use of org.openecard.bouncycastle.asn1.ASN1Sequence in project keystore-explorer by kaikramer.
the class DViewCsr method extensionsPressed.
private void extensionsPressed() {
// extract sequence with extensions from csr
Attribute[] attributes = pkcs10Csr.getAttributes(pkcs_9_at_extensionRequest);
X509ExtensionSet x509ExtensionSet = new X509ExtensionSet();
if ((attributes != null) && (attributes.length > 0)) {
ASN1Encodable[] attributeValues = attributes[0].getAttributeValues();
if (attributeValues.length > 0) {
ASN1Sequence asn1Sequence = ASN1Sequence.getInstance(attributeValues[0]);
x509ExtensionSet = new X509ExtensionSet(asn1Sequence);
}
}
DViewExtensions dViewExtensions = new DViewExtensions(this, res.getString("DViewCertificate.Extensions.Title"), x509ExtensionSet);
dViewExtensions.setLocationRelativeTo(this);
dViewExtensions.setVisible(true);
}
use of org.openecard.bouncycastle.asn1.ASN1Sequence in project xipki by xipki.
the class XmlX509Certprofile method getExtensions.
@Override
public ExtensionValues getExtensions(Map<ASN1ObjectIdentifier, ExtensionControl> extensionOccurences, X500Name requestedSubject, X500Name grantedSubject, Extensions requestedExtensions, Date notBefore, Date notAfter, PublicCaInfo caInfo) throws CertprofileException, BadCertTemplateException {
ExtensionValues values = new ExtensionValues();
if (CollectionUtil.isEmpty(extensionOccurences)) {
return values;
}
ParamUtil.requireNonNull("requestedSubject", requestedSubject);
ParamUtil.requireNonNull("notBefore", notBefore);
ParamUtil.requireNonNull("notAfter", notAfter);
Set<ASN1ObjectIdentifier> occurences = new HashSet<>(extensionOccurences.keySet());
// AuthorityKeyIdentifier
// processed by the CA
// SubjectKeyIdentifier
// processed by the CA
// KeyUsage
// processed by the CA
// CertificatePolicies
ASN1ObjectIdentifier type = Extension.certificatePolicies;
if (certificatePolicies != null) {
if (occurences.remove(type)) {
values.addExtension(type, certificatePolicies);
}
}
// Policy Mappings
type = Extension.policyMappings;
if (policyMappings != null) {
if (occurences.remove(type)) {
values.addExtension(type, policyMappings);
}
}
// SubjectAltName
type = Extension.subjectAlternativeName;
if (occurences.contains(type)) {
GeneralNames genNames = createRequestedSubjectAltNames(requestedSubject, grantedSubject, requestedExtensions);
if (genNames != null) {
ExtensionValue value = new ExtensionValue(extensionControls.get(type).isCritical(), genNames);
values.addExtension(type, value);
occurences.remove(type);
}
}
// IssuerAltName
// processed by the CA
// Subject Directory Attributes
type = Extension.subjectDirectoryAttributes;
if (occurences.contains(type) && subjectDirAttrsControl != null) {
Extension extension = (requestedExtensions == null) ? null : requestedExtensions.getExtension(type);
if (extension == null) {
throw new BadCertTemplateException("no SubjectDirecotryAttributes extension is contained in the request");
}
ASN1GeneralizedTime dateOfBirth = null;
String placeOfBirth = null;
String gender = null;
List<String> countryOfCitizenshipList = new LinkedList<>();
List<String> countryOfResidenceList = new LinkedList<>();
Map<ASN1ObjectIdentifier, List<ASN1Encodable>> otherAttrs = new HashMap<>();
Vector<?> reqSubDirAttrs = SubjectDirectoryAttributes.getInstance(extension.getParsedValue()).getAttributes();
final int n = reqSubDirAttrs.size();
for (int i = 0; i < n; i++) {
Attribute attr = (Attribute) reqSubDirAttrs.get(i);
ASN1ObjectIdentifier attrType = attr.getAttrType();
ASN1Encodable attrVal = attr.getAttributeValues()[0];
if (ObjectIdentifiers.DN_DATE_OF_BIRTH.equals(attrType)) {
dateOfBirth = ASN1GeneralizedTime.getInstance(attrVal);
} else if (ObjectIdentifiers.DN_PLACE_OF_BIRTH.equals(attrType)) {
