Interface IExternalSigner

Abstraction for producing an external CMS (PKCS#7) detached signature over a PDF byte range.

Namespace: Telerik.Documents.Fixed.Model.DigitalSignatures
Assembly: Telerik.Windows.Documents.Fixed.dll

Syntax

public interface IExternalSigner
Remarks

Implement this interface when integrating custom or third‑party signing components (e.g. HSMs, smart cards, remote signing services). The implementation is responsible for:

  1. Computing the digest of the PDF byte range data.
  2. Building a CMS SignedData structure whose signature value matches the specified DigestAlgorithm.
  3. Optionally applying an RFC 3161 timestamp when TimeStampServer is provided. The returned value must be a detached SignedData (i.e. encapsulated content is omitted) suitable for embedding directly in a PDF signature dictionary.

Methods

Sign(Byte[], SignatureSettings)

Builds a detached CMS (PKCS#7) signature for the provided PDF byte range data using the supplied settings.

Declaration
byte[] Sign(byte[] pdfByteRangeData, SignatureSettings settings)
Parameters
System.Byte[] pdfByteRangeData

The raw PDF byte range data (document content excluding the signature placeholder) whose digest will be computed and signed.
SignatureSettings settings

Signature generation settings controlling digest algorithm and timestamping.
Returns
System.Byte[]

Byte array containing the CMS SignedData structure (detached) ready for embedding in a PDF.