private AsymmetricKeyParameter GetSenderPublicKey(AsymmetricKeyParameter receiverPrivateKey, OriginatorIdentifierOrKey originator)
{
OriginatorPublicKey originatorPublicKey = originator.OriginatorPublicKey;
if (originatorPublicKey != null)
{
return(GetPublicKeyFromOriginatorPublicKey(receiverPrivateKey, originatorPublicKey));
}
OriginatorID originatorID = new OriginatorID();
Org.BouncyCastle.Asn1.Cms.IssuerAndSerialNumber issuerAndSerialNumber = originator.IssuerAndSerialNumber;
if (issuerAndSerialNumber != null)
{
originatorID.Issuer = issuerAndSerialNumber.Name;
originatorID.SerialNumber = issuerAndSerialNumber.SerialNumber.Value;
}
else
{
SubjectKeyIdentifier subjectKeyIdentifier = originator.SubjectKeyIdentifier;
originatorID.SubjectKeyIdentifier = subjectKeyIdentifier.GetKeyIdentifier();
}
return(GetPublicKeyFromOriginatorID(originatorID));
}
private AsymmetricKeyParameter GetPublicKeyFromOriginatorID(OriginatorID origID)
{
throw new CmsException("No support for 'originator' as IssuerAndSerialNumber or SubjectKeyIdentifier");
}
