SignerAndVerifierImplTest.java

/*
 * Copyright 2012 Mirko Caserta
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this software except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.springcryptoutils.core.signature;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.io.UnsupportedEncodingException;
import java.util.UUID;

import static org.junit.Assert.*;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class SignerAndVerifierImplTest {

    @Autowired
    private Signer signer;

    @Autowired
    private Verifier verifier;

    private byte[] message;

    @Before
    public void setup() throws UnsupportedEncodingException {
        assertNotNull(signer);
        assertNotNull(verifier);
        message = "this is a top-secret message".getBytes("UTF-8");
    }

    @Test
    public void testSignAndVerify() throws UnsupportedEncodingException {
        byte[] signature = signer.sign(message);
        assertNotNull(signature);
        assertTrue(verifier.verify(message, signature));
    }

    @Test
    public void testSignAndVerifyInALoop() throws UnsupportedEncodingException {
        for (int i = 0; i < 100; i++) {
            final byte[] message = UUID.randomUUID().toString().getBytes("UTF-8");
            byte[] signature = signer.sign(message);
            assertNotNull(signature);
            assertTrue(verifier.verify(message, signature));
        }
    }

    @Test
    public void testVerifyWithGarbageSignatureFails() throws UnsupportedEncodingException {
        assertFalse(verifier.verify(message, "garbage".getBytes("UTF-8")));
    }

    @Test
    public void testVerifyWithTamperedMessageFails() throws UnsupportedEncodingException {
        byte[] signature = signer.sign(message);
        assertNotNull(signature);
        assertFalse(verifier.verify(new byte[]{1, 2, 3}, signature));
    }

}