js/ContentObject.js - ndn-js - Gitiles

 /**
  * @author: Meki Cheraoui
  * See COPYING for copyright and distribution information.
  * This class represents ContentObject Objects
  */
 var ContentObject = function ContentObject(_name,_signedInfo,_content,_signature){


 	if (typeof _name == 'string') {
 		this.name = new Name(_name);
 	}
 	else{
 		//TODO Check the class of _name
 		this.name = _name;
 	}
 	this.signedInfo = _signedInfo;

 	if (typeof _content == 'string') {
 		this.content = DataUtils.toNumbersFromString(_content);
 	} else {
 		this.content = _content;
 	}

 	this.signature = _signature;


 	this.startSIG = null;
 	this.endSIG = null;

 	this.startSignedInfo = null;
 	this.endContent = null;

 	this.rawSignatureData = null;
 };

 ContentObject.prototype.sign = function(){

 	var n1 = this.encodeObject(this.name);
 	var n2 = this.encodeObject(this.signedInfo);
 	var n3 = this.encodeContent();
 	/*console.log('sign: ');
 	console.log(n1);
 	console.log(n2);
 	console.log(n3);*/

 	//var n = n1.concat(n2,n3);
 	var tempBuf = new ArrayBuffer(n1.length + n2.length + n3.length);
 	var n = new Uint8Array(tempBuf);
 	//console.log(n);
 	n.set(n1, 0);
 	//console.log(n);
 	n.set(n2, n1.length);
 	//console.log(n);
 	n.set(n3, n1.length + n2.length);
 	//console.log(n);

 	if(LOG>4)console.log('Signature Data is (binary) '+n);

 	if(LOG>4)console.log('Signature Data is (RawString)');

 	if(LOG>4)console.log( DataUtils.toString(n) );

 	//var sig = DataUtils.toString(n);


 	var rsa = new RSAKey();

 	rsa.readPrivateKeyFromPEMString(globalKeyManager.privateKey);

 	//var hSig = rsa.signString(sig, "sha256");

 	var hSig = rsa.signByteArrayWithSHA256(n);


 	if(LOG>4)console.log('SIGNATURE SAVED IS');

 	if(LOG>4)console.log(hSig);

 	if(LOG>4)console.log(  DataUtils.toNumbers(hSig.trim()));

 	this.signature.signature = DataUtils.toNumbers(hSig.trim());


 };

 ContentObject.prototype.encodeObject = function encodeObject(obj){
 	var enc = new BinaryXMLEncoder();

 	obj.to_ccnb(enc);

 	var num = enc.getReducedOstream();

 	return num;


 };

 ContentObject.prototype.encodeContent = function encodeContent(obj){
 	var enc = new BinaryXMLEncoder();

 	enc.writeElement(CCNProtocolDTags.Content, this.content);

 	var num = enc.getReducedOstream();

 	return num;


 };

 ContentObject.prototype.saveRawData = function(bytes){

 	var sigBits = bytes.subarray(this.startSIG, this.endSIG);

 	this.rawSignatureData = sigBits;
 };

 ContentObject.prototype.from_ccnb = function(/*XMLDecoder*/ decoder) {

 	// TODO VALIDATE THAT ALL FIELDS EXCEPT SIGNATURE ARE PRESENT

 		decoder.readStartElement(this.getElementLabel());


 		if( decoder.peekStartElement(CCNProtocolDTags.Signature) ){
 			this.signature = new Signature();
 			this.signature.from_ccnb(decoder);
 		}

 		//this.endSIG = decoder.offset;

 		this.startSIG = decoder.offset;

 		this.name = new Name();
 		this.name.from_ccnb(decoder);

 		//this.startSignedInfo = decoder.offset;


 		if( decoder.peekStartElement(CCNProtocolDTags.SignedInfo) ){
 			this.signedInfo = new SignedInfo();
 			this.signedInfo.from_ccnb(decoder);
 		}

 		this.content = decoder.readBinaryElement(CCNProtocolDTags.Content);


 		//this.endContent = decoder.offset;
 		this.endSIG = decoder.offset;


 		decoder.readEndElement();

 		this.saveRawData(decoder.istream);
 };

