Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

C# UWP/WinRT Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(C# UWP/WinRT) Get E-way Bill System Access Token

Sends a request to get an E-way bill system access token.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

//  First load the public key provided by the E-way bill System
Chilkat.PublicKey pubkey = new Chilkat.PublicKey();
bool success = pubkey.LoadFromFile("qa_data/pem/eway_publickey.pem");
if (success != true) {
    Debug.WriteLine(pubkey.LastErrorText);
    return;
}

//  Encrypt the password using the RSA public key provided by eway..
string password = "my_wepgst_password";
Chilkat.Rsa rsa = new Chilkat.Rsa();
rsa.Charset = "utf-8";
rsa.EncodingMode = "base64";

success = rsa.ImportPublicKeyObj(pubkey);
if (success != true) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

//  Returns the encrypted password as base64 (because the EncodingMode = "base64")
string encPassword = rsa.EncryptStringENC(password,false);
if (rsa.LastMethodSuccess != true) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

//  Generate a random app_key.  This should be 32 bytes (us-ascii chars)
//  We need 32 bytes because we'll be doing 256-bit AES ECB encryption, and 32 bytes = 256 bits.
Chilkat.Prng prng = new Chilkat.Prng();
//  Generate a random string containing some numbers, uppercase, and lowercase.
string app_key = prng.RandomString(32,true,true,true);

Debug.WriteLine("app_key = " + app_key);

//  RSA encrypt the app_key.
string encAppKey = rsa.EncryptStringENC(app_key,false);
if (rsa.LastMethodSuccess != true) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

//  Prepare the JSON body for the HTTP POST that gets the access token.
Chilkat.JsonObject jsonBody = new Chilkat.JsonObject();
jsonBody.UpdateString("action","ACCESSTOKEN");
//  Use your username instead of "09ABDC24212B1FK".
jsonBody.UpdateString("username","09ABDC24212B1FK");
jsonBody.UpdateString("password",encPassword);
jsonBody.UpdateString("app_key",encAppKey);

Chilkat.Http http = new Chilkat.Http();

//  Add required headers.
//  Use your ewb-user-id instead of "03AEXPR16A9M010"
http.SetRequestHeader("ewb-user-id","03AEXPR16A9M010");
//  The Gstin should be the same as the username in the jsonBody above.
http.SetRequestHeader("Gstin","09ABDC24212B1FK");
http.Accept = "application/json";

//  POST the JSON...
Chilkat.HttpResponse resp = await http.PostJson2Async("http://ewb.wepgst.com/api/Authenticate","application/json",jsonBody.Emit());
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

int respStatusCode = resp.StatusCode;
Debug.WriteLine("response status code =" + Convert.ToString(respStatusCode));
Debug.WriteLine("response body:");
Debug.WriteLine(resp.BodyStr);

if (respStatusCode != 200) {

    Debug.WriteLine("Failed in some unknown way.");
    return;
}

//  When the response status code = 200, we'll have either
//  success response like this:
//   {"status":"1","authtoken":"...","sek":"..."}
// 
//  or a failed response like this:
// 
//  {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}

//  Load the response body into a JSON object.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(resp.BodyStr);

int status = json.IntOf("status");
Debug.WriteLine("status = " + Convert.ToString(status));

if (status != 1) {
    //  Failed.  Base64 decode the error
    // {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
    //  For an invalid password, the error is: {"errorCodes":"108"}
    Chilkat.StringBuilder sbError = new Chilkat.StringBuilder();
    json.StringOfSb("error",sbError);
    sbError.Decode("base64","utf-8");
    Debug.WriteLine("error: " + sbError.GetAsString());
    return;
}

//  At this point, we know the request was entirely successful.
string authToken = json.StringOf("authtoken");

//  Decrypt the sek key using our app_key.
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
crypt.CryptAlgorithm = "aes";
crypt.CipherMode = "ecb";
crypt.KeyLength = 256;
crypt.SetEncodedKey(app_key,"us-ascii");
crypt.EncodingMode = "base64";

Chilkat.BinData bdSek = new Chilkat.BinData();
bdSek.AppendEncoded(json.StringOf("sek"),"base64");
crypt.DecryptBd(bdSek);

//  bdSek now contains the decrypted symmetric encryption key...
//  We'll use it to encrypt the JSON payloads we send.

//  Let's persist our authtoken and decrypted sek (symmetric encryption key).
//  To send EWAY requests (such as to create an e-way bill), we'll just load
//  and use these pre-obtained credentials.
Chilkat.JsonObject jsonEwayAuth = new Chilkat.JsonObject();
jsonEwayAuth.UpdateString("authToken",authToken);
jsonEwayAuth.UpdateString("decryptedSek",bdSek.GetEncoded("base64"));
jsonEwayAuth.EmitCompact = false;

Chilkat.FileAccess fac = new Chilkat.FileAccess();
fac.WriteEntireTextFile("qa_data/tokens/ewayAuth.json",jsonEwayAuth.Emit(),"utf-8",false);

Debug.WriteLine("Saved:");
Debug.WriteLine(jsonEwayAuth.Emit());

//  Sample output:
//  {
//    "authToken": "IBTeFtxNfVurg71LTzZ2r0xK7",
//    "decryptedSek": "5g1TyTie7yoslU3DrbYATa7mWyPazlODE7cEh5Vy4Ho="
//  }

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.