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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.jcajce.provider.drbg;

import org.bouncycastle.crypto.prng.EntropySource;

interface IncrementalEntropySource
    extends EntropySource
{
    /**
     * Pause allows for a gap between fetches. We only want this after we've initialised.
     *
     * @param pause time in milliseconds to pause in build up seed.
     * @return the resulting seed
     */
    byte[] getEntropy(long pause)
        throws InterruptedException;
}