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using System;
using System.IO;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Utilities.Test
{
public class FixedSecureRandom
: SecureRandom
{
private byte[] _data;
private int _index;
protected FixedSecureRandom(
byte[] data)
{
_data = data;
}
public static FixedSecureRandom From(
params byte[][] values)
{
MemoryStream bOut = new MemoryStream();
for (int i = 0; i != values.Length; i++)
{
try
{
byte[] v = values[i];
bOut.Write(v, 0, v.Length);
}
catch (IOException)
{
throw new ArgumentException("can't save value array.");
}
}
return new FixedSecureRandom(bOut.ToArray());
}
public override void NextBytes(
byte[] buf)
{
Array.Copy(_data, _index, buf, 0, buf.Length);
_index += buf.Length;
}
public override void NextBytes(
byte[] buf,
int off,
int len)
{
Array.Copy(_data, _index, buf, off, len);
_index += len;
}
public bool IsExhausted
{
get { return _index == _data.Length; }
}
}
}
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