本文整理汇总了C#中ECPoint.SetPreCompInfo方法的典型用法代码示例。如果您正苦于以下问题：C# ECPoint.SetPreCompInfo方法的具体用法？C# ECPoint.SetPreCompInfo怎么用？C# ECPoint.SetPreCompInfo使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ECPoint的用法示例。
在下文中一共展示了ECPoint.SetPreCompInfo方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Multiply
//.........这里部分代码省略.........
reqPreCompLen = 8;
}
else
{
if (m < 897)
{
width = 6;
reqPreCompLen = 16;
}
else
{
if (m < 2305)
{
width = 7;
reqPreCompLen = 32;
}
else
{
width = 8;
reqPreCompLen = 127;
}
}
}
}
}
}
// The length of the precomputation array
int preCompLen = 1;
ECPoint[] preComp = wnafPreCompInfo.GetPreComp();
ECPoint twiceP = wnafPreCompInfo.GetTwiceP();
// Check if the precomputed ECPoints already exist
if (preComp == null)
{
// Precomputation must be performed from scratch, create an empty
// precomputation array of desired length
preComp = new ECPoint[]{ p };
}
else
{
// Take the already precomputed ECPoints to start with
preCompLen = preComp.Length;
}
if (twiceP == null)
{
// Compute twice(p)
twiceP = p.Twice();
}
if (preCompLen < reqPreCompLen)
{
// Precomputation array must be made bigger, copy existing preComp
// array into the larger new preComp array
ECPoint[] oldPreComp = preComp;
preComp = new ECPoint[reqPreCompLen];
Array.Copy(oldPreComp, 0, preComp, 0, preCompLen);
for (int i = preCompLen; i < reqPreCompLen; i++)
{
// Compute the new ECPoints for the precomputation array.
// The values 1, 3, 5, ..., 2^(width-1)-1 times p are
// computed
preComp[i] = twiceP.Add(preComp[i - 1]);
}
}
// Compute the Window NAF of the desired width
sbyte[] wnaf = WindowNaf(width, k);
int l = wnaf.Length;
// Apply the Window NAF to p using the precomputed ECPoint values.
ECPoint q = p.Curve.Infinity;
for (int i = l - 1; i >= 0; i--)
{
q = q.Twice();
if (wnaf[i] != 0)
{
if (wnaf[i] > 0)
{
q = q.Add(preComp[(wnaf[i] - 1)/2]);
}
else
{
// wnaf[i] < 0
q = q.Subtract(preComp[(-wnaf[i] - 1)/2]);
}
}
}
// Set PreCompInfo in ECPoint, such that it is available for next
// multiplication.
wnafPreCompInfo.SetPreComp(preComp);
wnafPreCompInfo.SetTwiceP(twiceP);
p.SetPreCompInfo(wnafPreCompInfo);
return q;
}