(SQL Server) PDF Signature with Background Image (Seal/Stamp/etc.)

See more PDF Signatures Examples

Demonstrates how to sign a PDF with an appearance that includes a background image, such as a seal, stamp, etc.

Note: This example requires Chilkat v9.5.0.85 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

// Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
//
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @pdf int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Pdf', @pdf OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Load a PDF to be signed.
    -- The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    DECLARE @success int
    EXEC sp_OAMethod @pdf, 'LoadFile', @success OUT, 'qa_data/pdf/hello.pdf'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        RETURN
      END

    -- Options for signing are specified in JSON.
    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.JsonObject', @json OUT

    -- In most cases, the signingCertificateV2 and signingTime attributes are required.
    EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'signingCertificateV2', 1
    EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'signingTime', 1

    -- Put the signature on page 1, top left
    EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'page', 1
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.y', 'top'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.x', 'left'

    -- Use a font scale of 10.0
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.fontScale', '10.0'

    -- In this example, the appearance of the digital signature will contain three lines:
    -- 1) The signing certificate's common name
    -- 2) The current date/time
    -- 3) Some arbitrary text.
    -- The keyword "cert_cn" is replaced with the Certificate's Subject Common Name.
    -- The keyword "current_dt" is replaced with the current date/time.
    -- Any number of appearance text lines can be added.
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[0]', 'Digitally signed by: cert_cn'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[1]', 'current_dt'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[2]', 'The crazy brown fox jumps over the lazy dog.'

    -- Load a JPG image to be shown with 30% opacity in the background.
    -- (the image must be in the JPG format)
    -- The sample university.jpb is available at https://example-code.com/images/university.jpg

    DECLARE @jpgData int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.BinData', @jpgData OUT

    EXEC sp_OAMethod @jpgData, 'LoadFile', @success OUT, 'qa_data/jpg/university.jpg'
    IF @success = 0
      BEGIN

        PRINT 'Failed to load the JPG image.'
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jpgData
        RETURN
      END
    EXEC sp_OAMethod @pdf, 'SetSignatureJpeg', @success OUT, @jpgData
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jpgData
        RETURN
      END

    -- Specify that we want to display the JPG image in the center with 30% opacity.
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.image', 'custom-jpg'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imagePlacement', 'center'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imageOpacity', '30'

    -- Load the signing certificate. (Use your own certificate.)
    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Cert', @cert OUT

    EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/pfx/myPdfSigningCert.pfx', 'secret'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- Tell the pdf object to use the certificate for signing.
    EXEC sp_OAMethod @pdf, 'SetSigningCert', @success OUT, @cert
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    EXEC sp_OAMethod @pdf, 'SignPdf', @success OUT, @json, 'qa_output/hello_signed.pdf'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END


    PRINT 'The PDF has been successfully cryptographically signed.'

    -- The appearance of the signature appears in Adobe Acrobat as shown below.
    -- The JPG is automatically scaled to the size of the signature based on the signature's font scale
    -- and number of text lines.
    

    EXEC @hr = sp_OADestroy @pdf
    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @jpgData
    EXEC @hr = sp_OADestroy @cert


END
GO