http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.crypto.prng;

import org.bouncycastle.crypto.prng.drbg.SP80090DRBG;

interface DRBGProvider
{
    SP80090DRBG get(EntropySource entropySource);
}