/// <summary>
/// Creates a signed entity from a <see cref="MimeEntity"/>, which must be multipart and have a content and signed part.
/// </summary>
/// <param name="source">The source entity.</param>
/// <returns>The newly initialized signed entity.</returns>
public static SignedEntity Load(MimeEntity source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (!source.IsMultiPart)
{
throw new SignatureException(SignatureError.InvalidMultipartSigned);
}
return(new SignedEntity(source.ParsedContentType, source.GetParts()));
}
