com.googlecode.jinahya.crypto

Class Ciphers

java.lang.Object

com.googlecode.jinahya.crypto.Ciphers

public class Ciphers
extends Object

A utility class for Ciphers.

Author:

Jin Kwon

Field Summary

Fields

Modifier and Type	Field and Description
static Map<String,List<Integer>>	SUPPORTED_TRANSFORMATIONS A map of transformations and lists of available key sizes that every implementation of the Java platform is required to support.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Ciphers() Creates a new instance.

Method Summary

Methods

Modifier and Type	Method and Description
static long	doFinal(Cipher cipher, InputStream input, OutputStream output, byte[] inbuf, long length) Updates and finishes a multi-part encryption or description operation.
static long	doFinal(Cipher cipher, ReadableByteChannel input, WritableByteChannel output, ByteBuffer inbuf, long length) Updates and finishes a multi-part encryption or description.

Methods inherited from class java.lang.Object

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

Field Detail

SUPPORTED_TRANSFORMATIONS

public static final Map<String,List<Integer>> SUPPORTED_TRANSFORMATIONS

A map of transformations and lists of available key sizes that every implementation of the Java platform is required to support.

Constructor Detail

Ciphers

protected Ciphers()

Creates a new instance.

Method Detail

doFinal

public static long doFinal(Cipher cipher,
           InputStream input,
           OutputStream output,
           byte[] inbuf,
           long length)
                    throws IOException,
                           IllegalBlockSizeException,
                           BadPaddingException

Updates and finishes a multi-part encryption or description operation.

Parameters:

cipher - the cipher

input - the input

output - the output

inbuf - the input buffer

length - the maximum number of bytes to process; any negative for all available bytes.

Returns:

the actual number of bytes processed

Throws:

IOException - if an I/O error occurs.

IllegalBlockSizeException - if this cipher is a block cipher, no padding has been requested (only in encryption mode), and the total input length of the data processed by this cipher is not a multiple of block size; or if this encryption algorithm is unable to process the input data provided. Description copied from Cipher.doFinal(byte[], int).

BadPaddingException - if this cipher is in decryption mode, and (un)padding has been requested, but the decrypted data is not bounded by the appropriate padding bytes. Description copied from Cipher.doFinal(byte[], int).

See Also:

Cipher.update(byte[], int, int, byte[], int), Cipher.doFinal(byte[], int)

doFinal

public static long doFinal(Cipher cipher,
           ReadableByteChannel input,
           WritableByteChannel output,
           ByteBuffer inbuf,
           long length)
                    throws IOException,
                           IllegalBlockSizeException,
                           BadPaddingException

Updates and finishes a multi-part encryption or description.

Parameters:

cipher - the cipher

input - the input

output - the output

inbuf - the input buffer

length - the maximum number of bytes to process; any negative for all available bytes.

Returns:

the actual number of bytes processed

Throws:

IOException - if an I/O error occurs

IllegalBlockSizeException - if this cipher is a block cipher, no padding has been requested (only in encryption mode), and the total input length of the data processed by this cipher is not a multiple of block size; or if this encryption algorithm is unable to process the input data provided. Description copied from Cipher.doFinal(java.nio.ByteBuffer, java.nio.ByteBuffer).

BadPaddingException - if there is insufficient space in the output buffer. Description copied from Cipher.doFinal(java.nio.ByteBuffer, java.nio.ByteBuffer).

See Also:

Cipher.update(java.nio.ByteBuffer, java.nio.ByteBuffer), Cipher.doFinal(java.nio.ByteBuffer, java.nio.ByteBuffer)