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The Apache WSS4J project provides a Java implementation of the primary security standards
for Web Services, namely the OASIS Web Services Security (WS-Security) specifications
from the OASIS Web Services Security TC.
/*
* Copyright 2003-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.ws.security.message;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ws.security.SOAPConstants;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSEncryptionPart;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.components.crypto.Crypto;
import org.apache.ws.security.message.token.Reference;
import org.apache.ws.security.message.token.SecurityTokenReference;
import org.apache.ws.security.util.Base64;
import org.apache.ws.security.util.WSSecurityUtil;
import org.apache.xml.security.algorithms.JCEMapper;
import org.apache.xml.security.encryption.EncryptedData;
import org.apache.xml.security.encryption.XMLCipher;
import org.apache.xml.security.encryption.XMLEncryptionException;
import org.apache.xml.security.keys.KeyInfo;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.Vector;
/**
* Encrypts a parts of a message according to WS Specification, X509 profile,
* and adds the encryption data.
*
* @author Davanum Srinivas ([email protected]).
* @author Werner Dittmann ([email protected]).
*/
public class WSSecEncrypt extends WSSecEncryptedKey {
private static Log log = LogFactory.getLog(WSSecEncrypt.class.getName());
protected String symEncAlgo = WSConstants.AES_128;
protected String encCanonAlgo = null;
protected byte[] embeddedKey = null;
protected String embeddedKeyName = null;
protected boolean useKeyIdentifier;
/**
* Symmetric key used in the EncrytpedKey.
*/
protected SecretKey symmetricKey = null;
/**
* SecurityTokenReference to be inserted into EncryptedData/keyInfo element.
*/
protected SecurityTokenReference securityTokenReference = null;
/**
* Indicates whether to encrypt the symmetric key into an EncryptedKey
* or not.
*/
private boolean encryptSymmKey = true;
/**
* Custom reference value
*/
private String customReferenceValue;
/**
* ValueType for the encrypted key reference
*/
private String encKeyValueType;
/**
* True if the encKeyId is a direct reference to a key identifier instead of a URI to a key
*/
private boolean encKeyIdDirectId;
/**
* Constructor.
*/
public WSSecEncrypt() {
}
/**
* Sets the key to use during embedded encryption.
*
* @param key to use during encryption. The key must fit the selected
* symmetrical encryption algorithm
*/
public void setKey(byte[] key) {
this.embeddedKey = key;
}
/**
* Sets the algorithm to encode the symmetric key.
*
* Default is the WSConstants.KEYTRANSPORT_RSA15 algorithm.
*
* @param keyEnc specifies the key encoding algorithm.
* @see WSConstants#KEYTRANSPORT_RSA15
* @see WSConstants#KEYTRANSPORT_RSAOEP
*/
public void setKeyEnc(String keyEnc) {
keyEncAlgo = keyEnc;
}
/**
* Set the key name for EMBEDDED_KEYNAME
*
* @param embeddedKeyName
*/
public void setEmbeddedKeyName(String embeddedKeyName) {
this.embeddedKeyName = embeddedKeyName;
}
/**
* Set this true if a key identifier must be used in the KeyInfo
*
* @param useKeyIdentifier
*/
public void setUseKeyIdentifier(boolean useKeyIdentifier) {
this.useKeyIdentifier = useKeyIdentifier;
}
/**
* Set the name of the symmetric encryption algorithm to use.
*
* This encryption algorithm is used to encrypt the data. If the algorithm
* is not set then AES128 is used. Refer to WSConstants which algorithms are
* supported.
*
* @param algo Is the name of the encryption algorithm
* @see WSConstants#TRIPLE_DES
* @see WSConstants#AES_128
* @see WSConstants#AES_192
* @see WSConstants#AES_256
*/
public void setSymmetricEncAlgorithm(String algo) {
symEncAlgo = algo;
}
/**
* Set the name of an optional canonicalization algorithm to use before
* encryption.
*
* This c14n algorithm is used to serialize the data before encryption. If
* the algorithm is not set then a standard serialization is used (provided
* by XMLCipher, usually a XMLSerializer according to DOM 3 specification).
