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java.lang.Object | +--org.logi.crypto.Crypto | +--org.logi.crypto.modes.EncryptMode | +--org.logi.crypto.modes.EncryptCFB
This class implements 8-bit Cipherblock FeedBack mode which encrypts a whole block for each plaintext character. This makes it much slower than the ECB, CBC and OFB modes.
CFB mode is also inherently incompatible with probabilistic encryption algorithms such as ElGamal (implemented in the DHKey class) since it relies on the same keystream being gengerated by the encrypting and decrypting processes.
DecryptCFB
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. |
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EncryptCFB(CipherKey key)
Create a new CBF-mode encrypt session with the specified key. |
Method Summary | |
void |
close()
Close files and kill threads owned by the object. |
byte[] |
encrypt(byte[] source,
int i,
int length)
Send bytes to the EncryptCFB object for encryption. |
void |
finalize()
|
byte[] |
flush()
Pads the internal buffer, encrypts it and returns the ciphertext. |
byte[] |
flush(byte[] source,
int i,
int length)
Equivalent to calling encrypt(source,i,length)
followed by flush() . |
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.Crypto |
binString, binString, ensureArrayLength, ensureArrayLength, equal, equalRelaxed, equalSub, fromHexNibble, fromHexString, fromString, fromString, hexString, hexString, hexString, hexString, hexString, initRandom, initRandom, makeClass, makeInt, makeLong, makeSessionKey, pastSpace, pickBits, pickBits, prettyPrint, prettyPrint, readBlock, readInt, trimArrayLength, trimArrayLength, trimLeadingZeroes, writeBytes, writeBytes, writeInt |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public EncryptCFB(CipherKey key) throws KeyException
KeyException
- if key is a public key.public EncryptCFB()
setKey()
method has been called.Method Detail |
public CipherKey getKey()
public void setKey(CipherKey key) throws KeyException
KeyException
- if key is a public key.public int plainBlockSize()
public byte[] flush()
public byte[] encrypt(byte[] source, int i, int length)
Encrypt length
bytes from source
,
starting at i
and return the ciphertext.
public byte[] flush(byte[] source, int i, int length)
encrypt(source,i,length)
followed by flush()
.flush
in interface EncryptSession
public void close()
EncryptSession
close
in interface EncryptSession
public void finalize()
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