(Swift 3,4,5...) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

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Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

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

    let rsa = CkoRsa()!

    // Load the .pfx/.p12
    let pfx = CkoPfx()!
    var success: Bool = pfx.loadFile("qa_data/pfx/myKey.p12", password: "myPassword")
    if success != true {
        print("\(pfx.lastErrorText!)")
        return
    }

    // Get the default private key.
    var privKey: CkoPrivateKey? = pfx.getPrivateKey(0)
    if pfx.lastMethodSuccess != true {
        print("\(pfx.lastErrorText!)")
        return
    }

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

    privKey = nil

    // Get the signature in base64
    rsa.encodingMode = "base64"

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

    // Sign the string using the sha256 hash algorithm.
    // Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
    var base64Sig: String? = rsa.signStringENC(strData, hashAlg: "sha256")

    print("\(base64Sig!)")

    print("Success!")

}