(Lianja) Convert PDF to pdf.p7s (Digitally Signed)

Demonstrates how to convert a PDF into a .p7s file that contains the PDF within a PKCS7 signature (the .p7s format).

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loCrypt = createobject("CkCrypt2")

loCert = createobject("CkCert")
llSuccess = loCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

// Tell the crypt component to use this cert.
llSuccess = loCrypt.SetSigningCert(loCert)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

// The CadesEnabled property applies to all methods that create PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true. 
loCrypt.CadesEnabled = .T.

loCrypt.HashAlgorithm = "sha256"

// We can sign any type of file, creating a .p7s as output.
// The .p7s contains the signature and also embeds the data of the file that is signed.
lcInFile = "qa_data/pdf/sample.pdf"
lcP7sFile = "qa_output/sample.pdf.p7s"

// -----------------------------------------------------------------------------------------
// Also see Chilkat's online tool to examine a .p7m and generate code to duplicate the .p7m
// -----------------------------------------------------------------------------------------

// Create the CAdES-BES attached signature, which contains the original data.
// Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
// is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
// is NOT contained within the signature.  We want the data to be contained in the signature, therefore
// we call CreateP7M even though we are naming our output file .p7s.
llSuccess = loCrypt.CreateP7M(lcInFile,lcP7sFile)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

// Verify the .p7s file and extract the original file from the .p7s. 
lcExtractedToFilePath = "qa_output/sample.pdf"
llSuccess = loCrypt.VerifyP7M(lcP7sFile,lcExtractedToFilePath)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

? "Success!"


release loCrypt
release loCert