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## crlgenerator.js

#### Summary

Simple CRL generator class

Class Summary
CRLGenerator | Class implementing a CRL certificate generator

Method Summary
`static void` | `CRLGeneratorTest()`

    /**
     *  ---------
     * |.##> <##.|  Open Smart Card Development Platform (www.openscdp.org)
     * |#       #|
     * |#       #|  Copyright (c) 1999-2009 CardContact Software & System Consulting
     * |'##> <##'|  Andreas Schwier, 32429 Minden, Germany (www.cardcontact.de)
     *  ---------
     *
     *  This file is part of OpenSCDP.
     *
     *  OpenSCDP is free software; you can redistribute it and/or modify
     *  it under the terms of the GNU General Public License version 2 as
     *  published by the Free Software Foundation.
     *
     *  OpenSCDP is distributed in the hope that it will be useful,
     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *  GNU General Public License for more details.
     *
     *  You should have received a copy of the GNU General Public License
     *  along with OpenSCDP; if not, write to the Free Software
     *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     *
     * @fileoverview
     * Simple CRL generator class
     */

    if (typeof(__ScriptingServer) == "undefined") {
    	load("pkixcommon.js");
    }

    /**
     * Create a Certificate Revocation List (CRL) generator.
     *
     * @class Class implementing a CRL certificate generator
     * @constructor
     *
     * @param {Crypto} crypto the crypto provider to use for signing operations
     */
    function CRLGenerator(crypto) {
    	this.crypto = crypto;
    	this.reset();
    }

    CRLGenerator.unspecified = 0;
    CRLGenerator.keyCompromise = 1;
    CRLGenerator.cACompromise = 2;
    CRLGenerator.affiliationChanged = 3;
    CRLGenerator.superseded = 4;
    CRLGenerator.cessationOfOperation = 5;
    CRLGenerator.certificateHold = 6;
    CRLGenerator.removeFromCRL = 8;
    CRLGenerator.privilegeWithdrawn = 9;
    CRLGenerator.aACompromise = 10;

    /**
     * Resets all internal state variables.
     *
     */
    CRLGenerator.prototype.reset = function() {
    	this.extensions = [];
    	this.revokedCertificates = [];
    	this.nextUpdate = null;
    }

    /**
     * Sets the isser name.
     *
     * <p>The issuer name must be a JavaScript object containing the properties:</p>
     * <ul>
     *  <li>C - the country</li>
     *  <li>O - the organization</li>
     *  <li>OU - the organization unit</li>
     *  <li>CN - the common name</li>
     * </ul>
     * <p>Example:</p>
     * <pre>
     *	var issuer = { C:"UT", O:"ACME Corporation", CN:"Test-CA" };
     * </pre>
     * @param {Object} issuer the issuer name
     */
    CRLGenerator.prototype.setIssuer = function(issuer) {
    	this.issuer = issuer;
    }

    /**
     * Sets the timestamp for this CRL
     *
     * @param {Date} datetime the current date and time
     */
    CRLGenerator.prototype.setThisUpdate = function(datetime) {
    	this.thisUpdate = datetime;
    }

    /**
     * Sets the timestamp for the next update
     *
     * @param {Date} datetime the date and time of the next update
     */
    CRLGenerator.prototype.setNextUpdate = function(datetime) {
    	this.nextUpdate = datetime;
    }

    /**
     * Sets the signature algorithm.
     *
     * @param {Number} alg the signature algorithm, must be one of Crypto.RSA, Crypto.RSA_SHA256 or Crypto.ECDSA_SHA256
     */
    CRLGenerator.prototype.setSignatureAlgorithm = function(alg) {
    	this.signatureAlgorithm = alg;
    }

    /**
     * Adds an extension to the CRL
     *
     * <p>The structure is defined as:</p>
     * <pre>
     *    Extension  ::=  SEQUENCE  {
     *        extnID      OBJECT IDENTIFIER,
     *        critical    BOOLEAN DEFAULT FALSE,
     *        extnValue   OCTET STRING
     *                    -- contains the DER encoding of an ASN.1 value
     *                    -- corresponding to the extension type identified
     *                    -- by extnID
     *        }
     *</pre>
     * @param {String} extnID the extensions object identifier
     * @param {Boolean} critical the extension is critical
     * @param {ByteString} the extension value as ByteString
     */
    CRLGenerator.prototype.addExtension = function(extnID, critical, extnValue) {
    	var t = new ASN1("extension", ASN1.SEQUENCE,
    				new ASN1("extnID", ASN1.OBJECT_IDENTIFIER, new ByteString(extnID, OID))
    			);

    	if (critical) {
    		t.add(new ASN1("critical", ASN1.BOOLEAN, new ByteString("FF", HEX)));
    	}

    	t.add(new ASN1("extnValue", ASN1.OCTET_STRING, extnValue));
    	this.extensions.push(t);