placeOfBirth = DirectoryString.getInstance(attrVal).getString();
} else if (ObjectIdentifiers.DN_GENDER.equals(attrType)) {
gender = DERPrintableString.getInstance(attrVal).getString();
} else if (ObjectIdentifiers.DN_COUNTRY_OF_CITIZENSHIP.equals(attrType)) {
String country = DERPrintableString.getInstance(attrVal).getString();
countryOfCitizenshipList.add(country);
} else if (ObjectIdentifiers.DN_COUNTRY_OF_RESIDENCE.equals(attrType)) {
String country = DERPrintableString.getInstance(attrVal).getString();
countryOfResidenceList.add(country);
} else {
List<ASN1Encodable> otherAttrVals = otherAttrs.get(attrType);
if (otherAttrVals == null) {
otherAttrVals = new LinkedList<>();
otherAttrs.put(attrType, otherAttrVals);
}
otherAttrVals.add(attrVal);
}
}
Vector<Attribute> attrs = new Vector<>();
for (ASN1ObjectIdentifier attrType : subjectDirAttrsControl.getTypes()) {
if (ObjectIdentifiers.DN_DATE_OF_BIRTH.equals(attrType)) {
if (dateOfBirth != null) {
String timeStirng = dateOfBirth.getTimeString();
if (!SubjectDnSpec.PATTERN_DATE_OF_BIRTH.matcher(timeStirng).matches()) {
throw new BadCertTemplateException("invalid dateOfBirth " + timeStirng);
}
attrs.add(new Attribute(attrType, new DERSet(dateOfBirth)));
continue;
}
} else if (ObjectIdentifiers.DN_PLACE_OF_BIRTH.equals(attrType)) {
if (placeOfBirth != null) {
ASN1Encodable attrVal = new DERUTF8String(placeOfBirth);
attrs.add(new Attribute(attrType, new DERSet(attrVal)));
continue;
}
} else if (ObjectIdentifiers.DN_GENDER.equals(attrType)) {
if (gender != null && !gender.isEmpty()) {
char ch = gender.charAt(0);
if (!(gender.length() == 1 && (ch == 'f' || ch == 'F' || ch == 'm' || ch == 'M'))) {
throw new BadCertTemplateException("invalid gender " + gender);
}
ASN1Encodable attrVal = new DERPrintableString(gender);
attrs.add(new Attribute(attrType, new DERSet(attrVal)));
continue;
}
} else if (ObjectIdentifiers.DN_COUNTRY_OF_CITIZENSHIP.equals(attrType)) {
if (!countryOfCitizenshipList.isEmpty()) {
for (String country : countryOfCitizenshipList) {
if (!SubjectDnSpec.isValidCountryAreaCode(country)) {
throw new BadCertTemplateException("invalid countryOfCitizenship code " + country);
}
ASN1Encodable attrVal = new DERPrintableString(country);
attrs.add(new Attribute(attrType, new DERSet(attrVal)));
}
continue;
}
} else if (ObjectIdentifiers.DN_COUNTRY_OF_RESIDENCE.equals(attrType)) {
if (!countryOfResidenceList.isEmpty()) {
for (String country : countryOfResidenceList) {
if (!SubjectDnSpec.isValidCountryAreaCode(country)) {
throw new BadCertTemplateException("invalid countryOfResidence code " + country);
}
ASN1Encodable attrVal = new DERPrintableString(country);
attrs.add(new Attribute(attrType, new DERSet(attrVal)));
}
continue;
}
} else if (otherAttrs.containsKey(attrType)) {
for (ASN1Encodable attrVal : otherAttrs.get(attrType)) {
attrs.add(new Attribute(attrType, new DERSet(attrVal)));
}
continue;
}
throw new BadCertTemplateException("could not process type " + attrType.getId() + " in extension SubjectDirectoryAttributes");
}
SubjectDirectoryAttributes subjDirAttrs = new SubjectDirectoryAttributes(attrs);
ExtensionValue extValue = new ExtensionValue(extensionControls.get(type).isCritical(), subjDirAttrs);
values.addExtension(type, extValue);
occurences.remove(type);
}
// Basic Constraints
// processed by the CA
// Name Constraints
type = Extension.nameConstraints;
if (nameConstraints != null) {
if (occurences.remove(type)) {
values.addExtension(type, nameConstraints);
}
}
// PolicyConstrains
type = Extension.policyConstraints;
if (policyConstraints != null) {
if (occurences.remove(type)) {
values.addExtension(type, policyConstraints);
}
}
// ExtendedKeyUsage
// processed by CA
