content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.util;
  
  import com.actiontech.dble.config.util.ConfigException;
  
  import javax.crypto.Cipher;
  import java.security.*;
  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;
  
  /**
   * @author songwie
   */
  public final class DecryptUtil {
      private DecryptUtil() {
      }
  
      @SuppressWarnings("SpellCheckingInspection")
      private static final String DEFAULT_PRIVATE_KEY_STRING = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAocbCrurZGbC5GArEHKlAfDSZi7gFBnd4yxOt0rwTqKBFzGyhtQLu5PRKjEiOXVa95aeIIBJ6OhC2f8FjqFUpawIDAQABAkAPejKaBYHrwUqUEEOe8lpnB6lBAsQIUFnQI/vXU4MV+MhIzW0BLVZCiarIQqUXeOhThVWXKFt8GxCykrrUsQ6BAiEA4vMVxEHBovz1di3aozzFvSMdsjTcYRRo82hS5Ru2/OECIQC2fAPoXixVTVY7bNMeuxCP4954ZkXp7fEPDINCjcQDywIgcc8XLkkPcs3Jxk7uYofaXaPbg39wuJpEmzPIxi3k0OECIGubmdpOnin3HuCP/bbjbJLNNoUdGiEmFL5hDI4UdwAdAiEAtcAwbm08bKN7pwwvyqaCBC//VnEWaq39DCzxr+Z2EIk=";
      @SuppressWarnings("SpellCheckingInspection")
      private static final String DEFAULT_PUBLIC_KEY_STRING = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKHGwq7q2RmwuRgKxBypQHw0mYu4BQZ3eMsTrdK8E6igRcxsobUC7uT0SoxIjl1WveWniCASejoQtn/BY6hVKWsCAwEAAQ==";
  
      public static void main(String[] args) throws Exception {
          String password = args[0];
          System.out.println(encrypt(password));
      }
  
      public static String decrypt(boolean usingDecrypt, String user, String password) {
          if (usingDecrypt) {
              //type:user:password
              //0:test:test
              try {
                  String[] passwords = DecryptUtil.decrypt(password).split(":");
                  if (passwords.length == 3 && "0".equals(passwords[0]) && user.equals(passwords[1])) {
                      return passwords[2];
                  }
              } catch (Exception e2) {
                  throw new ConfigException("user " + user + " password need to decrypt ,but failed !", e2);
              }
              throw new ConfigException("user " + user + " password need to decrypt, but the result is not obey the encryption rule!");
          }
          return password;
      }
  
      private static String decrypt(String cipherText) throws Exception {
          return decrypt((String) null, cipherText);
      }
  
      private static String decrypt(String publicKeyText, String cipherText)
              throws Exception {
          PublicKey publicKey = getPublicKey(publicKeyText);
  
          return decrypt(publicKey, cipherText);
      }
  
      private static String decrypt(PublicKey publicKey, String cipherText)
              throws Exception {
          Cipher cipher = Cipher.getInstance("RSA");
          try {
              cipher.init(Cipher.DECRYPT_MODE, publicKey);
          } catch (InvalidKeyException e) {
              //  IBM JDK not support Private key encryption, public key decryption
              // so fake an PrivateKey for it
              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 dbHostDecrypt(boolean usingDecrypt, String name, String user, String password) {
          if (usingDecrypt) {
              //type:host:user:password
              //1:my_host1:test:test
              try {
                  String[] passwords = DecryptUtil.decrypt(password).split(":");
                  if (passwords.length == 4 && "1".equals(passwords[0]) && name.equals(passwords[1]) && user.equals(passwords[2])) {
                      return passwords[3];
                  }
              } catch (Exception e2) {
                  throw new ConfigException("host " + name + ",user " + user + " password need to decrypt, but failed !", e2);
              }
              throw new ConfigException("host " + name + ",user " + user + " password need to decrypt, but the result is not obey the encryption rule!");
          }
          return password;
      }
  
  
      private static PublicKey getPublicKey(String publicKeyText) {
          if (publicKeyText == null || publicKeyText.length() == 0) {
              publicKeyText = DecryptUtil.DEFAULT_PUBLIC_KEY_STRING;
          }
  
          try {
              byte[] publicKeyBytes = Base64.base64ToByteArray(publicKeyText);
              X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(
                      publicKeyBytes);
  
