner_ec_request_response: Receive ", v_etsi_ts_102941_data, " ***");
// Verify the received EC certificate
log("f_await_http_inner_ec_request_response: match ", match(v_etsi_ts_102941_data.content, mw_enrolmentResponse(mw_innerEcResponse_ok(substr(v_request_hash, 0, 16), mw_etsiTs103097Certificate(-, mw_toBeSignedCertificate_ec)))), " ***"); // TODO In TITAN, this is the only way to get the unmatching in log
if (match(v_etsi_ts_102941_data.content, mw_enrolmentResponse(mw_innerEcResponse_ok(substr(v_request_hash, 0, 16), mw_etsiTs103097Certificate(-, mw_toBeSignedCertificate_ec)))) == false) {
log("f_await_http_inner_ec_request_response: Unexpected message received ***");
if (p_strict_checks) {
return false;
}
}
Yann Garcia
committed
if (ischosen(v_etsi_ts_102941_data.content.enrolmentResponse) and ispresent(v_etsi_ts_102941_data.content.enrolmentResponse.certificate)) {
if (f_verify_ec_certificate(v_etsi_ts_102941_data.content.enrolmentResponse.certificate, vc_eaCertificate, p_compressed_public_key, p_compressed_mode) == false) {
log("f_await_http_inner_ec_request_response: Cannot verify EC certificate signature ***");
if (p_strict_checks) {
return false;
p_inner_ec_response := v_etsi_ts_102941_data.content.enrolmentResponse;
log("f_await_http_inner_ec_request_response: Well-secured EA certificate received ***");
log("p_inner_ec_response= ", p_inner_ec_response);
} else {
log("f_await_http_inner_ec_request_response: Invalid message received ***");
return false;
}
[] tc_ac.timeout {
log("f_await_http_inner_ec_request_response: Expected message not received ***");
}
} // End of 'alt' statement
} // End of function f_await_http_inner_ec_request_response
function f_await_ec_request_send_response(
out InnerEcResponse p_inner_ec_response
) runs on ItsPkiHttp return boolean {
var HttpMessage v_request;
var boolean v_result := false;
log(">>> f_await_ec_request_send_response");
tc_ac.start;
alt {
[] a_await_ec_http_request_from_iut(
mw_http_request(
mw_http_request_post(
PICS_HTTP_POST_URI_EC,
-,
mw_http_message_body_binary(
mw_binary_body_ieee1609dot2_data(
mw_enrolmentRequestMessage(
mw_encryptedData(
-,
mw_SymmetricCiphertext_aes128ccm
)))))),
v_request
) {
var Ieee1609Dot2Data v_ieee1609dot2_signed_and_encrypted_data;
var EtsiTs102941Data v_etsi_ts_102941_data;
var Oct16 v_request_hash;
var Oct16 v_aes_enc_key;
var InnerEcRequest v_inner_ec_request;
var template (value) HttpMessage v_response;
var HeaderLines v_headers;
tc_ac.stop;
f_init_default_headers_list(-, "inner_ec_response", v_headers);
if (f_verify_pki_request_message(vc_eaPrivateEncKey, vc_eaWholeHash/*salt*/, ''O, v_request.request.body.binary_body.ieee1609dot2_data, false, v_request_hash, v_etsi_ts_102941_data, v_aes_enc_key) == false) { // Cannot decrypt the message
log("f_await_ec_request_send_response: Failed to verify PKI message ***");
// Send error message
v_response := m_http_response(m_http_response_ko(m_http_message_body_binary(m_binary_body_ieee1609dot2_data(v_ieee1609dot2_signed_and_encrypted_data)), v_headers, 400, "Bad request")); // Initialize v_reponse with an error message
} else {
log("f_await_ec_request_send_response: Receive ", v_etsi_ts_102941_data, " ***");
if (f_verify_inner_ec_request_signed_for_pop(v_etsi_ts_102941_data, v_inner_ec_request) == false) {
log("f_await_ec_request_send_response: Failed to verify PKI message ***");
// Send error message