hcrypto.cipher
Class BlockCipher

java.lang.Object
  hcrypto.cipher.CipherEngine
      hcrypto.cipher.BlockCipher

Direct Known Subclasses:

AffineEngine, CaesarEngine, CaesarEngine, NullEngine, PlayfairEngine, PolySubstitutionEngine, RailfenceEngine, SubstitutionEngine, TranspositionEngine, VigenereEngine

public abstract class BlockCipher
extends CipherEngine

Abstract class representing a basic block cipher. It provides implementations of methods to encrypt and decrypt files and strings, for the entire range of cipher engines.

Subclasses of this class must implement three methods: engineInit(HistoricalKey), engineEncode(String) and engineDecode(String). Of course, each particular cipher algorithm will implement these methods in its own way.

Traditional character ciphers, such as Caesar, Simple Substitution, Vigenere, and Enigma, can be represented as special cases of a block cipher by setting the blocksize to 1. This should be done in the engineInit() method.

The engineEncrypt() and engineDecrypt() methods also handle padding of strings that are smaller than blocksize. Details on the padding scheme are provided in Alphabet.

The class contains algorithm-independent implementations of the following methods: engineEncrypt(String), engineDecrypt(String), engineEncryptFile(String, String), and engineDecryptFile(String,String).

Constructor Summary

BlockCipher()

Method Summary

Methods inherited from class hcrypto.cipher.CipherEngine

getAlphabetRangeOptions

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BlockCipher

public BlockCipher()