              KeyFactory keyFactory = KeyFactory.getInstance("RSA");
              return keyFactory.generatePublic(x509KeySpec);
          } catch (Exception e) {
              throw new IllegalArgumentException("Failed to get public key", e);
          }
      }
  
  
      public static String encrypt(String plainText) throws Exception {
          return encrypt((String) null, plainText);
      }
  
      private 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);
      }
  
      private static String encrypt(byte[] keyBytes, String plainText)
              throws Exception {
          PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
          KeyFactory factory = KeyFactory.getInstance("RSA");
          PrivateKey privateKey = factory.generatePrivate(spec);
          Cipher cipher = Cipher.getInstance("RSA");
          try {
              cipher.init(Cipher.ENCRYPT_MODE, privateKey);
          } catch (InvalidKeyException e) {
              //For IBM JDK
              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"));
          return Base64.byteArrayToBase64(encryptedBytes);
      }
  
      private static byte[][] genKeyPairBytes(int keySize)
              throws NoSuchAlgorithmException {
          byte[][] keyPairBytes = new byte[2][];
  
          KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
          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 {
          byte[][] keyPairBytes = genKeyPairBytes(keySize);
          String[] keyPairs = new String[2];
  
          keyPairs[0] = Base64.byteArrayToBase64(keyPairBytes[0]);
          keyPairs[1] = Base64.byteArrayToBase64(keyPairBytes[1]);
  
          return keyPairs;
      }
  
      static class Base64 {
  
          /**
           * Translates the specified byte array into a Base64 string as per Preferences.put(byte[]).
           */
          static String byteArrayToBase64(byte[] a) {
              return byteArrayToBase64(a, false);
          }
  
          private static String byteArrayToBase64(byte[] a, boolean alternate) {
              int aLen = a.length;
              int numFullGroups = aLen / 3;
              int numBytesInPartialGroup = aLen - 3 * numFullGroups;
              int resultLen = 4 * ((aLen + 2) / 3);
              StringBuilder result = new StringBuilder(resultLen);
              char[] intToAlpha = (alternate ? INT_TO_ALT_BASE_64 : INT_TO_BASE_64);
  
              // Translate all full groups from byte array elements to Base64
              int inCursor = 0;
              for (int i = 0; i < numFullGroups; i++) {
                  int byte0 = a[inCursor++] & 0xff;
                  int byte1 = a[inCursor++] & 0xff;
                  int byte2 = a[inCursor++] & 0xff;
                  result.append(intToAlpha[byte0 >> 2]);
                  result.append(intToAlpha[(byte0 << 4) & 0x3f | (byte1 >> 4)]);
                  result.append(intToAlpha[(byte1 << 2) & 0x3f | (byte2 >> 6)]);
                  result.append(intToAlpha[byte2 & 0x3f]);
              }
  
              // Translate partial group if present
              if (numBytesInPartialGroup != 0) {
                  int byte0 = a[inCursor++] & 0xff;
                  result.append(intToAlpha[byte0 >> 2]);
                  if (numBytesInPartialGroup == 1) {
                      result.append(intToAlpha[(byte0 << 4) & 0x3f]);
                      result.append("==");
                  } else {
                      // assert numBytesInPartialGroup == 2;
                      int byte1 = a[inCursor++] & 0xff;
                      result.append(intToAlpha[(byte0 << 4) & 0x3f | (byte1 >> 4)]);
                      result.append(intToAlpha[(byte1 << 2) & 0x3f]);
                      result.append('=');
                  }
              }
              // assert inCursor == a.length;
              // assert result.length() == resultLen;
              return result.toString();
          }
  
          /**
           * Translates the specified byte array into an "alternate representation" Base64 string. This non-standard variant
           * uses an alphabet that does not contain the uppercase alphabetic characters, which makes it suitable for use in
           * situations where case-folding occurs.
           */
          public static String byteArrayToAltBase64(byte[] a) {
              return byteArrayToBase64(a, true);
          }
  
          /**
           * This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet"
           * equivalents as specified in Table 1 of RFC 2045.
           */
          private static final char[] INT_TO_BASE_64 = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
                  'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
                  'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2',
                  '3', '4', '5', '6', '7', '8', '9', '+', '/'};
  
          /**
           * This array is a lookup table that translates 6-bit positive integer index values into their
           * "Alternate Base64 Alphabet" equivalents. This is NOT the real Base64 Alphabet as per in Table 1 of RFC 2045. This
           * alternate alphabet does not use the capital letters. It is designed for use in environments where "case folding"
           * occurs.
           */
          private static final char[] INT_TO_ALT_BASE_64 = {'!', '"', '#', '$', '%', '&', '\'', '(', ')', ',', '-', '.', ':',
                  ';', '<', '>', '@', '[', ']', '^', '`', '_', '{', '|', '}', '~', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
                  'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2',
                  '3', '4', '5', '6', '7', '8', '9', '+', '?'};
  
