/// <summary>
/// Returns the SecureRandom used to generate secure random data.
/// <para>
/// Creates and initializes if null. Uses
/// <c>System.currentTimeMillis() + System.identityHashCode(this)</c> as the default seed.
/// </para>
/// </summary>
/// <returns>the SecureRandom used to generate secure random data, wrapped in a
/// <see cref="RandomGenerator"/>.</returns>
private RandomGenerator getSecRan()
{
if (secRand == null)
{
secRand = RandomGeneratorFactory.createRandomGenerator(new SecureRandom());
//Find unix timestamp (seconds since 01/01/1970)
long ticks = DateTime.UtcNow.Ticks - DateTime.Parse("01/01/1970 00:00:00").Ticks;
ticks /= 10000; //current timestamp in millis
secRand.setSeed(ticks + this.GetHashCode());
}
return(secRand);
}
/// <summary>
/// Sets the PRNG algorithm for the underlying SecureRandom instance using
/// the Security Provider API. The Security Provider API is defined in <a
/// href =
/// "http://java.sun.com/j2se/1.3/docs/guide/security/CryptoSpec.html#AppA">
/// Java Cryptography Architecture API Specification & Reference.</a>
/// <para>
/// <strong>USAGE NOTE:</strong> This method carries <i>significant</i>
/// overhead and may take several seconds to execute.
/// </para>
/// </summary>
/// <param name="algorithm">the name of the PRNG algorithm</param>
public void setSecureAlgorithm(String algorithm)
{
secRand = RandomGeneratorFactory.createRandomGenerator(SecureRandom.GetInstance(algorithm));
}
