Class java.crypt.Blowfish
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Class java.crypt.Blowfish

java.crypt.BlockCipher
   |
   +----java.crypt.Blowfish

public final class Blowfish
extends BlockCipher
This class implements the Blowfish block cipher.

The native code Blowfish algoryth was developed by Bruce Schneier

The native code Blowfish implementation used by the class was developed by Bryan Olson from Bruce Schneier's code. The C source file is Copyright (C) 1995, A.M. Kuchling.

Copyright (C) 1995, 1996 Systemics Ltd (http://www.systemics.com/) All rights reserved.


Variable Index

 o BLOCK_LENGTH
This is the length of a block.

Constructor Index

 o Blowfish(byte[])
This creates a Blowfish block cipher from a byte array of a variable length.

Method Index

 o blockDecrypt(byte[], int, byte[], int)
Decrypt a block.
 o blockEncrypt(byte[], int, byte[], int)
Encrypt a block.
 o blockLength()
Return the block length of this cipher.
 o keyLength()
Return the key length for this cipher.

Variables

 o BLOCK_LENGTH
  public final static int BLOCK_LENGTH
This is the length of a block.

Constructors

 o Blowfish
  public Blowfish(byte userKey[])
This creates a Blowfish block cipher from a byte array of a variable length.
Parameters:
userKey - the user key.

Methods

 o blockEncrypt
  protected void blockEncrypt(byte in[],
                              int in_offset,
                              byte out[],
                              int out_offset)
Encrypt a block. The in and out buffers can be the same.
Parameters:
in - The data to be encrypted.
in_offset - The start of data within the in buffer.
out - The encrypted data.
out_offset - The start of data within the out buffer.
Overrides:
blockEncrypt in class BlockCipher
 o blockDecrypt
  protected void blockDecrypt(byte in[],
                              int in_offset,
                              byte out[],
                              int out_offset)
Decrypt a block. The in and out buffers can be the same.
Parameters:
in - The data to be decrypted.
in_offset - The start of data within the in buffer.
out - The decrypted data.
out_offset - The start of data within the out buffer.
Overrides:
blockDecrypt in class BlockCipher
 o blockLength
  public int blockLength()
Return the block length of this cipher.
Returns:
s the block length of this cipher.
Overrides:
blockLength in class BlockCipher
 o keyLength
  public int keyLength()
Return the key length for this cipher.
Returns:
s the length of the key used when constructing this cipher.
Overrides:
keyLength in class BlockCipher

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