Example usage for org.bouncycastle.crypto.prng RandomGenerator nextBytes

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.prng RandomGenerator nextBytes.

Prototype

void nextBytes(byte[] bytes);

Source Link

Document

Fill bytes with random values.

Usage

From source file:gnu.java.bigintcrypto.BigIntegerCrypto.java

License:Open Source License

private void init(int numBits, RandomGenerator rnd) {
    int highbits = numBits & 31;
    // minimum number of bytes to store the above number of bits
    int highBitByteCount = (highbits + 7) / 8;
    // number of bits to discard from the last byte
    int discardedBitCount = highbits % 8;
    if (discardedBitCount != 0)
        discardedBitCount = 8 - discardedBitCount;
    byte[] highBitBytes = new byte[highBitByteCount];
    if (highbits > 0) {
        rnd.nextBytes(highBitBytes);
        highbits = (highBitBytes[highBitByteCount - 1] & 0xFF) >>> discardedBitCount;
        for (int i = highBitByteCount - 2; i >= 0; i--)
            highbits = (highbits << 8) | (highBitBytes[i] & 0xFF);
    }/* ww w .j a  v a  2 s . c  om*/
    int nwords = numBits / 32;

    byte tmpBytes[] = new byte[4];
    while (highbits == 0 && nwords > 0) {
        rnd.nextBytes(tmpBytes);
        highbits = (byte) tmpBytes[0];
        highbits |= tmpBytes[1] << 8;
        highbits |= tmpBytes[2] << 16;
        highbits |= tmpBytes[3] << 24;
        --nwords;
    }
    if (nwords == 0 && highbits >= 0) {
        ival = highbits;
    } else {
        ival = highbits < 0 ? nwords + 2 : nwords + 1;
        words = new int[ival];
        words[nwords] = highbits;
        while (--nwords >= 0) {
            rnd.nextBytes(tmpBytes);
            words[nwords] = (byte) tmpBytes[0];
            words[nwords] |= tmpBytes[1] << 8;
            words[nwords] |= tmpBytes[2] << 16;
            words[nwords] |= tmpBytes[3] << 24;
        }
    }
}

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From source file:net.sourceforge.keepassj2me.keydb.KeydbDatabase.java

License:Open Source License

protected int getRandom() {
    byte[] id = new byte[4];
    RandomGenerator rnd = new DigestRandomGenerator(new SHA1Digest());
    rnd.addSeedMaterial(System.currentTimeMillis());
    rnd.nextBytes(id);
    return (id[0] | (id[1] << 8) | (id[2] << 16) | (id[3] << 24));
}

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From source file:net.sourceforge.keepassj2me.keydb.KeydbEntry.java

License:Open Source License

/**
 * Generate entry uuid/*  ww  w  . java  2 s .co  m*/
 * @return uuid
 */
public byte[] createUUID() {//FIXME: make sure this is unique
    byte[] uuid = new byte[16];
    RandomGenerator rnd = new DigestRandomGenerator(new SHA1Digest());
    rnd.addSeedMaterial(System.currentTimeMillis());
    rnd.nextBytes(uuid);
    return uuid;
}

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From source file:net.sourceforge.keepassj2me.keydb.KeydbHeader.java

License:Open Source License

/**
 * Reinitialize header//from w w w  . j  a v  a 2 s . co  m
 * @param rounds
 */
public void reinitialize(int rounds) {
    numKeyEncRounds = rounds;
    //SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
    //rnd.setSeed(System.currentTimeMillis());
    RandomGenerator rnd = new DigestRandomGenerator(new SHA1Digest());
    rnd.addSeedMaterial(System.currentTimeMillis());
    rnd.nextBytes(masterSeed);
    rnd.nextBytes(encryptionIV);
    rnd.nextBytes(masterSeed2);
}

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