*
* @param algo Is the name of the canonicalization algorithm
*/
public void setEncCanonicalization(String algo) {
encCanonAlgo = algo;
}
/**
* Get the name of symmetric encryption algorithm to use.
*
* The name of the encryption algorithm to encrypt the data, i.e. the SOAP
* Body. Refer to WSConstants which algorithms are supported.
*
* @return the name of the currently selected symmetric encryption algorithm
* @see WSConstants#TRIPLE_DES
* @see WSConstants#AES_128
* @see WSConstants#AES_192
* @see WSConstants#AES_256
*/
public String getSymmetricEncAlgorithm() {
return symEncAlgo;
}
/**
* Returns if Key Identifiers should be used in KeyInfo
* @return if Key Identifiers should be used in KeyInfo
*/
public boolean getUseKeyIdentifier() {
return useKeyIdentifier;
}
/**
* Initialize a WSSec Encrypt.
*
* The method prepares and initializes a WSSec Encrypt structure after the
* relevant information was set. After preparation of the token references
* can be added and encrypted.
*
* This method does not add any element to the security header. This must be
* done explicitly.
*
* @param doc The SOAP envelope as Document
* @param crypto An instance of the Crypto API to handle keystore and certificates
* @throws WSSecurityException
*/
public void prepare(Document doc, Crypto crypto) throws WSSecurityException {
document = doc;
//
// If no external key (symmetricalKey) was set generate an encryption
// key (session key) for this Encrypt element. This key will be
// encrypted using the public key of the receiver
//
if (this.ephemeralKey == null) {
if (symmetricKey == null) {
KeyGenerator keyGen = getKeyGenerator();
this.symmetricKey = keyGen.generateKey();
}
this.ephemeralKey = this.symmetricKey.getEncoded();
}
if (this.symmetricKey == null) {
this.symmetricKey = WSSecurityUtil.prepareSecretKey(symEncAlgo, this.ephemeralKey);
}
//
// Get the certificate that contains the public key for the public key
// algorithm that will encrypt the generated symmetric (session) key.
//
if (this.encryptSymmKey) {
X509Certificate remoteCert = null;
if (useThisCert != null) {
remoteCert = useThisCert;
} else {
X509Certificate[] certs = crypto.getCertificates(user);
if (certs == null || certs.length <= 0) {
throw new WSSecurityException(
WSSecurityException.FAILURE,
"noUserCertsFound",
new Object[] { user, "encryption" }
);
}
remoteCert = certs[0];
}
prepareInternal(this.ephemeralKey, remoteCert, crypto);
} else {
encryptedEphemeralKey = ephemeralKey;
}
}
/**
* Builds the SOAP envelope with encrypted Body and adds encrypted key.
*
* This is a convenience method and for backward compatibility. The method
* calls the single function methods in order to perform a one shot
* encryption. This method is compatible with the build method of the
* previous version with the exception of the additional WSSecHeader
* parameter.
*
* @param doc the SOAP envelope as Document with plain text Body
* @param crypto an instance of the Crypto API to handle keystore and Certificates
* @param secHeader the security header element to hold the encrypted key element.
* @return the SOAP envelope with encrypted Body as Document
* @throws WSSecurityException
*/
public Document build(Document doc, Crypto crypto, WSSecHeader secHeader)
throws WSSecurityException {
doDebug = log.isDebugEnabled();
if (keyIdentifierType == WSConstants.EMBEDDED_KEYNAME
|| keyIdentifierType == WSConstants.EMBED_SECURITY_TOKEN_REF) {
return buildEmbedded(doc, secHeader);
}
if (doDebug) {
log.debug("Beginning Encryption...");
}
prepare(doc, crypto);
if (envelope == null) {
envelope = document.getDocumentElement();
}
if (parts == null) {
parts = new Vector();
SOAPConstants soapConstants = WSSecurityUtil.getSOAPConstants(envelope);
WSEncryptionPart encP =
new WSEncryptionPart(
soapConstants.getBodyQName().getLocalPart(),
soapConstants.getEnvelopeURI(),
"Content"
);
parts.add(encP);
}
Element refs = encryptForInternalRef(null, parts);
if (encryptedKeyElement != null) {
addInternalRefElement(refs);
prependToHeader(secHeader);
} else {
WSSecurityUtil.prependChildElement(secHeader.getSecurityHeader(), refs);
}
if (bstToken != null) {
prependBSTElementToHeader(secHeader);
}
log.debug("Encryption complete.");
return doc;
}
/**
* Encrypt one or more parts or elements of the message (internal).
