Quadcap Embeddable Database

com.quadcap.crypto.Tea256 Class Reference

Inheritance diagram for com.quadcap.crypto.Tea256:

List of all members.

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Detailed Description

Implementation of Tiny Encryption Algorithm, modified to use longs instead of ints.

SO the key is now four longs, or 256 bits, and the encryption/decryption proceeds 16 bytes at a time instead of 8.

The number of rounds has been retained at 32.

Author:

Stan Bailes

Definition at line 58 of file Tea256.java.

Public Member Functions
void	init (String s)
	Initialize key from serialized representation.
void	init (byte[] k)
void	init (Random r)
	Initialize: Create a random key.
String	toString ()
	Return the serialized form of the key.
void	encrypt (ByteBuffer plain, ByteBuffer code)
	Encrypt a buffer (must be multiple of 16 bytes).
void	decrypt (ByteBuffer code, ByteBuffer plain)
	Decrypt a buffer (must be a multiple of 16 bytes).
int	getBlockSize ()
	The key's block size.
Package Functions
final void	encrypt (long[] v)
final void	decrypt (long[] v)
Package Attributes
long	a
long	b
long	c
long	d
long[]	v = new long[2]
Static Package Attributes
final long	delta = 0x9E3779B97F4A7C15L
	Computed as (sqrt(5)-1) * 2**63, following original Tea choice of delta.
final int	rounds = 32

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Member Function Documentation

final void com.quadcap.crypto.Tea256.decrypt (  long[]  v  )  [package]

Definition at line 148 of file Tea256.java. References com.quadcap.crypto.Tea256.b, com.quadcap.crypto.Tea256.d, com.quadcap.crypto.Tea256.delta, and com.quadcap.crypto.Tea256.rounds.

void com.quadcap.crypto.Tea256.decrypt (  ByteBuffer  code, ByteBuffer  plain )  [virtual]

Decrypt a buffer (must be a multiple of 16 bytes). Implements com.quadcap.crypto.AbstractSymmetricKey. Definition at line 120 of file Tea256.java. References com.quadcap.crypto.Tea256.decrypt(), and com.quadcap.crypto.Tea256.v. Referenced by com.quadcap.crypto.Tea256.decrypt().

final void com.quadcap.crypto.Tea256.encrypt (  long[]  v  )  [package]

Definition at line 134 of file Tea256.java. References com.quadcap.crypto.Tea256.b, com.quadcap.crypto.Tea256.d, com.quadcap.crypto.Tea256.delta, and com.quadcap.crypto.Tea256.rounds.

void com.quadcap.crypto.Tea256.encrypt (  ByteBuffer  plain, ByteBuffer  code )  [virtual]

Encrypt a buffer (must be multiple of 16 bytes). Implements com.quadcap.crypto.AbstractSymmetricKey. Definition at line 105 of file Tea256.java. References com.quadcap.crypto.Tea256.encrypt(), and com.quadcap.crypto.Tea256.v. Referenced by com.quadcap.crypto.Tea256.encrypt().

int com.quadcap.crypto.Tea256.getBlockSize (   )  [virtual]

The key's block size. Implements com.quadcap.crypto.AbstractSymmetricKey. Definition at line 132 of file Tea256.java.

void com.quadcap.crypto.Tea256.init (  Random  r  )  [virtual]

Initialize: Create a random key. Implements com.quadcap.crypto.AbstractSymmetricKey. Definition at line 88 of file Tea256.java. References com.quadcap.crypto.Tea256.a, com.quadcap.crypto.Tea256.b, com.quadcap.crypto.Tea256.c, and com.quadcap.crypto.Tea256.d.

void com.quadcap.crypto.Tea256.init (  byte[]  k  )

Definition at line 78 of file Tea256.java. References com.quadcap.crypto.Tea256.a, com.quadcap.crypto.Tea256.b, com.quadcap.crypto.Tea256.c, and com.quadcap.crypto.Tea256.d.

void com.quadcap.crypto.Tea256.init (  String  s  )  [virtual]

Initialize key from serialized representation. Implements com.quadcap.crypto.AbstractSymmetricKey. Definition at line 70 of file Tea256.java. References com.quadcap.crypto.Tea256.a, com.quadcap.crypto.Tea256.b, com.quadcap.crypto.Tea256.c, com.quadcap.crypto.Tea256.d, and com.quadcap.crypto.Tea256.init(). Referenced by com.quadcap.crypto.KeyFactory.createSymmetricKey(), and com.quadcap.crypto.Tea256.init().

String com.quadcap.crypto.Tea256.toString (   )

Return the serialized form of the key. Implements com.quadcap.crypto.SymmetricKey. Definition at line 98 of file Tea256.java. References com.quadcap.crypto.Tea256.a, com.quadcap.crypto.Tea256.b, com.quadcap.crypto.Tea256.c, and com.quadcap.crypto.Tea256.d.

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Member Data Documentation

long com.quadcap.crypto.Tea256.a [package]

Definition at line 64 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.init(), and com.quadcap.crypto.Tea256.toString().

long com.quadcap.crypto.Tea256.b [package]

Definition at line 64 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.decrypt(), com.quadcap.crypto.Tea256.encrypt(), com.quadcap.crypto.Tea256.init(), and com.quadcap.crypto.Tea256.toString().

long com.quadcap.crypto.Tea256.c [package]

Definition at line 64 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.init(), and com.quadcap.crypto.Tea256.toString().

long com.quadcap.crypto.Tea256.d [package]

Definition at line 64 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.decrypt(), com.quadcap.crypto.Tea256.encrypt(), com.quadcap.crypto.Tea256.init(), and com.quadcap.crypto.Tea256.toString().

final long com.quadcap.crypto.Tea256.delta = 0x9E3779B97F4A7C15L [static, package]

Computed as (sqrt(5)-1) * 2**63, following original Tea choice of delta. Definition at line 61 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.decrypt(), and com.quadcap.crypto.Tea256.encrypt().

final int com.quadcap.crypto.Tea256.rounds = 32 [static, package]

Definition at line 62 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.decrypt(), and com.quadcap.crypto.Tea256.encrypt().

long [] com.quadcap.crypto.Tea256.v = new long[2] [package]

Definition at line 65 of file Tea256.java. Referenced by com.quadcap.crypto.Tea256.decrypt(), and com.quadcap.crypto.Tea256.encrypt().