SignPadesToStream - TPdf - PDFium Delphi Component

Component: TPdf · Unit: PDFium

Writes a constrained approval or certification PAdES signature update to a stream

Syntax

function SignPadesToStream(Stream: TStream; const Options: TPadesSignOptions): Boolean;

Description

Appends an incremental approval or certification signature update with optional seed-value, certificate, FieldMDP and DocMDP constraints, then writes the complete output bytes to a destination stream

Parameters

Stream	The destination stream object where output data will be written
Options	Signature details structure specifying certificates, levels, optional dictionary keys and field constraints

Remarks

Requires Active to be True
The target stream will contain the original document bytes followed by the signature update block
The signature field is an invisible Widget referenced from the first page /Annots array and the AcroForm /Fields array
FieldOptions can add required seed values, allowed reasons and legal attestations, acceptable signer certificates and field or document modification policies
Existing annotations and form fields are retained, whilst the incremental update preserves the source xref table or xref-stream representation
64-bit builds support ByteRange positions beyond 2 GB through 64-bit offsets and chunked SHA-256 processing

Example

var
  OutStream: TMemoryStream;
  Opts: TPadesSignOptions;
begin
  if not Pdf1.Active then Exit;
  OutStream := TMemoryStream.Create;
  try
    Opts := TPadesSignOptions.Default;
    Opts.CertificateThumbprint := 'a1b2c3d4e5';
    Pdf1.SignPadesToStream(OutStream, Opts);
  finally
    OutStream.Free;
  end;
end;

SignPadesToStream method