for ( int i = 0; i < mechs.length; i++ ) {
                    vector.add(mechs[ i ]);
                }
                fields.add(new DERTaggedObject(true, 0, new DERSequence(vector)));
            }
            int ctxFlags = getContextFlags();
            if ( ctxFlags != 0 ) {
                fields.add(new DERTaggedObject(true, 1, new DERBitString(ctxFlags)));
            }

        Set<Object> serverPrivateCredentials = this.subject.getPrivateCredentials();
        for ( Object credential : serverPrivateCredentials )
            if ( credential instanceof KerberosKey )
                serverKeys.add((KerberosKey) credential);

        return serverKeys.toArray(new KerberosKey[0]);
    }


    public KerberosKey getKey ( int keyType ) {
        KerberosKey serverKey = null;