(Visual FoxPro) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

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

LOCAL loPdf
LOCAL lnSuccess
LOCAL loSigInfo
LOCAL lnNumSignatures
LOCAL lnValidated
LOCAL loCert
LOCAL i

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Pdf')
loPdf = CreateObject('Chilkat.Pdf')

* Load a PDF that has cryptographic signatures to be validated
lnSuccess = loPdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

* Each time we verify a signature, information about the signature is written into
* sigInfo (replacing whatever sigInfo previously contained).
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loSigInfo = CreateObject('Chilkat.JsonObject')

* Iterate over each signature and validate each.
lnNumSignatures = loPdf.NumSignatures
lnValidated = 0
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
i = 0
DO WHILE i < lnNumSignatures
    lnValidated = loPdf.VerifySignature(i,loSigInfo)
    ? "Signature " + STR(i) + " validated: " + STR(lnValidated)

    * The GetSignerCert method was added in Chilkat v9.5.0.87
    * After calling VerifySignature, you can get the signer certificate by calling
    * GetSignerCert with the same index. 
    lnSuccess = loPdf.GetSignerCert(i,loCert)
    IF (lnSuccess <> 0) THEN
        ? "PDF signer certificate: " + loCert.SubjectDN
    ENDIF

    i = i + 1
ENDDO

? "Finished."

RELEASE loPdf
RELEASE loSigInfo
RELEASE loCert