1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 package org.apache.directory.server.kerberos.shared.io.decoder;
21
22
23 import java.io.IOException;
24 import java.util.Enumeration;
25
26 import org.apache.directory.server.kerberos.shared.crypto.encryption.EncryptionType;
27 import org.apache.directory.server.kerberos.shared.messages.value.EncryptionTypeInfo2Entry;
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.DERGeneralString;
31 import org.apache.directory.shared.asn1.der.DERInteger;
32 import org.apache.directory.shared.asn1.der.DEROctetString;
33 import org.apache.directory.shared.asn1.der.DERSequence;
34 import org.apache.directory.shared.asn1.der.DERTaggedObject;
35
36
37
38
39
40
41 public class EncryptionTypeInfo2Decoder
42 {
43
44
45
46
47
48
49
50 public EncryptionTypeInfo2Entry[] decode( byte[] encodedEntries ) throws IOException
51 {
52 ASN1InputStream ais = new ASN1InputStream( encodedEntries );
53
54 DERSequence sequence = ( DERSequence ) ais.readObject();
55
56 return decodeSequence( sequence );
57 }
58
59
60
61
62
63 protected static EncryptionTypeInfo2Entry[] decodeSequence( DERSequence sequence )
64 {
65 EncryptionTypeInfo2Entry[] entrySequence = new EncryptionTypeInfo2Entry[sequence.size()];
66
67 int ii = 0;
68 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
69 {
70 DERSequence object = (DERSequence)e.nextElement();
71 entrySequence[ii] = decode( object );
72 ii++;
73 }
74
75 return entrySequence;
76 }
77
78
79
80
81
82
83
84
85
86 protected static EncryptionTypeInfo2Entry decode( DERSequence sequence )
87 {
88 EncryptionType encryptionType = EncryptionType.NULL;
89 String salt = new String();
90 byte[] s2kparams = new byte[0];
91
92 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
93 {
94 DERTaggedObject object = (DERTaggedObject)e.nextElement();
95 int tag = object.getTagNo();
96 DEREncodable derObject = object.getObject();
97
98 switch ( tag )
99 {
100 case 0:
101 DERInteger tag0 = ( DERInteger ) derObject;
102 encryptionType = EncryptionType.getTypeByOrdinal( tag0.intValue() );
103 break;
104 case 1:
105 DERGeneralString tag1 = ( DERGeneralString ) derObject;
106 salt = tag1.getString();
107 break;
108 case 2:
109 DEROctetString tag2 = ( DEROctetString ) derObject;
110 s2kparams = tag2.getOctets();
111 break;
112 }
113 }
114
115 return new EncryptionTypeInfo2Entry( encryptionType, salt, s2kparams );
116 }
117 }