content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.druid.filter.config;
  
  import com.alibaba.druid.util.Base64;
  import com.alibaba.druid.util.JdbcUtils;
  
  import javax.crypto.Cipher;
  
  import java.io.ByteArrayOutputStream;
  import java.io.FileInputStream;
  import java.security.*;
  import java.security.cert.Certificate;
  import java.security.cert.CertificateFactory;
  import java.security.interfaces.RSAPrivateKey;
  import java.security.interfaces.RSAPublicKey;
  import java.security.spec.PKCS8EncodedKeySpec;
  import java.security.spec.RSAPrivateKeySpec;
  import java.security.spec.RSAPublicKeySpec;
  import java.security.spec.X509EncodedKeySpec;
  
  @Deprecated
  public class ConfigTools {
      @Deprecated
      private static final String DEFAULT_PRIVATE_KEY_STRING = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAocbCrurZGbC5GArEHKlAfDSZi7gFBnd4yxOt0rwTqKBFzGyhtQLu5PRKjEiOXVa95aeIIBJ6OhC2f8FjqFUpawIDAQABAkAPejKaBYHrwUqUEEOe8lpnB6lBAsQIUFnQI/vXU4MV+MhIzW0BLVZCiarIQqUXeOhThVWXKFt8GxCykrrUsQ6BAiEA4vMVxEHBovz1di3aozzFvSMdsjTcYRRo82hS5Ru2/OECIQC2fAPoXixVTVY7bNMeuxCP4954ZkXp7fEPDINCjcQDywIgcc8XLkkPcs3Jxk7uYofaXaPbg39wuJpEmzPIxi3k0OECIGubmdpOnin3HuCP/bbjbJLNNoUdGiEmFL5hDI4UdwAdAiEAtcAwbm08bKN7pwwvyqaCBC//VnEWaq39DCzxr+Z2EIk=";
      @Deprecated
      public static final String DEFAULT_PUBLIC_KEY_STRING = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKHGwq7q2RmwuRgKxBypQHw0mYu4BQZ3eMsTrdK8E6igRcxsobUC7uT0SoxIjl1WveWniCASejoQtn/BY6hVKWsCAwEAAQ==";
  
      public static void main(String[] args) throws Exception {
          String password = args[0];
          String[] arr = genKeyPair(512);
          System.out.println("privateKey:" + arr[0]);
          System.out.println("publicKey:" + arr[1]);
          System.out.println("password:" + encrypt(arr[0], password));
      }
  
      public static String decrypt(String cipherText) throws Exception {
          return decrypt((String) null, cipherText);
      }
  
      public static String decrypt(String publicKeyText, String cipherText)
              throws Exception {
          PublicKey publicKey = getPublicKey(publicKeyText);
  
          return decrypt(publicKey, cipherText);
      }
  
      public static PublicKey getPublicKeyByX509(String x509File) {
          if (x509File == null || x509File.length() == 0) {
              return ConfigTools.getPublicKey(null);
          }
  
          FileInputStream in = null;
          try {
              in = new FileInputStream(x509File);
  
              CertificateFactory factory = CertificateFactory
                      .getInstance("X.509");
              Certificate cer = factory.generateCertificate(in);
              return cer.getPublicKey();
          } catch (Exception e) {
              throw new IllegalArgumentException("Failed to get public key", e);
          } finally {
              JdbcUtils.close(in);
          }
      }
  
      public static PublicKey getPublicKey(String publicKeyText) {
          if (publicKeyText == null || publicKeyText.length() == 0) {
              publicKeyText = ConfigTools.DEFAULT_PUBLIC_KEY_STRING;
          }
  
          try {
              byte[] publicKeyBytes = Base64.base64ToByteArray(publicKeyText);
              X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(
                      publicKeyBytes);
  
              KeyFactory keyFactory = KeyFactory.getInstance("RSA", "SunRsaSign");
              return keyFactory.generatePublic(x509KeySpec);
          } catch (Exception e) {
              throw new IllegalArgumentException("Failed to get public key", e);
          }
      }
  
      public static PublicKey getPublicKeyByPublicKeyFile(String publicKeyFile) {
          if (publicKeyFile == null || publicKeyFile.length() == 0) {
              return ConfigTools.getPublicKey(null);
          }
  
