Node.js

Convert RSA Private Key to Public Key

See more RSA Examples

Demonstrates how to get a public RSA key from a private RSA key. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var privKey = new chilkat.PrivateKey();

    // Step 1: Load the private key from a source.
    // (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
    // see the online reference documentation for more options.)
    success = privKey.LoadPemFile("qa_data/pem/VP_Private.pem");
    if (success == false) {
        console.log(privKey.LastErrorText);
        return;
    }

    // Step 2: Get the public key object from the private key object.
    var pubKey = new chilkat.PublicKey();
    privKey.ToPublicKey(pubKey);

    // Step 3: Save the public key in a desired format. 
    // (Chilkat can load or save public and private keys in many different formats.  See
    // the online reference documentation for more options.)

    // Saves to a PKCS8 PEM file.
    var bPreferPkcs1 = false;
    success = pubKey.SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem");
    if (pubKey.LastMethodSuccess == false) {
        console.log(pubKey.LastErrorText);
        return;
    }

    console.log("Extracted and saved public key from private key.");

}

chilkatExample();