Encrypt or Decrypt with DES Cipher Online Encrypt and decrypt text using DES for legacy compatibility.

Under the hood, it relies on the CryptoJS library to perform DES encryption and decryption operations. The process involves breaking down the input into 64-bit blocks, which are then encrypted or decrypted using a 56-bit key. This is achieved through an initial permutation, followed by 16 Feistel rounds that use a key schedule generated via PC-1, shifts, and PC-2 transformations. CryptoJS specifically uses CBC mode with PKCS7 padding and EVP_BytesToKey for key derivation. When the user selects encryption or decryption mode, it triggers a callback function that handles the operation using the provided input and key.

The tool's implementation also utilizes React state management to store and update the input, output, key, and error messages in real-time. The useState hook is used to initialize these states, while useCallback ensures that functions like process and handleCopy are only re-created when their dependencies change. When an error occurs during encryption or decryption, it catches the exception and sets an error message using the setError state function. In terms of data handling, it uses JavaScript's built-in string type to represent both plaintext and ciphertext, allowing for easy input and output operations.

In addition to CryptoJS, the tool also employs other technologies like React's cn utility for conditional class names and a custom copyToClipboard function from the @/lib/utils module. The glass-card, glass-button, and glass-input CSS classes are used throughout the interface to provide a consistent design language. When the user clicks on the Copy button, it calls the handleCopy function which attempts to write the output text to the clipboard using the copyToClipboard function, providing visual feedback through the copied state variable.