Visual Basic 6.0

Sign a File to Create a .p7m File (using a PFX)

See more Encryption Examples

_LANGUAGE_ example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim crypt As New ChilkatCrypt2

' 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 ChilkatCertStore
success = certStore.LoadPfxFile(pfxFilename,pfxPassword)
If (success <> 1) Then
    Debug.Print certStore.LastErrorText
    Exit Sub
End If

Dim jsonCN As New ChilkatJsonObject
success = jsonCN.UpdateString("CN",signingCertSubject)

Dim cert As New ChilkatCert
success = certStore.FindCert(jsonCN,cert)
If (success = 0) Then
    Debug.Print "Failed to find certificate by subject common name."
    Exit Sub
End If

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

' We can sign any type of file, creating a .p7m as output:
Dim inFile As String
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
Dim outputFile As String
outputFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m"
success = crypt.CreateP7M(inFile,outputFile)
If (success = 0) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

' Verify and restore the original file:
success = crypt.SetVerifyCert(cert)

inFile = outputFile
outputFile = "/Users/chilkat/testData/pdf/restored.pdf"

success = crypt.VerifyP7M(inFile,outputFile)
If (success = 0) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

Debug.Print "Success!"