*
* This method takes a vector of WSEncryptionPart object that
* contain information about the elements to encrypt. The method call the
* encryption method, takes the reference information generated during
* encryption and add this to the xenc:Reference element.
* This method can be called after prepare() and can be
* called multiple times to encrypt a number of parts or elements.
*
* The method generates a xenc:Reference element that must
* be added to this token. See addInternalRefElement().
*
* If the dataRef parameter is null the method
* creates and initializes a new Reference element.
*
* @param dataRef A xenc:Reference element or null
* @param references A vector containing WSEncryptionPart objects
* @return Returns the updated xenc:Reference element
* @throws WSSecurityException
*/
public Element encryptForInternalRef(Element dataRef, Vector references)
throws WSSecurityException {
Vector encDataRefs =
doEncryption(document, this.symmetricKey, references);
Element referenceList = dataRef;
if (referenceList == null) {
referenceList =
document.createElementNS(
WSConstants.ENC_NS,
WSConstants.ENC_PREFIX + ":ReferenceList"
);
}
createDataRefList(document, referenceList, encDataRefs);
return referenceList;
}
/**
* Encrypt one or more parts or elements of the message (external).
*
* This method takes a vector of WSEncryptionPart object that
* contain information about the elements to encrypt. The method call the
* encryption method, takes the reference information generated during
* encryption and add this to the xenc:Reference element.
* This method can be called after prepare() and can be
* called multiple times to encrypt a number of parts or elements.
*
* The method generates a xenc:Reference element that must
* be added to the SecurityHeader. See addExternalRefElement().
*
* If the dataRef parameter is null the method
* creates and initializes a new Reference element.
*
* @param dataRef A xenc:Reference element or null
* @param references A vector containing WSEncryptionPart objects
* @return Returns the updated xenc:Reference element
* @throws WSSecurityException
*/
public Element encryptForExternalRef(Element dataRef, Vector references)
throws WSSecurityException {
Vector encDataRefs =
doEncryption(document, this.symmetricKey, references);
Element referenceList = dataRef;
if (referenceList == null) {
referenceList =
document.createElementNS(
WSConstants.ENC_NS,
WSConstants.ENC_PREFIX + ":ReferenceList"
);
//
// If we're not placing the ReferenceList in an EncryptedKey structure,
// then add the ENC namespace
//
if (!encryptSymmKey) {
WSSecurityUtil.setNamespace(
referenceList, WSConstants.ENC_NS, WSConstants.ENC_PREFIX
);
}
}
createDataRefList(document, referenceList, encDataRefs);
return referenceList;
}
/**
* Adds the internal Reference element to this Encrypt data.
*
* The reference element must be created by the
* encryptForInternalRef() method. The reference element is
* added to the EncryptedKey element of this encrypt block.
*
* @param dataRef The internal enc:Reference element
*/
public void addInternalRefElement(Element dataRef) {
encryptedKeyElement.appendChild(dataRef);
}
/**
* Adds (prepends) the external Reference element to the Security header.
*
* The reference element must be created by the
* encryptForExternalRef() method. The method prepends the
* reference element in the SecurityHeader.
*
* @param dataRef The external enc:Reference element
* @param secHeader The security header.
