MainLibProj_Hrithik 2.6.1

MainLibProj_Hrithik

A powerful, production-ready .NET utility library providing FIX protocol trading, JWT RSA decryption, and Azure & document utilities — all in one package.

🧱 Installation

Install via NuGet Package Manager:

dotnet add package MainLibProj_Hrithik

Or using the Visual Studio Package Manager Console:

Install-Package MainLibProj_Hrithik

🚀 New in v2.6.1:

• Updated internal and third-party dependencies
• No functional or breaking changes
• Improves security, stability, and compatibility

🆕 MainLibProj_Hrithik — JWT RSA decryption (Latest Release)

🚀 New in v2.6.0:

🆕 Secure Transactions (JWS + JWE) — v2.6.0+

Recommended for new implementations

The Secure Transactions module introduces a banking-style, envelope-based security model for exchanging business payloads between services.

It is built on industry-standard JWT technologies:

JWS (RS256) for integrity and non-repudiation

JWE (RSA-OAEP + AES) for payload confidentiality

Time-bound tokens to mitigate replay attacks

Strongly-typed payload support

Clean separation of crypto and business logic

This approach is commonly used in banking, payment gateways, and financial middleware.

🔐 How Secure Transactions Work

Business Object ↓ JSON Serialization ↓ JWE Encryption (Confidentiality) ↓ Secure Envelope ↓ JWS Signature (Integrity) ↓ Transport (HTTP / Messaging)

✅ Secure Transaction – Usage Example

// Business payload var payload = new TestTransaction { TransactionId = "TX123", Amount = 5000, Currency = "INR" };

// Create secure token var token = secureService.CreateSecureRequest( payload, recipientPublicKey: serverPublicKey, senderPrivateKey: clientPrivateKey, options: new SecureTransactionOptions { Issuer = "bank-client", Audience = "payment-api", ExpiryMinutes = 5 });

// Validate and decrypt var result = secureService.DecryptAndValidate<TestTransaction>( token, senderPublicKey: clientPublicKey, recipientPrivateKey: serverPrivateKey);

Console.WriteLine(result.Data.TransactionId); Console.WriteLine(result.Data.Amount);

OLD PACKAGE SUMMARY FOR REVIEW:

🔐 RSA Encrypted JWT Decryption & Decoding Support using AES to resolve encryption size issue in package 2.4.0

You can now encrypt and decrypt RSA tokens, encode-decode JWTs, and extract claims securely using a simple API—without handling low-level cryptography.

✨ JWT Feature Highlights

✅ Supports PKCS#1 RSA private keys

✅ Supports PKCS#1 RSA public keys for encryption

✅ Automatically encrypts + encode JWT

✅ Accepts Base64 encrypted tokens

✅ Automatically decrypts + decodes JWT

✅ Returns Raw JWT and Claims Dictionary

✅ Ideal for APIs, Azure Functions, APIM, Microservices

⚙️ How It Works

🔐 JWT RSA ENCRYPTION – Usage Example

		 var payload = new JObject
        {
            ["dealer_id"] = "",
            ["serial_no"] = "abc"
		};
		string publicKeyPem = @"
        -----BEGIN PUBLIC KEY-----
        l54QhuRz9Lb9tuE1DBvCFn/a0zfQTQdbfNsnplaNJwIDAQAB......
        -----END PUBLIC KEY-----
        ";
        var encryptor = new HybridJwtEncryptor(
                          publicKeyPem,
                        "a-string-secret-at-least-256-bits-long"
                         );

        var encryptedPayload = encryptor.EncryptPayload(payload);


        Console.WriteLine("Encrypted JWT:");
        Console.WriteLine(encryptedPayload);

🔐 JWT RSA ENCRYPTION – Usage Example

		 var decryptorkey ="-----BEGIN RSA PRIVATE KEY-----\r\nMIIAEz89ibQKJOOnit81zmxTP.................................pvlnviB9VeJWtBU6\r\n-----END RSA PRIVATE KEY-----";

        var encryptedJson = @"{
                            ""encryptedKey"": ""FWHzWE7mV84QuT7PmUp1j7/rPTgLMWoW9EfPCWhO08giwNkQLzlebVQBe71pifeSVBHeu4q6..................TVwGu3WjrH+y5ItyUWPCOtpiuhOh+Q=="",
                            ""nonce"": ""1PksuW.........g2sgSg"",
                            ""tag"": ""nmO+ln............Tw=="",
                            ""cipherText"": ""eaaRbYvq6plPUNvpkvl4Ardcly6PpaJLredjFLiAA2X2eD3MyE064wTbi+gyd+K6ZiUBOJ+GfkvUQ/U5eNEvDIdn+.................................../aPnkq8Fu6kpcPOrk9Y7NbGxv3+KE3j5Mv5bvt7SSiD8AZQiTls+h""
                             }";

        JObject encryptedPayloads = JObject.Parse(encryptedJson);

        var decryptor = new HybridJwtDecryptor(decryptorkey);

        var decryptedClaims = decryptor.Decrypt(encryptedPayloads);

        Console.WriteLine(
            Newtonsoft.Json.JsonConvert.SerializeObject(
                decryptedClaims,
                Newtonsoft.Json.Formatting.Indented
            )
        );

🧠 Common Use Cases

Secure API-to-API authentication

Decrypting tokens from external identity providers

Azure Functions & APIM integrations

Enterprise microservice security flows

🆕 FIX Protocol Support

🚀 Introduced in v2.2.0

Integrated FIX protocol connectivity using QuickFIX/n directly into the library.

Send Equity, Fractional, Notional, Option, and Multi-Leg orders using simple JSON-based requests—no FIX expertise required.

