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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.
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package org.bouncycastle.asn1.pkcs;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * a PKCS#7 signer info object.
 */
public class SignerInfo
    extends ASN1Object
{
    private ASN1Integer              version;
    private IssuerAndSerialNumber   issuerAndSerialNumber;
    private AlgorithmIdentifier     digAlgorithm;
    private ASN1Set                 authenticatedAttributes;
    private AlgorithmIdentifier     digEncryptionAlgorithm;
    private ASN1OctetString         encryptedDigest;
    private ASN1Set                 unauthenticatedAttributes;

    public static SignerInfo getInstance(
        Object  o)
    {
        if (o instanceof SignerInfo)
        {
            return (SignerInfo)o;
        }
        else if (o instanceof ASN1Sequence)
        {
            return new SignerInfo((ASN1Sequence)o);
        }

        throw new IllegalArgumentException("unknown object in factory: " + o.getClass().getName());
    }

    public SignerInfo(
        ASN1Integer              version,
        IssuerAndSerialNumber   issuerAndSerialNumber,
        AlgorithmIdentifier     digAlgorithm,
        ASN1Set                 authenticatedAttributes,
        AlgorithmIdentifier     digEncryptionAlgorithm,
        ASN1OctetString         encryptedDigest,
        ASN1Set                 unauthenticatedAttributes)
    {
        this.version = version;
        this.issuerAndSerialNumber = issuerAndSerialNumber;
        this.digAlgorithm = digAlgorithm;
        this.authenticatedAttributes = authenticatedAttributes;
        this.digEncryptionAlgorithm = digEncryptionAlgorithm;
        this.encryptedDigest = encryptedDigest;
        this.unauthenticatedAttributes = unauthenticatedAttributes;
    }

    public SignerInfo(
        ASN1Sequence seq)
    {
        Enumeration     e = seq.getObjects();

        version = (ASN1Integer)e.nextElement();
        issuerAndSerialNumber = IssuerAndSerialNumber.getInstance(e.nextElement());
        digAlgorithm = AlgorithmIdentifier.getInstance(e.nextElement());

        Object obj = e.nextElement();

        if (obj instanceof ASN1TaggedObject)
        {
            authenticatedAttributes = ASN1Set.getInstance((ASN1TaggedObject)obj, false);

            digEncryptionAlgorithm = AlgorithmIdentifier.getInstance(e.nextElement());
        }
        else
        {
            authenticatedAttributes = null;
            digEncryptionAlgorithm = AlgorithmIdentifier.getInstance(obj);
        }

        encryptedDigest = DEROctetString.getInstance(e.nextElement());

        if (e.hasMoreElements())
        {
            unauthenticatedAttributes = ASN1Set.getInstance((ASN1TaggedObject)e.nextElement(), false);
        }
        else
        {
            unauthenticatedAttributes = null;
        }
    }

    public ASN1Integer getVersion()
    {
        return version;
    }

    public IssuerAndSerialNumber getIssuerAndSerialNumber()
    {
        return issuerAndSerialNumber;
    }

    public ASN1Set getAuthenticatedAttributes()
    {
        return authenticatedAttributes;
    }

    public AlgorithmIdentifier getDigestAlgorithm()
    {
        return digAlgorithm;
    }

    public ASN1OctetString getEncryptedDigest()
    {
        return encryptedDigest;
    }

    public AlgorithmIdentifier getDigestEncryptionAlgorithm()
    {
        return digEncryptionAlgorithm;
    }

    public ASN1Set getUnauthenticatedAttributes()
    {
        return unauthenticatedAttributes;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     *      *  SignerInfo ::= SEQUENCE {
     *      version Version,
     *      issuerAndSerialNumber IssuerAndSerialNumber,
     *      digestAlgorithm DigestAlgorithmIdentifier,
     *      authenticatedAttributes [0] IMPLICIT Attributes OPTIONAL,
     *      digestEncryptionAlgorithm DigestEncryptionAlgorithmIdentifier,
     *      encryptedDigest EncryptedDigest,
     *      unauthenticatedAttributes [1] IMPLICIT Attributes OPTIONAL
     *  }
     *
     *  EncryptedDigest ::= OCTET STRING
     *
     *  DigestAlgorithmIdentifier ::= AlgorithmIdentifier
     *
     *  DigestEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(7);

        v.add(version);
        v.add(issuerAndSerialNumber);
        v.add(digAlgorithm);

        if (authenticatedAttributes != null)
        {
            v.add(new DERTaggedObject(false, 0, authenticatedAttributes));
        }

        v.add(digEncryptionAlgorithm);
        v.add(encryptedDigest);

        if (unauthenticatedAttributes != null)
        {
            v.add(new DERTaggedObject(false, 1, unauthenticatedAttributes));
        }

        return new DERSequence(v);
    }
}