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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.

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/*
 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2012 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.providers.impl;

import java.util.HashMap;
import java.util.Map;
import org.apache.xml.security.algorithms.MessageDigestAlgorithm;
import org.apache.xml.security.signature.XMLSignature;
import xades4j.algorithms.Algorithm;
import xades4j.algorithms.GenericAlgorithm;
import xades4j.UnsupportedAlgorithmException;
import xades4j.algorithms.CanonicalXMLWithoutComments;
import xades4j.providers.AlgorithmsProviderEx;

/**
 * The default implementation of {@link AlgorithmsProviderEx}. The defaults
 * are:
 * 
 *  Signature: RSA(RSA_SHA256), DSA(DSA_SHA1)
 *  Canonicalization: Canonical XML 1.0 without comments
 *  Digest: SHA256 (data objs and refs properties); SHA1 (time-stamps)
 * 
 * @author Luís
 */
public class DefaultAlgorithmsProviderEx implements AlgorithmsProviderEx
{
    private static final Map signatureAlgsMaps;

    static
    {
        signatureAlgsMaps = new HashMap(2);
        signatureAlgsMaps.put("DSA", new GenericAlgorithm(XMLSignature.ALGO_ID_SIGNATURE_DSA));
        signatureAlgsMaps.put("RSA", new GenericAlgorithm(XMLSignature.ALGO_ID_SIGNATURE_RSA_SHA256));
    }

    @Override
    public Algorithm getSignatureAlgorithm(String keyAlgorithmName) throws UnsupportedAlgorithmException
    {
        Algorithm sigAlg = signatureAlgsMaps.get(keyAlgorithmName);

        if (null == sigAlg)
        {
            throw new UnsupportedAlgorithmException("Signature algorithm not supported by the provider", keyAlgorithmName);
        }

        return sigAlg;
    }

    @Override
    public Algorithm getCanonicalizationAlgorithmForSignature()
    {
        return new CanonicalXMLWithoutComments();
    }

    @Override
    public Algorithm getCanonicalizationAlgorithmForTimeStampProperties()
    {
        return new CanonicalXMLWithoutComments();
    }

    @Override
    public String getDigestAlgorithmForDataObjsReferences()
    {
        return MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA256;
    }

    @Override
    public String getDigestAlgorithmForReferenceProperties()
    {
        return MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA256;
    }

    @Override
    public String getDigestAlgorithmForTimeStampProperties()
    {
        return MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA1;
    }
}