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package com.trilead.ssh2.signature;
import com.trilead.ssh2.crypto.key.Ed25519PrivateKey;
import com.trilead.ssh2.crypto.key.Ed25519PublicKey;
import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec;
import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
import net.i2p.crypto.eddsa.spec.EdDSAPrivateKeySpec;
import org.junit.Test;
import javax.xml.bind.DatatypeConverter;
import java.security.MessageDigest;
import static org.junit.Assert.*;
/**
* Created by kenny on 1/24/16.
*/
public class Ed25519VerifyTest {
/* Test vectors from draft-josefsson-eddsa-ed25519-03 */
private static final byte[] SECRET_KEY = toByteArray("833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42");
private static final byte[] PUBLIC_KEY = toByteArray("ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf");
private static final byte[] MESSAGE = toByteArray("616263");
private static final byte[] SIGNATURE = toByteArray("dc2a4459e7369633a52b1bf277839a00201009a3efbf3ecb69bea2186c26b58909351fc9ac90b3ecfdfbc7c66431e0303dca179c138ac17ad9bef1177331a704");
private static byte[] toByteArray(String s) {
return DatatypeConverter.parseHexBinary(s);
}
@Test
public void verifies() throws Exception {
Ed25519PublicKey pubKey = Ed25519PublicKey.getInstance(PUBLIC_KEY);
MessageDigest md = MessageDigest.getInstance("SHA-512");
assertTrue(Ed25519Verify.verifySignature(md.digest(MESSAGE), SIGNATURE, pubKey));
}
@Test
public void noVerificationForInvalidData() throws Exception {
Ed25519PublicKey pubKey = Ed25519PublicKey.getInstance(PUBLIC_KEY);
MessageDigest md = MessageDigest.getInstance("SHA-512");
assertFalse(Ed25519Verify.verifySignature(md.digest(new byte[1]), SIGNATURE, pubKey));
}
@Test
public void signs() throws Exception {
Ed25519PrivateKey privKey = Ed25519PrivateKey.getInstance(SECRET_KEY);
MessageDigest md = MessageDigest.getInstance("SHA-512");
assertArrayEquals(SIGNATURE, Ed25519Verify.generateSignature(md.digest(MESSAGE), privKey));
}
@Test
public void publicKeyCalculatedCorrectly() throws Exception {
EdDSANamedCurveSpec spec = EdDSANamedCurveTable.getByName("ed25519-sha-512");
EdDSAPrivateKeySpec privKeySpec = new EdDSAPrivateKeySpec(SECRET_KEY, spec);
byte[] pubKeyBytes = privKeySpec.getA().toByteArray();
assertArrayEquals(PUBLIC_KEY, pubKeyBytes);
}
@Test
public void loopbackSuccess() throws Exception {
Ed25519PrivateKey privKey = Ed25519PrivateKey.getInstance(SECRET_KEY);
Ed25519PublicKey pubKey = Ed25519PublicKey.getInstance(PUBLIC_KEY);
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] message = new byte[] { (byte) 0xA5, (byte) 0x5A };
byte[] digest = md.digest(message);
byte[] sig = Ed25519Verify.generateSignature(digest, privKey);
assertTrue(Ed25519Verify.verifySignature(digest, sig, pubKey));
}
}
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