1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
package org.bouncycastle.jce.provider;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.util.Enumeration;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.DHPrivateKeySpec;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.oiw.ElGamalParameter;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.bouncycastle.jce.interfaces.ElGamalPrivateKey;
import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
import org.bouncycastle.jce.spec.ElGamalParameterSpec;
import org.bouncycastle.jce.spec.ElGamalPrivateKeySpec;
public class JCEElGamalPrivateKey
implements ElGamalPrivateKey, DHPrivateKey, PKCS12BagAttributeCarrier
{
static final long serialVersionUID = 4819350091141529678L;
BigInteger x;
ElGamalParameterSpec elSpec;
private PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
protected JCEElGamalPrivateKey()
{
}
JCEElGamalPrivateKey(
ElGamalPrivateKey key)
{
this.x = key.getX();
this.elSpec = key.getParameters();
}
JCEElGamalPrivateKey(
DHPrivateKey key)
{
this.x = key.getX();
this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
JCEElGamalPrivateKey(
ElGamalPrivateKeySpec spec)
{
this.x = spec.getX();
this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
}
JCEElGamalPrivateKey(
DHPrivateKeySpec spec)
{
this.x = spec.getX();
this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
}
JCEElGamalPrivateKey(
PrivateKeyInfo info)
throws IOException
{
ElGamalParameter params = ElGamalParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
ASN1Integer derX = ASN1Integer.getInstance(info.parsePrivateKey());
this.x = derX.getValue();
this.elSpec = new ElGamalParameterSpec(params.getP(), params.getG());
}
JCEElGamalPrivateKey(
ElGamalPrivateKeyParameters params)
{
this.x = params.getX();
this.elSpec = new ElGamalParameterSpec(params.getParameters().getP(), params.getParameters().getG());
}
public String getAlgorithm()
{
return "ElGamal";
}
/**
* return the encoding format we produce in getEncoded().
*
* @return the string "PKCS#8"
*/
public String getFormat()
{
return "PKCS#8";
}
/**
* Return a PKCS8 representation of the key. The sequence returned
* represents a full PrivateKeyInfo object.
*
* @return a PKCS8 representation of the key.
*/
public byte[] getEncoded()
{
return KeyUtil.getEncodedPrivateKeyInfo(new AlgorithmIdentifier(OIWObjectIdentifiers.elGamalAlgorithm, new ElGamalParameter(elSpec.getP(), elSpec.getG())), new ASN1Integer(getX()));
}
public ElGamalParameterSpec getParameters()
{
return elSpec;
}
public DHParameterSpec getParams()
{
return new DHParameterSpec(elSpec.getP(), elSpec.getG());
}
public BigInteger getX()
{
return x;
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
x = (BigInteger)in.readObject();
this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject());
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.writeObject(this.getX());
out.writeObject(elSpec.getP());
out.writeObject(elSpec.getG());
}
public void setBagAttribute(
ASN1ObjectIdentifier oid,
ASN1Encodable attribute)
{
attrCarrier.setBagAttribute(oid, attribute);
}
public ASN1Encodable getBagAttribute(
ASN1ObjectIdentifier oid)
{
return attrCarrier.getBagAttribute(oid);
}
public Enumeration getBagAttributeKeys()
{
return attrCarrier.getBagAttributeKeys();
}
}
|
