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(Excel) Sign a File to Create a .p7m File (using a PFX)Excel 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.
' 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 .p7m as output: inFile = "/Users/chilkat/testData/pdf/sample.pdf" outputFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m" success = crypt.CreateP7M(inFile,outputFile) If (success = False) 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 = False) Then Debug.Print crypt.LastErrorText Exit Sub End If Debug.Print "Success!" |
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