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DSS CAdES contains the code for the creation and validation of CAdES signatures.
There is a newer version: 6.2.RC1
/**
 * DSS - Digital Signature Services
 * Copyright (C) 2015 European Commission, provided under the CEF programme
 * 
 * This file is part of the "DSS - Digital Signature Services" project.
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package eu.europa.esig.dss.cades;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

/**
 * SignedAssertions ::= SEQUENCE OF SignedAssertion
 */
public class SignedAssertions extends ASN1Object {

    /** List of signed assertions */
    private final List assertions;

    /**
     * Parses the object and return {@code SignedAssertions},
     * null if the object is of another type
     *
     * @param obj object representing {@link SignedAssertions} to parse
     * @return {@link SignedAssertions}
     */
    public static SignedAssertions getInstance(Object obj) {
        if (obj instanceof SignedAssertions) {
            return (SignedAssertions) obj;
        } else if (obj != null) {
            return new SignedAssertions(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    /**
     * Creates the {@code SignedAssertions} from a list of {@code SignedAssertion}s
     *
     * @param assertions a list of {@link SignedAssertion}s
     */
    public SignedAssertions(List assertions) {
        this.assertions = assertions;
    }

    /**
     * Local constructor from {@code ASN1Sequence}
     *
     * @param seq {@link ASN1Sequence}
     */
    @SuppressWarnings("rawtypes")
    private SignedAssertions(ASN1Sequence seq) {
        assertions = new ArrayList<>(seq.size());
        for (Enumeration e = seq.getObjects(); e.hasMoreElements();) {
            assertions.add(SignedAssertion.getInstance(e.nextElement()));
        }
    }

    @Override
    public ASN1Primitive toASN1Primitive() {

        ASN1EncodableVector v = new ASN1EncodableVector();
        for (SignedAssertion sa : assertions) {
            v.add(sa);
        }

        return new DERSequence(v);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        for (SignedAssertion sa : assertions) {
            sb.append(sa.toString()).append("\n");
        }

        return sb.toString();
    }

    /**
     * Returns a list of {@code SignedAssertion}s
     *
     * @return a list of {@link SignedAssertion}s
     */
    public List getAssertions() {
        return assertions;
    }

}