memetic.crypto
Class DESCrypt

java.lang.Object
  memetic.crypto.DESCrypt

All Implemented Interfaces:

Crypt

public class DESCrypt
extends java.lang.Object
implements Crypt

Encrypts and Decrypts using the DES Algorithm

Version:

1-1-alpha3

Author:

Andrew G D Rowley

Field Summary

static java.lang.String

TYPE The DES encryption type

Constructor Summary

DESCrypt(java.lang.String password)
Creates a new DESCrypt

Method Summary

int	decrypt(byte[] input, int offset, int length, byte[] output, int outOffset) Decrypts the input
int	encrypt(byte[] input, int offset, int length, byte[] output, int outOffset) Encrypts the input
int	getBlockSize() Returns the size of the block of the encryption or decryption
int	getDecryptOutputSize(int inputSize) Returns the maximum size the output buffer needs to be
int	getEncryptOutputSize(int inputSize) Returns the maximum size the output buffer needs to be

Methods inherited from class java.lang.Object

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

Field Detail

TYPE

public static final java.lang.String TYPE

The DES encryption type

See Also:

Constant Field Values

Constructor Detail

DESCrypt

public DESCrypt(java.lang.String password)

Creates a new DESCrypt

Parameters:

password - The password to crypt with

Method Detail

encrypt

public int encrypt(byte[] input,
                   int offset,
                   int length,
                   byte[] output,
                   int outOffset)
            throws javax.crypto.ShortBufferException,
                   javax.crypto.IllegalBlockSizeException,
                   javax.crypto.BadPaddingException

Description copied from interface: Crypt

Encrypts the input

Specified by:

encrypt in interface Crypt

Parameters:

input - The input to be encrypted

offset - The offset into the input buffer where the input starts

length - The length of the input

output - The output buffer

outOffset - The offset into the output buffer where to store the output

Returns:

The length of the output stored in the output buffer

Throws:

javax.crypto.BadPaddingException

javax.crypto.IllegalBlockSizeException

javax.crypto.ShortBufferException

java.security.InvalidAlgorithmParameterException

java.security.InvalidKeyException

See Also:

Crypt.encrypt(byte[], int, int, byte[], int)

decrypt

public int decrypt(byte[] input,
                   int offset,
                   int length,
                   byte[] output,
                   int outOffset)
            throws javax.crypto.ShortBufferException,
                   javax.crypto.IllegalBlockSizeException,
                   javax.crypto.BadPaddingException

Description copied from interface: Crypt

Decrypts the input

Specified by:

decrypt in interface Crypt

Parameters:

input - The input to be decrypted

offset - The offset into the input buffer where the input starts

length - The length of the input

output - The output buffer

outOffset - The offset into the output buffer where to store the output

Returns:

The length of the output stored in the output buffer

Throws:

javax.crypto.BadPaddingException

javax.crypto.IllegalBlockSizeException

javax.crypto.ShortBufferException

java.security.InvalidAlgorithmParameterException

java.security.InvalidKeyException

See Also:

Crypt.decrypt(byte[], int, int, byte[], int)

getEncryptOutputSize

public int getEncryptOutputSize(int inputSize)

Description copied from interface: Crypt

Returns the maximum size the output buffer needs to be

Specified by:

getEncryptOutputSize in interface Crypt

Parameters:

inputSize - The size of the input to be encrypted

Returns:

The maximum size of the output buffer

See Also:

Crypt.getEncryptOutputSize(int)

getDecryptOutputSize

public int getDecryptOutputSize(int inputSize)

Description copied from interface: Crypt

Returns the maximum size the output buffer needs to be

Specified by:

getDecryptOutputSize in interface Crypt

Parameters:

inputSize - The size of the input to be decrypted

Returns:

The maximum size of the output buffer

See Also:

Crypt.getDecryptOutputSize(int)

getBlockSize

public int getBlockSize()

Description copied from interface: Crypt

Returns the size of the block of the encryption or decryption

Specified by:

getBlockSize in interface Crypt

Returns:

The block size (in bytes)

See Also:

Crypt.getBlockSize()