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## pkcs10.js

#### Summary

A PKCS#10 generator class based on RFC5280

Class Summary
PKCS10Generator | Class implementing a PKCS#10 certificate request

Method Summary
`static Object` | `PKCS10GeneratorTest()`

    /**
     *  ---------
     * |.##> <##.|  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 A PKCS#10 generator class based on RFC5280
     */

    load("pkixcommon.js");

    /**
     * Create a PKCS#10 certificate request
     *
     * @class Class implementing a PKCS#10 certificate request
     * @constructor
     *
     * @param {Crypto} crypto the crypto provider to use for signing operations
     */
    function PKCS10Generator(crypto) {
    	this.crypto = crypto;
    	this.reset();
    }

    /**
     * Resets all internal state variables.
     *
     */
    PKCS10Generator.prototype.reset = function() {
    	this.extensions = new Array();
    	this.attributes = new Array();
    }

    /**
     * Sets the subject name.
     *
     * <p>The subject 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 subject = { C:"UT", O:"ACME Corporation", CN:"Joe Doe" };
     * </pre>
     * @see PKIXCommon.encodeName()
     * @param {Object} subject the subject name
     */
    PKCS10Generator.prototype.setSubject = function(subject) {
    	this.subject = subject;
    }

    /**
     * Sets the subjects public key
     *
     * <p>The methods accepts ECC and RSA Public Keys.</p>
     *
     * @param {Key} publicKey the subjects public key
     */
    PKCS10Generator.prototype.setPublicKey = function(publicKey) {
    	this.publicKey = publicKey;
    }

    /**
     * Sets the signature algorithm. Currently only Crypto.RSA is supported
     *
     * @param {Number} alg the signature algorithm, only Crypto.RSA supported
     */
    PKCS10Generator.prototype.setSignatureAlgorithm = function(alg) {
    	this.signatureAlgorithm = alg;
    }

    /**
     * Adds an extension to the certificate
     *
     * <p>The structure is defined as:</p>
     * <pre>
     *    Extension  ::=  SEQUENCE  {
     *        extnID      OBJECT IDENTIFIER,
     *        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 {ByteString} the extension value as ByteString
     */
    PKCS10Generator.prototype.addExtension = function(extnID, extnValue) {
    	var t = new ASN1("extension", ASN1.SEQUENCE,
    				new ASN1("extnID", ASN1.OBJECT_IDENTIFIER, new ByteString(extnID, OID))
    			);

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

    /**
     * Adds the key usage extension.
     *
     * <p>The following flags are defined:</p>
     * <pre>
     * PKCS10Generator.digitalSignature = 0x0080;
     * PKCS10Generator.nonRepudiation   = 0x0040;
     * PKCS10Generator.keyEncipherment  = 0x0020;
     * PKCS10Generator.dataEncipherment = 0x0010;
     * PKCS10Generator.keyAgreement     = 0x0008;
     * PKCS10Generator.keyCertSign      = 0x0004;
     * PKCS10Generator.cRLSign          = 0x0002;
     * PKCS10Generator.encipherOnly     = 0x0001;
     * PKCS10Generator.decipherOnly     = 0x8000;
     * </pre>
     * @param {Number} the key usage flags as combination of the flags defined above.
     */
    PKCS10Generator.prototype.addKeyUsageExtension = function(flags) {
    	var t = new ASN1(ASN1.BIT_STRING, PKIXCommon.bitstringForInteger(flags));
    	this.addExtension("2.5.29.15", t.getBytes());
    }

    // Deprecated: Use PKIXCommon. instead
    PKCS10Generator.digitalSignature	= 0x0080;
    PKCS10Generator.nonRepudiation		= 0x0040;
    PKCS10Generator.keyEncipherment		= 0x0020;
    PKCS10Generator.dataEncipherment	= 0x0010;
    PKCS10Generator.keyAgreement		= 0x0008;
    PKCS10Generator.keyCertSign			= 0x0004;
    PKCS10Generator.cRLSign				= 0x0002;
    PKCS10Generator.encipherOnly		= 0x0001;
    PKCS10Generator.decipherOnly		= 0x8000;

    /**
     * Adds extended key usages
     *
     * @param {String[]} the list of extended key usage object identifier
     */
    PKCS10Generator.prototype.addExtendedKeyUsageExtension = function(keyusages) {
    	var t = new ASN1(ASN1.SEQUENCE);
    	for (var i = 0; i < keyusages.length; i++) {
    		t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString(keyusages[i], OID)));
    	}
    	this.addExtension("id-ce-extKeyUsage", t.getBytes());
    }

