| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.server.kerberos.shared.io.decoder; |
| |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Enumeration; |
| import java.util.List; |
| |
| import org.apache.directory.server.kerberos.shared.messages.value.PreAuthenticationData; |
| import org.apache.directory.server.kerberos.shared.messages.value.types.PreAuthenticationDataType; |
| import org.apache.directory.shared.asn1.der.ASN1InputStream; |
| import org.apache.directory.shared.asn1.der.DEREncodable; |
| import org.apache.directory.shared.asn1.der.DERInteger; |
| import org.apache.directory.shared.asn1.der.DEROctetString; |
| import org.apache.directory.shared.asn1.der.DERSequence; |
| import org.apache.directory.shared.asn1.der.DERTaggedObject; |
| |
| |
| /** |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @version $Rev$, $Date$ |
| */ |
| public class PreAuthenticationDataDecoder |
| { |
| /** |
| * Decodes a byte array into {@link PreAuthenticationData}. |
| * |
| * @param encodedPreAuthData |
| * @return The {@link PreAuthenticationData}. |
| * @throws IOException |
| */ |
| public PreAuthenticationData decode( byte[] encodedPreAuthData ) throws IOException |
| { |
| ASN1InputStream ais = new ASN1InputStream( encodedPreAuthData ); |
| |
| DERSequence sequence = ( DERSequence ) ais.readObject(); |
| |
| return decode( sequence ); |
| } |
| |
| |
| /** |
| * KDC-REQ ::= SEQUENCE { |
| * pvno[1] INTEGER, |
| * msg-type[2] INTEGER, |
| * padata[3] SEQUENCE OF PA-DATA OPTIONAL, |
| * req-body[4] KDC-REQ-BODY |
| * } |
| */ |
| protected static List<PreAuthenticationData> decodeSequence( DERSequence sequence ) |
| { |
| List<PreAuthenticationData> paDataSequence = new ArrayList<PreAuthenticationData>( sequence.size() ); |
| |
| for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); ) |
| { |
| DERSequence object = ( DERSequence ) e.nextElement(); |
| PreAuthenticationData paData = PreAuthenticationDataDecoder.decode( object ); |
| paDataSequence.add( paData ); |
| } |
| |
| return paDataSequence; |
| } |
| |
| |
| /** |
| * PA-DATA ::= SEQUENCE { |
| * padata-type[1] INTEGER, |
| * padata-value[2] OCTET STRING, |
| * -- might be encoded AP-REQ |
| * } |
| */ |
| protected static PreAuthenticationData decode( DERSequence sequence ) |
| { |
| PreAuthenticationDataType type = null; |
| byte[] value = null; |
| |
| for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); ) |
| { |
| DERTaggedObject object = ( DERTaggedObject ) e.nextElement(); |
| int tag = object.getTagNo(); |
| DEREncodable derObject = object.getObject(); |
| |
| switch ( tag ) |
| { |
| case 1: |
| DERInteger padataType = ( DERInteger ) derObject; |
| type = PreAuthenticationDataType.getTypeByOrdinal( padataType.intValue() ); |
| break; |
| |
| case 2: |
| DEROctetString padataValue = ( DEROctetString ) derObject; |
| value = padataValue.getOctets(); |
| break; |
| } |
| } |
| |
| return new PreAuthenticationData( type, value ); |
| } |
| } |