Package java.security

Examples of java.security.SecureRandom.nextInt()

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    public void testSetContentFromStream() throws Exception {
        Random random = new SecureRandom();

        for (int i = 0; i < 20; i++) {
            // Generate input data bytes.
            int size = random.nextInt(Short.MAX_VALUE);
            byte[] bytes = new byte[size];

            random.nextBytes(bytes);

            // Generate parsed HTTP data block.
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        while (true) {
            int[] seed = new int[5];

            for (int i = 0; i < 5; i++)
                seed[i] = random.nextInt();
            k = generateK(seed, q);
            if (k.signum() > 0 && k.compareTo(q) < 0) {
                previousKseed = new int [seed.length];
                System.arraycopy(seed, 0, previousKseed, 0, seed.length);
                return k;
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  public static GUID generateRandom(int length, CharacterSet charSet) {
    final StringBuilder builder = new StringBuilder();
    final SecureRandom rng = new SecureRandom();

    for (int i = 0; i < length; i++) {
      builder.append(charSet.getCharacter(rng.nextInt(charSet.length())));
    }

    return new GUID(builder.toString());
  }
 
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            // Nothing works - use platform default
            result = new SecureRandom();
        }

        // Force seeding to take place
        result.nextInt();

        long t2 = System.currentTimeMillis();
        if ((t2 - t1) > 100)
        {
            if (log.isLoggable(Level.FINEST))
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                break;
               
            case HASH_METHOD_CRYPT:
                salt = new byte[2];
                SecureRandom sr = new SecureRandom();
                int i1 = sr.nextInt( 64 );
                int i2 = sr.nextInt( 64 );

                salt[0] = ( byte ) ( i1 < 12 ? ( i1 + '.' ) : i1 < 38 ? ( i1 + 'A' - 12 ) : ( i1 + 'a' - 38 ) );
                salt[1] = ( byte ) ( i2 < 12 ? ( i2 + '.' ) : i2 < 38 ? ( i2 + 'A' - 12 ) : ( i2 + 'a' - 38 ) );
                break;
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            case HASH_METHOD_CRYPT:
                salt = new byte[2];
                SecureRandom sr = new SecureRandom();
                int i1 = sr.nextInt( 64 );
                int i2 = sr.nextInt( 64 );

                salt[0] = ( byte ) ( i1 < 12 ? ( i1 + '.' ) : i1 < 38 ? ( i1 + 'A' - 12 ) : ( i1 + 'a' - 38 ) );
                salt[1] = ( byte ) ( i2 < 12 ? ( i2 + '.' ) : i2 < 38 ? ( i2 + 'A' - 12 ) : ( i2 + 'a' - 38 ) );
                break;
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                break;

            case HASH_METHOD_CRYPT:
                salt = new byte[2];
                SecureRandom sr = new SecureRandom();
                int i1 = sr.nextInt( 64 );
                int i2 = sr.nextInt( 64 );

                salt[0] = ( byte ) ( i1 < 12 ? ( i1 + '.' ) : i1 < 38 ? ( i1 + 'A' - 12 ) : ( i1 + 'a' - 38 ) );
                salt[1] = ( byte ) ( i2 < 12 ? ( i2 + '.' ) : i2 < 38 ? ( i2 + 'A' - 12 ) : ( i2 + 'a' - 38 ) );
                break;
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            case HASH_METHOD_CRYPT:
                salt = new byte[2];
                SecureRandom sr = new SecureRandom();
                int i1 = sr.nextInt( 64 );
                int i2 = sr.nextInt( 64 );

                salt[0] = ( byte ) ( i1 < 12 ? ( i1 + '.' ) : i1 < 38 ? ( i1 + 'A' - 12 ) : ( i1 + 'a' - 38 ) );
                salt[1] = ( byte ) ( i2 < 12 ? ( i2 + '.' ) : i2 < 38 ? ( i2 + 'A' - 12 ) : ( i2 + 'a' - 38 ) );
                break;
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    public static String generateRandomPrefix(int size) {
        StringBuilder sb = new StringBuilder(size);

        SecureRandom sr = new SecureRandom();
        sr.nextInt(26);
        for (int i = 0; i < size; i++) {
            sb.append((char) ('a' + sr.nextInt(26)));
        }
        return sb.toString();
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        StringBuilder sb = new StringBuilder(size);

        SecureRandom sr = new SecureRandom();
        sr.nextInt(26);
        for (int i = 0; i < size; i++) {
            sb.append((char) ('a' + sr.nextInt(26)));
        }
        return sb.toString();

    }
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