 ContentObject.prototype.to_ccnb = function(/*XMLEncoder*/ encoder)  {

 	//TODO verify name, SignedInfo and Signature is present


 	encoder.writeStartElement(this.getElementLabel());


 	if(null!=this.signature) this.signature.to_ccnb(encoder);


 	this.startSIG = encoder.offset;


 	if(null!=this.name) this.name.to_ccnb(encoder);

 	//this.endSIG = encoder.offset;
 	//this.startSignedInfo = encoder.offset;


 	if(null!=this.signedInfo) this.signedInfo.to_ccnb(encoder);

 	encoder.writeElement(CCNProtocolDTags.Content, this.content);


 	this.endSIG = encoder.offset;

 	//this.endContent = encoder.offset;


 	encoder.writeEndElement();

 	this.saveRawData(encoder.ostream);

 };

 ContentObject.prototype.getElementLabel= function(){return CCNProtocolDTags.ContentObject;};

 /**
  * Signature
  */
 var Signature = function Signature(_witness,_signature,_digestAlgorithm) {

     this.Witness = _witness;//byte [] _witness;
 	this.signature = _signature;//byte [] _signature;
 	this.digestAlgorithm = _digestAlgorithm//String _digestAlgorithm;
 };

 Signature.prototype.from_ccnb =function( decoder) {
 		decoder.readStartElement(this.getElementLabel());

 		if(LOG>4)console.log('STARTED DECODING SIGNATURE');

 		if (decoder.peekStartElement(CCNProtocolDTags.DigestAlgorithm)) {
 			if(LOG>4)console.log('DIGIEST ALGORITHM FOUND');
 			this.digestAlgorithm = decoder.readUTF8Element(CCNProtocolDTags.DigestAlgorithm);
 		}
 		if (decoder.peekStartElement(CCNProtocolDTags.Witness)) {
 			if(LOG>4)console.log('WITNESS FOUND');
 			this.Witness = decoder.readBinaryElement(CCNProtocolDTags.Witness);
 		}

 		//FORCE TO READ A SIGNATURE

 			if(LOG>4)console.log('SIGNATURE FOUND');
 			this.signature = decoder.readBinaryElement(CCNProtocolDTags.SignatureBits);

 		decoder.readEndElement();

 };


 Signature.prototype.to_ccnb= function( encoder){

 	if (!this.validate()) {
 		throw new Error("Cannot encode: field values missing.");
 	}

 	encoder.writeStartElement(this.getElementLabel());

 	if ((null != this.digestAlgorithm) && (!this.digestAlgorithm.equals(CCNDigestHelper.DEFAULT_DIGEST_ALGORITHM))) {
 		encoder.writeElement(CCNProtocolDTags.DigestAlgorithm, OIDLookup.getDigestOID(this.DigestAlgorithm));
 	}

 	if (null != this.Witness) {
 		// needs to handle null witness
 		encoder.writeElement(CCNProtocolDTags.Witness, this.Witness);
 	}

 	encoder.writeElement(CCNProtocolDTags.SignatureBits, this.signature);

 	encoder.writeEndElement();
 };

 Signature.prototype.getElementLabel = function() { return CCNProtocolDTags.Signature; };


 Signature.prototype.validate = function() {
 		return null != this.signature;
 };


 /**
  * SignedInfo
  */
 var ContentType = {DATA:0, ENCR:1, GONE:2, KEY:3, LINK:4, NACK:5};
 var ContentTypeValue = {0:0x0C04C0, 1:0x10D091,2:0x18E344,3:0x28463F,4:0x2C834A,5:0x34008A};
 var ContentTypeValueReverse = {0x0C04C0:0, 0x10D091:1,0x18E344:2,0x28463F:3,0x2C834A:4,0x34008A:5};

 var SignedInfo = function SignedInfo(_publisher,_timestamp,_type,_locator,_freshnessSeconds,_finalBlockID){

