Visual FoxPro

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

See more Encryption Examples

_LANGUAGE_ 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. Visual FoxPro

LOCAL lnSuccess
LOCAL loCrypt
LOCAL lcSigningCertSubject
LOCAL lcPfxFilename
LOCAL lcPfxPassword
LOCAL loCertStore
LOCAL loJsonCN
LOCAL loCert
LOCAL lcInFile
LOCAL lcSigFile

lnSuccess = 0

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

loCrypt = CreateObject('Chilkat.Crypt2')

* 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('Chilkat.CertStore')
lnSuccess = loCertStore.LoadPfxFile(lcPfxFilename,lcPfxPassword)
IF (lnSuccess <> 1) THEN
    ? loCertStore.LastErrorText
    RELEASE loCrypt
    RELEASE loCertStore
    CANCEL
ENDIF

loJsonCN = CreateObject('Chilkat.JsonObject')
loJsonCN.UpdateString("CN",lcSigningCertSubject)

loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCertStore.FindCert(loJsonCN,loCert)
IF (lnSuccess = 0) THEN
    ? "Failed to find certificate by subject common name."
    RELEASE loCrypt
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    CANCEL
ENDIF

* Tell the crypt component to use this cert.
lnSuccess = 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"

lnSuccess = loCrypt.CreateP7S(lcInFile,lcSigFile)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loCrypt.VerifyP7S(lcInFile,lcSigFile)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    CANCEL
ENDIF

? "Success!"

RELEASE loCrypt
RELEASE loCertStore
RELEASE loJsonCN
RELEASE loCert