(Java) Get an Ed25519 Key in Raw Hex Format

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.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // 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).
    boolean success = privKey.LoadAnyFormatFile("qa_data/eddsa/ed25519.pem","");
    if (success == false) {
        System.out.println(privKey.lastErrorText());
        return;
        }

    // The key type should be "ed25519" to indicate an Ed25519 key.
    System.out.println("key type = " + privKey.keyType());

    // What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
    System.out.println("size in bits = " + 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).
    System.out.println("private key = " + privKeyHex);

    // We should have a 32-byte public key (a 64 character hex string).
    System.out.println("public key = " + sbPubKeyHex.getAsString());

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