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+/*
+* Copyright 2008 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* 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 at.gv.egiz.xmldsig;
+
+import iaik.security.ecc.interfaces.ECDSAParams;
+import iaik.security.ecc.interfaces.ECDSAPublicKey;
+import iaik.security.ecc.math.ecgroup.Coordinate;
+import iaik.security.ecc.math.ecgroup.ECPoint;
+import iaik.security.ecc.math.ecgroup.EllipticCurve;
+import iaik.security.ecc.math.field.BinaryField;
+import iaik.security.ecc.math.field.Field;
+import iaik.security.ecc.math.field.FieldElement;
+import iaik.security.ecc.math.field.PrimeField;
+
+import java.math.BigInteger;
+import java.security.InvalidKeyException;
+import java.security.PublicKey;
+import java.security.interfaces.DSAParams;
+import java.security.interfaces.DSAPublicKey;
+import java.security.interfaces.RSAPublicKey;
+
+import javax.xml.bind.JAXBElement;
+
+import org.w3._2000._09.xmldsig_.DSAKeyValueType;
+import org.w3._2000._09.xmldsig_.RSAKeyValueType;
+import org.w3._2001._04.xmldsig_more_.BasePointParamsType;
+import org.w3._2001._04.xmldsig_more_.CharTwoFieldElemType;
+import org.w3._2001._04.xmldsig_more_.CurveParamsType;
+import org.w3._2001._04.xmldsig_more_.DomainParamsType;
+import org.w3._2001._04.xmldsig_more_.ECDSAKeyValueType;
+import org.w3._2001._04.xmldsig_more_.ECPointType;
+import org.w3._2001._04.xmldsig_more_.ExplicitParamsType;
+import org.w3._2001._04.xmldsig_more_.FieldElemType;
+import org.w3._2001._04.xmldsig_more_.FieldParamsType;
+import org.w3._2001._04.xmldsig_more_.PnBFieldParamsType;
+import org.w3._2001._04.xmldsig_more_.PrimeFieldElemType;
+import org.w3._2001._04.xmldsig_more_.PrimeFieldParamsType;
+import org.w3._2001._04.xmldsig_more_.TnBFieldParamsType;
+import org.w3._2001._04.xmldsig_more_.DomainParamsType.NamedCurve;
+
+public class KeyValueFactory {
+
+ private static byte[] bigInteger2byteArray(BigInteger bigPositiveInt) {
+ if (bigPositiveInt == null)
+ throw new NullPointerException("Argument 'bigPositiveInt' must not be null");
+ if (bigPositiveInt.signum() != 1)
+ throw new IllegalArgumentException("Argument 'bigPositiveInt' must not be negative");
+
+ byte[] byteRepresentation = bigPositiveInt.toByteArray();
+ if (byteRepresentation[0] == 0) {
+ byte[] oldByteRepresentation = byteRepresentation;
+ byteRepresentation = new byte[oldByteRepresentation.length - 1];
+ System.arraycopy(oldByteRepresentation, 1, byteRepresentation, 0, oldByteRepresentation.length - 1);
+ }
+ return byteRepresentation;
+ }
+
+ org.w3._2001._04.xmldsig_more_.ObjectFactory ecFactory = new org.w3._2001._04.xmldsig_more_.ObjectFactory();
+
+ org.w3._2000._09.xmldsig_.ObjectFactory dsFactory = new org.w3._2000._09.xmldsig_.ObjectFactory();
+
+ public JAXBElement<?> createKeyValue(PublicKey publicKey) throws KeyTypeNotSupportedException {
+
+ if (publicKey instanceof RSAPublicKey) {
+ RSAKeyValueType keyValueType = createRSAKeyValueType((RSAPublicKey) publicKey);
+ return dsFactory.createRSAKeyValue(keyValueType);
+ } else if (publicKey instanceof DSAPublicKey) {
+ DSAKeyValueType keyValueType = createKeyValueType((DSAPublicKey) publicKey);
+ return dsFactory.createDSAKeyValue(keyValueType);
+ } else if (publicKey instanceof ECDSAPublicKey) {
+ ECDSAKeyValueType keyValueType = createKeyValueType((ECDSAPublicKey) publicKey);
+ return ecFactory.createECDSAKeyValue(keyValueType);
+ } else if ("EC".equals(publicKey.getAlgorithm())) {
+ byte[] encoded = publicKey.getEncoded();
+ try {
+ iaik.security.ecc.ecdsa.ECPublicKey key = new iaik.security.ecc.ecdsa.ECPublicKey(encoded);
+ ECDSAKeyValueType keyValueType = createKeyValueType(key);
+ return ecFactory.createECDSAKeyValue(keyValueType);
+ } catch (InvalidKeyException e) {
+ throw new KeyTypeNotSupportedException("Public key of type "
