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20 package org.apache.directory.server.kerberos.shared.io.decoder;
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23 import java.io.IOException;
24 import java.util.Enumeration;
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26 import org.apache.directory.server.kerberos.shared.KerberosMessageType;
27 import org.apache.directory.server.kerberos.shared.messages.application.PrivateMessage;
28 import org.apache.directory.shared.asn1.der.ASN1InputStream;
29 import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
30 import org.apache.directory.shared.asn1.der.DEREncodable;
31 import org.apache.directory.shared.asn1.der.DERInteger;
32 import org.apache.directory.shared.asn1.der.DERSequence;
33 import org.apache.directory.shared.asn1.der.DERTaggedObject;
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40 public class PrivateMessageDecoder
41 {
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49 public PrivateMessage decode( byte[] encodedPrivateMessage ) throws IOException
50 {
51 ASN1InputStream ais = new ASN1InputStream( encodedPrivateMessage );
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53 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
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55 DERSequence privateMessage = ( DERSequence ) app.getObject();
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57 return decodePrivateMessageSequence( privateMessage );
58 }
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60
61 private PrivateMessage decodePrivateMessageSequence( DERSequence sequence )
62 {
63 PrivateMessage message = new PrivateMessage();
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65 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
66 {
67 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
68 int tag = object.getTagNo();
69 DEREncodable derObject = object.getObject();
70
71 switch ( tag )
72 {
73 case 0:
74 DERInteger tag0 = ( DERInteger ) derObject;
75 message.setProtocolVersionNumber( tag0.intValue() );
76 break;
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78 case 1:
79 DERInteger tag1 = ( DERInteger ) derObject;
80 message.setMessageType( KerberosMessageType.getTypeByOrdinal( tag1.intValue() ) );
81 break;
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83 case 3:
84 DERSequence tag3 = ( DERSequence ) derObject;
85 message.setEncryptedPart( EncryptedDataDecoder.decode( tag3 ) );
86 break;
87 }
88 }
89
90 return message;
91 }
92 }