ThreadedSeedGenerator (Bouncy Castle Library 1.85 API Specification)
Date: 2026-07-12

org.bouncycastle.crypto.prng

## Class ThreadedSeedGenerator

- java.lang.Object
- - org.bouncycastle.crypto.prng.ThreadedSeedGenerator

-     public class ThreadedSeedGenerator
      extends java.lang.Object

  A thread based seed generator - one source of randomness.

  Based on an idea from Marcus Lippert.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ThreadedSeedGenerator()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `byte[]` | `generateSeed(int numBytes, boolean fast)` Generate seed bytes.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### ThreadedSeedGenerator

          public ThreadedSeedGenerator()

  - ### Method Detail

    - #### generateSeed

          public byte[] generateSeed(int numBytes,
                                     boolean fast)

      Generate seed bytes. Set fast to false for best quality.

      If fast is set to true, the code should be round about 8 times faster when generating a long sequence of random bytes. 20 bytes of random values using the fast mode take less than half a second on a Nokia e70. If fast is set to false, it takes round about 2500 ms.

      Parameters:
        `numBytes` - the number of bytes to generate
        `fast` - true if fast mode should be used