CryptoApiEntropySourceProvider
using System;
using System.Security.Cryptography;
namespace Org.BouncyCastle.Crypto.Prng
{
public class CryptoApiEntropySourceProvider : IEntropySourceProvider
{
private class CryptoApiEntropySource : IEntropySource
{
private readonly RandomNumberGenerator mRng;
private readonly bool mPredictionResistant;
private readonly int mEntropySize;
bool IEntropySource.IsPredictionResistant {
get {
return mPredictionResistant;
}
}
int IEntropySource.EntropySize {
get {
return mEntropySize;
}
}
internal CryptoApiEntropySource(RandomNumberGenerator rng, bool predictionResistant, int entropySize)
{
mRng = rng;
mPredictionResistant = predictionResistant;
mEntropySize = entropySize;
}
byte[] IEntropySource.GetEntropy()
{
byte[] array = new byte[(mEntropySize + 7) / 8];
mRng.GetBytes(array);
return array;
}
}
private readonly RandomNumberGenerator mRng;
private readonly bool mPredictionResistant;
public CryptoApiEntropySourceProvider()
: this(RandomNumberGenerator.Create(), true)
{
}
public CryptoApiEntropySourceProvider(RandomNumberGenerator rng, bool isPredictionResistant)
{
if (rng == null)
throw new ArgumentNullException("rng");
mRng = rng;
mPredictionResistant = isPredictionResistant;
}
public IEntropySource Get(int bitsRequired)
{
return new CryptoApiEntropySource(mRng, mPredictionResistant, bitsRequired);
}
}
}