SP800SecureRandom
using Org.BouncyCastle.Crypto.Prng.Drbg;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Crypto.Prng
{
public class SP800SecureRandom : SecureRandom
{
private readonly IDrbgProvider mDrbgProvider;
private readonly bool mPredictionResistant;
private readonly SecureRandom mRandomSource;
private readonly IEntropySource mEntropySource;
private ISP80090Drbg mDrbg;
internal SP800SecureRandom(SecureRandom randomSource, IEntropySource entropySource, IDrbgProvider drbgProvider, bool predictionResistant)
: base(null)
{
mRandomSource = randomSource;
mEntropySource = entropySource;
mDrbgProvider = drbgProvider;
mPredictionResistant = predictionResistant;
}
public override void SetSeed(byte[] seed)
{
lock (this) {
if (mRandomSource != null)
mRandomSource.SetSeed(seed);
}
}
public override void SetSeed(long seed)
{
lock (this) {
if (mRandomSource != null)
mRandomSource.SetSeed(seed);
}
}
public override void NextBytes(byte[] bytes)
{
NextBytes(bytes, 0, bytes.Length);
}
public override void NextBytes(byte[] buf, int off, int len)
{
lock (this) {
if (mDrbg == null)
mDrbg = mDrbgProvider.Get(mEntropySource);
if (mDrbg.Generate(buf, off, len, null, mPredictionResistant) < 0) {
mDrbg.Reseed(null);
mDrbg.Generate(buf, off, len, null, mPredictionResistant);
}
}
}
public override byte[] GenerateSeed(int numBytes)
{
return EntropyUtilities.GenerateSeed(mEntropySource, numBytes);
}
public virtual void Reseed(byte[] additionalInput)
{
lock (this) {
if (mDrbg == null)
mDrbg = mDrbgProvider.Get(mEntropySource);
mDrbg.Reseed(additionalInput);
}
}
}
}