Package com.mku.salmon.transform

Class SalmonAES256CTRTransformer

java.lang.Object

com.mku.salmon.transform.SalmonAES256CTRTransformer

All Implemented Interfaces:

ISalmonCTRTransformer

Direct Known Subclasses:

SalmonDefaultTransformer, SalmonNativeTransformer

public abstract class SalmonAES256CTRTransformer
extends Object
implements ISalmonCTRTransformer

Abstract class for AES256 transformer implementations.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	BLOCK_SIZE	Salmon stream encryption block size, same as AES.
static final int	EXPANDED_KEY_SIZE	Standard expansion key size for AES256 only.

Constructor Summary

Constructors

Constructor	Description
SalmonAES256CTRTransformer()

Method Summary

Modifier and Type	Method	Description
long	getBlock()	Get the current block.
byte[]	getCounter()	Get the current Counter.
protected byte[]	getExpandedKey()	Get the expanded key if available.
byte[]	getKey()	Get the current encryption key.
byte[]	getNonce()	Get the nonce (initial counter)
protected void	increaseCounter(long value)	Increase the Counter We use only big endianness for AES regardless of the machine architecture
void	init(byte[] key, byte[] nonce)	Initialize the transformer.
void	resetCounter()	Resets the Counter and the block count.
void	setExpandedKey(byte[] expandedKey)	Set the expanded key.
void	syncCounter(long position)	Syncs the Counter based on what AES block position the stream is at.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.mku.salmon.transform.ISalmonCTRTransformer

decryptData, encryptData

Field Details

EXPANDED_KEY_SIZE

public static final int EXPANDED_KEY_SIZE

Standard expansion key size for AES256 only.

See Also:

• Constant Field Values

BLOCK_SIZE

public static final int BLOCK_SIZE

Salmon stream encryption block size, same as AES.

See Also:

• Constant Field Values

Constructor Details

SalmonAES256CTRTransformer

public SalmonAES256CTRTransformer()

Method Details

resetCounter

public void resetCounter()

Resets the Counter and the block count.

Specified by:

resetCounter in interface ISalmonCTRTransformer

syncCounter

public void syncCounter(long position)

Syncs the Counter based on what AES block position the stream is at. The block count is already excluding the header and the hash signatures.

Specified by:

syncCounter in interface ISalmonCTRTransformer

Parameters:

position - The position to sync the counter to

increaseCounter

protected void increaseCounter(long value)

Increase the Counter We use only big endianness for AES regardless of the machine architecture

Parameters:

value - value to increase counter by

init

public void init(byte[] key,
 byte[] nonce)

Initialize the transformer. Most common operations include precalculating expansion keys or any other prior initialization for efficiency.

Specified by:

init in interface ISalmonCTRTransformer

Parameters:

key - The key

nonce - The nonce

Throws:

SalmonSecurityException - Thrown if there is a security exception

getCounter

public byte[] getCounter()

Get the current Counter.

Specified by:

getCounter in interface ISalmonCTRTransformer

Returns:

The current counter

getBlock

public long getBlock()

Get the current block.

Specified by:

getBlock in interface ISalmonCTRTransformer

Returns:

The current block

getKey

public byte[] getKey()

Get the current encryption key.

Specified by:

getKey in interface ISalmonCTRTransformer

Returns:

The encryption key

getExpandedKey

protected byte[] getExpandedKey()

Get the expanded key if available.

Returns:

The expanded key

getNonce

public byte[] getNonce()

Get the nonce (initial counter)

Specified by:

getNonce in interface ISalmonCTRTransformer

Returns:

The nonce

setExpandedKey

public void setExpandedKey(byte[] expandedKey)

Set the expanded key. This should be called once during initialization phase.

Parameters:

expandedKey - The expanded key