(Swift 2) Sign a Byte Array to Create a Detached Signature in a Byte Array

Signs data contained in a byte array to produce a detached signature (also in a byte array). Also shows how to verify the signature.

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

    let fac = CkoFileAccess()

    var fileBytes: NSData
    fileBytes = fac.ReadEntireFile("qa_data/pdf/sample.pdf")
    if fac.LastMethodSuccess != true {
        print("\(fac.LastErrorText)")
        return
    }

    let crypt = CkoCrypt2()

    success = crypt.SetSigningCert(cert)

    // We can sign any type of file.
    // The result is a detached signature (a signature that does not contain the data being signed).

    var sigBytes: NSData
    sigBytes = crypt.SignBytes(fileBytes)
    if crypt.LastMethodSuccess != true {
        print("\(crypt.LastErrorText)")
        return
    }

    success = fac.WriteEntireFile("qa_output/sample.pdf.p7s", fileData: sigBytes)
    if fac.LastMethodSuccess != true {
        print("\(fac.LastErrorText)")
        return
    }

    // We can verify the detached signature like this
    var verified: Bool = crypt.VerifyBytes(fileBytes, sigData: sigBytes)
    if crypt.LastMethodSuccess != true {
        print("\(crypt.LastErrorText)")
        return
    }

    print("Verified = \(verified)")

}