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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 and up.

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package org.bouncycastle.crypto.prng.drbg;

/**
 * Interface to SP800-90A deterministic random bit generators.
 */
public interface SP80090DRBG
{
    /**
     * Return the block size of the DRBG.
     *
     * @return the block size (in bits) produced by each round of the DRBG.
     */
    int getBlockSize();

    /**
     * Populate a passed in array with random data.
     *
     * @param output output array for generated bits.
     * @param additionalInput additional input to be added to the DRBG in this step.
     * @param predictionResistant true if a reseed should be forced, false otherwise.
     *
     * @return number of bits generated, -1 if a reseed required.
     */
    int generate(byte[] output, byte[] additionalInput, boolean predictionResistant);

    /**
     * Reseed the DRBG.
     *
     * @param additionalInput additional input to be added to the DRBG in this step.
     */
    void reseed(byte[] additionalInput);
}