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package com.trilead.ssh2.crypto.dh;
import djb.Curve25519;
import org.junit.Test;
import javax.xml.bind.DatatypeConverter;
import java.math.BigInteger;
import java.security.SecureRandom;
import static org.junit.Assert.*;
/**
* Created by Kenny Root on 1/23/16.
*/
public class Curve25519ExchangeTest {
private static final byte[] ALICE_PRIVATE = toByteArray("77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a");
private static final byte[] ALICE_PUBLIC = toByteArray("8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a");
private static final byte[] BOB_PRIVATE = toByteArray("5dab087e624a8a4b79e17f8b83800ee66f3bb1292618b6fd1c2f8b27ff88e0eb");
private static final byte[] BOB_PUBLIC = toByteArray("de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f");
private static final byte[] KNOWN_SHARED_SECRET = toByteArray("4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742");
private static final BigInteger KNOWN_SHARED_SECRET_BI = new BigInteger(1, KNOWN_SHARED_SECRET);
private static byte[] toByteArray(String s) {
return DatatypeConverter.parseHexBinary(s);
}
@Test
public void selfAgreement() throws Exception {
SecureRandom sr = new SecureRandom();
byte[] alicePrivKey = new byte[Curve25519.KEY_SIZE];
sr.nextBytes(alicePrivKey);
byte[] alicePubKey = new byte[Curve25519.KEY_SIZE];
Curve25519.keygen(alicePubKey, null, alicePrivKey);
byte[] bobPrivKey = new byte[Curve25519.KEY_SIZE];
sr.nextBytes(bobPrivKey);
byte[] bobPubKey = new byte[Curve25519.KEY_SIZE];
Curve25519.keygen(bobPubKey, null, bobPrivKey);
Curve25519Exchange alice = new Curve25519Exchange(alicePrivKey);
alice.setF(bobPubKey);
Curve25519Exchange bob = new Curve25519Exchange(bobPrivKey);
bob.setF(alicePubKey);
assertNotNull(alice.sharedSecret);
assertEquals(alice.sharedSecret, bob.sharedSecret);
}
@Test
public void deriveAlicePublicKey() throws Exception {
byte[] pubKey = new byte[Curve25519.KEY_SIZE];
Curve25519.keygen(pubKey, null, ALICE_PRIVATE);
assertArrayEquals(ALICE_PUBLIC, pubKey);
}
@Test
public void deriveBobPublicKey() throws Exception {
byte[] pubKey = new byte[Curve25519.KEY_SIZE];
Curve25519.keygen(pubKey, null, BOB_PRIVATE);
assertArrayEquals(BOB_PUBLIC, pubKey);
}
@Test
public void knownValues_Alice() throws Exception {
Curve25519Exchange ex = new Curve25519Exchange(ALICE_PRIVATE);
ex.setF(BOB_PUBLIC);
assertEquals(KNOWN_SHARED_SECRET_BI, ex.sharedSecret);
}
@Test
public void knownValues_Bob() throws Exception {
Curve25519Exchange ex = new Curve25519Exchange(BOB_PRIVATE);
ex.setF(ALICE_PUBLIC);
assertEquals(KNOWN_SHARED_SECRET_BI, ex.sharedSecret);
}
}
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