net.i2p.crypto

Class YKGenerator

java.lang.Object

net.i2p.crypto.YKGenerator

final class YKGenerator
extends Object

Precalculate the Y and K for ElGamal encryption operations. This class precalcs a set of values on its own thread, using those transparently when a new instance is created. By default, the minimum threshold for creating new values for the pool is 20, and the max pool size is 50. Whenever the pool has less than the minimum, it fills it up again to the max. There is a delay after each precalculation so that the CPU isn't hosed during startup. These three parameters are controlled by java environmental variables and can be adjusted via: -Dcrypto.yk.precalc.min=40 -Dcrypto.yk.precalc.max=100 -Dcrypto.yk.precalc.delay=60000 (delay is milliseconds) To disable precalculation, set min to 0

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_YK_PRECALC_DELAY
static int	DEFAULT_YK_PRECALC_MAX
static int	DEFAULT_YK_PRECALC_MIN
static String	PROP_YK_PRECALC_DELAY
static String	PROP_YK_PRECALC_MAX
static String	PROP_YK_PRECALC_MIN

Constructor Summary

Constructors

Constructor and Description
YKGenerator(I2PAppContext context) Caller must also call start() to start the background precalc thread.

Method Summary

Modifier and Type	Method and Description
BigInteger[]	getNextYK() Gets the next YK value.
void	shutdown() Stop the background precalc thread.
void	start() Start the background precalc thread.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_YK_PRECALC_DELAY

public static final int DEFAULT_YK_PRECALC_DELAY

DEFAULT_YK_PRECALC_MAX

public static final int DEFAULT_YK_PRECALC_MAX

DEFAULT_YK_PRECALC_MIN

public static final int DEFAULT_YK_PRECALC_MIN

PROP_YK_PRECALC_DELAY

public static final String PROP_YK_PRECALC_DELAY

See Also:

Constant Field Values

PROP_YK_PRECALC_MAX

public static final String PROP_YK_PRECALC_MAX

See Also:

Constant Field Values

PROP_YK_PRECALC_MIN

public static final String PROP_YK_PRECALC_MIN

See Also:

Constant Field Values

Constructor Detail

YKGenerator

public YKGenerator(I2PAppContext context)

Caller must also call start() to start the background precalc thread. Unit tests will still work without calling start().

Method Detail

getNextYK

public BigInteger[] getNextYK()

Gets the next YK value.

Returns:

rv[0] = Y; rv[1] = K

shutdown

public void shutdown()

Stop the background precalc thread. Can be restarted. Not required for unit tests.

start

public void start()

Start the background precalc thread. Must be called for normal operation. If not called, all generation happens in the foreground. Not required for unit tests.