public static Guid Create(Guid @namespace, byte[] name, GuidVersion version)
{
var namespaceBytes = @namespace.ToBigEndianByteArray();
byte[] hash;
using (var algorithm = version == GuidVersion.NameBasedMd5 ? MD5.Create() : SHA1.Create() as HashAlgorithm)
{
algorithm.TransformBlock(namespaceBytes, 0, namespaceBytes.Length, null, 0);
algorithm.TransformFinalBlock(name, 0, name.Length);
hash = algorithm.Hash;
}
var guidBytes = new byte[16];
Array.Copy(hash, 0, guidBytes, 0, 16);
GuidUtility.EndianSwap(guidBytes);
//Variant RFC4122
guidBytes[8] = (byte)((guidBytes[8] & 0x3F) | 0x80);//big-endian octet 8
//Version
guidBytes[7] = (byte)((guidBytes[7] & 0x0F) | ((int)version << 4));//big-endian octet 6
return(new Guid(guidBytes));
}