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IExternalSigner

Interface

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

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

Computing the digest of the PDF byte range data.

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.

Definition

Namespace:Telerik.Documents.Fixed.Model.DigitalSignatures

Assembly:Telerik.Windows.Documents.Fixed.dll

Syntax:

public interface IExternalSigner

Derived Classes: ExternalSignerBase

Methods

Sign(byte[], SignatureSettings)

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

byte[] Sign(byte[] pdfByteRangeData, SignatureSettings settings)

Parameters:pdfByteRangeDatabyte[]

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

settingsSignatureSettings

Signature generation settings controlling digest algorithm and timestamping.

Returns:

byte[]

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