(Swift 3,4,5...) Duplicate Java Secure Token Creation

Demonstrates how to duplicate some Java code that creates an RSA signature to create a base64 token.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    // This example duplicates the following Java code:

    // public X509Certificate2 cert = new X509Certificate2(@"Some path to p12/p12file_name.p12","Password_for_p12"); 
    // 
    // public string GenerateSignToken(double timeValidityMin){ 
    //   string equalsSign = ":="; 
    //   string timeCreated = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffzzz"); 
    //   string tokenTimeInfo = "validityTimeMinutes" + equalsSign + timeValidityMin + ";"+"timeCreated" + equalsSign + timeCreated; 
    //   string signature = SignData(tokenTimeInfo); 
    //   string secureToken = tokenTimeInfo + ";" + "signature" + equalsSign + signature; 
    //   return Base64UrlEncode(secureToken); 
    // } 
    //  
    // public string SignData(string stringToSign){ 
    //   byte[] dataToSign = Encoding.UTF8.GetBytes(stringToSign); 
    //   RSACryptoServiceProvider privKey = (RSACryptoServiceProvider)cert.PrivateKey; 
    //   CspKeyContainerInfo containerInfo = new RSACryptoServiceProvider().CspKeyContainerInfo; 
    //   CspParameters cspparams = new CspParameters(containerInfo.ProviderType, containerInfo.ProviderName, privKey.CspKeyContainerInfo.KeyContainerName); 
    //   privKey = new RSACryptoServiceProvider(cspparams); 
    //   string id = CryptoConfig.MapNameToOID("SHA256"); 
    //   byte[] sign = privKey.SignData(dataToSign, id); 
    //   bool res = privKey.VerifyData(dataToSign, id, sign); 
    //   return Convert.ToBase64String(sign).Replace('+', '-').Replace('/', '_').Replace("=", ""); 
    // } 
    //  
    // private static string Base64UrlEncode(string input){ 
    //   var inputBytes = Encoding.UTF8.GetBytes(input); 
    //   return Convert.ToBase64String(inputBytes).Replace('+', '-').Replace('/', '_').Replace("=", ""); 
    // } 

    var success: Bool

    let dt = CkoDateTime()!
    dt.setFromCurrentSystemTime()
    var timeCreated: String? = dt.getAsTimestamp(true)

    // Such as 2019-04-01T19:35:44-05:00
    print("\(timeCreated!)")

    let sbToken = CkoStringBuilder()!
    sbToken.append("validityTimeMinutes:=10.0;timeCreated:=")
    sbToken.append(timeCreated)

    let cert = CkoCert()!
    success = cert.loadPfxFile("Some path to p12/p12file_name.p12", password: "Password_for_p12")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    let rsa = CkoRsa()!
    success = rsa.setX509Cert(cert, usePrivateKey: true)
    if success != true {
        print("\(rsa.lastErrorText!)")
        return
    }

    rsa.encodingMode = "base64url"

    var signature: String? = rsa.signStringENC(sbToken.getAsString(), hashAlg: "sha256")
    if rsa.lastMethodSuccess == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    sbToken.append(";signature:=")
    sbToken.append(signature)

    // Base64URL encode the result
    sbToken.encode("base64url", charset: "utf-8")
    var token: String? = sbToken.getAsString()

    print("\(token!)")

}