// CRL Distribution Points
// processed by the CA
// Inhibit anyPolicy
type = Extension.inhibitAnyPolicy;
if (inhibitAnyPolicy != null) {
if (occurences.remove(type)) {
values.addExtension(type, inhibitAnyPolicy);
}
}
// Freshest CRL
// processed by the CA
// Authority Information Access
// processed by the CA
// Subject Information Access
// processed by the CA
// Admission
type = ObjectIdentifiers.id_extension_admission;
if (occurences.contains(type) && admission != null) {
if (admission.isInputFromRequestRequired()) {
Extension extension = (requestedExtensions == null) ? null : requestedExtensions.getExtension(type);
if (extension == null) {
throw new BadCertTemplateException("No Admission extension is contained in the request");
}
Admissions[] reqAdmissions = org.bouncycastle.asn1.isismtt.x509.AdmissionSyntax.getInstance(extension.getParsedValue()).getContentsOfAdmissions();
final int n = reqAdmissions.length;
List<List<String>> reqRegNumsList = new ArrayList<>(n);
for (int i = 0; i < n; i++) {
Admissions reqAdmission = reqAdmissions[i];
ProfessionInfo[] reqPis = reqAdmission.getProfessionInfos();
List<String> reqNums = new ArrayList<>(reqPis.length);
reqRegNumsList.add(reqNums);
for (ProfessionInfo reqPi : reqPis) {
String reqNum = reqPi.getRegistrationNumber();
reqNums.add(reqNum);
}
}
values.addExtension(type, admission.getExtensionValue(reqRegNumsList));
occurences.remove(type);
} else {
values.addExtension(type, admission.getExtensionValue(null));
occurences.remove(type);
}
}
// OCSP Nocheck
// processed by the CA
// restriction
type = ObjectIdentifiers.id_extension_restriction;
if (restriction != null) {
if (occurences.remove(type)) {
values.addExtension(type, restriction);
}
}
// AdditionalInformation
type = ObjectIdentifiers.id_extension_additionalInformation;
if (additionalInformation != null) {
if (occurences.remove(type)) {
values.addExtension(type, additionalInformation);
}
}
// ValidityModel
type = ObjectIdentifiers.id_extension_validityModel;
if (validityModel != null) {
if (occurences.remove(type)) {
values.addExtension(type, validityModel);
}
}
// PrivateKeyUsagePeriod
type = Extension.privateKeyUsagePeriod;
if (occurences.contains(type)) {
Date tmpNotAfter;
if (privateKeyUsagePeriod == null) {
tmpNotAfter = notAfter;
} else {
tmpNotAfter = privateKeyUsagePeriod.add(notBefore);
if (tmpNotAfter.after(notAfter)) {
tmpNotAfter = notAfter;
}
}
ASN1EncodableVector vec = new ASN1EncodableVector();
vec.add(new DERTaggedObject(false, 0, new DERGeneralizedTime(notBefore)));
vec.add(new DERTaggedObject(false, 1, new DERGeneralizedTime(tmpNotAfter)));
ExtensionValue extValue = new ExtensionValue(extensionControls.get(type).isCritical(), new DERSequence(vec));
values.addExtension(type, extValue);
occurences.remove(type);
}
// QCStatements
type = Extension.qCStatements;
if (occurences.contains(type) && (qcStatments != null || qcStatementsOption != null)) {
if (qcStatments != null) {
values.addExtension(type, qcStatments);
occurences.remove(type);
} else if (requestedExtensions != null && qcStatementsOption != null) {
// extract the euLimit data from request
Extension extension = requestedExtensions.getExtension(type);
if (extension == null) {
throw new BadCertTemplateException("No QCStatement extension is contained in the request");
}
ASN1Sequence seq = ASN1Sequence.getInstance(extension.getParsedValue());
Map<String, int[]> qcEuLimits = new HashMap<>();
final int n = seq.size();
for (int i = 0; i < n; i++) {
QCStatement stmt = QCStatement.getInstance(seq.getObjectAt(i));
if (!ObjectIdentifiers.id_etsi_qcs_QcLimitValue.equals(stmt.getStatementId())) {
continue;
}
MonetaryValue monetaryValue = MonetaryValue.getInstance(stmt.getStatementInfo());
