org.logi.crypto.modes
Class EncryptCFB

java.lang.Object
  org.logi.crypto.Crypto
      org.logi.crypto.modes.EncryptMode
          org.logi.crypto.modes.EncryptCFB

public class EncryptCFB

extends EncryptMode

This class implements 8-bit Cipherblock FeedBack mode which encrypts a whole block for each plaintext character. This makes it much slower than ECB or CBC mode, but it can be used for streaming and no garbage is ever inserted.

See Also:

DecryptCFB

Field Summary

Fields inherited from class org.logi.crypto.Crypto

BIT, cdsPath, EMPTY_ARRAY, FOUR, keySource, NIBBLE, ONE, primeCertainty, random, TWO, ZERO

Constructor Summary

EncryptCFB()
Create a new CBF-mode encrypt session with no key.

EncryptCFB(CipherKey key)
Create a new CBF-mode encrypt session with the specified key.

Method Summary

byte[]	encrypt(byte[] source, int i, int length) Send bytes to the EncryptCFB object for encryption.
byte[]	flush() Pads the internal buffer, encrypts it and returns the ciphertext.
CipherKey	getKey() Return the key used for encryption.
int	plainBlockSize() Return the size of the blocks of plaintext encrypted by this object.
void	setKey(CipherKey key) Set the key to use for encryption.

Methods inherited from class org.logi.crypto.modes.EncryptMode

close, finalize, flush

Methods inherited from class org.logi.crypto.Crypto

binString, binString, equal, equalRelaxed, equalSub, fromHexNibble, fromHexString, fromString, fromString, hexString, hexString, hexString, hexString, hexString, initRandom, initRandom, makeClass, makeInt, makeLong, makeSessionKey, pastSpace, pickBits, pickBits, readBlock, readInt, writeBytes, writeBytes, writeInt

Methods inherited from class java.lang.Object

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

Constructor Detail

EncryptCFB

public EncryptCFB(CipherKey key)

Create a new CBF-mode encrypt session with the specified key.

EncryptCFB

public EncryptCFB()

Create a new CBF-mode encrypt session with no key. No encryption can be performed until the setKey() method has been called.

Method Detail

getKey

public CipherKey getKey()

Return the key used for encryption.

Specified by:

getKey in class EncryptMode

setKey

public void setKey(CipherKey key)

Set the key to use for encryption. The key can only be set once in this version of the library. The 1.1.x and eventually 1.2.x series allows dynamic re-keying.

Specified by:

setKey in class EncryptMode

plainBlockSize

public int plainBlockSize()

Return the size of the blocks of plaintext encrypted by this object.

Specified by:

plainBlockSize in class EncryptMode

flush

public byte[] flush()

Pads the internal buffer, encrypts it and returns the ciphertext. Since CBF mode doesn't use an internal buffer, an empty array is returned.

Specified by:

flush in class EncryptMode

encrypt

public byte[] encrypt(byte[] source,
                      int i,
                      int length)

Send bytes to the EncryptCFB object for encryption.

Encrypt length bytes from source, starting at i and return the ciphertext.

Specified by:

encrypt in class EncryptMode