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Apache XML Security for Java supports XML-Signature Syntax and Processing,
W3C Recommendation 12 February 2002, and XML Encryption Syntax and
Processing, W3C Recommendation 10 December 2002. As of version 1.4,
the library supports the standard Java API JSR-105: XML Digital Signature APIs.
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.xml.security.algorithms.implementations;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.interfaces.DSAKey;
import java.security.spec.AlgorithmParameterSpec;
import org.apache.xml.security.algorithms.JCEMapper;
import org.apache.xml.security.algorithms.SignatureAlgorithmSpi;
import org.apache.xml.security.signature.XMLSignature;
import org.apache.xml.security.signature.XMLSignatureException;
import org.apache.xml.security.utils.Base64;
import org.apache.xml.security.utils.JavaUtils;
public class SignatureDSA extends SignatureAlgorithmSpi {
private static org.slf4j.Logger log =
org.slf4j.LoggerFactory.getLogger(SignatureDSA.class);
/** Field algorithm */
private Signature signatureAlgorithm = null;
/** size of Q */
private int size;
/**
* Method engineGetURI
*
* @inheritDoc
*/
protected String engineGetURI() {
return XMLSignature.ALGO_ID_SIGNATURE_DSA;
}
/**
* Constructor SignatureDSA
*
* @throws XMLSignatureException
*/
public SignatureDSA() throws XMLSignatureException {
String algorithmID = JCEMapper.translateURItoJCEID(engineGetURI());
if (log.isDebugEnabled()) {
log.debug("Created SignatureDSA using " + algorithmID);
}
String provider = JCEMapper.getProviderId();
try {
if (provider == null) {
this.signatureAlgorithm = Signature.getInstance(algorithmID);
} else {
this.signatureAlgorithm =
Signature.getInstance(algorithmID, provider);
}
} catch (java.security.NoSuchAlgorithmException ex) {
Object[] exArgs = { algorithmID, ex.getLocalizedMessage() };
throw new XMLSignatureException("algorithms.NoSuchAlgorithm", exArgs);
} catch (java.security.NoSuchProviderException ex) {
Object[] exArgs = { algorithmID, ex.getLocalizedMessage() };
throw new XMLSignatureException("algorithms.NoSuchAlgorithm", exArgs);
}
}
/**
* @inheritDoc
*/
protected void engineSetParameter(AlgorithmParameterSpec params)
throws XMLSignatureException {
try {
this.signatureAlgorithm.setParameter(params);
} catch (InvalidAlgorithmParameterException ex) {
throw new XMLSignatureException(ex);
}
}
/**
* @inheritDoc
*/
protected boolean engineVerify(byte[] signature)
throws XMLSignatureException {
try {
if (log.isDebugEnabled()) {
log.debug("Called DSA.verify() on " + Base64.encode(signature));
}
byte[] jcebytes = JavaUtils.convertDsaXMLDSIGtoASN1(signature,
size/8);
return this.signatureAlgorithm.verify(jcebytes);
} catch (SignatureException ex) {
throw new XMLSignatureException(ex);
} catch (IOException ex) {
throw new XMLSignatureException(ex);
}
}
/**
* @inheritDoc
*/
protected void engineInitVerify(Key publicKey) throws XMLSignatureException {
if (!(publicKey instanceof PublicKey)) {
String supplied = null;
if (publicKey != null) {
supplied = publicKey.getClass().getName();
}
String needed = PublicKey.class.getName();
Object exArgs[] = { supplied, needed };
throw new XMLSignatureException("algorithms.WrongKeyForThisOperation", exArgs);
}
try {
this.signatureAlgorithm.initVerify((PublicKey) publicKey);
} catch (InvalidKeyException ex) {
// reinstantiate Signature object to work around bug in JDK
// see: http://bugs.sun.com/view_bug.do?bug_id=4953555
