(Swift 3,4,5...) Sign a File to Create a .p7s (Detached Signature)

Swift 3,4,5... 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.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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
    }

    var cert: CkoCert? = certStore.findCert(bySubjectCN: signingCertSubject)
    if certStore.lastMethodSuccess == 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!)")
        cert = nil
        return
    }

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

    cert = nil

    print("Success!")

}