62 lines
1.2 KiB
C#
62 lines
1.2 KiB
C#
#if !NETCF_1_0
|
|
|
|
using System;
|
|
using System.Security.Cryptography;
|
|
|
|
namespace Org.BouncyCastle.Crypto.Prng
|
|
{
|
|
/// <summary>
|
|
/// Uses Microsoft's RNGCryptoServiceProvider
|
|
/// </summary>
|
|
public class CryptoApiRandomGenerator
|
|
: IRandomGenerator
|
|
{
|
|
private readonly RNGCryptoServiceProvider rndProv;
|
|
|
|
public CryptoApiRandomGenerator()
|
|
{
|
|
rndProv = new RNGCryptoServiceProvider();
|
|
}
|
|
|
|
#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
|