(C#) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

bool success = false;

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

Chilkat.Rsa rsa = new Chilkat.Rsa();

// Assuming you already have a base64 modulus and exponent,
// wrap it in XML like this:
string modulus = "qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM=";
string exponent = "AQAB";

Chilkat.Xml xml = new Chilkat.Xml();
xml.Tag = "RSAPublicKey";
xml.NewChild2("Modulus",modulus);
xml.NewChild2("Exponent",exponent);

Chilkat.PublicKey pubKey = new Chilkat.PublicKey();
success = pubKey.LoadFromString(xml);
if (success == false) {
    Debug.WriteLine(pubKey.LastErrorText);
    return;
}

success = rsa.UsePublicKey(pubKey);
if (success == false) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

bool usePrivateKey = false;
string plainText = "message in a bottle";

rsa.EncodingMode = "base64";
string encryptedStrBase64 = rsa.EncryptStringENC(plainText,usePrivateKey);
Debug.WriteLine(encryptedStrBase64);