+ + publicKey.getAlgorithm() + " (" + publicKey.getClass()
+ + ") not supported.");
+ }
+ } else {
+ throw new KeyTypeNotSupportedException("Public key of type "
+ + publicKey.getAlgorithm() + " (" + publicKey.getClass()
+ + ") not supported.");
+ }
+
+ }
+
+ public RSAKeyValueType createRSAKeyValueType(RSAPublicKey publicKey) {
+
+ RSAKeyValueType keyValueType = dsFactory.createRSAKeyValueType();
+ keyValueType.setExponent(bigInteger2byteArray(publicKey.getPublicExponent()));
+ keyValueType.setModulus(bigInteger2byteArray(publicKey.getModulus()));
+
+ return keyValueType;
+ }
+
+ public DSAKeyValueType createKeyValueType(DSAPublicKey publicKey) {
+
+ DSAKeyValueType keyValueType = dsFactory.createDSAKeyValueType();
+
+ if (publicKey.getParams() != null) {
+ // P, Q, G
+ DSAParams params = publicKey.getParams();
+ if (params.getP() != null && params.getQ() != null) {
+ keyValueType.setP(bigInteger2byteArray(params.getP()));
+ keyValueType.setQ(bigInteger2byteArray(params.getQ()));
+ }
+ if (params.getG() != null) {
+ keyValueType.setG(bigInteger2byteArray(params.getG()));
+ }
+ }
+ //
+ keyValueType.setY(bigInteger2byteArray(publicKey.getY()));
+
+ return keyValueType;
+ }
+
+ public ECDSAKeyValueType createKeyValueType(ECDSAPublicKey publicKey) throws KeyTypeNotSupportedException {
+
+ ECDSAKeyValueType keyValueType = ecFactory.createECDSAKeyValueType();
+
+ ECDSAParams params = publicKey.getParameter();
+ if (params != null) {
+ keyValueType.setDomainParameters(createDomainParamsType(params));
+ }
+
+ if (!publicKey.getW().isInfinity()) {
+ keyValueType.setPublicKey(createPointType(publicKey.getW()));
+ }
+
+ return keyValueType;
+ }
+
+ public ECPointType createPointType(ECPoint point) throws KeyTypeNotSupportedException {
+ ECPointType pointType = ecFactory.createECPointType();
+ Coordinate affine = point.getCoordinates().toAffine();
+ pointType.setX(createFieldElemType(affine.getX()));
+ pointType.setY(createFieldElemType(affine.getY()));
+ return pointType;
+ }
+
+ public FieldElemType createFieldElemType(FieldElement fieldElement) throws KeyTypeNotSupportedException {
+ int fieldId = fieldElement.getField().getFieldId();
+ if (fieldId == PrimeField.PRIME_FIELD_ID) {
+ PrimeFieldElemType fieldElemType = ecFactory.createPrimeFieldElemType();
+ fieldElemType.setValue(fieldElement.toBigInt());
+ return fieldElemType;
+ } else if (fieldId == BinaryField.BINARY_FIELD_ID) {
+ CharTwoFieldElemType fieldElemType = ecFactory.createCharTwoFieldElemType();
+ fieldElemType.setValue(fieldElement.toByteArray());
+ return fieldElemType;
+ } else {
+ throw new KeyTypeNotSupportedException("Field element of type " + fieldId + " not supported.");
+ }
+ }
+
+ public FieldParamsType createFieldParamsType(Field field) throws KeyTypeNotSupportedException {
+
+ if (field.getFieldId() == PrimeField.PRIME_FIELD_ID) {
+ // PrimeFieldParamsType
+ PrimeFieldParamsType primeFieldParamsType = ecFactory.createPrimeFieldParamsType();
+ primeFieldParamsType.setP(field.getSize());
+ return primeFieldParamsType;
+ } else if (field.getFieldId() == BinaryField.BINARY_FIELD_ID && field instanceof BinaryField) {
+ // CharTwoFieldParamsType
+
+ BinaryField binaryField = (BinaryField) field;
+ int[] irreduciblePolynomial = binaryField.getIrreduciblePolynomial();
+
+ // The irreducible polynomial as a BinaryFieldValue
+ FieldElement irreducible = binaryField.newElement(irreduciblePolynomial);
+
+ int order = binaryField.getOrder();
+ int[] coeffPositions = new int[3];
+
+ // Get coefficients of irreducible polynomial
+ int coeffCount = 2;
+ for (int i = 1; i < order -1; i++) {
+ if (irreducible.testBit(i)) {
+ coeffPositions[coeffCount - 2] = i;
+ coeffCount++;
+ if (coeffCount == 5)
+ break;
+ }
+ }
+ // detect if trinomial or pentanomial base is present...
