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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.voms;

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

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.x509.Attribute;
import org.bouncycastle.asn1.x509.IetfAttrSyntax;
import org.bouncycastle.cert.X509AttributeCertificateHolder;

/**
 * Representation of the authorization information (VO, server address
 * and list of Fully Qualified Attribute Names, or FQANs) contained in
 * a VOMS attribute certificate.
 */
public class VOMSAttribute
{

    /**
     * The ASN.1 object identifier for VOMS attributes
     */
    public static final String VOMS_ATTR_OID = "1.3.6.1.4.1.8005.100.100.4";
    private X509AttributeCertificateHolder myAC;
    private String myHostPort;
    private String myVo;
    private List myStringList = new ArrayList();
    private List myFQANs = new ArrayList();

    /**
     * Parses the contents of an attribute certificate.

     * NOTE: Cryptographic signatures, time stamps etc. will not be checked.
     *
     * @param ac the attribute certificate to parse for VOMS attributes
     */
    public VOMSAttribute(X509AttributeCertificateHolder ac)
    {
        if (ac == null) 
        {
            throw new IllegalArgumentException("VOMSAttribute: AttributeCertificate is NULL");
        }

        myAC = ac;

        Attribute[] l = ac.getAttributes(new ASN1ObjectIdentifier(VOMS_ATTR_OID));

        if (l == null) 
        {
            return;
        }

        try 
        {
            for (int i = 0; i != l.length; i++) 
            {
                IetfAttrSyntax attr = IetfAttrSyntax.getInstance(l[i].getAttributeValues()[0]);

                // policyAuthority is on the format /:
                String url = ((DERIA5String)attr.getPolicyAuthority().getNames()[0].getName()).getString();
                int idx = url.indexOf("://");

                if ((idx < 0) || (idx == (url.length() - 1)))
                {
                    throw new IllegalArgumentException("Bad encoding of VOMS policyAuthority : [" + url + "]");
                }

                myVo = url.substring(0, idx);
                myHostPort = url.substring(idx + 3);

                if (attr.getValueType() != IetfAttrSyntax.VALUE_OCTETS)
                {
                    throw new IllegalArgumentException(
                        "VOMS attribute values are not encoded as octet strings, policyAuthority = " + url);
                }

                ASN1OctetString[]   values = (ASN1OctetString[])attr.getValues();
                for (int j = 0; j != values.length; j++)        
                {
                    String fqan = new String(values[j].getOctets());
                    FQAN f = new FQAN(fqan);

                    if (!myStringList.contains(fqan) && fqan.startsWith("/" + myVo + "/"))
               {
                        myStringList.add(fqan);
                        myFQANs.add(f);
                    }
                }
            }
        }
        catch (IllegalArgumentException ie) 
        {
            throw ie;
        }
        catch (Exception e) 
        {
            throw new IllegalArgumentException("Badly encoded VOMS extension in AC issued by " +
                ac.getIssuer());
        }
    }

    /**
     * @return The AttributeCertificate containing the VOMS information
     */
    public X509AttributeCertificateHolder getAC()
    {
        return myAC;
    }

    /**
     * @return List of String of the VOMS fully qualified
     * attributes names (FQANs):

     * /vo[/group[/group2...]][/Role=[role]][/Capability=capability]
     */
    public List getFullyQualifiedAttributes()
    {
        return myStringList;
    }

    /**
     * @return List of FQAN of the VOMS fully qualified
     * attributes names (FQANs)
     */
    public List getListOfFQAN()
    {
        return myFQANs;
    }

    /**
     * Returns the address of the issuing VOMS server, on the form <host>:<port>
     * @return String
     */
    public String getHostPort()
    {
        return myHostPort;
    }

    /**
     * Returns the VO name
     * @return
     */
    public String getVO()
    {
        return myVo;
    }

    public String toString()
    {
        return "VO      :" + myVo + "\n" + "HostPort:" + myHostPort + "\n" + "FQANs   :" + myFQANs;
    }

    /**
     * Inner class providing a container of the group,role,capability
     * information triplet in an FQAN.
     */
    public class FQAN
    {
        String fqan;
        String group;
        String role;
        String capability;

        public FQAN(String fqan)
        {
            this.fqan = fqan;
        }

        public FQAN(String group, String role, String capability)
        {
            this.group = group;
            this.role = role;
            this.capability = capability;
        }

        public String getFQAN()
        {
            if (fqan != null)
            {
                return fqan;
            }

            fqan = group + "/Role=" + ((role != null) ? role : "") +
                ((capability != null) ? ("/Capability=" + capability) : "");

            return fqan;
        }

        protected void split()
        {
            int len = fqan.length();
            int i = fqan.indexOf("/Role=");

            if (i < 0)
            {
                return;
            }

            group = fqan.substring(0, i);

            int j = fqan.indexOf("/Capability=", i + 6);
            String s = (j < 0) ? fqan.substring(i + 6) : fqan.substring(i + 6, j);
            role = (s.length() == 0) ? null : s;
            s = (j < 0) ? null : fqan.substring(j + 12);
            capability = ((s == null) || (s.length() == 0)) ? null : s;
        }

        public String getGroup()
        {
            if ((group == null) && (fqan != null))
            {
                split();
            }

            return group;
        }

        public String getRole()
        {
            if ((group == null) && (fqan != null))
            {
                split();
            }

            return role;
        }

        public String getCapability()   
        {
            if ((group == null) && (fqan != null))
            {
                split();
            }

            return capability;
        }

        public String toString()
        {
            return getFQAN();
        }
    }
}