int amount = monetaryValue.getAmount().intValue();
int exponent = monetaryValue.getExponent().intValue();
Iso4217CurrencyCode currency = monetaryValue.getCurrency();
String currencyS = currency.isAlphabetic() ? currency.getAlphabetic().toUpperCase() : Integer.toString(currency.getNumeric());
qcEuLimits.put(currencyS, new int[] { amount, exponent });
}
ASN1EncodableVector vec = new ASN1EncodableVector();
for (QcStatementOption m : qcStatementsOption) {
if (m.getStatement() != null) {
vec.add(m.getStatement());
continue;
}
MonetaryValueOption monetaryOption = m.getMonetaryValueOption();
String currencyS = monetaryOption.getCurrencyString();
int[] limit = qcEuLimits.get(currencyS);
if (limit == null) {
throw new BadCertTemplateException("no EuLimitValue is specified for currency '" + currencyS + "'");
}
int amount = limit[0];
Range2Type range = monetaryOption.getAmountRange();
if (amount < range.getMin() || amount > range.getMax()) {
throw new BadCertTemplateException("amount for currency '" + currencyS + "' is not within [" + range.getMin() + ", " + range.getMax() + "]");
}
int exponent = limit[1];
range = monetaryOption.getExponentRange();
if (exponent < range.getMin() || exponent > range.getMax()) {
throw new BadCertTemplateException("exponent for currency '" + currencyS + "' is not within [" + range.getMin() + ", " + range.getMax() + "]");
}
MonetaryValue monetaryVale = new MonetaryValue(monetaryOption.getCurrency(), amount, exponent);
QCStatement qcStatment = new QCStatement(m.getStatementId(), monetaryVale);
vec.add(qcStatment);
}
ExtensionValue extValue = new ExtensionValue(extensionControls.get(type).isCritical(), new DERSequence(vec));
values.addExtension(type, extValue);
occurences.remove(type);
} else {
throw new RuntimeException("should not reach here");
}
}
// BiometricData
type = Extension.biometricInfo;
if (occurences.contains(type) && biometricInfo != null) {
Extension extension = (requestedExtensions == null) ? null : requestedExtensions.getExtension(type);
if (extension == null) {
throw new BadCertTemplateException("no biometricInfo extension is contained in the request");
}
ASN1Sequence seq = ASN1Sequence.getInstance(extension.getParsedValue());
final int n = seq.size();
if (n < 1) {
throw new BadCertTemplateException("biometricInfo extension in request contains empty sequence");
}
ASN1EncodableVector vec = new ASN1EncodableVector();
for (int i = 0; i < n; i++) {
BiometricData bd = BiometricData.getInstance(seq.getObjectAt(i));
TypeOfBiometricData bdType = bd.getTypeOfBiometricData();
if (!biometricInfo.isTypePermitted(bdType)) {
throw new BadCertTemplateException("biometricInfo[" + i + "].typeOfBiometricData is not permitted");
}
ASN1ObjectIdentifier hashAlgo = bd.getHashAlgorithm().getAlgorithm();
if (!biometricInfo.isHashAlgorithmPermitted(hashAlgo)) {
throw new BadCertTemplateException("biometricInfo[" + i + "].hashAlgorithm is not permitted");
}
int expHashValueSize;
try {
expHashValueSize = AlgorithmUtil.getHashOutputSizeInOctets(hashAlgo);
} catch (NoSuchAlgorithmException ex) {
throw new CertprofileException("should not happen, unknown hash algorithm " + hashAlgo);
}
byte[] hashValue = bd.getBiometricDataHash().getOctets();
if (hashValue.length != expHashValueSize) {
throw new BadCertTemplateException("biometricInfo[" + i + "].biometricDataHash has incorrect length");
}
DERIA5String sourceDataUri = bd.getSourceDataUri();
switch(biometricInfo.getSourceDataUriOccurrence()) {
case FORBIDDEN:
sourceDataUri = null;
break;
case REQUIRED:
if (sourceDataUri == null) {
throw new BadCertTemplateException("biometricInfo[" + i + "].sourceDataUri is not specified in request but is required");
}
break;
case OPTIONAL:
break;
default:
throw new BadCertTemplateException("could not reach here, unknown tripleState");