*/
public void addExternalRefElement(Element dataRef, WSSecHeader secHeader) {
WSSecurityUtil.prependChildElement(secHeader.getSecurityHeader(), dataRef);
}
private Vector doEncryption(Document doc, SecretKey secretKey, Vector references)
throws WSSecurityException {
KeyInfo keyInfo = null;
// Prepare KeyInfo if useKeyIdentifier is set
if (useKeyIdentifier &&
keyIdentifierType == WSConstants.ENCRYPTED_KEY_SHA1_IDENTIFIER) {
keyInfo = new KeyInfo(document);
SecurityTokenReference secToken = new SecurityTokenReference(document);
if (this.customReferenceValue != null) {
secToken.setKeyIdentifierEncKeySHA1(this.customReferenceValue);
} else {
secToken.setKeyIdentifierEncKeySHA1(getSHA1(encryptedEphemeralKey));
}
keyInfo.addUnknownElement(secToken.getElement());
Element keyInfoElement = keyInfo.getElement();
keyInfoElement.setAttributeNS(
WSConstants.XMLNS_NS, "xmlns:"+ WSConstants.SIG_PREFIX, WSConstants.SIG_NS
);
}
return doEncryption(doc, secretKey, keyInfo, references);
}
private Vector doEncryption(
Document doc,
SecretKey secretKey,
KeyInfo keyInfo,
Vector references
) throws WSSecurityException {
XMLCipher xmlCipher = null;
try {
xmlCipher = XMLCipher.getInstance(symEncAlgo);
} catch (XMLEncryptionException e3) {
throw new WSSecurityException(
WSSecurityException.UNSUPPORTED_ALGORITHM, null, null, e3
);
}
Vector encDataRef = new Vector();
boolean cloneKeyInfo = false;
for (int part = 0; part < references.size(); part++) {
WSEncryptionPart encPart = (WSEncryptionPart) references.get(part);
String idToEnc = encPart.getId();
String elemName = encPart.getName();
String nmSpace = encPart.getNamespace();
String modifier = encPart.getEncModifier();
//
// Third step: get the data to encrypt.
//
Element body = null;
if (idToEnc != null) {
body =
WSSecurityUtil.findElementById(
document.getDocumentElement(), idToEnc, WSConstants.WSU_NS
);
if (body == null) {
body =
WSSecurityUtil.findElementById(document.getDocumentElement(), idToEnc, null);
}
} else {
body = (Element) WSSecurityUtil.findElement(document, elemName, nmSpace);
}
if (body == null) {
throw new WSSecurityException(
WSSecurityException.FAILURE,
"noEncElement",
new Object[] {"{" + nmSpace + "}" + elemName}
);
}
boolean content = modifier.equals("Content") ? true : false;
String xencEncryptedDataId = wssConfig.getIdAllocator().createId("EncDataId-", body);
encPart.setEncId(xencEncryptedDataId);
cloneKeyInfo = true;
if (keyInfo == null) {
keyInfo = new KeyInfo(document);
SecurityTokenReference secToken = new SecurityTokenReference(document);
Reference ref = new Reference(document);
if (encKeyIdDirectId) {
ref.setURI(encKeyId);
} else {
ref.setURI("#" + encKeyId);
}
if (encKeyValueType != null) {
ref.setValueType(encKeyValueType);
}
secToken.setReference(ref);
keyInfo.addUnknownElement(secToken.getElement());
Element keyInfoElement = keyInfo.getElement();
keyInfoElement.setAttributeNS(
WSConstants.XMLNS_NS, "xmlns:" + WSConstants.SIG_PREFIX, WSConstants.SIG_NS
);
}
//
// Fourth step: encrypt data, and set necessary attributes in
// xenc:EncryptedData
//
try {