⚙️ How FIX Support Works

Handles FIX session lifecycle

Manages authentication & heartbeats

Builds and parses FIX messages internally

Exposes a clean JSON-based API

🧩 Other Usage Example using MainLibProj_Hrithik.Fix; using System.Text.Json;

// Step 1: Configure FIX Connection var config = new FixConnectionConfig { // Required: Session identifiers SenderCompId = "", TargetCompId = "",

// Optional: Sub IDs
SenderSubId = "YOUR_SENDER_SUB_ID",
TargetSubId = "TARGET_SUB_ID",

// Optional: Authentication
Username = "YOUR_USERNAME",
Password = "YOUR_PASSWORD",

// Required: FIX configuration file path
FixSettingsFilePath = "path/to/fix.cfg",

// Certificate options
CertificatePath = "C:\\path\\to\\certificate.cer",
CertificatePassword = "cert_password_if_any",

// Connection settings
HostName = "your.fixserver.com",
Port = 12345,
ProxyPort = 15000,
HeartbeatInterval = 30,
ResponseTimeoutSeconds = 20

};

// Step 2: (Optional) Load certificate from Azure Key Vault var configWithKeyVault = new FixConnectionConfig { SenderCompId = "YOUR_SENDER_COMP_ID", TargetCompId = "FIX_TARGET_COMP_ID", Username = "YOUR_USERNAME", Password = "YOUR_PASSWORD", FixSettingsFilePath = "path/to/fix.cfg",

// Azure Key Vault integration
KeyVaultUrl = "https://your-keyvault.vault.azure.net/",
CertificateName = "fixcert"

};

// Step 3: Initialize FIX Gateway Client using var client = new FixJsonGatewayClient(config, null); await client.InitializeAsync();

// Step 4: Send Orders await SendEquityOrder(client); await SendFractionalOrder(client); await SendOptionOrder(client); await SendMultiLegOrder(client); await CancelOrder(client); await ReplaceOrder(client);

🧾 Example: Send an Equity Order static async Task SendEquityOrder(FixJsonGatewayClient client) { Console.WriteLine("\n=== Sending Equity Order ===");

var request = new FixJsonRequest
{
    MessageType = "NewOrderSingle",
    Fields = new Dictionary<string, object>
    {
        { "ClOrdID", "ORDER-" + Guid.NewGuid() },
        { "Symbol", "AAPL" },
        { "Side", "1" },          // Buy
        { "OrdType", "2" },       // Limit
        { "OrderQty", 100 },
        { "Price", 150.50 },
        { "Account", "YOUR_ACCOUNT_NUMBER" },
        { "TimeInForce", "0" },   // Day
        { "Currency", "USD" },
        { "SecurityType", "CS" }, // Common Stock
        { "ExDestination", "NASDAQ" },
        { "Rule80A", "I" }        // Individual
    }
};

var response = await client.SendMessageAsync(request);

Console.WriteLine($"Status: {response.Status}");
Console.WriteLine($"Response: {JsonSerializer.Serialize(response.Fields, new JsonSerializerOptions { WriteIndented = true })}");

if (response.Status == "Rejected")
    Console.WriteLine($"Error: {response.ErrorMessage}");

}

💡 Supported Order Types Type Method Equity SendEquityOrder() Fractional SendFractionalOrder() Option SendOptionOrder() Multi-Leg SendMultiLegOrder() Cancel CancelOrder() Replace ReplaceOrder() 🔐 Key Features

✅ Native QuickFIX/n integration

✅ Supports Azure Key Vault certificates

✅ JSON-based order structure for easy integration

✅ Plug-and-play FIX connectivity

✅ Built for Equity, Fractional, Notional, Option, and Multi-leg orders

🧠 OTHER Usage Examples 📦 Upload File to Azure Blob Storage using MainLibProj_Hrithik.AzureHelpers;

var connectionString = "DefaultEndpointsProtocol=https;AccountName=...;AccountKey=...;EndpointSuffix=core.windows.net;"; var containerName = "uploads"; var filePath = "C:\Users\Hrithik\Documents\data.json";

await BlobHelper.UploadFileAsync(connectionString, containerName, filePath); Console.WriteLine("✅ File uploaded successfully!");

🔑 Retrieve Secret from Azure Key Vault using MainLibProj_Hrithik.AzureHelpers;

var secretValue = await KeyVaultHelper.GetSecretAsync("https://myvault.vault.azure.net/", "StorageAccountKey"); Console.WriteLine($"🔒 Secret value: {secretValue}");

📊 Convert Excel File to JSON using MainLibProj_Hrithik.Converters;

var excelFilePath = "C:\Data\Orders.xlsx"; var json = ExcelConverter.ConvertToJson(excelFilePath);

Console.WriteLine(json);

📝 Convert Word Document to PDF using MainLibProj_Hrithik.Converters;

var docxPath = "C:\Docs\Invoice.docx"; var pdfPath = "C:\Docs\Invoice.pdf";

WordToPdfConverter.Convert(docxPath, pdfPath); Console.WriteLine("📄 PDF created successfully!");

🧰 Tech Stack

.NET 8.0

Azure SDK for .NET

OpenXML SDK

PdfSharpCore

Newtonsoft.Json

📄 License

MIT License

👤 Author

Hrithik Kalra

.NET | API Security | Fintech Systems

📧 Email: hrithikkalra11@gmail.com

GitHub: https://github.com/hrithikalra

LinkedIn: https://www.linkedin.com/in/hrithik-kalra-b6836a246/

If you find this package useful, consider supporting its development:

• ☕ Buy Me a Coffee: https://www.buymeacoffee.com/alkylhalid9
• ❤️ GitHub Sponsors: https://github.com/sponsors/hrithikalra

Support is entirely optional and helps sustain ongoing development and maintenance.