    /**
     * Adds the BasicConstraints extension.
     *
     * @param {Boolean} cA the certificate belongs to a CA
     * @param {Number} pathLenConstraint the maximum number of subordinate CA certificates
     */
    PKCS10Generator.prototype.addBasicConstraintsExtension = function(cA, pathLenConstraint) {
    	var t = new ASN1("BasicConstraints",ASN1.SEQUENCE);
    	if (cA) {
    		t.add(new ASN1("cA", ASN1.BOOLEAN, new ByteString("FF", HEX)));
    	}
    	if (pathLenConstraint >= 0) {
    		var bb = new ByteBuffer();
    		bb.append(pathLenConstraint);
    		t.add(new ASN1("pathLenConstraint", ASN1.INTEGER, bb.toByteString()));
    	}
    	this.addExtension("2.5.29.19", t.getBytes());
    }

    /**
     * Gets the subject name as TLV object
     *
     * @return the issuer RDNSequence
     * @type ASN1
     */
    PKCS10Generator.prototype.getSubject = function() {
    	return PKIXCommon.encodeName(this.subject);
    }

    /**
     * Gets the subject's public key as TLV object
     *
     * @return the subject's public key info
     * @type ASN1
     */
    PKCS10Generator.prototype.getSubjectPublicKeyInfo = function() {
    	if (this.publicKey.getComponent(Key.MODULUS)) {
    		return PKIXCommon.createRSASubjectPublicKeyInfo(this.publicKey);
    	} else {
    		return PKIXCommon.createECSubjectPublicKeyInfo(this.publicKey, this.encodeECDomainParameter);
    	}
    }

    /**
     * Gets the extension attribute as TLV object
     *
     * @return the certificate extensions
     * @type ASN1
     */
    PKCS10Generator.prototype.getExtensions = function() {
    	var t = new ASN1("extensions", ASN1.SEQUENCE);
    	t.add(new ASN1(ASN1.OBJECT_IDENTIFIER, new ByteString("1.2.840.113549 1 9 14", OID)));
    	var s = new ASN1("extensions", ASN1.SET);
    	t.add(s);
    	var l = new ASN1("extensions", ASN1.SEQUENCE);
    	s.add(l);

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

    /**
     * Gets the attributes as TLV object
     *
     * @return the request attributes
     * @type ASN1
     */
    PKCS10Generator.prototype.getAttributes = function() {
    	var t = new ASN1("attributes", 0xA0);

    	if (this.extensions.length > 0) {
    		t.add(this.getExtensions());
    	}

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

    	return t;
    }

    /**
     * Gets the part of the request that will be signed
     *
     * @return the TBSCertificate part
     * @type ASN1
     */
    PKCS10Generator.prototype.getTbsRequest = function() {
    	var t = new ASN1("certificationRequestInfo", ASN1.SEQUENCE);
    	t.add(new ASN1(ASN1.INTEGER, new ByteString("00", HEX)));
    	t.add(this.getSubject());
    	t.add(this.getSubjectPublicKeyInfo());
    	t.add(this.getAttributes());
    	return t;
    }

    /**
     * Gets the signature algorithm TLV object
     *
     * @return the signature algorithm object
     * @type ASN1
     */
    PKCS10Generator.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 {
    		throw new GPError("PKCS10Generator", GPError.INVALID_MECH, this.signatureAlgorithm, "Invalid algorithm");
    	}

    	return t;
    }

    /**
     * Generates the certificate.
     *
     * @return the generated certificate
     * @type ASN1
     */
    PKCS10Generator.prototype.generateCertificationRequest = function(privateKey) {
    	var request = new ASN1("certificationRequest", ASN1.SEQUENCE);

    	var tbs = this.getTbsRequest();
    	request.add(tbs);
    	request.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);
    	request.add(signatureValue);

    	return request;
    }

    function PKCS10GeneratorTest() {

    	var crypto = new Crypto();

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

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

    	crypto.generateKeyPair(Crypto.RSA, reqPublicKey, reqPrivateKey);

    	var x = new PKCS10Generator(crypto);

    	x.reset();
    	x.setSignatureAlgorithm(Crypto.RSA_SHA256);

    	var subject = [{C:"UT"}, {O:"Utopia CA"}, {OU:"ACME Corporation"}, {CN:"Joe Doe"} ];

    	x.setSubject(subject);

    	x.setPublicKey(reqPublicKey);

    	x.addKeyUsageExtension(	PKIXCommon.digitalSignature |
    							PKIXCommon.keyCertSign |
    							PKIXCommon.cRLSign );

    	var req = x.generateCertificationRequest(reqPrivateKey);
    	var fn = GPSystem.mapFilename("cert.csr", GPSystem.USR);
    	PKIXCommon.writeFileToDisk(fn, req.getBytes());

    	print(req);

    	return req;
    }

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Documentation generated by JSDoc on Wed Jan 14 16:42:14 2026