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JSch is a pure Java implementation of SSH2
There is a newer version: 0.2.21
/*
 * Copyright (c) 2002-2018 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jsch.jce;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

public class KeyPairGenRSA implements com.jcraft.jsch.KeyPairGenRSA {
  byte[] d; // private
  byte[] e; // public
  byte[] n;

  byte[] c; // coefficient
  byte[] ep; // exponent p
  byte[] eq; // exponent q
  byte[] p; // prime p
  byte[] q; // prime q

  @Override
  public void init(int key_size) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
    keyGen.initialize(key_size, new SecureRandom());
    KeyPair pair = keyGen.generateKeyPair();

    PublicKey pubKey = pair.getPublic();
    PrivateKey prvKey = pair.getPrivate();

    d = ((RSAPrivateKey) prvKey).getPrivateExponent().toByteArray();
    e = ((RSAPublicKey) pubKey).getPublicExponent().toByteArray();
    n = ((RSAPrivateKey) prvKey).getModulus().toByteArray();

    c = ((RSAPrivateCrtKey) prvKey).getCrtCoefficient().toByteArray();
    ep = ((RSAPrivateCrtKey) prvKey).getPrimeExponentP().toByteArray();
    eq = ((RSAPrivateCrtKey) prvKey).getPrimeExponentQ().toByteArray();
    p = ((RSAPrivateCrtKey) prvKey).getPrimeP().toByteArray();
    q = ((RSAPrivateCrtKey) prvKey).getPrimeQ().toByteArray();
  }

  @Override
  public byte[] getD() {
    return d;
  }

  @Override
  public byte[] getE() {
    return e;
  }

  @Override
  public byte[] getN() {
    return n;
  }

  @Override
  public byte[] getC() {
    return c;
  }

  @Override
  public byte[] getEP() {
    return ep;
  }

  @Override
  public byte[] getEQ() {
    return eq;
  }

  @Override
  public byte[] getP() {
    return p;
  }

  @Override
  public byte[] getQ() {
    return q;
  }
}