 	//TODO, Check types

     this.publisher = _publisher; //publisherPublicKeyDigest
     this.timestamp=_timestamp; // CCN Time
     this.type=_type; // ContentType
     this.locator =_locator;//KeyLocator
     this.freshnessSeconds =_freshnessSeconds; // Integer
     this.finalBlockID=_finalBlockID; //byte array

     // SWT: merge setFields() method into constructor
     this.setFields();

 };

 SignedInfo.prototype.setFields = function(){
 	//BASE64 -> RAW STRING

 	//this.locator = new KeyLocator(  DataUtils.toNumbersFromString(stringCertificate)  ,KeyLocatorType.CERTIFICATE );

 	var publicKeyHex = globalKeyManager.publicKey;

 	if(LOG>4)console.log('PUBLIC KEY TO WRITE TO CONTENT OBJECT IS ');
 	if(LOG>4)console.log(publicKeyHex);

 	var publicKeyBytes = DataUtils.toNumbers(globalKeyManager.publicKey) ;


 	//var stringCertificate = DataUtils.base64toString(globalKeyManager.certificate);

 	//if(LOG>3)console.log('string Certificate is '+stringCertificate);

 	//HEX -> BYTE ARRAY
 	//var publisherkey = DataUtils.toNumbers(hex_sha256(stringCertificate));

 	//if(LOG>3)console.log('publisher key is ');
 	//if(LOG>3)console.log(publisherkey);

 	var publisherKeyDigest = hex_sha256_from_bytes(publicKeyBytes);

 	this.publisher = new PublisherPublicKeyDigest(  DataUtils.toNumbers(  publisherKeyDigest )  );

 	//this.publisher = new PublisherPublicKeyDigest(publisherkey);

 	var d = new Date();

 	var time = d.getTime();


     this.timestamp = new CCNTime( time );

     if(LOG>4)console.log('TIME msec is');

     if(LOG>4)console.log(this.timestamp.msec);

     //DATA
 	this.type = 0;//0x0C04C0;//ContentTypeValue[ContentType.DATA];

 	//if(LOG>4)console.log('toNumbersFromString(stringCertificate) '+DataUtils.toNumbersFromString(stringCertificate));

 	if(LOG>4)console.log('PUBLIC KEY TO WRITE TO CONTENT OBJECT IS ');
 	if(LOG>4)console.log(publicKeyBytes);

 	this.locator = new KeyLocator(  publicKeyBytes  ,KeyLocatorType.KEY );

 	//this.locator = new KeyLocator(  DataUtils.toNumbersFromString(stringCertificate)  ,KeyLocatorType.CERTIFICATE );

 };

 SignedInfo.prototype.from_ccnb = function( decoder){

 		decoder.readStartElement( this.getElementLabel() );

 		if (decoder.peekStartElement(CCNProtocolDTags.PublisherPublicKeyDigest)) {
 			if(LOG>4)console.log('DECODING PUBLISHER KEY');
 			this.publisher = new PublisherPublicKeyDigest();
 			this.publisher.from_ccnb(decoder);
 		}

 		if (decoder.peekStartElement(CCNProtocolDTags.Timestamp)) {
 			if(LOG>4)console.log('DECODING TIMESTAMP');
 			this.timestamp = decoder.readDateTime(CCNProtocolDTags.Timestamp);
 		}

 		if (decoder.peekStartElement(CCNProtocolDTags.Type)) {
 			binType = decoder.readBinaryElement(CCNProtocolDTags.Type);//byte []


 			//TODO Implement type of Key Reading

 			if(LOG>4)console.log('Binary Type of of Signed Info is '+binType);

 			this.type = binType;


 			//TODO Implement type of Key Reading


 			if (null == this.type) {
 				throw new Error("Cannot parse signedInfo type: bytes.");
 			}

