/// <summary>
/// Generates a RFC4122 random number based UUID (version-4)
/// </summary>
/// <returns></returns>
public Guid GenerateGuid()
{
var data = new byte[16];
generator.GetBytes(data);
data.AddVariantMarker().AddVersionMarker(UUIDVersion.Random);
return(new Guid(data));
}
private static Guid GenerateGuid(DateTimeOffset dateTime, byte[] clockSequenceData, byte[] macAddressBytes)
{
if (macAddressBytes == null)
{
throw new ArgumentNullException(nameof(macAddressBytes));
}
if (macAddressBytes.Length != 6)
{
throw new ArgumentException($"{nameof(macAddressBytes)} must have 6 bytes.");
}
if (clockSequenceData == null)
{
throw new ArgumentNullException(nameof(clockSequenceData));
}
if (clockSequenceData.Length != 2)
{
throw new ArgumentException($"{nameof(clockSequenceData)} must have 2 bytes.");
}
var ticksSinceStart = (dateTime - ClockStart).Ticks;
var timestampBytes = BitConverter.GetBytes(ticksSinceStart);
var data = new byte[16];
/*
* - Set the time_low field equal to the least significant 32 bits (bits zero through 31) of the timestamp in the same order of significance.
* - Set the time_mid field equal to bits 32 through 47 from the timestamp in the same order of significance.
* - Set the 12 least significant bits (bits zero through 11) of the time_hi_and_version field equal to bits 48 through 59 from the timestamp in the same order of significance.
*/
Array.Copy(timestampBytes, 0, data, 0, Math.Min(timestampBytes.Length, 8));
/*
* - Set the clock_seq_low field to the eight least significant bits (bits zero through 7) of the clock sequence in the same order of significance.
* - Set the 6 least significant bits (bits zero through 5) of the clock_seq_hi_and_reserved field to the 6 most significant bits (bits 8 through 13) of the clock sequence in the same order of significance.
*/
Array.Copy(clockSequenceData, 0, data, 8, clockSequenceData.Length);
/*
* - Set the node field to the 48-bit IEEE address in the same order of significance as the address.
*/
Array.Copy(macAddressBytes, 0, data, 10, macAddressBytes.Length);
data.AddVariantMarker().AddVersionMarker(UUIDVersion.TimeBased);
return(new Guid(data));
}