}
AlgorithmIdentifier newHashAlg = new AlgorithmIdentifier(hashAlgo, DERNull.INSTANCE);
BiometricData newBiometricData = new BiometricData(bdType, newHashAlg, new DEROctetString(hashValue), sourceDataUri);
vec.add(newBiometricData);
}
ExtensionValue extValue = new ExtensionValue(extensionControls.get(type).isCritical(), new DERSequence(vec));
values.addExtension(type, extValue);
occurences.remove(type);
}
// TlsFeature
type = ObjectIdentifiers.id_pe_tlsfeature;
if (tlsFeature != null) {
if (occurences.remove(type)) {
values.addExtension(type, tlsFeature);
}
}
// AuthorizationTemplate
type = ObjectIdentifiers.id_xipki_ext_authorizationTemplate;
if (authorizationTemplate != null) {
if (occurences.remove(type)) {
values.addExtension(type, authorizationTemplate);
}
}
// SMIME
type = ObjectIdentifiers.id_smimeCapabilities;
if (smimeCapabilities != null) {
if (occurences.remove(type)) {
values.addExtension(type, smimeCapabilities);
}
}
// constant extensions
if (constantExtensions != null) {
for (ASN1ObjectIdentifier m : constantExtensions.keySet()) {
if (!occurences.remove(m)) {
continue;
}
ExtensionValue extensionValue = constantExtensions.get(m);
if (extensionValue != null) {
values.addExtension(m, extensionValue);
}
}
}
ExtensionValues extraExtensions = getExtraExtensions(extensionOccurences, requestedSubject, grantedSubject, requestedExtensions, notBefore, notAfter, caInfo);
if (extraExtensions != null) {
for (ASN1ObjectIdentifier m : extraExtensions.getExtensionTypes()) {
values.addExtension(m, extraExtensions.getExtensionValue(m));
}
}
return values;
}
use of org.openecard.bouncycastle.asn1.ASN1Sequence in project xipki by xipki.
the class XmlX509Certprofile method initQcStatements.
private void initQcStatements(Set<ASN1ObjectIdentifier> extnIds, ExtensionsType extensionsType) throws CertprofileException {
ASN1ObjectIdentifier type = Extension.qCStatements;
if (!extensionControls.containsKey(type)) {
return;
}
extnIds.remove(type);
QcStatements extConf = (QcStatements) getExtensionValue(type, extensionsType, QcStatements.class);
if (extConf == null) {
return;
}
List<QcStatementType> qcStatementTypes = extConf.getQcStatement();
this.qcStatementsOption = new ArrayList<>(qcStatementTypes.size());
Set<String> currencyCodes = new HashSet<>();
boolean requireInfoFromReq = false;
for (QcStatementType m : qcStatementTypes) {
ASN1ObjectIdentifier qcStatementId = new ASN1ObjectIdentifier(m.getStatementId().getValue());
QcStatementOption qcStatementOption;
QcStatementValueType statementValue = m.getStatementValue();
if (statementValue == null) {
QCStatement qcStatment = new QCStatement(qcStatementId);
qcStatementOption = new QcStatementOption(qcStatment);
} else if (statementValue.getQcRetentionPeriod() != null) {
QCStatement qcStatment = new QCStatement(qcStatementId, new ASN1Integer(statementValue.getQcRetentionPeriod()));
qcStatementOption = new QcStatementOption(qcStatment);
} else if (statementValue.getConstant() != null) {
ASN1Encodable constantStatementValue;
try {
constantStatementValue = new ASN1StreamParser(statementValue.getConstant().getValue()).readObject();
} catch (IOException ex) {
throw new CertprofileException("can not parse the constant value of QcStatement");
}
QCStatement qcStatment = new QCStatement(qcStatementId, constantStatementValue);
qcStatementOption = new QcStatementOption(qcStatment);
} else if (statementValue.getQcEuLimitValue() != null) {
QcEuLimitValueType euLimitType = statementValue.getQcEuLimitValue();
String tmpCurrency = euLimitType.getCurrency().toUpperCase();
if (currencyCodes.contains(tmpCurrency)) {
throw new CertprofileException("Duplicated definition of qcStatments with QCEuLimitValue" + " for the currency " + tmpCurrency);
