(Swift) Sign a File to Create a .p7s (Detached Signature)

Swift 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.

Note: This example requires Chilkat v10.1.2 or greater.

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

    let crypt = CkoCrypt2()!

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    var signingCertSubject: String? = "Acme Inc"
    var pfxFilename: String? = "/Users/chilkat/testData/pfx/acme.pfx"
    var pfxPassword: String? = "test123"

    let certStore = CkoCertStore()!
    var success: Bool = certStore.loadPfxFile(pfxFilename, password: pfxPassword)
    if success != true {
        print("\(certStore.lastErrorText!)")
        return
    }

    let jsonCN = CkoJsonObject()!
    jsonCN.update("CN", value: signingCertSubject)

    let cert = CkoCert()!
    success = certStore.findCert(jsonCN, cert: cert)
    if success == false {
        print("Failed to find certificate by subject common name.")
        return
    }

    // Tell the crypt component to use this cert.
    success = crypt.setSigning(cert)

    // We can sign any type of file, creating a .p7s as output:
    var inFile: String? = "/Users/chilkat/testData/pdf/sample.pdf"
    var sigFile: String? = "/Users/chilkat/testData/p7s/sample.p7s"

    success = crypt.createP7S(inFile, p7sPath: sigFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    success = crypt.verifyP7S(inFile, p7sPath: sigFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success!")

}