X509CertificateHolder clientCertHolder = new X509CertificateHolder(clientCert.getEncoded());

if (h.match(clientCertHolder))
{
	if (h.getEntityNames() != null)
	{
		System.out.println(h.getEntityNames().length + " entity names found");
	}
	if (h.getIssuer() != null)
	{
		System.out.println(h.getIssuer().length + " issuer names found, serial number " + h.getSerialNumber());
	}
	System.out.println("Matches original client x509 cert");
}
else
{
	System.out.println("does not match clientCert!");
}

// Issuer

AttributeCertificateIssuer issuer = att.getIssuer();
X509CertificateHolder caCertHolder = new X509CertificateHolder(caCert.getEncoded());
if (issuer.match(caCertHolder))
{
	if (issuer.getNames() != null)
	{
		System.out.println(issuer.getNames().length + " entity names found");
	}
	System.out.println("Matches original ca x509 cert");
}
else
{
	System.out.println("does not match caCert!");
}

// Dates
System.out.println("valid not before: " + att.getNotBefore());
System.out.println("valid not before: " + att.getNotAfter());

// check the dates

if (att.isValidOn(new Date()))
{
	System.out.println("valid now");
}
else
{
	System.out.println("invalid now");
}

// verify

if (att.isSignatureValid(new JcaContentVerifierProviderBuilder().setProvider("BC").build(caPubKey)))
{
	System.out.println("signature valid now");
}
else
{
	System.out.println("signature invalid now");
}

<dependency>
	<groupId>de.elbosso</groupId>
	<artifactId>util</artifactId>
	<version>2.1.0-SNAPSHOT</version>
</dependency>

<repository>
	<id>repsy</id>
	<name>EL BOSSOs (https://elbosso.codeberg.page/index.html) Maven Repository on Repsy</name>
	<url>https://repo.repsy.io/mvn/elbosso/default</url>
</repository>

// Attribute
Attribute[] attribs = att.getAttributes();
de.elbosso.util.security.DecodedAttributeCertificateAttributes decodedAttributes = de.elbosso.util.security.DecodedAttributeCertificateAttributes.decode(attribs);
System.out.println("-------------------");
java.util.Collection<DecodedAttributeCertificateAttributes.AccessIdentity> accessIdentities = decodedAttributes.getAccessIdentities();
if (accessIdentities.isEmpty())
	System.out.println("No access identities contained within certificate!");
else
{
	System.out.println("Access Identities:");
	for (DecodedAttributeCertificateAttributes.AccessIdentity accessIdentity : accessIdentities)
	{
		System.out.println(accessIdentity);
	}
}
System.out.println("-------------------");
Optional<IetfAttrSyntax> chargingIdentity = decodedAttributes.getChargingIdentity();
if (chargingIdentity.isEmpty())
	System.out.println("No charging identity contained within certificate!");
else
{
	System.out.println("Charging Identity:");
	System.out.println(toString(chargingIdentity.get()));
}
System.out.println("-------------------");
Optional<IetfAttrSyntax> groups = decodedAttributes.getGroup();
if (groups.isEmpty())
	System.out.println("No group contained within certificate!");
else
{
	System.out.println("Groups:");
	System.out.println(toString(groups.get()));
}
System.out.println("-------------------");
java.util.Collection<DecodedAttributeCertificateAttributes.ServiceAuthenticationInformation> serviceAuthenticationInformations = decodedAttributes.getServiceAuthenticationInformations();
if (serviceAuthenticationInformations.isEmpty())
	System.out.println("No service authentication information contained within certificate!");
else
{
	System.out.println("Service Authentication Information:");
	for (DecodedAttributeCertificateAttributes.ServiceAuthenticationInformation serviceAuthenticationInformation : serviceAuthenticationInformations)
	{
		System.out.println(serviceAuthenticationInformation);
	}
}
System.out.println("-------------------");
java.util.Collection<RoleSyntax> roles = decodedAttributes.getRoles();
if (roles.isEmpty())
	System.out.println("No role contained within certificate!");
else
{
	System.out.println("Roles:");
	for (RoleSyntax roleSyntax : roles)

		System.out.println(roleSyntax);
}
System.out.println("-------------------");
java.util.Collection<DecodedAttributeCertificateAttributes.Clearance> clearances = decodedAttributes.getClearances();
if (clearances.isEmpty())
	System.out.println("No clearance information contained within certificate!");
else
{
	System.out.println("Clearance Information:");
	for (DecodedAttributeCertificateAttributes.Clearance clearance : clearances)
	{
		System.out.println(clearance);
	}
}