http://www.bouncycastle.org/java.html: 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. 
package org.bouncycastle.asn1;

public class ASN1ObjectIdentifier
    extends DERObjectIdentifier
{
    public ASN1ObjectIdentifier(String identifier)
    {
        super(identifier);
    }

    ASN1ObjectIdentifier(byte[] bytes)
    {
        super(bytes);
    }

    
Return an OID that creates a branch under the current one.

Params:
  • branchID – node numbers for the new branch.
Returns:
/**
     * Return an OID that creates a branch under the current one.
     *
     * @param branchID node numbers for the new branch.
     * @return
     */
    public ASN1ObjectIdentifier branch(String branchID)
    {
        return new ASN1ObjectIdentifier(getId() + "." + branchID);
    }
}