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Added MAC function to crypto component.

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akwizgran
2016-08-26 10:06:24 +01:00
parent 00240bfa57
commit 30f2c192c6
3 changed files with 88 additions and 0 deletions
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67
briar-tests/src/org/briarproject/crypto/MacTest.java Normal file
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package org.briarproject.crypto;
import org.briarproject.BriarTestCase;
import org.briarproject.TestSeedProvider;
import org.briarproject.TestUtils;
import org.briarproject.api.crypto.CryptoComponent;
import org.briarproject.api.crypto.SecretKey;
import org.junit.Test;
import java.util.Arrays;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertFalse;
public class MacTest extends BriarTestCase {
private final CryptoComponent crypto;
public MacTest() {
crypto = new CryptoComponentImpl(new TestSeedProvider());
}
@Test
public void testIdenticalKeysAndInputsProduceIdenticalMacs() {
// Generate a random key and some random input
byte[] keyBytes = TestUtils.getRandomBytes(SecretKey.LENGTH);
SecretKey k = new SecretKey(keyBytes);
byte[] inputBytes = TestUtils.getRandomBytes(123);
byte[] inputBytes1 = TestUtils.getRandomBytes(234);
byte[] inputBytes2 = new byte[0];
// Calculate the MAC twice - the results should be identical
byte[] mac = crypto.mac(k, inputBytes, inputBytes1, inputBytes2);
byte[] mac1 = crypto.mac(k, inputBytes, inputBytes1, inputBytes2);
assertArrayEquals(mac, mac1);
}
@Test
public void testDifferentKeysProduceDifferentMacs() {
// Generate two random keys and some random input
byte[] keyBytes = TestUtils.getRandomBytes(SecretKey.LENGTH);
SecretKey k = new SecretKey(keyBytes);
byte[] keyBytes1 = TestUtils.getRandomBytes(SecretKey.LENGTH);
SecretKey k1 = new SecretKey(keyBytes1);
byte[] inputBytes = TestUtils.getRandomBytes(123);
byte[] inputBytes1 = TestUtils.getRandomBytes(234);
byte[] inputBytes2 = new byte[0];
// Calculate the MAC with each key - the results should be different
byte[] mac = crypto.mac(k, inputBytes, inputBytes1, inputBytes2);
byte[] mac1 = crypto.mac(k1, inputBytes, inputBytes1, inputBytes2);
assertFalse(Arrays.equals(mac, mac1));
}
@Test
public void testDifferentInputsProduceDifferentMacs() {
// Generate a random key and some random input
byte[] keyBytes = TestUtils.getRandomBytes(SecretKey.LENGTH);
SecretKey k = new SecretKey(keyBytes);
byte[] inputBytes = TestUtils.getRandomBytes(123);
byte[] inputBytes1 = TestUtils.getRandomBytes(234);
byte[] inputBytes2 = new byte[0];
// Calculate the MAC with the inputs in different orders - the results
// should be different
byte[] mac = crypto.mac(k, inputBytes, inputBytes1, inputBytes2);
byte[] mac1 = crypto.mac(k, inputBytes2, inputBytes1, inputBytes);
assertFalse(Arrays.equals(mac, mac1));
}
}