RC4Test.java

import junit.framework.Assert;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.crypto.engines.RC4Engine;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.junit.Before;
import org.junit.Test;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;

/**
 * Created by xuy on 2014/7/16.
 */
public class RC4Test {

    private String secret;
    private String plainText;
    private String expectedCipherText;

    @Before
    public void setUp() throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        secret = "secret";
        plainText = "RC4测试";
        expectedCipherText = "v3Xm+jcvPgmn";
    }

    // use RC4Engine
    @Test
    public void test1() throws Exception {
        RC4Engine streamCipher = new RC4Engine();
        byte[] keyBytes = secret.getBytes();
        streamCipher.init(true, new KeyParameter(keyBytes));

        byte[] plainTextBytes = plainText.getBytes();
        byte[] cipherTextBytes = new byte[plainTextBytes.length];
        streamCipher.processBytes(plainTextBytes, 0, plainTextBytes.length, cipherTextBytes, 0);

        Assert.assertEquals(expectedCipherText, Base64.encodeBase64String(cipherTextBytes));
    }

    // use Cipher
    @Test
    public void test2() throws Exception {
        byte[] keyBytes = secret.getBytes();
        SecretKeySpec key = new SecretKeySpec(keyBytes, "RC4");
        Cipher cipher = Cipher.getInstance("RC4", "BC");
        cipher.init(Cipher.ENCRYPT_MODE, key);

        byte[] plainTextBytes = plainText.getBytes();
        byte[] cipherTextBytes = cipher.doFinal(plainTextBytes);

        Assert.assertEquals(expectedCipherText, Base64.encodeBase64String(cipherTextBytes));
    }

}