//
// If the message is simply a certificate chain message getContent() may return null.
//
ContentInfoParser cont = _signedData.getEncapContentInfo();
ASN1OctetStringParser octs = (ASN1OctetStringParser)
cont.getContent(DERTags.OCTET_STRING);
if (octs != null)
{
CMSTypedStream ctStr = new CMSTypedStream(
cont.getContentType().getId(), octs.getOctetStream());
if (_signedContent == null)
{
_signedContent = ctStr;
}