| /* |
| * 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.EncryptionTypeInfo2Entry; |
| import org.apache.directory.shared.asn1.der.ASN1InputStream; |
| import org.apache.directory.shared.asn1.der.DEREncodable; |
| import org.apache.directory.shared.asn1.der.DERGeneralString; |
| 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: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $ |
| */ |
| public class EncryptionTypeInfo2Decoder |
| { |
| /** |
| * Decodes a byte array into an array of {@link EncryptionTypeInfo2Entry}. |
| * |
| * @param encodedEntries |
| * @return The array of {@link EncryptionTypeInfo2Entry}. |
| * @throws IOException |
| */ |
| public EncryptionTypeInfo2Entry[] decode( byte[] encodedEntries ) throws IOException |
| { |
| ASN1InputStream ais = new ASN1InputStream( encodedEntries ); |
| |
| DERSequence sequence = ( DERSequence ) ais.readObject(); |
| |
| return decodeSequence( sequence ); |
| } |
| |
| |
| /** |
| * ETYPE-INFO2 ::= SEQUENCE SIZE (1..MAX) OF ETYPE-INFO2-ENTRY |
| */ |
| protected static EncryptionTypeInfo2Entry[] decodeSequence( DERSequence sequence ) |
| { |
| EncryptionTypeInfo2Entry[] entrySequence = new EncryptionTypeInfo2Entry[sequence.size()]; |
| |
| int ii = 0; |
| for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) |
| { |
| DERSequence object = (DERSequence)e.nextElement(); |
| entrySequence[ii] = decode( object ); |
| ii++; |
| } |
| |
| return entrySequence; |
| } |
| |
| |
| /** |
| * ETYPE-INFO2-ENTRY ::= SEQUENCE { |
| * etype [0] Int32, |
| * salt [1] KerberosString OPTIONAL, |
| * s2kparams [2] OCTET STRING OPTIONAL |
| * } |
| */ |
| protected static EncryptionTypeInfo2Entry decode( DERSequence sequence ) |
| { |
| EncryptionType encryptionType = EncryptionType.NULL; |
| String salt = new String(); |
| byte[] s2kparams = new byte[0]; |
| |
| for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) |
| { |
| DERTaggedObject object = (DERTaggedObject)e.nextElement(); |
| int tag = object.getTagNo(); |
| DEREncodable derObject = object.getObject(); |
| |
| switch ( tag ) |
| { |
| case 0: |
| DERInteger tag0 = ( DERInteger ) derObject; |
| encryptionType = EncryptionType.getTypeByOrdinal( tag0.intValue() ); |
| break; |
| case 1: |
| DERGeneralString tag1 = ( DERGeneralString ) derObject; |
| salt = tag1.getString(); |
| break; |
| case 2: |
| DEROctetString tag2 = ( DEROctetString ) derObject; |
| s2kparams = tag2.getOctets(); |
| break; |
| } |
| } |
| |
| return new EncryptionTypeInfo2Entry( encryptionType, salt, s2kparams ); |
| } |
| } |