    }

    /**
     * Adds the authority public key identifier extension based on the issuers key.
     *
     * <p>The key identifier is calculated as SHA-1 hash over the contents of the
     * issuer public key (Without tag, length and number of unused bits.</p>
     */
    CRLGenerator.prototype.addAuthorityKeyIdentifierExtension = function(publicKey) {
    	if (publicKey.getComponent(Key.MODULUS)) {
    		var spi = PKIXCommon.createRSASubjectPublicKeyInfo(publicKey);
    	} else {
    		var spi = PKIXCommon.createECSubjectPublicKeyInfo(publicKey, this.encodeECDomainParameter);
    	}

    	var keyvalue = spi.get(1).value.bytes(1);
    	var hash = this.crypto.digest(Crypto.SHA_1, keyvalue);

    	var t = new ASN1(ASN1.SEQUENCE,
    					new ASN1(0x80, hash)
    				);
    	this.addExtension("id-ce-authorityKeyIdentifier", false, t.getBytes());
    }

    /**
     * Adds the CRL number extension.
     *
     */
    CRLGenerator.prototype.addCRLNumberExtension = function(crlnumber) {
    	var t = new ASN1(ASN1.INTEGER,
    					PKIXCommon.convertUnsignedInteger(ByteString.valueOf(crlnumber))
    				);
    	this.addExtension("id-ce-cRLNumber", false, t.getBytes());
    }

    /**
     * Add a revoked certificate to the list. This adds the complete DER encoded structure.
     *
     * @param {ASN1} revokedCertificate the information related to the revoked certificate
     */
    CRLGenerator.prototype.addRevokedCertificate = function(revokedCertificate) {
    	this.revokedCertificates.push(revokedCertificate);
    }

    /**
     * Add a revoked certificate to the list. This adds the complete DER encoded structure.
     *
     * @param {ByteString} serial the serial number of the certificate to revoke
     * @param {Date} timestamp the revocation time, optional, default is now
     * @param {Number) reason the revocation reason
     * @param {ASN1) ext the crl entry extensions
     */
    CRLGenerator.prototype.revokeCertificate = function(serial, timestamp, reason, ext) {
    	if (typeof(timestamp) == "undefined") {
    		timestamp = new Date();
    	}
    	var t = new ASN1("revokedCertificate", ASN1.SEQUENCE,
    				new ASN1("userCertificate", ASN1.INTEGER, PKIXCommon.convertUnsignedInteger(serial)),
    				new ASN1("revocationTime", ASN1.UTCTime, new ByteString(PKIXCommon.dtoUTC(timestamp), ASCII))
    				);

    	if (typeof(ext) == "undefined") {
    		ext = new ASN1("crlExtensions", ASN1.SEQUENCE);
    	}

    	if ((typeof(reason) != "undefined") && (reason != -1)) {
    		ext.add(new ASN1("reason", ASN1.SEQUENCE,
    					new ASN1("extnID", ASN1.OBJECT_IDENTIFIER, new ByteString("id-ce-cRLReasons", OID)),
    					new ASN1("extnValue", ASN1.OCTET_STRING,
    						(new ASN1("cRLReason", ASN1.ENUMERATED, ByteString.valueOf(reason))).getBytes())
    					)
    				);
    		t.add(ext);
    	}

    	this.revokedCertificates.push(t);
    }

    /**
     * Load list of revoked certificates from an existing CRL
     *
     * @param {String} filename the file name of the DER encoded CRL
     * @type Number
     * @return the value of the CRLNumber extension, 0 if extension not defined or -1 if file could not be loaded
     */
    CRLGenerator.prototype.loadCRLEntries = function(filename) {
    	var crlnumber = 0;

