/// <summary>
/// Determine the curve name from an EC key blob
/// </summary>
/// <param name="magic">Magic number</param>
/// <returns>Curve name</returns>
private static string getCurveName(int magic, CurveNamespace nameSpace)
{
switch (magic)
{
case (int)KeyBlobMagicNumber.ECDHPublicP256:
case (int)KeyBlobMagicNumber.ECDsaPublicP256:
switch (nameSpace)
{
case CurveNamespace.X962:
return("prime256v1");
case CurveNamespace.NIST:
return("P-256");
case CurveNamespace.SEC:
return("SecP256r1");
}
break;
case (int)KeyBlobMagicNumber.ECDHPublicP384:
case (int)KeyBlobMagicNumber.ECDsaPublicP384:
switch (nameSpace)
{
case CurveNamespace.X962: // These aren't in the BC list
return("prime384v1");
case CurveNamespace.NIST:
return("P-384");
case CurveNamespace.SEC:
return("SecP384r1");
}
break;
case (int)KeyBlobMagicNumber.ECDHPublicP521:
case (int)KeyBlobMagicNumber.ECDsaPublicP521:
switch (nameSpace)
{
case CurveNamespace.X962: // These aren't in the BC list
return("prime521v1");
case CurveNamespace.NIST:
return("P-521");
case CurveNamespace.SEC:
return("SecP521r1");
}
break;
}
return("");
}
/// <summary>
/// Get the curve from an EC key blob
/// </summary>
/// <param name="magic">Magic number</param>
/// <returns>Curve </returns>
private static X9ECParameters getCurve(int magic, CurveNamespace nameSpace)
{
switch (magic)
{
case (int)KeyBlobMagicNumber.ECDHPublicP256:
case (int)KeyBlobMagicNumber.ECDsaPublicP256:
switch (nameSpace)
{
case CurveNamespace.X962:
return(X962NamedCurves.GetByName("prime256v1"));
case CurveNamespace.NIST:
return(NistNamedCurves.GetByName("P-256"));
case CurveNamespace.SEC:
return(SecNamedCurves.GetByName("SecP256r1"));
}
break;
case (int)KeyBlobMagicNumber.ECDHPublicP384:
case (int)KeyBlobMagicNumber.ECDsaPublicP384:
switch (nameSpace)
{
case CurveNamespace.X962: // These aren't in the BC list
return(X962NamedCurves.GetByName("prime384v1"));
case CurveNamespace.NIST:
return(NistNamedCurves.GetByName("P-384"));
case CurveNamespace.SEC:
return(SecNamedCurves.GetByName("SecP384r1"));
}
break;
case (int)KeyBlobMagicNumber.ECDHPublicP521:
case (int)KeyBlobMagicNumber.ECDsaPublicP521:
switch (nameSpace)
{
case CurveNamespace.X962: // These aren't in the BC list
return(X962NamedCurves.GetByName("prime521v1"));
case CurveNamespace.NIST:
return(NistNamedCurves.GetByName("P-521"));
case CurveNamespace.SEC:
return(SecNamedCurves.GetByName("SecP521r1"));
}
break;
}
return(null);
}
