(Lianja) Sign a File to Create a .p7s (Detached Signature)

Lianja example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loCrypt = createobject("CkCrypt2")

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
lcSigningCertSubject = "Acme Inc"
lcPfxFilename = "/Users/chilkat/testData/pfx/acme.pfx"
lcPfxPassword = "test123"

loCertStore = createobject("CkCertStore")
llSuccess = loCertStore.LoadPfxFile(lcPfxFilename,lcPfxPassword)
if (llSuccess <> .T.) then
    ? loCertStore.LastErrorText
    release loCrypt
    release loCertStore
    return
endif

loCert = loCertStore.FindCertBySubjectCN(lcSigningCertSubject)
if (loCertStore.LastMethodSuccess = .F.) then
    ? "Failed to find certificate by subject common name."
    release loCrypt
    release loCertStore
    return
endif

// Tell the crypt component to use this cert.
llSuccess = loCrypt.SetSigningCert(loCert)

// We can sign any type of file, creating a .p7s as output:
lcInFile = "/Users/chilkat/testData/pdf/sample.pdf"
lcSigFile = "/Users/chilkat/testData/p7s/sample.p7s"

llSuccess = loCrypt.CreateP7S(lcInFile,lcSigFile)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCert
    release loCrypt
    release loCertStore
    return
endif

llSuccess = loCrypt.VerifyP7S(lcInFile,lcSigFile)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCert
    release loCrypt
    release loCertStore
    return
endif

release loCert

? "Success!"


release loCrypt
release loCertStore