+ switch (coeffCount) {
+ case 3:
+ // trinomial base
+ TnBFieldParamsType tnBFieldParamsType = ecFactory.createTnBFieldParamsType();
+ tnBFieldParamsType.setM(BigInteger.valueOf(binaryField.getOrder()));
+ tnBFieldParamsType.setK(BigInteger.valueOf(coeffPositions[0]));
+ return tnBFieldParamsType;
+
+ case 5:
+ // pentanomial base
+ PnBFieldParamsType pnBFieldParamsType = ecFactory.createPnBFieldParamsType();
+ pnBFieldParamsType.setM(BigInteger.valueOf(binaryField.getOrder()));
+ pnBFieldParamsType.setK1(BigInteger.valueOf(coeffPositions[0]));
+ pnBFieldParamsType.setK2(BigInteger.valueOf(coeffPositions[1]));
+ pnBFieldParamsType.setK3(BigInteger.valueOf(coeffPositions[2]));
+ return pnBFieldParamsType;
+
+ default:
+ throw new KeyTypeNotSupportedException("Only trinomial and pentanomial base is supported.");
+ }
+
+ } else {
+ throw new KeyTypeNotSupportedException("Field element of type " + field.getFieldId() + " not supported.");
+ }
+
+ }
+
+ public DomainParamsType createDomainParamsType(ECDSAParams params) throws KeyTypeNotSupportedException {
+
+ DomainParamsType domainParamsType = ecFactory.createDomainParamsType();
+ EllipticCurve curve = params.getG().getCurve();
+
+ String oid = params.getOID();
+ if (oid != null) {
+ // NamedCurve
+ NamedCurve namedCurve = ecFactory.createDomainParamsTypeNamedCurve();
+ namedCurve.setURN("urn:oid:" + oid);
+ domainParamsType.setNamedCurve(namedCurve);
+ } else {
+ // Explicit parameters
+ ExplicitParamsType explicitParamsType = ecFactory.createExplicitParamsType();
+ explicitParamsType.setFieldParams(createFieldParamsType(curve.getField()));
+
+ CurveParamsType curveParamsType = ecFactory.createCurveParamsType();
+
+ // curve coefficients
+ curveParamsType.setA(createFieldElemType(curve.getA()));
+ curveParamsType.setB(createFieldElemType(curve.getB()));
+
+ // seed
+ if (params.getS() != null) {
+ curveParamsType.setSeed(bigInteger2byteArray(params.getS()));
+ }
+ explicitParamsType.setCurveParams(curveParamsType);
+
+
+ // BasePoint parameters
+ BasePointParamsType basePointParamsType = ecFactory.createBasePointParamsType();
+ if (!params.getG().isInfinity()) {
+ basePointParamsType.setBasePoint(createPointType(params.getG()));
+ }
+ basePointParamsType.setOrder(params.getR());
+ if(params.getK() != null) {
+ basePointParamsType.setCofactor(params.getK());
+ }
+ explicitParamsType.setBasePointParams(basePointParamsType);
+
+ domainParamsType.setExplicitParams(explicitParamsType);
+ }
+
+ return domainParamsType;
+
+ }
+
+}