Package 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
- Author:
- jrandom
-
Field Summary
Fields Modifier and Type Field Description static intDEFAULT_YK_PRECALC_DELAYstatic intDEFAULT_YK_PRECALC_MAXstatic intDEFAULT_YK_PRECALC_MINstatic StringPROP_YK_PRECALC_DELAYstatic StringPROP_YK_PRECALC_MAXstatic StringPROP_YK_PRECALC_MIN -
Constructor Summary
Constructors Constructor Description YKGenerator(I2PAppContext context)Caller must also call start() to start the background precalc thread. -
Method Summary
Modifier and Type Method Description BigInteger[]getNextYK()voidshutdown()Stop the background precalc thread.voidstart()Start the background precalc thread.
-
Field Details
-
PROP_YK_PRECALC_MIN
- See Also:
- Constant Field Values
-
PROP_YK_PRECALC_MAX
- See Also:
- Constant Field Values
-
PROP_YK_PRECALC_DELAY
- See Also:
- Constant Field Values
-
DEFAULT_YK_PRECALC_MIN
public static final int DEFAULT_YK_PRECALC_MIN- See Also:
- Constant Field Values
-
DEFAULT_YK_PRECALC_MAX
public static final int DEFAULT_YK_PRECALC_MAX- See Also:
- Constant Field Values
-
DEFAULT_YK_PRECALC_DELAY
public static final int DEFAULT_YK_PRECALC_DELAY- See Also:
- Constant Field Values
-
-
Constructor Details
-
YKGenerator
Caller must also call start() to start the background precalc thread. Unit tests will still work without calling start().
-
-
Method Details
-
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.- Since:
- 0.9.14
-
shutdown
public void shutdown()Stop the background precalc thread. Can be restarted. Not required for unit tests.- Since:
- 0.8.8
-
getNextYK
- Returns:
- rv[0] = Y; rv[1] = K
-