if (modifier.equals("Header")) {
Element elem =
doc.createElementNS(
WSConstants.WSSE11_NS, "wsse11:" + WSConstants.ENCRYPTED_HEADER
);
WSSecurityUtil.setNamespace(elem, WSConstants.WSSE11_NS, WSConstants.WSSE11_PREFIX);
String wsuPrefix =
WSSecurityUtil.setNamespace(elem, WSConstants.WSU_NS, WSConstants.WSU_PREFIX);
elem.setAttributeNS(
WSConstants.WSU_NS, wsuPrefix + ":Id",
wssConfig.getIdAllocator().createId("EncHeader-", body)
);
NamedNodeMap map = body.getAttributes();
for (int i = 0 ; i < map.getLength() ; i++) {
Attr attr = (Attr)map.item(i);
if (attr.getNamespaceURI().equals(WSConstants.URI_SOAP11_ENV)
|| attr.getNamespaceURI().equals(WSConstants.URI_SOAP12_ENV)) {
String soapEnvPrefix =
WSSecurityUtil.setNamespace(
elem, attr.getNamespaceURI(), WSConstants.DEFAULT_SOAP_PREFIX
);
elem.setAttributeNS(
attr.getNamespaceURI(),
soapEnvPrefix + ":" + attr.getLocalName(),
attr.getValue()
);
}
}
xmlCipher.init(XMLCipher.ENCRYPT_MODE, secretKey);
EncryptedData encData = xmlCipher.getEncryptedData();
encData.setId(xencEncryptedDataId);
encData.setKeyInfo(keyInfo);
xmlCipher.doFinal(doc, body, content);
Element encDataElem =
WSSecurityUtil.findElementById(
document.getDocumentElement(), xencEncryptedDataId, null
);
Node clone = encDataElem.cloneNode(true);
elem.appendChild(clone);
encDataElem.getParentNode().appendChild(elem);
encDataElem.getParentNode().removeChild(encDataElem);
} else {
xmlCipher.init(XMLCipher.ENCRYPT_MODE, secretKey);
EncryptedData encData = xmlCipher.getEncryptedData();
encData.setId(xencEncryptedDataId);
encData.setKeyInfo(keyInfo);
xmlCipher.doFinal(doc, body, content);
}
if (cloneKeyInfo) {
keyInfo = new KeyInfo((Element) keyInfo.getElement().cloneNode(true), null);
}
} catch (Exception e2) {
throw new WSSecurityException(
WSSecurityException.FAILED_ENCRYPTION, null, null, e2
);
}
encDataRef.add("#" + xencEncryptedDataId);
}
return encDataRef;
}
private Document buildEmbedded(Document doc, WSSecHeader secHeader)
throws WSSecurityException {
doDebug = log.isDebugEnabled();
if (doDebug) {
log.debug("Beginning Encryption embedded...");
}
envelope = doc.getDocumentElement();
envelope.setAttributeNS(
WSConstants.XMLNS_NS, "xmlns:" + WSConstants.ENC_PREFIX, WSConstants.ENC_NS
);
//
// Second step: generate a symmetric key from the specified key
// (password) for this algorithm, and set the cipher into encryption
// mode.
//
if (this.symmetricKey == null) {
if (embeddedKey == null) {
throw new WSSecurityException(WSSecurityException.FAILURE, "noKeySupplied");
}
this.symmetricKey = WSSecurityUtil.prepareSecretKey(symEncAlgo, embeddedKey);
}
KeyInfo keyInfo = null;
if (this.keyIdentifierType == WSConstants.EMBEDDED_KEYNAME) {
keyInfo = new KeyInfo(doc);
keyInfo.addKeyName(embeddedKeyName == null ? user : embeddedKeyName);
} else if (this.keyIdentifierType == WSConstants.EMBED_SECURITY_TOKEN_REF) {
//
// This means that we want to embed a
// into keyInfo element. If we need this functionality, this.secRef
// MUST be set before calling the build(doc, crypto) method. So if
// secRef is null then throw an exception.
