service/src/test/java/org/apache/fineract/cn/provisioner/GenerateRsaKeyPair.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.fineract.cn.provisioner;

import java.io.BufferedWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;

public class GenerateRsaKeyPair {

  private GenerateRsaKeyPair() {
    super();
  }

  public static void main(String[] args) throws Exception {
    final GenerateRsaKeyPair generateRsaKeyPair = new GenerateRsaKeyPair();
    generateRsaKeyPair.createKeyPair();
  }

  private void createKeyPair() throws Exception {
    final KeyFactory keyFactory = KeyFactory.getInstance("RSA");

    final KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
    keyPairGenerator.initialize(2048);
    final KeyPair keyPair = keyPairGenerator.genKeyPair();

    final RSAPublicKeySpec rsaPublicKeySpec = keyFactory.getKeySpec(keyPair.getPublic(), RSAPublicKeySpec.class);
    final BufferedWriter bufferedWriterPubKey = Files.newBufferedWriter(Paths.get("/home/mage/system.pub"));
    bufferedWriterPubKey.write(rsaPublicKeySpec.getModulus().toString());
    bufferedWriterPubKey.newLine();
    bufferedWriterPubKey.write(rsaPublicKeySpec.getPublicExponent().toString());
    bufferedWriterPubKey.flush();
    bufferedWriterPubKey.close();

    final RSAPrivateKeySpec rsaPrivateKeySpec = keyFactory.getKeySpec(keyPair.getPrivate(), RSAPrivateKeySpec.class);
    final BufferedWriter bufferedWriterPrivateKey = Files.newBufferedWriter(Paths.get("/home/mage/system"));
    bufferedWriterPrivateKey.write(rsaPrivateKeySpec.getModulus().toString());
    bufferedWriterPrivateKey.newLine();
    bufferedWriterPrivateKey.write(rsaPrivateKeySpec.getPrivateExponent().toString());
    bufferedWriterPrivateKey.flush();
    bufferedWriterPrivateKey.close();

  }
}