Data Encryption using RSA

using System;
using System.Security.Cryptography;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        string inputString = "Hello, world!";
        byte[] inputBytes = Encoding.UTF8.GetBytes(inputString);

        // Load the RSA private key from file
        string privateKeyFile = "path/to/private/key.xml";
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        string privateKeyXml = System.IO.File.ReadAllText(privateKeyFile);
        rsa.FromXmlString(privateKeyXml);

        // Encrypt the input string
        byte[] encryptedBytes = rsa.Encrypt(inputBytes, false);
        string encryptedString = Convert.ToBase64String(encryptedBytes);

        Console.WriteLine("Encrypted string: " + encryptedString);
    }
}

Hello Piyush,

Please try below code:

Function that takes a string value and an RSA private key file path as input, and returns the encrypted value as a Base64-encoded string:

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

public static string EncryptString(string valueToEncrypt, string privateKeyFilePath)
{
    // Load the private key from file
    string privateKey = File.ReadAllText(privateKeyFilePath);
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
    rsa.FromXmlString(privateKey);

    // Convert the string to a byte array
    byte[] dataToEncrypt = Encoding.UTF8.GetBytes(valueToEncrypt);

    // Encrypt the data
    byte[] encryptedData = rsa.Encrypt(dataToEncrypt, false);

    // Convert the encrypted data to a Base64-encoded string
    string encryptedValue = Convert.ToBase64String(encryptedData);

    return encryptedValue;
}

To use this function, simply call it with the string value you want to encrypt and the file path of the RSA private key:

string valueToEncrypt = "hello world";
string privateKeyFilePath = "path/to/private/key/file.pem";
string encryptedValue = EncryptString(valueToEncrypt, privateKeyFilePath);

Thanks

Naimish Makwana