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

org.bouncycastle.crypto.prng

## Class EntropyUtil

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

-     public class EntropyUtil
      extends java.lang.Object

  Utility methods for making use of EntropySources.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `EntropyUtil()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static byte[]` | `generateSeed(EntropySource entropySource, int numBytes)` Generate numBytes worth of entropy from the passed in entropy source.

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

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

- - ### Constructor Detail

    - #### EntropyUtil

          public EntropyUtil()

  - ### Method Detail

    - #### generateSeed

          public static byte[] generateSeed(EntropySource entropySource,
                                            int numBytes)

      Generate numBytes worth of entropy from the passed in entropy source.
      Parameters:
        `entropySource` - the entropy source to request the data from.
        `numBytes` - the number of bytes of entropy requested.
      Returns:
        a byte array populated with the random data.