public static byte[] SerializeExt(KdfParameters p)
{
return(VariantDictionary.Serialize(p));
}
public abstract byte[] Transform(byte[] pbMsg, KdfParameters p);
protected void MaximizeParamUInt64(KdfParameters p, string strName,
ulong uMin, ulong uMax, uint uMilliseconds, bool bInterpSearch)
{
if (p == null)
{
Debug.Assert(false); return;
}
if (string.IsNullOrEmpty(strName))
{
Debug.Assert(false); return;
}
if (uMin > uMax)
{
Debug.Assert(false); return;
}
if (uMax > (ulong.MaxValue >> 1))
{
Debug.Assert(false);
uMax = ulong.MaxValue >> 1;
if (uMin > uMax)
{
p.SetUInt64(strName, uMin); return;
}
}
byte[] pbMsg = new byte[32];
for (int i = 0; i < pbMsg.Length; ++i)
{
pbMsg[i] = (byte)i;
}
ulong uLow = uMin;
ulong uHigh = uMin + 1UL;
long tLow = 0;
long tHigh = 0;
long tTarget = (long)uMilliseconds;
// Determine range
while (uHigh <= uMax)
{
p.SetUInt64(strName, uHigh);
// GC.Collect();
Stopwatch sw = Stopwatch.StartNew();
Transform(pbMsg, p);
sw.Stop();
tHigh = sw.ElapsedMilliseconds;
if (tHigh > tTarget)
{
break;
}
uLow = uHigh;
tLow = tHigh;
uHigh <<= 1;
}
if (uHigh > uMax)
{
uHigh = uMax; tHigh = 0;
}
if (uLow > uHigh)
{
uLow = uHigh; // Skips to end
}
// Find optimal number of iterations
while ((uHigh - uLow) >= 2UL)
{
ulong u = (uHigh + uLow) >> 1; // Binary search
// Interpolation search, if possible
if (bInterpSearch && (tLow > 0) && (tHigh > tTarget) &&
(tLow <= tTarget))
{
u = uLow + (((uHigh - uLow) * (ulong)(tTarget - tLow)) /
(ulong)(tHigh - tLow));
if ((u >= uLow) && (u <= uHigh))
{
u = Math.Max(u, uLow + 1UL);
u = Math.Min(u, uHigh - 1UL);
}
else
{
Debug.Assert(false);
u = (uHigh + uLow) >> 1;
}
}
p.SetUInt64(strName, u);
// GC.Collect();
Stopwatch sw = Stopwatch.StartNew();
Transform(pbMsg, p);
sw.Stop();
long t = sw.ElapsedMilliseconds;
if (t == tTarget)
{
uLow = u; break;
}
else if (t > tTarget)
{
uHigh = u; tHigh = t;
}
else
{
uLow = u; tLow = t;
}
}
p.SetUInt64(strName, uLow);
}
/// <summary>
/// Generate random seeds and store them in <paramref name="p" />.
/// </summary>
public virtual void Randomize(KdfParameters p)
{
Debug.Assert(p != null);
Debug.Assert(p.KdfUuid.Equals(this.Uuid));
}