Package com.github.perdia.crypto

Class Crypto

java.lang.Object
com.github.perdia.crypto.Crypto
public class Crypto extends Object
Class for handling the encryption and decryption of queries

  • Constructor Summary

    Constructors
    Constructor
    Description
    Crypto()
    Constructor for the Crypto class, in which the AES key gets hashed using the SHA3-Shake128 algorithm and then stored in an instance variable.

  • Method Summary

    Modifier and Type
    Method
    Description
    byte[]
    decrypt(byte[] bytes)
    Decrypts the given byte array using AES decryption with the hashed key, also removes the buffer of zeroes at the end of the array.
    byte[]
    encrypt(byte[] bytes)
    Encrypts the given byte array using AES encryption with the hashed key, also adds a buffer of zeroes to the end of the array so the length becomes a multiple of 16.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Crypto

      public Crypto()
      Constructor for the Crypto class, in which the AES key gets hashed using the SHA3-Shake128 algorithm and then stored in an instance variable.

  • Method Details

    • encrypt

      public byte[] encrypt(byte[] bytes)
      Encrypts the given byte array using AES encryption with the hashed key, also adds a buffer of zeroes to the end of the array so the length becomes a multiple of 16.
      Parameters:
      bytes - Byte array to be encrypted
      Returns:
      Encrypted byte array including the buffer If the key given in the .env file is invalid, an InvalidKeyException is thrown and caught.
      Throws:
      AssertionError - An AssertionError gets thrown if any of the following exceptions get thrown and caught: InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException or BadPaddingException. This is because the following exceptions are made impossible to be thrown by how the code is written.

    • decrypt

      public byte[] decrypt(byte[] bytes)
      Decrypts the given byte array using AES decryption with the hashed key, also removes the buffer of zeroes at the end of the array.
      Parameters:
      bytes - Byte array to be decrypted
      Returns:
      Decrypted byte array If the padding at the end of the encrypted byte array is incorrect, a BadPaddingException is thrown and caught. If the length of the encrypted byte array is not a multiple of 16, an IllegalBlockSizeException is thrown and caught. This may be because of a server-side error. If the key given in the .env file is invalid, an InvalidKeyException is thrown and caught.
      Throws:
      AssertionError - An AssertionError gets thrown if any of the following exceptions get thrown and caught: InvalidAlgorithmParameterException, NoSuchAlgorithmException or NoSuchPaddingException. This is because the following exceptions are made impossible to be thrown by how the code is written.