# Text Encryption and Masking Utility

This module provides a collection of utility functions for encrypting, decrypting, hashing, and masking sensitive text data. It uses the `crypto-js` library for AES encryption/decryption and the `md5` library for generating MD5 hashes.

## Table of Contents
- [Installation](#installation)
- [Functions](#functions)
  - [encryptText](#encrypttext)
  - [decryptText](#decrypttext)
  - [searchTerm](#searchterm)
  - [generateMd5Terms](#generatemd5terms)
  - [hashText](#hashtext)
  - [maskingText](#maskingtext)
  - [maskSensitiveData](#masksensitivedata)
- [Usage Examples](#usage-examples)
- [Dependencies](#dependencies)
- [License](#license)

## Installation

Install the required dependencies using npm:

```bash
npm install crypto-js md5

Functions

encryptText(text: string, key: string): EncryptTextProps

Encrypts a given text using AES encryption and generates MD5 hashes for individual words.

• Parameters:
  • text: The input text to encrypt.
  • key: The encryption key for AES.
• Returns: An object of type EncryptTextProps containing:
  • encrypted: The AES-encrypted text.
  • terms: An array of MD5 hashes for each word in the input text.

decryptText(encryptedText: string, key: string): string

Decrypts an AES-encrypted text using the provided key.

• Parameters:
  • encryptedText: The encrypted text to decrypt.
  • key: The decryption key.
• Returns: The decrypted plain text.
• Note: Ensure the correct key is used; otherwise, decryption will fail.

searchTerm(text: string): string

Generates an MD5 hash for a given text.

• Parameters:
  • text: The input text to hash.
• Returns: The MD5 hash of the input text.

generateMd5Terms(input: string): string[]

Splits the input text into words and generates an MD5 hash for each word.

• Parameters:
  • input: The input text to process.
• Returns: An array of MD5 hashes, one for each word (converted to lowercase).

hashText(word: string): string

Generates an MD5 hash for a single word.

• Parameters:
  • word: The word to hash.
• Returns: The MD5 hash of the word.

maskingText(word: string): string

Masks a word by keeping the first and last characters and replacing the middle with asterisks (*).

• Parameters:
  • word: The word to mask.
• Returns: The masked word.
• Behavior:
  • If the word is 2 or fewer characters, it is fully replaced with asterisks.
  • Otherwise, only the middle characters are masked.

maskSensitiveData(text: string): string

Masks sensitive data in the text, such as names, addresses, phone numbers, and emails, by randomly replacing characters with asterisks.

• Parameters:
  • text: The input text containing sensitive data.
• Returns: The text with sensitive data masked.
• Patterns Matched:
  • Names: Words starting with a capital letter followed by lowercase letters.
  • Addresses: Patterns like "123 Street Name".
  • Phone numbers: Formats like "123-456-7890" or "123 456 7890".
  • Emails: Standard email formats like "[email protected]".

Usage Examples

import { encryptText, decryptText, maskSensitiveData, maskingText } from './textUtils';

// Encrypt and decrypt text
const { encrypted, terms } = encryptText("Hello world", "my-secret-key");
console.log("Encrypted:", encrypted);
console.log("MD5 Terms:", terms);

const decrypted = decryptText(encrypted, "my-secret-key");
console.log("Decrypted:", decrypted); // Output: Hello world

// Mask a single word
console.log(maskingText("hello")); // Output: h***o
console.log(maskingText("hi")); // Output: **

// Mask sensitive data
const sensitiveText = "Contact John Doe at 123-456-7890 or [email protected]";
console.log(maskSensitiveData(sensitiveText));
// Possible Output: Contact J**n D*e at 1*3-4*6-7*90 or j**n.d*e@e****le.c*m

Dependencies

• crypto-js: For AES encryption and decryption.
• md5: For generating MD5 hashes.

License

This project is licensed under the MIT License. See the LICENSE file for details.

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