Android™

Get an Ed25519 Key in Raw Hex Format

See more Ed25519 Examples

Demonstrates how to get the private and public key parts of an Ed25519 key in lowercase hex formmat.

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

Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

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

    // Load an Ed25519 key from some format..
    CkPrivateKey privKey = new CkPrivateKey();

    // This loads an Ed25519 key from an unencrypted PEM file (no password required).
    success = privKey.LoadAnyFormatFile("qa_data/eddsa/ed25519.pem","");
    if (success == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    // The key type should be "ed25519" to indicate an Ed25519 key.
    Log.i(TAG, "key type = " + privKey.keyType());

    // What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
    Log.i(TAG, "size in bits = " + String.valueOf(privKey.get_BitLength()));

    // Get the private and public key parts in raw hex format:
    CkStringBuilder sbPubKeyHex = new CkStringBuilder();
    String privKeyHex = privKey.getRawHex(sbPubKeyHex);

    // We should have a 32-byte private key (a 64 character hex string).
    Log.i(TAG, "private key = " + privKeyHex);

    // We should have a 32-byte public key (a 64 character hex string).
    Log.i(TAG, "public key = " + sbPubKeyHex.getAsString());

    // Sample output:
    // key type = ed25519
    // size in bits = 256
    // private key = d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842
    // public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}