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package org.gnunet.util;
import org.junit.Assert;
import org.junit.Test;
import java.util.Random;
public class CryptoECCTest {
/**
* Check that signed messages can be verified correctly.
*/
@Test
public void test_sign_success() {
Random r = new Random();
// the test uses random data, repeat it multiple times!
for (int i = 0; i < 5; i++) {
byte[] msg = new byte[16];
r.nextBytes(msg);
CryptoECC.PrivateKey privateKey = new CryptoECC.PrivateKey();
privateKey.d = new byte[32];
r.nextBytes(privateKey.d);
CryptoECC.PublicSignKey publicKey = CryptoECC.computePublicKey(privateKey);
System.out.println("gen");
CryptoECC.Signature sig = CryptoECC.sign(msg, privateKey, publicKey);
System.out.println("sign");
boolean valid = CryptoECC.verify(sig, msg, publicKey);
System.out.println("verify");
Assert.assertTrue(valid);
}
}
/**
* Check that signature verification fails for manipulated data.
*/
@Test
public void test_sign_failure() {
Random r = new Random();
// the test uses random data, repeat it multiple times!
for (int i = 0; i < 5; i++) {
byte[] msg = new byte[16];
r.nextBytes(msg);
CryptoECC.PrivateKey privateKey = new CryptoECC.PrivateKey();
privateKey.d = new byte[32];
r.nextBytes(privateKey.d);
CryptoECC.PublicSignKey publicKey = CryptoECC.computePublicKey(privateKey);
System.out.println("gen");
CryptoECC.Signature sig = CryptoECC.sign(msg, privateKey, publicKey);
System.out.println("sign");
// corrupt the message
msg[0] = (byte) (msg[0] + 1);
boolean valid = CryptoECC.verify(sig, msg, publicKey);
System.out.println("verify");
Assert.assertFalse(valid);
}
}
/**
* Check whether ecdh key coincide
*/
@Test
public void test_ecdh() {
Random r = new Random();
CryptoECC.PrivateKey privateAlice = new CryptoECC.PrivateKey();
privateAlice.d = new byte[32];
r.nextBytes(privateAlice.d);
CryptoECC.PublicSignKey publicAlice = CryptoECC.computePublicKey(privateAlice);
CryptoECC.PrivateKey privateBob = new CryptoECC.PrivateKey();
privateBob.d = new byte[32];
r.nextBytes(privateBob.d);
CryptoECC.PublicSignKey publicBob = CryptoECC.computePublicKey(privateBob);
HashCode ssAlice = CryptoECC.ecdh(privateAlice, publicBob);
HashCode ssBob = CryptoECC.ecdh(privateBob, publicAlice);
Assert.assertArrayEquals(ssAlice.data, ssBob.data);
}
}
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