          /**
           * Translates the specified Base64 string (as per Preferences.get(byte[])) into a byte array.
           *
           * @throw IllegalArgumentException if <tt>s</tt> is not a valid Base64 string.
           */
          static byte[] base64ToByteArray(String s) {
              return base64ToByteArray(s, false);
          }
  
          private static byte[] base64ToByteArray(String s, boolean alternate) {
              byte[] alphaToInt = (alternate ? ALT_BASE_64_TO_INT : BASE_64_TO_INT);
              int sLen = s.length();
              int numGroups = sLen / 4;
              if (4 * numGroups != sLen) {
                  throw new IllegalArgumentException("String length must be a multiple of four.");
              }
              int missingBytesInLastGroup = 0;
              int numFullGroups = numGroups;
              if (sLen != 0) {
                  if (s.charAt(sLen - 1) == '=') {
                      missingBytesInLastGroup++;
                      numFullGroups--;
                  }
                  if (s.charAt(sLen - 2) == '=') {
                      missingBytesInLastGroup++;
                  }
              }
              byte[] result = new byte[3 * numGroups - missingBytesInLastGroup];
  
              // Translate all full groups from base64 to byte array elements
              int inCursor = 0, outCursor = 0;
              for (int i = 0; i < numFullGroups; i++) {
                  int ch0 = base64toInt(s.charAt(inCursor++), alphaToInt);
                  int ch1 = base64toInt(s.charAt(inCursor++), alphaToInt);
                  int ch2 = base64toInt(s.charAt(inCursor++), alphaToInt);
                  int ch3 = base64toInt(s.charAt(inCursor++), alphaToInt);
                  result[outCursor++] = (byte) ((ch0 << 2) | (ch1 >> 4));
                  result[outCursor++] = (byte) ((ch1 << 4) | (ch2 >> 2));
                  result[outCursor++] = (byte) ((ch2 << 6) | ch3);
              }
  
              // Translate partial group, if present
              if (missingBytesInLastGroup != 0) {
                  int ch0 = base64toInt(s.charAt(inCursor++), alphaToInt);
                  int ch1 = base64toInt(s.charAt(inCursor++), alphaToInt);
                  result[outCursor++] = (byte) ((ch0 << 2) | (ch1 >> 4));
  
                  if (missingBytesInLastGroup == 1) {
                      int ch2 = base64toInt(s.charAt(inCursor++), alphaToInt);
                      result[outCursor++] = (byte) ((ch1 << 4) | (ch2 >> 2));
                  }
              }
              // assert inCursor == s.length()-missingBytesInLastGroup;
              // assert outCursor == result.length;
              return result;
          }
  
          /**
           * Translates the specified "alternate representation" Base64 string into a byte array.
           *
           * @throw IllegalArgumentException or ArrayOutOfBoundsException if <tt>s</tt> is not a valid alternate
           * representation Base64 string.
           */
          public static byte[] altBase64ToByteArray(String s) {
              return base64ToByteArray(s, true);
          }
  
          /**
           * Translates the specified character, which is assumed to be in the "Base 64 Alphabet" into its equivalent 6-bit
           * positive integer.
           *
           * @throw IllegalArgumentException or ArrayOutOfBoundsException if c is not in the Base64 Alphabet.
           */
          private static int base64toInt(char c, byte[] alphaToInt) {
              int result = alphaToInt[c];
              if (result < 0) {
                  throw new IllegalArgumentException("Illegal character " + c);
              }
              return result;
          }
  
          /**
           * This array is a lookup table that translates unicode characters drawn from the "Base64 Alphabet" (as specified in
           * Table 1 of RFC 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64
           * alphabet but fall within the bounds of the array are translated to -1.
           */
          private static final byte[] BASE_64_TO_INT = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62,
                  -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7,
                  8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28,
                  29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51};
  
          /**
           * This array is the analogue of base64ToInt, but for the nonstandard variant that avoids the use of uppercase
           * alphabetic characters.
           */
          private static final byte[] ALT_BASE_64_TO_INT = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, -1, 62, 9, 10,
                  11, -1, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 12, 13, 14, -1, 15, 63, 16, -1, -1, -1, -1, -1, -1, -1, -1,
                  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 17, -1, 18, 19, 21, 20, 26, 27, 28,
                  29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 22, 23, 24, 25};
  
      }
  
  }
  