Signature sig = this.signatureAlgorithm;
try {
this.signatureAlgorithm = Signature.getInstance(signatureAlgorithm.getAlgorithm());
} catch (Exception e) {
// this shouldn't occur, but if it does, restore previous
// Signature
if (log.isDebugEnabled()) {
log.debug("Exception when reinstantiating Signature:" + e);
}
this.signatureAlgorithm = sig;
}
throw new XMLSignatureException(ex);
}
size = ((DSAKey)publicKey).getParams().getQ().bitLength();
}
/**
* @inheritDoc
*/
protected byte[] engineSign() throws XMLSignatureException {
try {
byte jcebytes[] = this.signatureAlgorithm.sign();
return JavaUtils.convertDsaASN1toXMLDSIG(jcebytes, size/8);
} catch (IOException ex) {
throw new XMLSignatureException(ex);
} catch (SignatureException ex) {
throw new XMLSignatureException(ex);
}
}
/**
* @inheritDoc
*/
protected void engineInitSign(Key privateKey, SecureRandom secureRandom)
throws XMLSignatureException {
if (!(privateKey instanceof PrivateKey)) {
String supplied = null;
if (privateKey != null) {
supplied = privateKey.getClass().getName();
}
String needed = PrivateKey.class.getName();
Object exArgs[] = { supplied, needed };
throw new XMLSignatureException("algorithms.WrongKeyForThisOperation", exArgs);
}
try {
if (secureRandom == null) {
this.signatureAlgorithm.initSign((PrivateKey) privateKey);
} else {
this.signatureAlgorithm.initSign((PrivateKey) privateKey, secureRandom);
}
} catch (InvalidKeyException ex) {
throw new XMLSignatureException(ex);
}
size = ((DSAKey)privateKey).getParams().getQ().bitLength();
}
/**
* @inheritDoc
*/
protected void engineInitSign(Key privateKey) throws XMLSignatureException {
engineInitSign(privateKey, (SecureRandom)null);
}
/**
* @inheritDoc
*/
protected void engineUpdate(byte[] input) throws XMLSignatureException {
try {
this.signatureAlgorithm.update(input);
} catch (SignatureException ex) {
throw new XMLSignatureException(ex);
}
}
/**
* @inheritDoc
*/
protected void engineUpdate(byte input) throws XMLSignatureException {
try {
this.signatureAlgorithm.update(input);
} catch (SignatureException ex) {
throw new XMLSignatureException(ex);
}
}
/**
* @inheritDoc
*/
protected void engineUpdate(byte buf[], int offset, int len) throws XMLSignatureException {
try {
this.signatureAlgorithm.update(buf, offset, len);
} catch (SignatureException ex) {
throw new XMLSignatureException(ex);
}
}
/**
* Method engineGetJCEAlgorithmString
*
* @inheritDoc
*/
protected String engineGetJCEAlgorithmString() {
return this.signatureAlgorithm.getAlgorithm();
}
/**
* Method engineGetJCEProviderName
*
* @inheritDoc
*/
protected String engineGetJCEProviderName() {
return this.signatureAlgorithm.getProvider().getName();
}
/**
* Method engineSetHMACOutputLength
*
* @param HMACOutputLength
* @throws XMLSignatureException
*/
protected void engineSetHMACOutputLength(int HMACOutputLength) throws XMLSignatureException {
throw new XMLSignatureException("algorithms.HMACOutputLengthOnlyForHMAC");
}
/**
* Method engineInitSign
*
* @param signingKey
* @param algorithmParameterSpec
* @throws XMLSignatureException
*/
protected void engineInitSign(
Key signingKey, AlgorithmParameterSpec algorithmParameterSpec
) throws XMLSignatureException {
throw new XMLSignatureException("algorithms.CannotUseAlgorithmParameterSpecOnDSA");
}
public static class SHA256 extends SignatureDSA {
public SHA256() throws XMLSignatureException {
super();
}
public String engineGetURI() {
return XMLSignature.ALGO_ID_SIGNATURE_DSA_SHA256;
}
}
}