blob: f87b416fa597a3e6b3df67ef6d17250a5eb5c4f6 (
plain)
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
|
package org.spongycastle.crypto.generators;
import org.spongycastle.crypto.AsymmetricCipherKeyPair;
import org.spongycastle.crypto.AsymmetricCipherKeyPairGenerator;
import org.spongycastle.crypto.KeyGenerationParameters;
import org.spongycastle.crypto.params.DHKeyGenerationParameters;
import org.spongycastle.crypto.params.DHParameters;
import org.spongycastle.crypto.params.DHPrivateKeyParameters;
import org.spongycastle.crypto.params.DHPublicKeyParameters;
import java.math.BigInteger;
/**
* a Diffie-Hellman key pair generator.
*
* This generates keys consistent for use in the MTI/A0 key agreement protocol
* as described in "Handbook of Applied Cryptography", Pages 516-519.
*/
public class DHKeyPairGenerator
implements AsymmetricCipherKeyPairGenerator
{
private DHKeyGenerationParameters param;
public void init(
KeyGenerationParameters param)
{
this.param = (DHKeyGenerationParameters)param;
}
public AsymmetricCipherKeyPair generateKeyPair()
{
DHKeyGeneratorHelper helper = DHKeyGeneratorHelper.INSTANCE;
DHParameters dhp = param.getParameters();
BigInteger x = helper.calculatePrivate(dhp, param.getRandom());
BigInteger y = helper.calculatePublic(dhp, x);
return new AsymmetricCipherKeyPair(
new DHPublicKeyParameters(y, dhp),
new DHPrivateKeyParameters(x, dhp));
}
}
|