(Swift 2) Convert PDF to pdf.p7s (Digitally Signed)

Demonstrates how to convert a PDF into a .p7s file that contains the PDF within a PKCS7 signature (the .p7s format).

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()

    let cert = CkoCert()
    var success: Bool = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx", password: "test123")
    if success != true {
        print("\(cert.LastErrorText)")
        return
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert)
    if success != true {
        print("\(crypt.LastErrorText)")
        return
    }

    // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true. 
    crypt.CadesEnabled = true

    crypt.HashAlgorithm = "sha256"

    // We can sign any type of file, creating a .p7s as output.
    // The .p7s contains the signature and also embeds the data of the file that is signed.
    var inFile: String? = "qa_data/pdf/sample.pdf"
    var p7sFile: String? = "qa_output/sample.pdf.p7s"

    // -----------------------------------------------------------------------------------------
    // Also see Chilkat's online tool to examine a .p7m and generate code to duplicate the .p7m
    // -----------------------------------------------------------------------------------------

    // Create the CAdES-BES attached signature, which contains the original data.
    // Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
    // is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
    // is NOT contained within the signature.  We want the data to be contained in the signature, therefore
    // we call CreateP7M even though we are naming our output file .p7s.
    success = crypt.CreateP7M(inFile, p7mPath: p7sFile)
    if success == false {
        print("\(crypt.LastErrorText)")
        return
    }

    // Verify the .p7s file and extract the original file from the .p7s. 
    var extractedToFilePath: String? = "qa_output/sample.pdf"
    success = crypt.VerifyP7M(p7sFile, destPath: extractedToFilePath)
    if success == false {
        print("\(crypt.LastErrorText)")
        return
    }

    print("Success!")

}