//
if (this.securityTokenReference == null) {
throw new WSSecurityException(
WSSecurityException.SECURITY_TOKEN_UNAVAILABLE,
"You must set keyInfo element, if the keyIdentifier == EMBED_SECURITY_TOKEN_REF"
);
} else {
keyInfo = new KeyInfo(doc);
Element tmpE = securityTokenReference.getElement();
tmpE.setAttributeNS(
WSConstants.XMLNS_NS, "xmlns:" + tmpE.getPrefix(), tmpE.getNamespaceURI()
);
keyInfo.addUnknownElement(securityTokenReference.getElement());
}
}
Element keyInfoElement = keyInfo.getElement();
keyInfoElement.setAttributeNS(
WSConstants.XMLNS_NS, "xmlns:" + WSConstants.SIG_PREFIX, WSConstants.SIG_NS
);
SOAPConstants soapConstants = WSSecurityUtil.getSOAPConstants(envelope);
if (parts == null) {
parts = new Vector();
WSEncryptionPart encP =
new WSEncryptionPart(
soapConstants.getBodyQName().getLocalPart(),
soapConstants.getEnvelopeURI(),
"Content"
);
parts.add(encP);
}
Vector encDataRefs = doEncryption(doc, this.symmetricKey, keyInfo, parts);
//
// At this point data is encrypted with the symmetric key and can be
// referenced via the above Id
//
//
// Now we need to setup the wsse:Security header block 1) get (or
// create) the wsse:Security header block 2) The last step sets up the
// reference list that pints to the encrypted data
//
Element wsseSecurity = secHeader.getSecurityHeader();
Element referenceList =
doc.createElementNS(WSConstants.ENC_NS, WSConstants.ENC_PREFIX + ":ReferenceList");
referenceList = createDataRefList(doc, referenceList, encDataRefs);
WSSecurityUtil.prependChildElement(wsseSecurity, referenceList);
return doc;
}
private KeyGenerator getKeyGenerator() throws WSSecurityException {
try {
//
// Assume AES as default, so initialize it
//
String keyAlgorithm = JCEMapper.getJCEKeyAlgorithmFromURI(symEncAlgo);
KeyGenerator keyGen = KeyGenerator.getInstance(keyAlgorithm);
if (symEncAlgo.equalsIgnoreCase(WSConstants.AES_128)) {
keyGen.init(128);
} else if (symEncAlgo.equalsIgnoreCase(WSConstants.AES_192)) {
keyGen.init(192);
} else if (symEncAlgo.equalsIgnoreCase(WSConstants.AES_256)) {
keyGen.init(256);
}
return keyGen;
} catch (NoSuchAlgorithmException e) {
throw new WSSecurityException(
WSSecurityException.UNSUPPORTED_ALGORITHM, null, null, e
);
}
}
/**
* Create DOM subtree for xenc:EncryptedKey
*
* @param doc the SOAP envelope parent document
* @param referenceList
* @param encDataRefs
* @return an xenc:EncryptedKey element
*/
public static Element createDataRefList(
Document doc,
Element referenceList,
Vector encDataRefs
) {
for (int i = 0; i < encDataRefs.size(); i++) {
String dataReferenceUri = (String) encDataRefs.get(i);
Element dataReference =
doc.createElementNS(
WSConstants.ENC_NS, WSConstants.ENC_PREFIX + ":DataReference"
);
dataReference.setAttributeNS(null, "URI", dataReferenceUri);
referenceList.appendChild(dataReference);
}
return referenceList;
}
/**
* @return The symmetric key
*/
public SecretKey getSymmetricKey() {
return symmetricKey;
}
/**
* Set the symmetric key to be used for encryption
*
* @param key
*/
public void setSymmetricKey(SecretKey key) {
this.symmetricKey = key;
}
/**
* @return Return the SecurityTokenRefernce
*/
public SecurityTokenReference getSecurityTokenReference() {
return securityTokenReference;
}
/**
* @param reference
*/
public void setSecurityTokenReference(SecurityTokenReference reference) {
securityTokenReference = reference;
}
public boolean isEncryptSymmKey() {
return encryptSymmKey;
}
public void setEncryptSymmKey(boolean encryptSymmKey) {
this.encryptSymmKey = encryptSymmKey;
}
private String getSHA1(byte[] input) throws WSSecurityException {
try {
MessageDigest sha = null;
sha = MessageDigest.getInstance("SHA-1");
sha.reset();
sha.update(input);
byte[] data = sha.digest();
return Base64.encode(data);
} catch (NoSuchAlgorithmException e) {
throw new WSSecurityException(
WSSecurityException.UNSUPPORTED_ALGORITHM, null, null, e
);
}
}
public void setCustomReferenceValue(String customReferenceValue) {
this.customReferenceValue = customReferenceValue;
}
public void setEncKeyValueType(String e) {
encKeyValueType = e;
}
public void setEncKeyIdDirectId(boolean b) {
encKeyIdDirectId = b;
}
}