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Crypto: Add X25519 DH method, prep for enc. ls2 auth.

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zzz
2019-05-22 11:04:17 +00:00
parent a6434fb71e
commit 62649a6343
2 changed files with 41 additions and 0 deletions
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34
core/java/src/net/i2p/crypto/x25519/X25519DH.java Normal file
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package net.i2p.crypto.x25519;
import com.southernstorm.noise.crypto.x25519.Curve25519;
import net.i2p.crypto.EncType;
import net.i2p.data.PrivateKey;
import net.i2p.data.PublicKey;
import net.i2p.data.SessionKey;
/**
* DH wrapper around Noise's Curve25519 with I2P types.
*
* @since 0.9.41
*/
public class X25519DH {
private static final EncType TYPE = EncType.ECIES_X25519;
private X25519DH() {}
/**
* DH
*
* @return ECIES_X25519
* @throws IllegalArgumentException if not ECIES_X25519
*/
public static SessionKey dh(PrivateKey priv, PublicKey pub) {
if (priv.getType() != TYPE || pub.getType() != TYPE)
throw new IllegalArgumentException();
byte[] rv = new byte[32];
Curve25519.eval(rv, 0, priv.getData(), pub.getData());
return new SessionKey(rv);
}
}

7
core/java/src/net/i2p/crypto/x25519/package.html Normal file
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<html><body>
<p>
DH for X25519.
</p><p>
Since 0.9.41.
</p>
</body></html>