SQL Server

PDF Sign Unsigned Signature Field

See more PDF Signatures Examples

Demonstrates how to sign a PDF's unsigned signature field.

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

SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    -- 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.Pdf', @pdf OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Load a PDF containing an unsigned signature field.
    EXEC sp_OAMethod @pdf, 'LoadFile', @success OUT, 'qa_data/pdf/unsigned_sig_field/due_diligence.pdf'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pdf
        RETURN
      END

    -- A PDF with an unsigned signature field appears in Adobe Acrobat as shown below.
    -- (When the mouse pointer is hovered over the field, a tooltip will likely show a message
    -- such as "Unsigned signature field (Click to sign)".  
    -- This example code will automatically find the unsigned signature field,
    -- and signs using your certificate.  It automatically sizes the text to the space alotted
    -- for the signature.
    -- (image:https://example-code.com/images/unsignedSigField.jpg/endImage)

    -- Options for signing are specified in JSON.
    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.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

    -- We don't specify the page or a specific location because Chilkat will automatically
    -- find the unsigned signature field and use its location and size and will scale the
    -- signatures visual appearance (text + graphics) to the correct size required to fit.
    -- We only need to indicate the desire to fill the unsigned signature field.
    EXEC sp_OAMethod @json, 'UpdateBool', @success OUT, 'appearance.fillUnsignedSignatureField', 1

    -- Starting in Chilkat v9.5.0.90, if a PDF contains multiple unsigned signature fields,
    -- the field to be signed can be chosen by name:
    -- To list unsigned signature fields, see this example: List PDF Unsigned Signature Fields
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'unsignedSignatureField', 'doctor_signature'

    -- Note: If the PDF document contains multiple unsigned signature fields, Chilkat will 
    -- sign the 1st one found. 

    -- 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.'

    -- This signature will include one of the built-in SVG graphics (green-check-grey-circle).
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.image', 'green-check-grey-circle'
    EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imagePlacement', 'left'

    -- Load the signing certificate. (Use your own certificate.)
    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.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 @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 @cert
        RETURN
      END

    EXEC sp_OAMethod @pdf, 'SignPdf', @success OUT, @json, 'qa_output/due_diligence_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 @cert
        RETURN
      END


    PRINT 'The PDF has been successfully cryptographically signed.'

    -- The appearance of the signature appears in Adobe Acrobat as shown below.
    -- (image:https://example-code.com/images/signature3.jpg/endImage)

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


END
GO