Add byte[] overloads for all String ctors

[altr-benjamin]

Add constructors that accept byte[] values for key and tweak. In the event a user is working with byte[] cryptographic primitives, this allows them to avoid the unnecessary overhead of converting to/from Strings to initialize the cipher.

This does not contain any breaking changes w.r.t. the FF3Cipher class interface.

[bschoening]

@altr-benjamin this looks terrific, thanks. Could you add a simple unit test testFF3_2() for it exercise the new constructors.

[altr-benjamin]

@altr-benjamin this looks terrific, thanks. Could you add a simple unit test testFF3_2() for it exercise the new constructors.

Hi @bschoening, I extended the testCreate test method to include all 6 constructors with the same assertion (not null after create). Is that what you're looking for?

[bschoening]

@altr-benjamin it's a good idea to have those constructors called, but I'd also like to add an encrypt/decrypt test with the bytes[] constructor and asserts for expected ciphertext and decrypted plaintext.

So, adding another new test similar to testFF3_1, but let's call it testFF3_1_bytes or something

@Test
public void testFF3_1() throws Exception {
    // Test with 56 bit tweak
    String[] testVector = TestVectors[0];
    FF3Cipher c = new FF3Cipher(testVector[Tkey], "D8E7920AFA330A", Integer.parseInt(testVector[Tradix]));
    String pt = testVector[Tplaintext], ct = "477064185124354662";
    String ciphertext = c.encrypt(pt);
    String plaintext = c.decrypt(ciphertext);
    assertEquals(ct, ciphertext);
    assertEquals(pt, plaintext);
}