Example usage for org.bouncycastle.crypto.prng.drbg HashSP800DRBG HashSP800DRBG

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.prng.drbg HashSP800DRBG HashSP800DRBG.

Prototype

public HashSP800DRBG(Digest digest, int securityStrength, EntropySource entropySource,
        byte[] personalizationString, byte[] nonce) 

Source Link

Document

Construct a SP800-90A Hash DRBG.

Usage

From source file:org.cryptacular.generator.sp80038d.RBGNonce.java

License:Open Source License

/**
 * Creates a new DRBG instance./*from   w  w  w .  j  a  va 2 s  .  c  o  m*/
 *
 * @param  length  Length in bits of values produced by DRBG.
 * @param  domain  Domain qualifier.
 *
 * @return  New DRBG instance.
 */
private static SP80090DRBG newRBG(final int length, final byte[] domain) {
    return new HashSP800DRBG(new SHA256Digest(), length, new EntropySource() {
        @Override
        public boolean isPredictionResistant() {
            return false;
        }

        @Override
        public byte[] getEntropy() {
            return NonceUtil.timestampNonce(length);
        }

        @Override
        public int entropySize() {
            return length;
        }
    }, domain, NonceUtil.timestampNonce(8));
}

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From source file:org.cryptacular.util.NonceUtil.java

License:Open Source License

/**
 * Creates a new hash-based DRBG instance that uses the given digest as the
 * pseudorandom source.//from  ww w. ja  va 2 s.  c o  m
 *
 * @param  digest  Digest algorithm.
 * @param  length  Length in bits of values to be produced by DRBG instance.
 *
 * @return  New DRGB instance.
 */
public static SP80090DRBG newRBG(final Digest digest, final int length) {
    return new HashSP800DRBG(digest, length, new EntropySource() {
        @Override
        public boolean isPredictionResistant() {
            return false;
        }

        @Override
        public byte[] getEntropy() {
            return NonceUtil.timestampNonce(length);
        }

        @Override
        public int entropySize() {
            return length;
        }
    }, null, NonceUtil.timestampNonce(8));
}

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From source file:org.cryptoworkshop.ximix.common.util.challenge.SeededChallenger.java

License:Apache License

/**
 * Base constructor.//w  w w. ja  va2  s  .  c om
 *
 * @param size the number of messages on the board we are issuing challenges on.
 * @param stepNo the number of the step in the shuffling process.
 * @param seed a random seed for creating index numbers to challenge on - must be at least 55 bytes.
 */
public SeededChallenger(Integer size, Integer stepNo, byte[] seed) {
    this.counter = 0;
    this.startIndex = 0;

    this.bitSet = buildBitSet(size, new HashSP800DRBG(new SHA256Digest(), 256,
            new SingleEntropySourceProvider(seed).get(440), null, null));
    this.isMirror = (((seed[seed.length - 1] & 0xff) + stepNo) & 0x01) == 0;
    this.max = (isMirror) ? (size - (size / 2)) : (size / 2);
}

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