 		} else {
 			this.type = ContentType.DATA; // default
 		}

 		if (decoder.peekStartElement(CCNProtocolDTags.FreshnessSeconds)) {
 			this.freshnessSeconds = decoder.readIntegerElement(CCNProtocolDTags.FreshnessSeconds);
 			if(LOG>4)console.log('FRESHNESS IN SECONDS IS '+ this.freshnessSeconds);
 		}

 		if (decoder.peekStartElement(CCNProtocolDTags.FinalBlockID)) {
 			if(LOG>4)console.log('DECODING FINAL BLOCKID');
 			this.finalBlockID = decoder.readBinaryElement(CCNProtocolDTags.FinalBlockID);
 		}

 		if (decoder.peekStartElement(CCNProtocolDTags.KeyLocator)) {
 			if(LOG>4)console.log('DECODING KEY LOCATOR');
 			this.locator = new KeyLocator();
 			this.locator.from_ccnb(decoder);
 		}

 		decoder.readEndElement();
 };

 SignedInfo.prototype.to_ccnb = function( encoder)  {
 		if (!this.validate()) {
 			throw new Error("Cannot encode : field values missing.");
 		}
 		encoder.writeStartElement(this.getElementLabel());

 		if (null!=this.publisher) {
 			if(LOG>3) console.log('ENCODING PUBLISHER KEY' + this.publisher.publisherPublicKeyDigest);

 			this.publisher.to_ccnb(encoder);
 		}

 		if (null!=this.timestamp) {
 			encoder.writeDateTime(CCNProtocolDTags.Timestamp, this.timestamp );
 		}

 		if (null!=this.type && this.type !=0) {

 			encoder.writeElement(CCNProtocolDTags.type, this.type);
 		}

 		if (null!=this.freshnessSeconds) {
 			encoder.writeElement(CCNProtocolDTags.FreshnessSeconds, this.freshnessSeconds);
 		}

 		if (null!=this.finalBlockID) {
 			encoder.writeElement(CCNProtocolDTags.FinalBlockID, this.finalBlockID);
 		}

 		if (null!=this.locator) {
 			this.locator.to_ccnb(encoder);
 		}

 		encoder.writeEndElement();
 };

 SignedInfo.prototype.valueToType = function(){
 	//for (Entry<byte [], ContentType> entry : ContentValueTypes.entrySet()) {
 		//if (Arrays.equals(value, entry.getKey()))
 			//return entry.getValue();
 		//}
 	return null;

 };

 SignedInfo.prototype.getElementLabel = function() {
 	return CCNProtocolDTags.SignedInfo;
 };

 SignedInfo.prototype.validate = function() {
 		// We don't do partial matches any more, even though encoder/decoder
 		// is still pretty generous.
 		if (null ==this.publisher || null==this.timestamp ||null== this.locator)
 			return false;
 		return true;
 };
	/**
	* @author: Meki Cheraoui
	* See COPYING for copyright and distribution information.
	* This class represents ContentObject Objects
	*/
	var ContentObject = function ContentObject(_name,_signedInfo,_content,_signature){


	if (typeof _name == 'string') {
	this.name = new Name(_name);
	}
	else{
	//TODO Check the class of _name
	this.name = _name;
	}
	this.signedInfo = _signedInfo;

	if (typeof _content == 'string') {
	this.content = DataUtils.toNumbersFromString(_content);
	} else {
	this.content = _content;
	}

	this.signature = _signature;


	this.startSIG = null;
	this.endSIG = null;

	this.startSignedInfo = null;
	this.endContent = null;

	this.rawSignatureData = null;
	};

	ContentObject.prototype.sign = function(){

	var n1 = this.encodeObject(this.name);
	var n2 = this.encodeObject(this.signedInfo);
	var n3 = this.encodeContent();
	/*console.log('sign: ');
	console.log(n1);
	console.log(n2);
	console.log(n3);*/

	//var n = n1.concat(n2,n3);
	var tempBuf = new ArrayBuffer(n1.length + n2.length + n3.length);
	var n = new Uint8Array(tempBuf);
	//console.log(n);
	n.set(n1, 0);
	//console.log(n);
	n.set(n2, n1.length);
	//console.log(n);
	n.set(n3, n1.length + n2.length);
	//console.log(n);

	if(LOG>4)console.log('Signature Data is (binary) '+n);

	if(LOG>4)console.log('Signature Data is (RawString)');

	if(LOG>4)console.log( DataUtils.toString(n) );

	//var sig = DataUtils.toString(n);


	var rsa = new RSAKey();

	rsa.readPrivateKeyFromPEMString(globalKeyManager.privateKey);

