Generate RSA Public/Private Key Pair and Export to PEM

Java example code showing how to generate an RSA public/private key pair and export to PEM files.

Download Chilkat Java Library

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[])
  {
    CkRsa rsa = new CkRsa();

    boolean success;
    success = rsa.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println("RSA component unlock failed");
        return;
    }

    //  Generate a 1024-bit key.  Chilkat RSA supports
    //  key sizes ranging from 512 bits to 4096 bits.
    success = rsa.GenerateKey(1024);
    if (success != true) {
        System.out.println(rsa.lastErrorText());
        return;
    }

    //  Keys are exported in XML format:
    String publicKeyXml;
    publicKeyXml = rsa.exportPublicKey();
    System.out.println(publicKeyXml);

    String privateKeyXml;
    privateKeyXml = rsa.exportPrivateKey();
    System.out.println(privateKeyXml);

    //  Save the private key in PEM format:
    CkPrivateKey privKey = new CkPrivateKey();
    privKey.LoadXml(privateKeyXml);
    privKey.SaveRsaPemFile("privateKey.pem");

    //  Save the public key in PEM format:
    CkPublicKey pubKey = new CkPublicKey();
    pubKey.LoadXml(publicKeyXml);
    pubKey.SaveOpenSslPemFile("publicKey.pem");
  }
}