public FpeCharDecryptor(FpeEngine fpeEngine, byte[] key, byte[] tweak, char[] alphabet)
{
this.fpeEngine = fpeEngine;
alphabetMapper = new BasicAlphabetMapper(alphabet);
fpeEngine.Init(false, new FpeParameters(new KeyParameter(key), alphabetMapper.Radix, tweak));
}
private void ff3_1Test(IAlphabetMapper alphabetMapper, String skey, String stweak, String input, String output)
{
FpeEngine fpeEncEngine = new FpeFf3_1Engine();
FpeEngine fpeDecEngine = new FpeFf3_1Engine();
byte[] key = Hex.Decode(skey);
byte[] tweak = Hex.Decode(stweak);
int radix = alphabetMapper.Radix;
fpeEncEngine.Init(true, new FpeParameters(new KeyParameter(key), radix, tweak));
fpeDecEngine.Init(false, new FpeParameters(new KeyParameter(key), radix, tweak));
byte[] bytes = alphabetMapper.ConvertToIndexes(input.ToCharArray());
byte[] encryptedBytes = process(fpeEncEngine, bytes);
IsEquals(output, new String(alphabetMapper.ConvertToChars(encryptedBytes)));
byte[] decryptedBytes = process(fpeDecEngine, encryptedBytes);
IsTrue(Arrays.AreEqual(bytes, decryptedBytes));
char[] chars = alphabetMapper.ConvertToChars(decryptedBytes);
IsEquals(input, new String(chars));
}
