YKGenerator (Javadocs [I2P+ 2.13.0+]

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` Default delay between precalc operations (ms)
`static int`	`DEFAULT_YK_PRECALC_MAX` Default maximum pool size
`static int`	`DEFAULT_YK_PRECALC_MIN` Default minimum pool threshold
`static String`	`PROP_YK_PRECALC_DELAY` Property: delay between precalc operations (ms)
`static String`	`PROP_YK_PRECALC_MAX` Property: maximum pool size
`static String`	`PROP_YK_PRECALC_MIN` Property: minimum pool threshold

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

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`BigInteger[]`	`getNextYK()` Next precomputed 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 delay between precalc operations (ms)
  - DEFAULT_YK_PRECALC_MAX
```
public static final int DEFAULT_YK_PRECALC_MAX
```
    Default maximum pool size
  - DEFAULT_YK_PRECALC_MIN
```
public static final int DEFAULT_YK_PRECALC_MIN
```
    Default minimum pool threshold
  - PROP_YK_PRECALC_DELAY
```
public static final String PROP_YK_PRECALC_DELAY
```
    Property: delay between precalc operations (ms)
    See Also:
    Constant Field Values
  - PROP_YK_PRECALC_MAX
```
public static final String PROP_YK_PRECALC_MAX
```
    Property: maximum pool size
    See Also:
    Constant Field Values
  - PROP_YK_PRECALC_MIN
```
public static final String PROP_YK_PRECALC_MIN
```
    Property: minimum pool threshold
    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()
```
    Next precomputed 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.

Class YKGenerator

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_YK_PRECALC_DELAY

DEFAULT_YK_PRECALC_MAX

DEFAULT_YK_PRECALC_MIN

PROP_YK_PRECALC_DELAY

PROP_YK_PRECALC_MAX

PROP_YK_PRECALC_MIN

Constructor Detail

YKGenerator

Method Detail

getNextYK

shutdown

start