	//var hSig = rsa.signString(sig, "sha256");

	var hSig = rsa.signByteArrayWithSHA256(n);


	if(LOG>4)console.log('SIGNATURE SAVED IS');

	if(LOG>4)console.log(hSig);

	if(LOG>4)console.log( DataUtils.toNumbers(hSig.trim()));

	this.signature.signature = DataUtils.toNumbers(hSig.trim());


	};

	ContentObject.prototype.encodeObject = function encodeObject(obj){
	var enc = new BinaryXMLEncoder();

	obj.to_ccnb(enc);

	var num = enc.getReducedOstream();

	return num;


	};

	ContentObject.prototype.encodeContent = function encodeContent(obj){
	var enc = new BinaryXMLEncoder();

	enc.writeElement(CCNProtocolDTags.Content, this.content);

	var num = enc.getReducedOstream();

	return num;


	};

	ContentObject.prototype.saveRawData = function(bytes){

	var sigBits = bytes.subarray(this.startSIG, this.endSIG);

	this.rawSignatureData = sigBits;
	};

	ContentObject.prototype.from_ccnb = function(/XMLDecoder/ decoder) {

	// TODO VALIDATE THAT ALL FIELDS EXCEPT SIGNATURE ARE PRESENT

	decoder.readStartElement(this.getElementLabel());


	if( decoder.peekStartElement(CCNProtocolDTags.Signature) ){
	this.signature = new Signature();
	this.signature.from_ccnb(decoder);
	}

	//this.endSIG = decoder.offset;

	this.startSIG = decoder.offset;

	this.name = new Name();
	this.name.from_ccnb(decoder);

	//this.startSignedInfo = decoder.offset;


	if( decoder.peekStartElement(CCNProtocolDTags.SignedInfo) ){
	this.signedInfo = new SignedInfo();
	this.signedInfo.from_ccnb(decoder);
	}

	this.content = decoder.readBinaryElement(CCNProtocolDTags.Content);


	//this.endContent = decoder.offset;
	this.endSIG = decoder.offset;


	decoder.readEndElement();

	this.saveRawData(decoder.istream);
	};

	ContentObject.prototype.to_ccnb = function(/XMLEncoder/ encoder) {

	//TODO verify name, SignedInfo and Signature is present


	encoder.writeStartElement(this.getElementLabel());




	if(null!=this.signature) this.signature.to_ccnb(encoder);


	this.startSIG = encoder.offset;


	if(null!=this.name) this.name.to_ccnb(encoder);

	//this.endSIG = encoder.offset;
	//this.startSignedInfo = encoder.offset;


	if(null!=this.signedInfo) this.signedInfo.to_ccnb(encoder);

	encoder.writeElement(CCNProtocolDTags.Content, this.content);


	this.endSIG = encoder.offset;

	//this.endContent = encoder.offset;


	encoder.writeEndElement();

	this.saveRawData(encoder.ostream);

	};

	ContentObject.prototype.getElementLabel= function(){return CCNProtocolDTags.ContentObject;};

	/**
	* Signature
	*/
	var Signature = function Signature(_witness,_signature,_digestAlgorithm) {

	this.Witness = _witness;//byte [] _witness;
	this.signature = _signature;//byte [] _signature;
	this.digestAlgorithm = _digestAlgorithm//String _digestAlgorithm;
	};

	Signature.prototype.from_ccnb =function( decoder) {
	decoder.readStartElement(this.getElementLabel());

	if(LOG>4)console.log('STARTED DECODING SIGNATURE');

	if (decoder.peekStartElement(CCNProtocolDTags.DigestAlgorithm)) {
	if(LOG>4)console.log('DIGIEST ALGORITHM FOUND');
	this.digestAlgorithm = decoder.readUTF8Element(CCNProtocolDTags.DigestAlgorithm);
	}
	if (decoder.peekStartElement(CCNProtocolDTags.Witness)) {
	if(LOG>4)console.log('WITNESS FOUND');
	this.Witness = decoder.readBinaryElement(CCNProtocolDTags.Witness);
	}

