(Swift) RSA Sign utf-8 Byte Representation of String

Demontstrates how to sign the utf-8 byte representation of a string.

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    var success: Bool = false

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Load an RSA private key for signing.
    let privKey = CkoPrivateKey()!
    success = privKey.loadEncryptedPemFile("qa_data/pem/rsa_passwd.pem", password: "passwd")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    let rsa = CkoRsa()!
    success = rsa.use(privKey)
    if success == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    var originalData: String? = "This is the string to be hashed an RSA signed."

    // Indicate that we want the utf-8 byte representation of the string to be signed
    rsa.charset = "utf-8"

    // We want the RSA signature in base64 format
    rsa.encodingMode = "base64"

    var sigBase64: String? = rsa.signStringENC(originalData, hashAlg: "sha256")
    print("\(sigBase64!)")

}