          FileInputStream in = null;
          try {
              in = new FileInputStream(publicKeyFile);
              ByteArrayOutputStream out = new ByteArrayOutputStream();
              int len = 0;
              byte[] b = new byte[512 / 8];
              while ((len = in.read(b)) != -1) {
                  out.write(b, 0, len);
              }
  
              byte[] publicKeyBytes = out.toByteArray();
              X509EncodedKeySpec spec = new X509EncodedKeySpec(publicKeyBytes);
              KeyFactory factory = KeyFactory.getInstance("RSA", "SunRsaSign");
              return factory.generatePublic(spec);
          } catch (Exception e) {
              throw new IllegalArgumentException("Failed to get public key", e);
          } finally {
              JdbcUtils.close(in);
          }
      }
  
      public static String decrypt(PublicKey publicKey, String cipherText)
              throws Exception {
          Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
          try {
              cipher.init(Cipher.DECRYPT_MODE, publicKey);
          } catch (InvalidKeyException e) {
              // 因为 IBM JDK 不支持私钥加密, 公钥解密, 所以要反转公私钥
              // 也就是说对于解密, 可以通过公钥的参数伪造一个私钥对象欺骗 IBM JDK
              RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
              RSAPrivateKeySpec spec = new RSAPrivateKeySpec(rsaPublicKey.getModulus(), rsaPublicKey.getPublicExponent());
              Key fakePrivateKey = KeyFactory.getInstance("RSA").generatePrivate(spec);
              cipher = Cipher.getInstance("RSA"); //It is a stateful object. so we need to get new one.
              cipher.init(Cipher.DECRYPT_MODE, fakePrivateKey);
          }
  
          if (cipherText == null || cipherText.length() == 0) {
              return cipherText;
          }
  
          byte[] cipherBytes = Base64.base64ToByteArray(cipherText);
          byte[] plainBytes = cipher.doFinal(cipherBytes);
  
          return new String(plainBytes);
      }
  
      public static String encrypt(String plainText) throws Exception {
          return encrypt((String) null, plainText);
      }
  
      public static String encrypt(String key, String plainText) throws Exception {
          if (key == null) {
              key = DEFAULT_PRIVATE_KEY_STRING;
          }
  
          byte[] keyBytes = Base64.base64ToByteArray(key);
          return encrypt(keyBytes, plainText);
      }
  
      public static String encrypt(byte[] keyBytes, String plainText)
              throws Exception {
          PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
          KeyFactory factory = KeyFactory.getInstance("RSA", "SunRsaSign");
          PrivateKey privateKey = factory.generatePrivate(spec);
          Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
          try {
              cipher.init(Cipher.ENCRYPT_MODE, privateKey);
          } catch (InvalidKeyException e) {
              //For IBM JDK, 原因请看解密方法中的说明
              RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey;
              RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(rsaPrivateKey.getModulus(), rsaPrivateKey.getPrivateExponent());
              Key fakePublicKey = KeyFactory.getInstance("RSA").generatePublic(publicKeySpec);
              cipher = Cipher.getInstance("RSA");
              cipher.init(Cipher.ENCRYPT_MODE, fakePublicKey);
          }
  
          byte[] encryptedBytes = cipher.doFinal(plainText.getBytes("UTF-8"));
          String encryptedString = Base64.byteArrayToBase64(encryptedBytes);
  
          return encryptedString;
      }
  
      public static byte[][] genKeyPairBytes(int keySize)
              throws NoSuchAlgorithmException, NoSuchProviderException {
          byte[][] keyPairBytes = new byte[2][];
  
          KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA", "SunRsaSign");
          gen.initialize(keySize, new SecureRandom());
          KeyPair pair = gen.generateKeyPair();
  
          keyPairBytes[0] = pair.getPrivate().getEncoded();
          keyPairBytes[1] = pair.getPublic().getEncoded();
  
          return keyPairBytes;
      }
  
      public static String[] genKeyPair(int keySize)
              throws NoSuchAlgorithmException, NoSuchProviderException {
          byte[][] keyPairBytes = genKeyPairBytes(keySize);
          String[] keyPairs = new String[2];
  
          keyPairs[0] = Base64.byteArrayToBase64(keyPairBytes[0]);
          keyPairs[1] = Base64.byteArrayToBase64(keyPairBytes[1]);
  
          return keyPairs;
      }
  
  }
  