	//FORCE TO READ A SIGNATURE

	if(LOG>4)console.log('SIGNATURE FOUND');
	this.signature = decoder.readBinaryElement(CCNProtocolDTags.SignatureBits);

	decoder.readEndElement();

	};


	Signature.prototype.to_ccnb= function( encoder){

	if (!this.validate()) {
	throw new Error("Cannot encode: field values missing.");
	}

	encoder.writeStartElement(this.getElementLabel());

	if ((null != this.digestAlgorithm) && (!this.digestAlgorithm.equals(CCNDigestHelper.DEFAULT_DIGEST_ALGORITHM))) {
	encoder.writeElement(CCNProtocolDTags.DigestAlgorithm, OIDLookup.getDigestOID(this.DigestAlgorithm));
	}

	if (null != this.Witness) {
	// needs to handle null witness
	encoder.writeElement(CCNProtocolDTags.Witness, this.Witness);
	}

	encoder.writeElement(CCNProtocolDTags.SignatureBits, this.signature);

	encoder.writeEndElement();
	};

	Signature.prototype.getElementLabel = function() { return CCNProtocolDTags.Signature; };


	Signature.prototype.validate = function() {
	return null != this.signature;
	};


	/**
	* SignedInfo
	*/
	var ContentType = {DATA:0, ENCR:1, GONE:2, KEY:3, LINK:4, NACK:5};
	var ContentTypeValue = {0:0x0C04C0, 1:0x10D091,2:0x18E344,3:0x28463F,4:0x2C834A,5:0x34008A};
	var ContentTypeValueReverse = {0x0C04C0:0, 0x10D091:1,0x18E344:2,0x28463F:3,0x2C834A:4,0x34008A:5};

	var SignedInfo = function SignedInfo(_publisher,_timestamp,_type,_locator,_freshnessSeconds,_finalBlockID){

	//TODO, Check types

	this.publisher = _publisher; //publisherPublicKeyDigest
	this.timestamp=_timestamp; // CCN Time
	this.type=_type; // ContentType
	this.locator =_locator;//KeyLocator
	this.freshnessSeconds =_freshnessSeconds; // Integer
	this.finalBlockID=_finalBlockID; //byte array

	// SWT: merge setFields() method into constructor
	this.setFields();

	};

	SignedInfo.prototype.setFields = function(){
	//BASE64 -> RAW STRING

	//this.locator = new KeyLocator( DataUtils.toNumbersFromString(stringCertificate) ,KeyLocatorType.CERTIFICATE );

	var publicKeyHex = globalKeyManager.publicKey;

	if(LOG>4)console.log('PUBLIC KEY TO WRITE TO CONTENT OBJECT IS ');
	if(LOG>4)console.log(publicKeyHex);

	var publicKeyBytes = DataUtils.toNumbers(globalKeyManager.publicKey) ;



	//var stringCertificate = DataUtils.base64toString(globalKeyManager.certificate);

	//if(LOG>3)console.log('string Certificate is '+stringCertificate);

	//HEX -> BYTE ARRAY
	//var publisherkey = DataUtils.toNumbers(hex_sha256(stringCertificate));

	//if(LOG>3)console.log('publisher key is ');
	//if(LOG>3)console.log(publisherkey);

	var publisherKeyDigest = hex_sha256_from_bytes(publicKeyBytes);

	this.publisher = new PublisherPublicKeyDigest( DataUtils.toNumbers( publisherKeyDigest ) );

	//this.publisher = new PublisherPublicKeyDigest(publisherkey);

	var d = new Date();

	var time = d.getTime();


	this.timestamp = new CCNTime( time );

	if(LOG>4)console.log('TIME msec is');

	if(LOG>4)console.log(this.timestamp.msec);

	//DATA
	this.type = 0;//0x0C04C0;//ContentTypeValue[ContentType.DATA];

	//if(LOG>4)console.log('toNumbersFromString(stringCertificate) '+DataUtils.toNumbersFromString(stringCertificate));

	if(LOG>4)console.log('PUBLIC KEY TO WRITE TO CONTENT OBJECT IS ');
	if(LOG>4)console.log(publicKeyBytes);

	this.locator = new KeyLocator( publicKeyBytes ,KeyLocatorType.KEY );

