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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.messages.value.PaData;
27 import org.apache.directory.server.kerberos.shared.messages.value.types.PaDataType;
28 import org.apache.directory.shared.asn1.der.ASN1InputStream;
29 import org.apache.directory.shared.asn1.der.DEREncodable;
30 import org.apache.directory.shared.asn1.der.DERInteger;
31 import org.apache.directory.shared.asn1.der.DEROctetString;
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 PreAuthenticationDataDecoder
41 {
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49 public PaData decode( byte[] encodedPreAuthData ) throws IOException
50 {
51 ASN1InputStream ais = new ASN1InputStream( encodedPreAuthData );
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53 DERSequence sequence = ( DERSequence ) ais.readObject();
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55 return decode( sequence );
56 }
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67 protected static PaData[] decodeSequence( DERSequence sequence )
68 {
69 PaData[] paDataSequence = new PaData[sequence.size()];
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71 int ii = 0;
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73 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
74 {
75 DERSequence object = ( DERSequence ) e.nextElement();
76 PaData paData = PreAuthenticationDataDecoder.decode( object );
77 paDataSequence[ii] = paData;
78 ii++;
79 }
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81 return paDataSequence;
82 }
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92 protected static PaData decode( DERSequence sequence )
93 {
94 PaData paData = new PaData();
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96 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
97 {
98 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
99 int tag = object.getTagNo();
100 DEREncodable derObject = object.getObject();
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102 switch ( tag )
103 {
104 case 1:
105 DERInteger padataType = ( DERInteger ) derObject;
106 PaDataType type = PaDataType.getTypeByOrdinal( padataType.intValue() );
107 paData.setPaDataType( type );
108 break;
109 case 2:
110 DEROctetString padataValue = ( DEROctetString ) derObject;
111 paData.setPaDataValue( padataValue.getOctets() );
112 break;
113 }
114 }
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116 return paData;
117 }
118 }