/// <summary>
/// Generate a namespace GUID (V3 or V5) with a given algorithm
/// </summary>
/// <param name="namespaceId">The namespace we're generating the GUID in</param>
/// <param name="name">The name we're generating the GUID for</param>
/// <param name="version">The version to generate (MD5 or SHA1)</param>
/// <returns></returns>
private static UUID GenerateNameBased(System.Guid namespaceId, string name, GuidVersion version)
{
if (version != GuidVersion.MD5 && version != GuidVersion.SHA1)
{
throw new ArgumentException("version", "Name based guids can only be version 3, or 5");
}
if (String.IsNullOrEmpty(name))
{
throw new ArgumentNullException("name", "The name parameter cannot be empty or null");
}
byte[] nameBytes = Encoding.UTF8.GetBytes(name);
byte[] namespaceBytes = namespaceId.ToByteArray();
if (BitConverter.IsLittleEndian)
{
ToggleEndianess(namespaceBytes);
}
var hash = version == GuidVersion.MD5 ?
HashProvider.GenerateMD5Hash(namespaceBytes, nameBytes) :
HashProvider.GenerateSHA1Hash(namespaceBytes, nameBytes);
if (BitConverter.IsLittleEndian)
{
ToggleEndianess(hash);
}
return(GenerateFromComponents(
hash.Skip(Constants.TIMESTAMP_BYTE_INDEX).Take(Constants.TIME_BYTES_LENGTH).ToArray(),
hash.Skip(Constants.CLOCK_SEQUENCE_BYTE_INDEX).Take(Constants.CLOCK_SEQUENCE_BYTES_LENGTH).ToArray(),
hash.Skip(Constants.NODE_BYTE_INDEX).Take(Constants.NODE_BYTES_LENGTH).ToArray(),
version, GuidVariant.RFC4122));
}
