🔐 AES Encryption Tool

const crypto = require('crypto');

class AESCrypto {
  constructor() {
    this.algorithm = 'aes-256-cbc';
  }
  
  // Generate random key
  generateKey() {
    return crypto.randomBytes(32); // 256 bits
  }
  
  // Generate random IV
  generateIV() {
    return crypto.randomBytes(16); // 128 bits for CBC
  }
  
  // Encrypt data
  encrypt(plaintext, key, iv) {
    const cipher = crypto.createCipher(this.algorithm, key);
    cipher.setAutoPadding(true);
    
    let encrypted = cipher.update(plaintext, 'utf8', 'base64');
    encrypted += cipher.final('base64');
    
    return {
      encrypted,
      key: key.toString('hex'),
      iv: iv.toString('hex')
    };
  }
  
  // Decrypt data
  decrypt(encrypted, key, iv) {
    const decipher = crypto.createDecipher(this.algorithm, Buffer.from(key, 'hex'));
    
    let decrypted = decipher.update(encrypted, 'base64', 'utf8');
    decrypted += decipher.final('utf8');
    
    return decrypted;
  }
}

// Usage example
const aes = new AESCrypto();
const key = aes.generateKey();
const iv = aes.generateIV();
const plaintext = "Sensitive data to encrypt";

const result = aes.encrypt(plaintext, key, iv);
console.log('Encrypted:', result.encrypted);

const decrypted = aes.decrypt(result.encrypted, result.key, result.iv);
console.log('Decrypted:', decrypted);