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
|
package org.bouncycastle.jcajce.provider.asymmetric.dh;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Hashtable;
import javax.crypto.spec.DHParameterSpec;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.generators.DHBasicKeyPairGenerator;
import org.bouncycastle.crypto.generators.DHParametersGenerator;
import org.bouncycastle.crypto.params.DHKeyGenerationParameters;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
import org.bouncycastle.crypto.params.DHPublicKeyParameters;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class KeyPairGeneratorSpi
extends java.security.KeyPairGenerator
{
private static Hashtable params = new Hashtable();
DHKeyGenerationParameters param;
DHBasicKeyPairGenerator engine = new DHBasicKeyPairGenerator();
int strength = 1024;
int certainty = 20;
SecureRandom random = new SecureRandom();
boolean initialised = false;
public KeyPairGeneratorSpi()
{
super("DH");
}
public void initialize(
int strength,
SecureRandom random)
{
this.strength = strength;
this.random = random;
}
public void initialize(
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException
{
if (!(params instanceof DHParameterSpec))
{
throw new InvalidAlgorithmParameterException("parameter object not a DHParameterSpec");
}
DHParameterSpec dhParams = (DHParameterSpec)params;
param = new DHKeyGenerationParameters(random, new DHParameters(dhParams.getP(), dhParams.getG(), null, dhParams.getL()));
engine.init(param);
initialised = true;
}
public KeyPair generateKeyPair()
{
if (!initialised)
{
// BEGIN android-changed
Integer paramStrength = Integer.valueOf(strength);
// END android-changed
if (params.containsKey(paramStrength))
{
param = (DHKeyGenerationParameters)params.get(paramStrength);
}
else
{
DHParameterSpec dhParams = BouncyCastleProvider.CONFIGURATION.getDHDefaultParameters();
if (dhParams != null && dhParams.getP().bitLength() == strength)
{
param = new DHKeyGenerationParameters(random, new DHParameters(dhParams.getP(), dhParams.getG(), null, dhParams.getL()));
}
else
{
DHParametersGenerator pGen = new DHParametersGenerator();
pGen.init(strength, certainty, random);
param = new DHKeyGenerationParameters(random, pGen.generateParameters());
params.put(paramStrength, param);
}
}
engine.init(param);
initialised = true;
}
AsymmetricCipherKeyPair pair = engine.generateKeyPair();
DHPublicKeyParameters pub = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters priv = (DHPrivateKeyParameters)pair.getPrivate();
return new KeyPair(new BCDHPublicKey(pub),
new BCDHPrivateKey(priv));
}
}
|