PdfSecurityManagerPrepareExternalSignature(IListByte, String) Method

public PdfExternalSigningRequest PrepareExternalSignature(
	IList<byte[]> certificates,
	string signatureName
)

Public Function PrepareExternalSignature ( 
	certificates As IList(Of Byte()),
	signatureName As String
) As PdfExternalSigningRequest

Parameters

certificates  IListByte

The certificates of the signer, each DER-encoded: the signing certificate first, then the certificates of its issuers.

signatureName  String

The name of the signature field; it identifies the signature when it is completed. An empty signature field of that name that the document already has is used.

Return Value

Use it when the signature value cannot be produced while the document is saved - a remote signing service where the signer approves on another device, or a smart card in a user's browser. Save the prepared document with Save(String), have the request signed, then call CompleteExternalSignature(String, String, String, IListByte, PdfSignatureDigest, Byte) with the same certificates and DigestAlgorithm to write the signature value into it. The two steps can run in different processes.

The prepared document must be saved as it is: after this call, changes made through this manager are refused. EnableLtv and a time-stamp authority are not available in this mode.

Reference