Initializes a new instance of the PdfCertificateSigner class.
public PdfCertificateSigner(X509Certificate2 certificate, IEnumerable<X509Certificate2>? certificateChain = null, RSASignaturePadding? rsaSignaturePadding = null)
The signer's certificate, with an RSA or ECDSA private key.
The other certificates of the chain to embed, from the issuer upward; null for none.
ISO 32000-2 §12.8.3.3; ISO/TS 32002 §5.1.3; RFC 4056 §2.