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(Excel) Sign a File to Create a .p7s (Detached Signature)Excel 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.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim crypt As Chilkat.Crypt2 Set crypt = Chilkat.NewCrypt2 ' Use a digital certificate and private key from a PFX file (.pfx or .p12). signingCertSubject = "Acme Inc" pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx" pfxPassword = "test123" Dim certStore As Chilkat.CertStore Set certStore = Chilkat.NewCertStore success = certStore.LoadPfxFile(pfxFilename,pfxPassword) If (success <> True) Then Debug.Print certStore.LastErrorText Exit Sub End If Set cert = certStore.FindCertBySubjectCN(signingCertSubject) If (certStore.LastMethodSuccess = False) 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 .p7s as output: inFile = "/Users/chilkat/testData/pdf/sample.pdf" sigFile = "/Users/chilkat/testData/p7s/sample.p7s" success = crypt.CreateP7S(inFile,sigFile) If (success = False) Then Debug.Print crypt.LastErrorText Exit Sub End If success = crypt.VerifyP7S(inFile,sigFile) If (success = False) Then Debug.Print crypt.LastErrorText Exit Sub End If Debug.Print "Success!" |
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