    	try	{
    		var crlbin = PKIXCommon.readFileFromDisk(filename);
    		var crl = new ASN1(crlbin);
    		print(crl);
    		var tbs = crl.get(0);
    		var i = 0;
    		if ((i < tbs.length) && (tbs.get(i).tag == ASN1.INTEGER)) {		// Skip version if present
    			i++;
    		}
    		i += 3;		// Skip signature, issuer, thisUpdate
    		if ((i < tbs.length) && (tbs.get(i).tag == ASN1.UTCTime)) {		// nextUpdate if present
    			i++;
    		}
    		if ((i < tbs.length) && (tbs.get(i).tag == ASN1.SEQUENCE)) {
    			for (var j = 0; j < tbs.get(i).elements; j++) {
    				this.revokedCertificates.push(tbs.get(i).get(j));
    			}
    			i++;
    		}
    		if ((i < tbs.length) && (tbs.get(i).tag == 0xA0)) {
    			var l = tbs.get(i).get(0);
    			var oid = new ByteString("id-ce-cRLNumber", OID);
    			for (var j = 0; j < l.elements; j++) {
    				var ext = l.get(j);
    				if (ext.get(0).value.equals(oid)) {
    					var extval = new ASN1(ext.get(1).value);
    					crlnumber = extval.value.toUnsigned();
    				}
    			}

    		}
    	}
    	catch(e) {
    		GPSystem.trace(e);
    		return -1;
    	}
    	return crlnumber;
    }

    /**
     * Gets the issuer name as TLV object
     *
     * @return the issuer RDNSequence
     * @type ASN1
     */
    CRLGenerator.prototype.getIssuer = function() {
    	if (this.issuer instanceof ASN1) {
    		return this.issuer;
    	} else {
    		return PKIXCommon.encodeName(this.issuer);
    	}
    }

    /**
     * Gets the thisUpdate TLV object
     *
     * @return the thisUpdate UTC encoded time
     * @type ASN1
     */
    CRLGenerator.prototype.getThisUpdate = function() {
    	var t = new ASN1("thisUpdate", ASN1.UTCTime, new ByteString(PKIXCommon.dtoUTC(this.thisUpdate), ASCII));
    	return t;
    }

    /**
     * Gets the nextUpdate TLV object
     *
     * @return the nextUpdate UTC encoded time
     * @type ASN1
     */
    CRLGenerator.prototype.getNextUpdate = function() {
    	var t = new ASN1("nextUpdate", ASN1.UTCTime, new ByteString(PKIXCommon.dtoUTC(this.nextUpdate), ASCII));
    	return t;
    }

    /**
     * Gets the signature algorithm TLV object
     *
     * @return the signature algorithm object
     * @type ASN1
     */
    CRLGenerator.prototype.getSignatureAlgorithm = function() {
    	var t = new ASN1("signatureAlgorithm", ASN1.SEQUENCE);

    	if (this.signatureAlgorithm == Crypto.RSA) {
    		t.add(new ASN1("algorithm", ASN1.OBJECT_IDENTIFIER, new ByteString("1.2.840.113549.1.1.5", OID)));
    		t.add(new ASN1("parameters", ASN1.NULL, new ByteString("", HEX)));
    	} else if (this.signatureAlgorithm == Crypto.RSA_SHA256) {
    		t.add(new ASN1("algorithm", ASN1.OBJECT_IDENTIFIER, new ByteString("1.2.840.113549.1.1.11", OID)));
    		t.add(new ASN1("parameters", ASN1.NULL, new ByteString("", HEX)));
    	} else if (this.signatureAlgorithm == Crypto.ECDSA_SHA256) {
    		t.add(new ASN1("algorithm", ASN1.OBJECT_IDENTIFIER, new ByteString("ecdsa-with-SHA256", OID)));
    		t.add(new ASN1("parameters", ASN1.NULL, new ByteString("", HEX)));
    	} else {
    		throw new GPError("CRLGenerator", GPError.INVALID_MECH, this.signatureAlgorithm, "Invalid algorithm");
    	}

    	return t;
    }

    /**
     * Gets revoked certificates
     *
     * @return the list of revoked certificates
     * @type ASN1
     */
    CRLGenerator.prototype.getRevokedCertificates = function() {
    	var t = new ASN1("revokedCertificates", ASN1.SEQUENCE);
    	for (var i = 0; i < this.revokedCertificates.length; i++) {
    		t.add(this.revokedCertificates[i]);
    	}
    	return t;
    }

    /**
     * Gets the CRL extension as TLV object
     *
     * @return the CRL extensions
     * @type ASN1
     */
    CRLGenerator.prototype.getExtensions = function() {
    	var t = new ASN1("extensions", 0xA0);
    	var s = new ASN1("extensions", ASN1.SEQUENCE);

    	t.add(s);

    	for (var i = 0; i < this.extensions.length; i++) {
    		s.add(this.extensions[i]);
    	}
    	return t;
    }

