Java Doc for DES.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » crypto » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.crypto 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.sun.midp.crypto.Cipher
      com.sun.midp.crypto.DES

All known Subclasses:   com.sun.midp.crypto.DESEDE,
DES
public class DES extends Cipher (Code)
Wrapper for all DES cipher classes.


Field Summary
 Ciphercipher
    

Constructor Summary
public  DES()
     Public by name constructor.

Method Summary
public  intdoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
     Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
public  byte[]getIV()
     Returns the initialization vector (IV) in a new buffer.
public  voidinit(int opmode, Key key, CryptoParameter params)
     Initializes this cipher with a key and a set of algorithm parameters.

The cipher is initialized for one of the following operations: encryption or decryption depending on the value of opmode.

If this cipher requires any algorithm parameters and params is null, the underlying cipher implementation is supposed to generate the required parameters itself (using provider-specific default or random values) if it is being initialized for encryption, and raise an InvalidAlgorithmParameterException if it is being initialized for decryption.

Note that when a Cipher object is initialized, it loses all previously-acquired state.

protected  voidsetChainingModeAndPadding(String mode, String padding)
     Called by the factory method to set the mode and padding parameters.
public  intupdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
     Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, are processed, and the result is stored in the output buffer, starting at outputOffset inclusive.

If the output buffer is too small to hold the result, a ShortBufferException is thrown.


Field Detail
cipher
Cipher cipher(Code)




Constructor Detail
DES
public DES()(Code)
Public by name constructor.




Method Detail
doFinal
public int doFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws IllegalStateException, ShortBufferException, IllegalBlockSizeException, BadPaddingException(Code)
Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. The data is encrypted or decrypted, depending on how this cipher was initialized.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, and any input bytes that may have been buffered during a previous update operation, are processed, with padding (if requested) being applied. The result is stored in the output buffer, starting at outputOffset inclusive.

If the output buffer is too small to hold the result, a ShortBufferException is thrown. In this case, repeat this call with a larger output buffer.

Upon finishing, this method resets this cipher object to the state it was in when previously initialized via a call to init. That is, the object is reset and available to encrypt or decrypt (depending on the operation mode that was specified in the call to init) more data.

Note: if any exception is thrown, this cipher object may need to be reset before it can be used again.

Note: this method should be copy-safe, which means the input and output buffers can reference the same byte array and no unprocessed input data is overwritten when the result is copied into the output buffer.
Parameters:
  input - the input buffer
Parameters:
  inputOffset - the offset in input where the inputstarts
Parameters:
  inputLen - the input length
Parameters:
  output - the buffer for the result
Parameters:
  outputOffset - the offset in output where the resultis stored the number of bytes stored in output
exception:
  IllegalStateException - if this cipher is in a wrong state(e.g., has not been initialized)
exception:
  IllegalBlockSizeException - if this cipher is a block cipher,no padding has been requested (only in encryption mode), and the totalinput length of the data processed by this cipher is not a multiple ofblock size
exception:
  ShortBufferException - if the given output buffer is too smallto hold the result
exception:
  BadPaddingException - if this cipher is in decryption mode,and (un)padding has been requested, but the decrypted data is notbounded by the appropriate padding bytes




getIV
public byte[] getIV()(Code)
Returns the initialization vector (IV) in a new buffer. This is useful in the case where a random IV was created. the initialization vector in a new buffer,or null if the underlying algorithm doesnot use an IV, or if the IV has not yet been set.



init
public void init(int opmode, Key key, CryptoParameter params) throws InvalidKeyException, InvalidAlgorithmParameterException(Code)
Initializes this cipher with a key and a set of algorithm parameters.

The cipher is initialized for one of the following operations: encryption or decryption depending on the value of opmode.

If this cipher requires any algorithm parameters and params is null, the underlying cipher implementation is supposed to generate the required parameters itself (using provider-specific default or random values) if it is being initialized for encryption, and raise an InvalidAlgorithmParameterException if it is being initialized for decryption.

Note that when a Cipher object is initialized, it loses all previously-acquired state. In other words, initializing a Cipher is equivalent to creating a new instance of that Cipher and initializing it.
Parameters:
  opmode - the operation mode of this cipher (this is one of thefollowing:ENCRYPT_MODE or DECRYPT_MODE)
Parameters:
  key - the encryption key
Parameters:
  params - the algorithm parameters
exception:
  InvalidKeyException - if the given key is inappropriate forinitializing this cipher, or its keysize exceeds the maximum allowablekeysize.
exception:
  InvalidAlgorithmParameterException - if the given algorithmparameters are inappropriate for this cipher,or this cipher is being initialized for decryption and requiresalgorithm parameters and params is null, or the givenalgorithm parameters imply a cryptographic strength that would exceedthe legal limits.




setChainingModeAndPadding
protected void setChainingModeAndPadding(String mode, String padding) throws NoSuchPaddingException(Code)
Called by the factory method to set the mode and padding parameters. Need because Class.newInstance does not take args.
Parameters:
  mode - the mode parsed from the transformation parameter ofgetInstance
Parameters:
  padding - the paddinge parsed from the transformation parameter ofgetInstance
exception:
  NoSuchPaddingException - if transformationcontains a padding scheme that is not available.



update
public int update(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws IllegalStateException, ShortBufferException(Code)
Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, are processed, and the result is stored in the output buffer, starting at outputOffset inclusive.

If the output buffer is too small to hold the result, a ShortBufferException is thrown. In this case, repeat this call with a larger output buffer.

If inputLen is zero, this method returns a length of zero.

Note: this method should be copy-safe, which means the input and output buffers can reference the same byte array and no unprocessed input data is overwritten when the result is copied into the output buffer.
Parameters:
  input - the input buffer
Parameters:
  inputOffset - the offset in input where the inputstarts
Parameters:
  inputLen - the input length
Parameters:
  output - the buffer for the result
Parameters:
  outputOffset - the offset in output where the resultis stored the number of bytes stored in output
exception:
  IllegalStateException - if this cipher is in a wrong state(e.g., has not been initialized)
exception:
  ShortBufferException - if the given output buffer is too smallto hold the result




Fields inherited from com.sun.midp.crypto.Cipher
final public static int DECRYPT_MODE(Code)(Java Doc)
final public static int ENCRYPT_MODE(Code)(Java Doc)
final protected static int MODE_UNINITIALIZED(Code)(Java Doc)

Methods inherited from com.sun.midp.crypto.Cipher
abstract public int doFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws IllegalStateException, ShortBufferException, IllegalBlockSizeException, BadPaddingException(Code)(Java Doc)
public byte[] getIV()(Code)(Java Doc)
final public static Cipher getInstance(String transformation) throws NoSuchAlgorithmException, NoSuchPaddingException(Code)(Java Doc)
public void init(int opmode, Key key) throws InvalidKeyException(Code)(Java Doc)
abstract public void init(int opmode, Key key, CryptoParameter params) throws InvalidKeyException, InvalidAlgorithmParameterException(Code)(Java Doc)
abstract protected void setChainingModeAndPadding(String mode, String padding) throws NoSuchPaddingException(Code)(Java Doc)
abstract public int update(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws IllegalStateException, ShortBufferException(Code)(Java Doc)

Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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