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(PowerBuilder) Create CMS Signed File (PDF) with Multiple Signing Certificates

Demonstrates how to sign a file by adding multiple signatures (multiple certificates). This example signs a PDF file to produce an output file that is a CMS signature wrapping the original PDF. (Note: This is different than modifying a PDF by injecting a signature into the PDF file format.)

Note: This example requires Chilkat v9.5.0.83 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Crypt
oleobject loo_Cert1
integer li_Success
oleobject loo_Cert2
string ls_InFile
string ls_P7sFile
string ls_ExtractedToFilePath

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

loo_Crypt = create oleobject
li_rc = loo_Crypt.ConnectToNewObject("Chilkat_9_5_0.Crypt2")
if li_rc < 0 then
    destroy loo_Crypt
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// ------------ This example requires Chilkat v9.5.0.83 or greater.

loo_Cert1 = create oleobject
li_rc = loo_Cert1.ConnectToNewObject("Chilkat_9_5_0.Cert")

li_Success = loo_Cert1.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if li_Success <> 1 then
    Write-Debug loo_Cert1.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert1
    return
end if

loo_Cert2 = create oleobject
li_rc = loo_Cert2.ConnectToNewObject("Chilkat_9_5_0.Cert")

li_Success = loo_Cert2.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret")
if li_Success <> 1 then
    Write-Debug loo_Cert2.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert1
    destroy loo_Cert2
    return
end if

// ------------ This example requires Chilkat v9.5.0.83 or greater.

// Tell the crypt component to use both certificates for signing. 
// When we create the signature, it will be signed by both certificates.
li_Success = loo_Crypt.AddSigningCert(loo_Cert1)
if li_Success <> 1 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert1
    destroy loo_Cert2
    return
end if

li_Success = loo_Crypt.AddSigningCert(loo_Cert2)
if li_Success <> 1 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert1
    destroy loo_Cert2
    return
end if

// The CadesEnabled property applies to all methods that create PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true. 
loo_Crypt.CadesEnabled = 1

loo_Crypt.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.
ls_InFile = "qa_data/pdf/sample.pdf"
ls_P7sFile = "qa_output/sample.pdf.p7s"

// 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.
li_Success = loo_Crypt.CreateP7M(ls_InFile,ls_P7sFile)
if li_Success = 0 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert1
    destroy loo_Cert2
    return
end if

// Verify the .p7s file and extract the original file from the .p7s. 
ls_ExtractedToFilePath = "qa_output/sample.pdf"
li_Success = loo_Crypt.VerifyP7M(ls_P7sFile,ls_ExtractedToFilePath)
if li_Success = 0 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert1
    destroy loo_Cert2
    return
end if

Write-Debug "Success!"


destroy loo_Crypt
destroy loo_Cert1
destroy loo_Cert2

 

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