	//this.locator = new KeyLocator( DataUtils.toNumbersFromString(stringCertificate) ,KeyLocatorType.CERTIFICATE );

	};

	SignedInfo.prototype.from_ccnb = function( decoder){

	decoder.readStartElement( this.getElementLabel() );

	if (decoder.peekStartElement(CCNProtocolDTags.PublisherPublicKeyDigest)) {
	if(LOG>4)console.log('DECODING PUBLISHER KEY');
	this.publisher = new PublisherPublicKeyDigest();
	this.publisher.from_ccnb(decoder);
	}

	if (decoder.peekStartElement(CCNProtocolDTags.Timestamp)) {
	if(LOG>4)console.log('DECODING TIMESTAMP');
	this.timestamp = decoder.readDateTime(CCNProtocolDTags.Timestamp);
	}

	if (decoder.peekStartElement(CCNProtocolDTags.Type)) {
	binType = decoder.readBinaryElement(CCNProtocolDTags.Type);//byte []


	//TODO Implement type of Key Reading

	if(LOG>4)console.log('Binary Type of of Signed Info is '+binType);

	this.type = binType;


	//TODO Implement type of Key Reading


	if (null == this.type) {
	throw new Error("Cannot parse signedInfo type: bytes.");
	}

	} else {
	this.type = ContentType.DATA; // default
	}

	if (decoder.peekStartElement(CCNProtocolDTags.FreshnessSeconds)) {
	this.freshnessSeconds = decoder.readIntegerElement(CCNProtocolDTags.FreshnessSeconds);
	if(LOG>4)console.log('FRESHNESS IN SECONDS IS '+ this.freshnessSeconds);
	}

	if (decoder.peekStartElement(CCNProtocolDTags.FinalBlockID)) {
	if(LOG>4)console.log('DECODING FINAL BLOCKID');
	this.finalBlockID = decoder.readBinaryElement(CCNProtocolDTags.FinalBlockID);
	}

	if (decoder.peekStartElement(CCNProtocolDTags.KeyLocator)) {
	if(LOG>4)console.log('DECODING KEY LOCATOR');
	this.locator = new KeyLocator();
	this.locator.from_ccnb(decoder);
	}

	decoder.readEndElement();
	};

	SignedInfo.prototype.to_ccnb = function( encoder) {
	if (!this.validate()) {
	throw new Error("Cannot encode : field values missing.");
	}
	encoder.writeStartElement(this.getElementLabel());

	if (null!=this.publisher) {
	if(LOG>3) console.log('ENCODING PUBLISHER KEY' + this.publisher.publisherPublicKeyDigest);

	this.publisher.to_ccnb(encoder);
	}

	if (null!=this.timestamp) {
	encoder.writeDateTime(CCNProtocolDTags.Timestamp, this.timestamp );
	}

	if (null!=this.type && this.type !=0) {

	encoder.writeElement(CCNProtocolDTags.type, this.type);
	}

	if (null!=this.freshnessSeconds) {
	encoder.writeElement(CCNProtocolDTags.FreshnessSeconds, this.freshnessSeconds);
	}

	if (null!=this.finalBlockID) {
	encoder.writeElement(CCNProtocolDTags.FinalBlockID, this.finalBlockID);
	}

	if (null!=this.locator) {
	this.locator.to_ccnb(encoder);
	}

	encoder.writeEndElement();
	};

	SignedInfo.prototype.valueToType = function(){
	//for (Entry<byte [], ContentType> entry : ContentValueTypes.entrySet()) {
	//if (Arrays.equals(value, entry.getKey()))
	//return entry.getValue();
	//}
	return null;

	};

	SignedInfo.prototype.getElementLabel = function() {
	return CCNProtocolDTags.SignedInfo;
	};

	SignedInfo.prototype.validate = function() {
	// We don't do partial matches any more, even though encoder/decoder
	// is still pretty generous.
	if (null ==this.publisher \|\| null==this.timestamp \|\|null== this.locator)
	return false;
	return true;
	};