Rijndael_Algorithm Class Reference

Rijndael –pronounced Reindaal– is a variable block-size (128-, 192- and 256-bit), variable key-size (128-, 192- and 256-bit) symmetric cipher. More...

Collaboration diagram for Rijndael_Algorithm:

Static Public Member Functions
static Object	makeKey (byte[] k) throws InvalidKeyException
	Convenience method to expand a user-supplied key material into a session key, assuming Rijndael's default block size (128-bit). More...
static byte []	blockEncrypt (byte[] in, int inOffset, Object sessionKey)
	Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit). More...
static byte []	blockDecrypt (byte[] in, int inOffset, Object sessionKey)
	Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit). More...
static boolean	self_test ()
	A basic symmetric encryption/decryption test. More...
static int	blockSize ()
static synchronized Object	makeKey (byte[] k, int blockSize) throws InvalidKeyException
	Expand a user-supplied key material into a session key. More...
static byte []	blockEncrypt (byte[] in, int inOffset, Object sessionKey, int blockSize)
	Encrypt exactly one block of plaintext. More...
static byte []	blockDecrypt (byte[] in, int inOffset, Object sessionKey, int blockSize)
	Decrypt exactly one block of ciphertext. More...
static int	getRounds (int keySize, int blockSize)
	Return The number of rounds for a given Rijndael's key and block sizes. More...
static void	main (String[] args)

Static Package Functions
static void	debug (String s)
static void	trace (boolean in, String s)
static void	trace (String s)
	[static initializer]
static final int	mul (int a, int b)
static final int	mul4 (int a, byte[] b)

Static Package Attributes
static final String	NAME = "Rijndael_Algorithm"
static final boolean	IN = true
static final boolean	OUT = false
static final boolean	DEBUG = Rijndael_Properties.GLOBAL_DEBUG
static final int	debuglevel = DEBUG ? Rijndael_Properties.getLevel(NAME) : 0
static final PrintWriter	err = DEBUG ? Rijndael_Properties.getOutput() : null
static final boolean	TRACE = Rijndael_Properties.isTraceable(NAME)
static final int	BLOCK_SIZE = 16
static final int []	alog = new int[256]
static final int []	log = new int[256]
static final byte []	S = new byte[256]
static final byte []	Si = new byte[256]
static final int []	T1 = new int[256]
static final int []	T2 = new int[256]
static final int []	T3 = new int[256]
static final int []	T4 = new int[256]
static final int []	T5 = new int[256]
static final int []	T6 = new int[256]
static final int []	T7 = new int[256]
static final int []	T8 = new int[256]
static final int []	U1 = new int[256]
static final int []	U2 = new int[256]
static final int []	U3 = new int[256]
static final int []	U4 = new int[256]
static final byte []	rcon = new byte[30]
static final int [][][]	shifts

Detailed Description

Rijndael –pronounced Reindaal– is a variable block-size (128-, 192- and 256-bit), variable key-size (128-, 192- and 256-bit) symmetric cipher.

Rijndael was written by Vincent Rijmen and Joan Daemen.

Portions of this code are Copyright © 1997, 1998 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

Revision

Author

Raif S. Naffah

Paulo S. L. M. Barreto

Member Function Documentation

blockDecrypt() [1/2]

static byte [] blockDecrypt ( byte []  in, int  inOffset, Object  sessionKey  )

static

Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).

Parameters

in	The ciphertext.
inOffset	Index of in from which to start considering data.
sessionKey	The session key to use for decryption.

Returns

The plaintext generated from a ciphertext using the session key.

blockDecrypt() [2/2]

static byte [] blockDecrypt ( byte []  in, int  inOffset, Object  sessionKey, int  blockSize  )

static

Decrypt exactly one block of ciphertext.

Parameters

in	The ciphertext.
inOffset	Index of in from which to start considering data.
sessionKey	The session key to use for decryption.
blockSize	The block size in bytes of this Rijndael.

Returns

The plaintext generated from a ciphertext using the session key.

blockEncrypt() [1/2]

static byte [] blockEncrypt ( byte []  in, int  inOffset, Object  sessionKey  )

static

Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).

Parameters

in	The plaintext.
inOffset	Index of in from which to start considering data.
sessionKey	The session key to use for encryption.

Returns

The ciphertext generated from a plaintext using the session key.

blockEncrypt() [2/2]

static byte [] blockEncrypt ( byte []  in, int  inOffset, Object  sessionKey, int  blockSize  )

static

Encrypt exactly one block of plaintext.

Parameters

in	The plaintext.
inOffset	Index of in from which to start considering data.
sessionKey	The session key to use for encryption.
blockSize	The block size in bytes of this Rijndael.

Returns

The ciphertext generated from a plaintext using the session key.

blockSize()

static int blockSize ( )

static

Returns

The default length in bytes of the Algorithm input block.

getRounds()

static int getRounds ( int  keySize, int  blockSize  )

static

Return The number of rounds for a given Rijndael's key and block sizes.

Parameters

keySize	The size of the user key material in bytes.
blockSize	The desired block size in bytes.

Returns

The number of rounds for a given Rijndael's key and block sizes.

makeKey() [1/2]

static Object makeKey ( byte []  k ) throws InvalidKeyException

static

Convenience method to expand a user-supplied key material into a session key, assuming Rijndael's default block size (128-bit).

Parameters

key	The 128/192/256-bit user-key to use.

Exceptions

InvalidKeyException

If the key is invalid.

makeKey() [2/2]

static synchronized Object makeKey ( byte []  k, int  blockSize  ) throws InvalidKeyException

static

Expand a user-supplied key material into a session key.

Parameters

key	The 128/192/256-bit user-key to use.
blockSize	The block size in bytes of this Rijndael.

Exceptions

InvalidKeyException

If the key is invalid.

self_test()

static boolean self_test ( )

static

A basic symmetric encryption/decryption test.

Member Data Documentation

shifts

final int [][][] shifts

staticpackage

Initial value:

= new int[][][] {
        { {0, 0}, {1, 3}, {2, 2}, {3, 1} },
        { {0, 0}, {1, 5}, {2, 4}, {3, 3} },
        { {0, 0}, {1, 7}, {3, 5}, {4, 4} }
    }

---

The documentation for this class was generated from the following file:

• Rijndael_Algorithm.java