Verify .p7s and Extract Original File

Download Chilkat Crypt ActiveX

Visual Basic example to verify and unpack the contents of a .p7s to restore the original file.

Dim crypt As New ChilkatCrypt2

'  Any string argument automatically begins the 30-day trial.
Dim success As Long
success = crypt.UnlockComponent("30-day trial")
If (success <> 1) Then
    MsgBox "Crypt component unlock failed"
    Exit Sub
End If

'  Find our digital certificate from the Current User certificate store.
Dim ccs As New ChilkatCreateCS
Dim certStore As ChilkatCertStore
Set certStore = ccs.OpenCurrentUserStore()
Dim cert As ChilkatCert
Set cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.")
If (cert Is Nothing ) Then
    MsgBox cert.LastErrorText

    Exit Sub
End If

'  Verify and restore the original file:
crypt.SetVerifyCert cert

success = crypt.VerifyP7S("license.p7s","license2.rtf")
If (success = 0) Then
    MsgBox crypt.LastErrorText

    Exit Sub
End If

MsgBox "Success!"