Java

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.

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.EdDSA;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.PublicKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

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

        PrivateKey privKey = new 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.
        try {
            privKey.loadEd25519(privKeyHex, pubKeyHex);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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

        EdDSA eddsa = new EdDSA();
        String hexSig = eddsa.signBdENC(bd, "hexlower", privKey);

        System.out.println("signature = " + hexSig);

        // The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

        // Verify the signature..
        PublicKey pubKey = new PublicKey();
        try {
            pubKey.loadEd25519(pubKeyHex);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        try {
            eddsa.verifyBdENC(bd, hexSig, "hexlower", pubKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            System.out.println("Failed to verify the signature.");
            return;
        }

        System.out.println("The Ed25519 signature is verified!");
    }
}