Encryption/Decryption

Hi Steve,

It sounds like you're dealing with encrypted data in your database and you want to access that data in your mobile app using Dart, or alternatively, using PHP. Here are some steps and tips that might help you to achieve this:

Step 1: Understand the Encryption Method

First, ensure you understand how the data is being encrypted in PHPRunner. If it's using AES (which is common), you'll need to know the encryption method (e.g., AES-128, AES-256), the mode of operation (e.g., CBC, ECB), and the key used for encryption. Make sure you have the same key available for decryption.

Step 2: Decrypting in PHP

If you're open to using PHP, you can use the openssl_decrypt function. Here's a basic example of how you might decrypt data in PHP:

function decryptData($encryptedData, $encryptionKey) {
 // Assuming you are using AES-128-CBC
 $iv = 'YOUR_INITIALIZATION_VECTOR'; // Make sure to use the same IV that was used for encryption
 $decryptedData = openssl_decrypt(base64_decode($encryptedData), 'AES-128-CBC', $encryptionKey, OPENSSL_RAW_DATA, $iv);
 return $decryptedData;
}

// Usage
$encryptedData = 'YOUR_ENCRYPTED_DATA';
$encryptionKey = 'YOUR_ENCRYPTION_KEY';
$decryptedData = decryptData($encryptedData, $encryptionKey);
echo $decryptedData;
Step 3: Decrypting in Dart
If you prefer to do it in Dart, you can use the encrypt package, which supports AES encryption and decryption. Here’s a basic example:
Add the dependency to your pubspec.yaml:

dependencies:
 encrypt: ^5.0.0
Use the encrypt package to decrypt the data:

import 'dart:convert';
import 'package:encrypt/encrypt.dart';
import 'package:encrypt/encrypt.dart' as encrypt;

String decryptData(String encryptedData, String key, String iv) {
 final keyBytes = Key.fromBase64(key);
 final ivBytes = IV.fromBase64(iv);

 final encrypter = Encrypter(AES(keyBytes));

 final decrypted = encrypter.decrypt64(encryptedData, iv: ivBytes);
 return decrypted;
}

// Usage
void main() {
 String encryptedData = 'YOUR_ENCRYPTED_DATA';
 String encryptionKey = 'YOUR_ENCRYPTION_KEY'; // Should be base64 encoded
 String initializationVector = 'YOUR_INITIALIZATION_VECTOR'; // Should be base64 encoded

 String decryptedData = decryptData(encryptedData, encryptionKey, initializationVector);
 print(decryptedData);
}
Step 4: Test and Debug
Make sure that the key and IV used in both PHP and Dart match what was used during encryption.
Ensure that the encrypted data is correctly passed to the decryption function (e.g., check for any encoding issues).
Test with known values to ensure that your decryption logic is correct.

Step 5: Secure Your Keys
Remember to keep your encryption keys and initialization vectors secure. Avoid hardcoding them directly in your source code, and consider using environment variables or secure storage mechanisms.
Conclusion
By following these steps, you should be able to decrypt your encrypted data either in PHP or Dart. If you encounter specific errors or issues, feel free to provide more details, and I can assist you further. Good luck!

The article in the manual that explains encryption/descryption also shows an example of manual data decryption:
https://xlinesoft.com/phprunner/docs/encryption.htm#decrypt

Another option, expesially since you plan to use a mobile application, you can use PHPRunner's REST API to retrieve data and it will descrypt it for you automatically.