| /* |
| * 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.Enumeration; |
| |
| import org.apache.directory.server.kerberos.shared.crypto.encryption.EncryptionType; |
| import org.apache.directory.server.kerberos.shared.messages.value.EncryptedData; |
| 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 EncryptedDataDecoder |
| { |
| /** |
| * Decodes a byte array into an {@link EncryptedData}. |
| * |
| * @param encodedEncryptedData |
| * @return The {@link EncryptedData}. |
| * @throws IOException |
| */ |
| public static EncryptedData decode( byte[] encodedEncryptedData ) throws IOException |
| { |
| ASN1InputStream ais = new ASN1InputStream( encodedEncryptedData ); |
| |
| DERSequence sequence = ( DERSequence ) ais.readObject(); |
| |
| return decode( sequence ); |
| } |
| |
| |
| /** |
| * Decodes a {@link DERSequence} into an {@link EncryptedData}. |
| * |
| * EncryptedData ::= SEQUENCE { |
| * etype[0] INTEGER, -- EncryptionEngine |
| * kvno[1] INTEGER OPTIONAL, |
| * cipher[2] OCTET STRING -- ciphertext |
| * } |
| * |
| * @param sequence |
| * @return The {@link EncryptedData}. |
| */ |
| public static EncryptedData decode( DERSequence sequence ) |
| { |
| EncryptedData encryptedData = new EncryptedData(); |
| |
| for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); ) |
| { |
| DERTaggedObject object = ( DERTaggedObject ) e.nextElement(); |
| int tag = object.getTagNo(); |
| DEREncodable derObject = object.getObject(); |
| |
| switch ( tag ) |
| { |
| case 0: |
| DERInteger etype = ( DERInteger ) derObject; |
| encryptedData.setEncryptionType( EncryptionType.getTypeByOrdinal( etype.intValue() ) ); |
| break; |
| |
| case 1: |
| DERInteger kvno = ( DERInteger ) derObject; |
| encryptedData.setKeyVersion( kvno.intValue() ); |
| break; |
| |
| case 2: |
| DEROctetString cipher = ( DEROctetString ) derObject; |
| encryptedData.setCipherText( cipher.getOctets() ); |
| break; |
| } |
| } |
| |
| return encryptedData; |
| } |
| } |