(Swift 3,4,5...) RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA 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.

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    let certStore = CkoCertStore()!

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    var success: Bool = certStore.loadPfxFile("chilkat.pfx", password: "test")
    if success != true {
        print("\(certStore.lastErrorText!)")
        return
    }

    var cert: CkoCert? = certStore.findCert(bySubject: "Chilkat Software, Inc.")
    if certStore.lastMethodSuccess == false {
        print("\(certStore.lastErrorText!)")
        return
    }

    var pkey: CkoPrivateKey? = cert!.exportPrivateKey()
    if cert!.lastMethodSuccess == false {
        print("\(cert!.lastErrorText!)")
        cert = nil
        return
    }

    cert = nil

    // Get the private key in XML format:
    var pkeyXml: String? = pkey!.getXml()

    let rsa = CkoRsa()!

    // Import the private key into the RSA component:
    success = rsa.importPrivateKey(pkeyXml)
    if success != true {
        print("\(rsa.lastErrorText!)")
        pkey = nil
        return
    }

    // Encode the signature as a hex string
    rsa.encodingMode = "hex"

    var strData: String? = "This is the string to be signed."

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "sha-256", "md2" and "md5".
    var hexSig: String? = rsa.signStringENC(strData, hashAlg: "sha-1")

    print("\(hexSig!)")

    pkey = nil

    print("Success!")

}