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The XAdES4j library is an high-level, configurable and extensible Java implementation of XML Advanced
Electronic Signatures (XAdES 1.3.2 and 1.4.1). It enables producing, verifying and extending signatures in the
main XAdES forms: XAdES-BES, XAdES-EPES, XAdES-T and XAdES-C. Also, extended forms are supported through the
enrichment of an existing signature.
/*
* XAdES4j - A Java library for generation and verification of XAdES signatures.
* Copyright (C) 2010 Luis Goncalves.
*
* XAdES4j is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or any later version.
*
* XAdES4j 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License along
* with XAdES4j. If not, see .
*/
package xades4j.production;
import com.google.inject.Inject;
import java.io.IOException;
import java.security.MessageDigest;
import xades4j.properties.SignaturePolicyIdentifierProperty;
import xades4j.UnsupportedAlgorithmException;
import xades4j.properties.data.PropertyDataObject;
import xades4j.properties.data.SignaturePolicyData;
import xades4j.providers.AlgorithmsProviderEx;
import xades4j.providers.MessageDigestEngineProvider;
import xades4j.utils.MessageDigestUtils;
/**
*
* @author Luís
*/
class DataGenSigPolicy implements PropertyDataObjectGenerator
{
private final MessageDigestEngineProvider messageDigestProvider;
private final AlgorithmsProviderEx algorithmsProvider;
@Inject
public DataGenSigPolicy(
MessageDigestEngineProvider messageDigestProvider,
AlgorithmsProviderEx algorithmsProvider)
{
this.messageDigestProvider = messageDigestProvider;
this.algorithmsProvider = algorithmsProvider;
}
@Override
public PropertyDataObject generatePropertyData(
SignaturePolicyIdentifierProperty prop,
PropertiesDataGenerationContext ctx) throws PropertyDataGenerationException
{
try
{
// Digest the policy document.
String digestAlgUri = this.algorithmsProvider.getDigestAlgorithmForReferenceProperties();
MessageDigest md = this.messageDigestProvider.getEngine(digestAlgUri);
byte[] policyDigest = MessageDigestUtils.digestStream(md, prop.getPolicyDocumentStream());
return new SignaturePolicyData(
prop.getIdentifier(),
digestAlgUri,
policyDigest,
prop.getLocationUrl());
} catch (IOException ex)
{
throw new PropertyDataGenerationException(prop, "Cannot digest signature policy", ex);
} catch (UnsupportedAlgorithmException ex)
{
throw new PropertyDataGenerationException(prop, ex.getMessage(), ex);
}
}
}