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1
17
18 package org.apache.geronimo.util.jce.provider;
19
20 import java.io.ByteArrayOutputStream  ;
21 import java.io.IOException ;
22 import java.io.ObjectInputStream ;
23 import java.io.ObjectOutputStream ;
24 import java.math.BigInteger ;
25
26 import javax.crypto.interfaces.DHPublicKey;
27 import javax.crypto.spec.DHParameterSpec;
28 import javax.crypto.spec.DHPublicKeySpec;
29
30 import org.apache.geronimo.util.asn1.ASN1Sequence;
31 import org.apache.geronimo.util.asn1.DERInteger;
32 import org.apache.geronimo.util.asn1.DEROutputStream;
33 import org.apache.geronimo.util.asn1.pkcs.DHParameter;
34 import org.apache.geronimo.util.asn1.x509.AlgorithmIdentifier;
35 import org.apache.geronimo.util.asn1.x509.SubjectPublicKeyInfo;
36 import org.apache.geronimo.util.asn1.x9.X9ObjectIdentifiers;
37 import org.apache.geronimo.util.crypto.params.DHPublicKeyParameters;
38
39 public class JCEDHPublicKey
40 implements DHPublicKey
41 {
42 private BigInteger y;
43 private DHParameterSpec dhSpec;
44
45 JCEDHPublicKey(
46 DHPublicKeySpec spec)
47 {
48 this.y = spec.getY();
49 this.dhSpec = new DHParameterSpec(spec.getP(), spec.getG());
50 }
51
52 JCEDHPublicKey(
53 DHPublicKey key)
54 {
55 this.y = key.getY();
56 this.dhSpec = key.getParams();
57 }
58
59 JCEDHPublicKey(
60 DHPublicKeyParameters params)
61 {
62 this.y = params.getY();
63 this.dhSpec = new DHParameterSpec(params.getParameters().getP(), params.getParameters().getG(), 0);
64 }
65
66 JCEDHPublicKey(
67 BigInteger y,
68 DHParameterSpec dhSpec)
69 {
70 this.y = y;
71 this.dhSpec = dhSpec;
72 }
73
74 JCEDHPublicKey(
75 SubjectPublicKeyInfo info)
76 {
77 DHParameter params = new DHParameter((ASN1Sequence)info.getAlgorithmId().getParameters());
78 DERInteger derY = null;
79
80 try
81 {
82 derY = (DERInteger)info.getPublicKey();
83 }
84 catch (IOException e)
85 {
86 throw new IllegalArgumentException ("invalid info structure in DH public key");
87 }
88
89 this.y = derY.getValue();
90 if (params.getL() != null)
91 {
92 this.dhSpec = new DHParameterSpec(params.getP(), params.getG(), params.getL().intValue());
93 }
94 else
95 {
96 this.dhSpec = new DHParameterSpec(params.getP(), params.getG());
97 }
98 }
99
100 public String getAlgorithm()
101 {
102 return "DH";
103 }
104
105 public String getFormat()
106 {
107 return "X.509";
108 }
109
110 public byte[] getEncoded()
111 {
112 ByteArrayOutputStream bOut = new ByteArrayOutputStream ();
113 DEROutputStream dOut = new DEROutputStream(bOut);
114 SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.dhpublicnumber, new DHParameter(dhSpec.getP(), dhSpec.getG(), dhSpec.getL()).getDERObject()), new DERInteger(y));
115
116 try
117 {
118 dOut.writeObject(info);
119 dOut.close();
120 }
121 catch (IOException e)
122 {
123 throw new RuntimeException ("Error encoding DH public key");
124 }
125
126 return bOut.toByteArray();
127
128 }
129
130 public DHParameterSpec getParams()
131 {
132 return dhSpec;
133 }
134
135 public BigInteger getY()
136 {
137 return y;
138 }
139
140 private void readObject(
141 ObjectInputStream in)
142 throws IOException , ClassNotFoundException
143 {
144 this.y = (BigInteger )in.readObject();
145 this.dhSpec = new DHParameterSpec((BigInteger )in.readObject(), (BigInteger )in.readObject(), in.readInt());
146 }
147
148 private void writeObject(
149 ObjectOutputStream out)
150 throws IOException
151 {
152 out.writeObject(this.getY());
153 out.writeObject(dhSpec.getP());
154 out.writeObject(dhSpec.getG());
155 out.writeInt(dhSpec.getL());
156 }
157 }
158 |
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