    /**
     * Gets the part of the CRL that will be signed
     *
     * @return the TBSCertificate part
     * @type ASN1
     */
    CRLGenerator.prototype.getTbsCertificateList = function() {
    	var t = new ASN1("tbsCertList", ASN1.SEQUENCE);
    	t.add(new ASN1("version", ASN1.INTEGER, new ByteString("01", HEX)));
    	t.add(this.getSignatureAlgorithm());
    	t.add(this.getIssuer());
    	t.add(this.getThisUpdate());
    	if (this.nextUpdate != null) {
    		t.add(this.getNextUpdate());
    	}
    	if (this.revokedCertificates.length > 0) {
    		t.add(this.getRevokedCertificates());
    	}
    	if (this.extensions.length > 0) {
    		t.add(this.getExtensions());
    	}
    	return t;
    }

    /**
     * Generates the certificate.
     *
     * @return the generated certificate
     * @type X509
     */
    CRLGenerator.prototype.generateCRL = function(privateKey) {
    	var certlist = new ASN1("certificateList", ASN1.SEQUENCE);

    	var tbs = this.getTbsCertificateList();
    	certlist.add(tbs);
    	certlist.add(this.getSignatureAlgorithm());

    	var signature = this.crypto.sign(privateKey, this.signatureAlgorithm, tbs.getBytes());
    	signature = (new ByteString("00", HEX)).concat(signature);

    	var signatureValue = new ASN1("signatureValue", ASN1.BIT_STRING, signature);
    	certlist.add(signatureValue);

    	return certlist;
    }

    function CRLGeneratorTest() {

    	var crypto = new Crypto();

    	var caPrivateKey = new Key();
    	caPrivateKey.setType(Key.PRIVATE);

    	var caPublicKey = new Key();
    	caPublicKey.setType(Key.PUBLIC);
    	caPublicKey.setSize(1024);

    	crypto.generateKeyPair(Crypto.RSA, caPublicKey, caPrivateKey);

    //	var caPrivKey = new Key("profiles/kp_rsa_private.xml");

    	var x = new CRLGenerator(crypto);

    	x.reset();
    	x.setSignatureAlgorithm(Crypto.RSA);
    	var issuer = [{ C:"UT" },{ O:"ACME Corporation" },{ CN:"Test-CA" }];
    	x.setIssuer(issuer);
    	var now = new Date();
    	x.setThisUpdate(now);
    	var nextMonth = new Date();
    	nextMonth.setMonth((now.getMonth() + 1) % 12);
    	x.setNextUpdate(nextMonth);
    	x.addAuthorityKeyIdentifierExtension(caPublicKey);
    	x.addCRLNumberExtension(11);

    	x.revokeCertificate(new ByteString("01", HEX));
    	x.revokeCertificate(new ByteString("80", HEX), new Date());
    	x.revokeCertificate(new ByteString("80", HEX), new Date(), CRLGenerator.keyCompromise);
    	x.revokeCertificate(new ByteString("80", HEX), new Date(), CRLGenerator.superseded, new ASN1("crlExtensions", ASN1.SEQUENCE));

    	var crl = x.generateCRL(caPrivateKey);

    	var fn = GPSystem.mapFilename("crl.crl", GPSystem.USR);
    	PKIXCommon.writeFileToDisk(fn, crl.getBytes());

    	print(crl);

    	var x = new CRLGenerator(crypto);
    	x.reset();
    	x.setSignatureAlgorithm(Crypto.RSA);
    	var issuer = [{ C:"UT" },{ O:"ACME Corporation" },{ CN:"Test-CA" }];
    	x.setIssuer(issuer);
    	var now = new Date();
    	x.setThisUpdate(now);
    	var nextMonth = new Date();
    	nextMonth.setMonth((now.getMonth() + 1) % 12);
    	x.setNextUpdate(nextMonth);
    	var crlnumber = x.loadCRLEntries(fn);
    	assert(crlnumber == 11);
    	x.addAuthorityKeyIdentifierExtension(caPublicKey);
    	x.addCRLNumberExtension(crlnumber + 1);

    	x.revokeCertificate(crypto.generateRandom(8), new Date(), CRLGenerator.keyCompromise);
    	var crl = x.generateCRL(caPrivateKey);
    //	PKIXCommon.writeFileToDisk(fn, crl.getBytes());

    	print(crl);
    }

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