aar,
aar wrote
> We are using a SSL certificate of our site issued by Thawte in this case.
> It is a chained certificate with 3 certs in it. I cannot provide the
> certificate because it contains a private key.
>
> If we cannot use SSL certificate, Can I know what kind of certificates
> itextsharp supports.
It's not a question of which certificates iTextSharp supports (after all, it
was not an iTextSharp class which returned null but instead PKCS12Store) but
which certificates are allowed to sign documents.
Please check the key usage and extended key usage extensions of the
certificate. Do they allow document signing?
I'm just looking at a Thawte SSL certificate we use here. This certificate
doesn't have a key usage extension at all and the extended key usage
extension values
id-kp-serverAuth OBJECT IDENTIFIER ::= { id-kp 1 }
-- TLS WWW server authentication
id-kp-clientAuth OBJECT IDENTIFIER ::= { id-kp 2 }
-- TLS WWW client authentication
So, there is no indication that this certificate may be used for anything
but SSL / TLS purposes.
Maybe it's the same with yours.
You should ask your PKI for a certificate for digital signing. Depending on
your requirements it might be more important to get either a certificate
compliant with the local signature law or a certificate trusted by Adobe
Reader out-of-the-box.
Regards, Michael
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