Node.js

Ed25519 Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519 signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.83 or greater.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var privKeyHex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93";
    var pubKeyHex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde";

    var privKey = new chilkat.PrivateKey();
    // This example shows only one way of loading an Ed25519 private key.
    // Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
    // You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
    success = privKey.LoadEd25519(privKeyHex,pubKeyHex);
    if (success == false) {
        console.log(privKey.LastErrorText);
        return;
    }

    // The data to be signed...
    var bd = new chilkat.BinData();
    bd.AppendString("Message for Ed25519 signing","utf-8");

    var eddsa = new chilkat.EdDSA();
    var hexSig = eddsa.SignBdENC(bd,"hexlower",privKey);

    console.log("signature = " + hexSig);

    // The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

    // Verify the signature..
    var pubKey = new chilkat.PublicKey();
    success = pubKey.LoadEd25519(pubKeyHex);
    if (success == false) {
        console.log(pubKey.LastErrorText);
        return;
    }

    var bVerified = eddsa.VerifyBdENC(bd,hexSig,"hexlower",pubKey);
    if (bVerified == false) {
        console.log(eddsa.LastErrorText);
        console.log("Failed to verify the signature.");
        return;
    }

    console.log("The Ed25519 signature is verified!");

}

chilkatExample();