(Go) Duplicate Java Secure Token Creation

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

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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

    dt := chilkat.NewCkDateTime()
    dt.SetFromCurrentSystemTime()
    timeCreated := dt.GetAsTimestamp(true)

    // Such as 2019-04-01T19:35:44-05:00
    fmt.Println(*timeCreated)

    sbToken := chilkat.NewStringBuilder()
    sbToken.Append("validityTimeMinutes:=10.0;timeCreated:=")
    sbToken.Append(*timeCreated)

    cert := chilkat.NewCert()
    success = cert.LoadPfxFile("Some path to p12/p12file_name.p12","Password_for_p12")
    if success != true {
        fmt.Println(cert.LastErrorText())
        dt.DisposeCkDateTime()
        sbToken.DisposeStringBuilder()
        cert.DisposeCert()
        return
    }

    rsa := chilkat.NewRsa()
    success = rsa.SetX509Cert(cert,true)
    if success != true {
        fmt.Println(rsa.LastErrorText())
        dt.DisposeCkDateTime()
        sbToken.DisposeStringBuilder()
        cert.DisposeCert()
        rsa.DisposeRsa()
        return
    }

    rsa.SetEncodingMode("base64url")

    signature := rsa.SignStringENC(*sbToken.GetAsString(),"sha256")
    if rsa.LastMethodSuccess() == false {
        fmt.Println(rsa.LastErrorText())
        dt.DisposeCkDateTime()
        sbToken.DisposeStringBuilder()
        cert.DisposeCert()
        rsa.DisposeRsa()
        return
    }

    sbToken.Append(";signature:=")
    sbToken.Append(*signature)

    // Base64URL encode the result
    sbToken.Encode("base64url","utf-8")
    token := sbToken.GetAsString()

    fmt.Println(*token)

    dt.DisposeCkDateTime()
    sbToken.DisposeStringBuilder()
    cert.DisposeCert()
    rsa.DisposeRsa()