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Class java.security.Padding 

java.lang.Object
   |
   +----java.security.Padding
public abstract class Padding
extends Object
ATTENTION:

This is NOT the implementation from Sun. This class has been developed by IAIK according to the documentation publically available. Only the documentation from Sun has been inserted into the source files.

This interface is implemented by classes that provide a general-purpose padding scheme, such as the one described in PKCS#5 or in RFC 1423 (PEM).

Constructor Index

o Padding()

Method Index

o getName()
o pad(byte[])
Returns the padded array for a given array.
o pad(byte[], int, int)
Returns the padding for a given array of bytes.
o paddingScheme()
Returns the standard name of the padding scheme implemented.
o padLength(int)
Returns the absolute value of the increase in size which a padding operation would cause on input data of a given length.
o unpad(byte[])
Returns the unpadded array.
o unpad(byte[], int, int)
Given the specified subarray of bytes that includes padding bytes, returns the length of the unpadded message.

Constructors

o Padding 
 public Padding()

Methods

o pad 
 public abstract int pad(byte in[],
                         int off,
                         int len)
Returns the padding for a given array of bytes. The padded bytes are written to the same buffer that is used for input ("in").

Parameters:
in - - the buffer to pad.
off - - the offset into the in buffer of the first byte in the group of bytes to be padded.
len - - the number of bytes from the in buffer, starting at off, that need to be padded.
Returns:
the number of padding bytes written to out.
o unpad 
 public abstract int unpad(byte in[],
                           int off,
                           int len)
Given the specified subarray of bytes that includes padding bytes, returns the length of the unpadded message.

Parameters:
in - - the buffer containing the bytes.
off - - the starting offset in the in buffer of the bytes to be checked to determine where padding starts.
len - - the number of bytes from the in buffer to check, starting at offset off.
Returns:
the length of the unpadded message.
o padLength 
 public abstract int padLength(int len)
Returns the absolute value of the increase in size which a padding operation would cause on input data of a given length.

Parameters:
len - - the length of the data which is to be padded.
Returns:
the absolute value of the increase in size which a padding operation would cause on input data of the specified length.
o paddingScheme 
 public abstract String paddingScheme()
Returns the standard name of the padding scheme implemented. See Appendix A in the Java Cryptography Extension API Specification & Reference for more information about standard names for padding schemes.

Returns:
the standard name of the padding scheme, such as "PKCS#5".
o getName 
 public abstract String getName()
o pad 
 public byte[] pad(byte in[])
Returns the padded array for a given array. ATTENTION: This method is not defined in the sun java.security.Padding interface but useful.

Parameters:
in - the array to pad
Returns:
the padded array
o unpad 
 public byte[] unpad(byte in[])
Returns the unpadded array. ATTENTION: This method is not defined in the sun java.security.Padding interface but useful.

Parameters:
in - the padded array
Returns:
the unpadded array 
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