Examples of Yarrow

freenet.crypt.Yarrow

An implementation of the Yarrow PRNG in Java.

This class implements Yarrow-160, a cryptraphically secure PRNG developed by John Kelsey, Bruce Schneier, and Neils Ferguson. It was designed to follow the specification (www.counterpane.com/labs) given in the paper by the same authors, with the following exceptions:

Instead of 3DES as the output cipher, Rijndael was chosen. It was my belief that an AES candidate should be selected. Twofish was an alternate choice, but the AES implementation does not allow easy selection of a faster key-schedule, so twofish's severely impaired performance.
h prime, described as a 'size adaptor' was not used, since its function is only to constrain the size of a byte array, our own key generation routine was used instead (See {@link freenet.crypt.Util#makeKey freenet.crypt.Util.makeKey})
Our own entropy estimation routines are used, as they use a third-order delta calculation that is quite conservative. Still, its used along side the global multiplier and program- supplied guesses, as suggested.

@author Scott G. Miller


      File seed = userDir.file("prng.seed");
      FileUtil.setOwnerRW(seed);
      entropyGatheringThread.start();
      // Can block.
      this.random = new Yarrow(seed);
      DiffieHellman.init(random);
      // http://bugs.sun.com/view_bug.do;jsessionid=ff625daf459fdffffffffcd54f1c775299e0?bug_id=4705093
      // This might block on /dev/random while doing new SecureRandom(). Once it's created, it won't block.
      ECDH.blockingInit();
    } else {

    }


    config.store();


    // TODO: find a smarter way of doing it not involving any casting
    Yarrow myRandom = (Yarrow) random;
    myRandom.write_seed(myRandom.seedfile, true);
  }

    // use dyndns hostnames
    java.security.Security.setProperty("networkaddress.cache.ttl", "0");
    java.security.Security.setProperty("networkaddress.cache.negative.ttl", "0");


    // Setup RNG
    RandomSource random = new Yarrow();


    DiffieHellman.init(random);


    if(enablePlug) {

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Examples of Yarrow

Examples of freenet.crypt.Yarrow

Examples of freenet.crypt.Yarrow

Examples of freenet.crypt.Yarrow