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20 package org.apache.directory.server.kerberos.shared.io.decoder;
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23 import java.util.Enumeration;
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25 import org.apache.directory.server.kerberos.shared.crypto.checksum.ChecksumType;
26 import org.apache.directory.server.kerberos.shared.messages.value.Checksum;
27 import org.apache.directory.shared.asn1.der.DEREncodable;
28 import org.apache.directory.shared.asn1.der.DERInteger;
29 import org.apache.directory.shared.asn1.der.DEROctetString;
30 import org.apache.directory.shared.asn1.der.DERSequence;
31 import org.apache.directory.shared.asn1.der.DERTaggedObject;
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38 public class ChecksumDecoder
39 {
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48 public static Checksum decode( DERSequence sequence )
49 {
50 ChecksumType type = ChecksumType.NULL;
51 byte[] data = null;
52
53 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
54 {
55 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
56 int tag = object.getTagNo();
57 DEREncodable derObject = object.getObject();
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59 switch ( tag )
60 {
61 case 0:
62 DERInteger tag0 = ( DERInteger ) derObject;
63 type = ChecksumType.getTypeByOrdinal( tag0.intValue() );
64 break;
65
66 case 1:
67 DEROctetString tag1 = ( DEROctetString ) derObject;
68 data = tag1.getOctets();
69 break;
70 }
71 }
72
73 return new Checksum( type, data );
74 }
75 }