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java.lang.Objectorg.logi.crypto.Crypto
org.logi.crypto.modes.EncryptMode
org.logi.crypto.modes.EncryptCBC
Cipher Block Chaining mode xors each plain block with the previous cipher block before encrypting.
Because CBC mode encrypts one block at a time, encryption is only performed when a full block of data has been sent to the object. This also means that when you call the flush() method, random data is appended to the block before encryption. This can be avoided in two ways: Either by flushing regularly and sending the size of the data packets to the reciever, or by using the CFB of OFB modes.
DecryptCBC
Field Summary |
Fields inherited from class org.logi.crypto.Crypto |
BIT, cdsPath, EMPTY_ARRAY, FOUR, keySource, NIBBLE, ONE, primeCertainty, random, TWO, ZERO |
Constructor Summary | |
EncryptCBC()
Create a new CBC-mode encrypt session with no key. |
|
EncryptCBC(CipherKey key)
Create a new CBC-mode encrypt session with the specified key. |
Method Summary | |
byte[] |
encrypt(byte[] source,
int i,
int length)
Send bytes to the EncryptCBC 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 |
public EncryptCBC(CipherKey key)
public EncryptCBC()
setKey()
method has been called.
Method Detail |
public CipherKey getKey()
getKey
in class EncryptMode
public int plainBlockSize()
plainBlockSize
in class EncryptMode
public void setKey(CipherKey key)
setKey
in class EncryptMode
public byte[] flush()
flush
in class EncryptMode
public byte[] encrypt(byte[] source, int i, int length)
Encrypt length
bytes from source
,
starting at i
and return the ciphertext. Data is
encrypted in blocks, so only whole blocks of ciphertext
are written to dest
. Any remaining plaintext will be
stored and prepended to source
in the next call to
encrypt
.
encrypt
in class EncryptMode
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