}
Iso4217CurrencyCode currency = StringUtil.isNumber(tmpCurrency) ? new Iso4217CurrencyCode(Integer.parseInt(tmpCurrency)) : new Iso4217CurrencyCode(tmpCurrency);
Range2Type r1 = euLimitType.getAmount();
Range2Type r2 = euLimitType.getExponent();
if (r1.getMin() == r1.getMax() && r2.getMin() == r2.getMax()) {
MonetaryValue monetaryValue = new MonetaryValue(currency, r1.getMin(), r2.getMin());
QCStatement qcStatement = new QCStatement(qcStatementId, monetaryValue);
qcStatementOption = new QcStatementOption(qcStatement);
} else {
MonetaryValueOption monetaryValueOption = new MonetaryValueOption(currency, r1, r2);
qcStatementOption = new QcStatementOption(qcStatementId, monetaryValueOption);
requireInfoFromReq = true;
}
currencyCodes.add(tmpCurrency);
} else if (statementValue.getPdsLocations() != null) {
ASN1EncodableVector vec = new ASN1EncodableVector();
for (PdsLocationType pl : statementValue.getPdsLocations().getPdsLocation()) {
ASN1EncodableVector vec2 = new ASN1EncodableVector();
vec2.add(new DERIA5String(pl.getUrl()));
String lang = pl.getLanguage();
if (lang.length() != 2) {
throw new RuntimeException("invalid language '" + lang + "'");
}
vec2.add(new DERPrintableString(lang));
DERSequence seq = new DERSequence(vec2);
vec.add(seq);
}
QCStatement qcStatement = new QCStatement(qcStatementId, new DERSequence(vec));
qcStatementOption = new QcStatementOption(qcStatement);
} else {
throw new RuntimeException("unknown value of qcStatment");
}
this.qcStatementsOption.add(qcStatementOption);
}
if (requireInfoFromReq) {
return;
}
ASN1EncodableVector vec = new ASN1EncodableVector();
for (QcStatementOption m : qcStatementsOption) {
if (m.getStatement() == null) {
throw new RuntimeException("should not reach here");
}
vec.add(m.getStatement());
}
ASN1Sequence seq = new DERSequence(vec);
qcStatments = new ExtensionValue(extensionControls.get(type).isCritical(), seq);
qcStatementsOption = null;
}
use of org.openecard.bouncycastle.asn1.ASN1Sequence in project xipki by xipki.
the class XmlX509Certprofile method initPolicyConstraints.
private void initPolicyConstraints(Set<ASN1ObjectIdentifier> extnIds, ExtensionsType extensionsType) throws CertprofileException {
ASN1ObjectIdentifier type = Extension.policyConstraints;
if (!extensionControls.containsKey(type)) {
return;
}
extnIds.remove(type);
PolicyConstraints extConf = (PolicyConstraints) getExtensionValue(type, extensionsType, PolicyConstraints.class);
if (extConf == null) {
return;
}
ASN1Sequence value = XmlX509CertprofileUtil.buildPolicyConstrains(extConf);
this.policyConstraints = new ExtensionValue(extensionControls.get(type).isCritical(), value);
}
use of org.openecard.bouncycastle.asn1.ASN1Sequence in project xipki by xipki.
the class CmpRequestor method extractXiActionContent.
protected ASN1Encodable extractXiActionContent(ASN1Encodable itvValue, int action) throws CmpRequestorException {
ParamUtil.requireNonNull("itvValue", itvValue);
ASN1Sequence seq;
try {
seq = ASN1Sequence.getInstance(itvValue);
} catch (IllegalArgumentException ex) {
throw new CmpRequestorException("invalid syntax of the response");
}
int size = seq.size();
if (size != 1 && size != 2) {
throw new CmpRequestorException("invalid syntax of the response");
}
int tmpAction;
try {
tmpAction = ASN1Integer.getInstance(seq.getObjectAt(0)).getPositiveValue().intValue();
} catch (IllegalArgumentException ex) {
throw new CmpRequestorException("invalid syntax of the response");
}
if (action != tmpAction) {
throw new CmpRequestorException("received XiPKI action '" + tmpAction + "' instead the expected '" + action + "'");
}
return (size == 1) ? null : seq.getObjectAt(1);
}
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