(Swift 3,4,5...) Sign a File to Create a .p7m File (using a PFX)

Swift 3,4,5... 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.

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?
    cert = 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 .p7m as output:
    var inFile: String? = "/Users/chilkat/testData/pdf/sample.pdf"
    var outputFile: String? = "/Users/chilkat/testData/p7m/sample.pdf.p7m"
    success = crypt.createP7M(inFile, p7mPath: outputFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        cert = nil
        return
    }

    // Verify and restore the original file:
    success = crypt.setVerifyCert(cert)

    inFile = outputFile
    outputFile = "/Users/chilkat/testData/pdf/restored.pdf"

    success = crypt.verifyP7M(inFile, destPath: outputFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        cert = nil
        return
    }

    cert = nil

    print("Success!")

}