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

Xojo Plugin 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 Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim crypt As New Chilkat.Crypt2

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
Dim signingCertSubject As String
signingCertSubject = "Acme Inc"
Dim pfxFilename As String
pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx"
Dim pfxPassword As String
pfxPassword = "test123"

Dim certStore As New Chilkat.CertStore
Dim success As Boolean
success = certStore.LoadPfxFile(pfxFilename,pfxPassword)
If (success <> True) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

Dim cert As Chilkat.Cert
cert = certStore.FindCertBySubjectCN(signingCertSubject)
If (certStore.LastMethodSuccess = False) Then
    System.DebugLog("Failed to find certificate by subject common name.")
    Return
End If

// Tell the crypt component to use this cert.
success = crypt.SetSigningCert(cert)

// We can sign any type of file, creating a .p7s as output:
Dim inFile As String
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
Dim sigFile As String
sigFile = "/Users/chilkat/testData/p7s/sample.p7s"

success = crypt.CreateP7S(inFile,sigFile)
If (success = False) Then
    System.DebugLog(crypt.LastErrorText)

    Return
End If

success = crypt.VerifyP7S(inFile,sigFile)
If (success = False) Then
    System.DebugLog(crypt.LastErrorText)

    Return
End If

System.DebugLog("Success!")