Rsa Symmetric Key Encrypted Value generation using public key,symmetric key in asp.net core | How to Generate RSA Encryption use public,symmetric key in C#

Asp.net core public key encryption using with symmetric key

In ASP.NET Core, you can use RSA (Rivest-Shamir-Adleman) asymmetric encryption to encrypt a symmetric key, 

which can then be used to encrypt or decrypt data. 

Here's a general overview of how to generate an RSA-encrypted symmetric key using a public key in ASP.NET Core:

1. Generate a Symmetric Key: First, generate a symmetric key (e.g., AES) that you want to use for encryption.

2. Load the Public Key: Load the recipient's RSA public key. This can be done using the RSACryptoServiceProvider or RSA class in .NET Core,

 depending on your version.

using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
    try
    {
        // Import the public key (you can replace this with your own public key)
        string publicKeyXml = publicKeyXML; // Public key needed (Without header)
        rsa.FromXmlString(publicKeyXml);

        // Data to encrypt
        byte[] dataToEncrypt = Encoding.UTF8.GetBytes(symmetricKeyValue);  // Your Symmetric key needed

        // Encrypt the data using RSA with PKCS1Padding
        byte[] encryptedData = rsa.Encrypt(dataToEncrypt, false);

        // Convert the encrypted data to a Base64-encoded string
        string encryptedText = Convert.ToBase64String(encryptedData);
        SymmetricKeyEncryptedValueFinal = encryptedText;
    }
    catch (Exception ex)
    {
        Console.WriteLine("RSA encryption failed: " + ex.Message);
        return Ok("RSA encryption failed: " + ex.Message);
    }
}
Output: ******* (length 345)