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#if !(NETCF_1_0 || PORTABLE)
using System;
using System.Security.Cryptography;
namespace Org.BouncyCastle.Crypto.Prng
{
/// <summary>
/// Uses Microsoft's RNGCryptoServiceProvider
/// </summary>
public class CryptoApiRandomGenerator
: IRandomGenerator
{
private readonly RandomNumberGenerator rndProv;
public CryptoApiRandomGenerator()
: this(new RNGCryptoServiceProvider())
{
}
public CryptoApiRandomGenerator(RandomNumberGenerator rng)
{
this.rndProv = rng;
}
#region IRandomGenerator Members
public virtual void AddSeedMaterial(byte[] seed)
{
// We don't care about the seed
}
public virtual void AddSeedMaterial(long seed)
{
// We don't care about the seed
}
public virtual void NextBytes(byte[] bytes)
{
rndProv.GetBytes(bytes);
}
public virtual void NextBytes(byte[] bytes, int start, int len)
{
if (start < 0)
throw new ArgumentException("Start offset cannot be negative", "start");
if (bytes.Length < (start + len))
throw new ArgumentException("Byte array too small for requested offset and length");
if (bytes.Length == len && start == 0)
{
NextBytes(bytes);
}
else
{
byte[] tmpBuf = new byte[len];
rndProv.GetBytes(tmpBuf);
Array.Copy(tmpBuf, 0, bytes, start, len);
}
}
#endregion
}
}
#endif
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