John Davidson

Message:

I am using following snippet to do AES encryption for CBC 256 mode in PHP.

$iv_real = "ahc/2u6F0Yvww12fyQiZWA==";

$decoded_iv = base64_decode($iv_real);

$plaintext_shared_secret = "9b8a3e600073de05e5d095b5d909043e50f5047ffcd0048c01c65ca690b7b4e981e51b59641d4ffd5a140c27f25a761ab0f99e601b59c5ae3427c751bfae9331";

echo "Shared secret: {$plaintext_shared_secret}\r\n";

$aes_key = hash("sha256", "[email protected]"); 

$encrypted_shared_secret = openssl_encrypt(

    $plaintext_shared_secret, 

    "aes-256-cbc", 

    $aes_key,

    OPENSSL_ZERO_PADDING,

    $decoded_iv //Binary data

);

//Base64 encoded, encryped shared secret

echo "\r\nEncrypted, base64_encoded, shared secret\r\n";

var_dump($encrypted_shared_secret);

Encrypted response I am getting is no where close to what I am getting in React Native. I need to Decrypt same data in ReactNative. I have tried

1. React-native-simple-crypto


2. react-native-crypto-js

But none of them seem to be working and giving the decrypted data or even get encrypted data same like I am getting using PHP.

Padding support is not in any react modules.

I had opted for ReactNative Framework imagining that its most advanced framework, but I have wasted many days in figuring this Out, so not sure how to fix this.

Following is React Code

async DecryptSharedSecret() {

//    var plaintext_secret = "9b8a3e600073de05e5d095b5d909043e50f5047ffcd0048c01c65ca690b7b4e981e51b59641d4ffd5a140c27f25a761ab0f99e601b59c5ae3427c751bfae9331";

var strIV = 'ahc/2u6F0Yvww12fyQiZWA==';

var iv_bin = Base64.Decode(strIV, strIV.length);

// Decoded value IV is in Binary when converted to Hex its 6a173fdaee85d18bf0c35d9fc9089958



var shared_secret =

  'n4gIdzwY5UsOpzGtslpRlyNjLwLla7sJWfGkfH0GHadPFjtsOxNGJgqRe9WnjYkbNjCgwvvAvQtYV1kFHTpCIS4zDJa3h/2ADHrDgC7ym3HUyMeVIWgFKRCZYeVKz8SEHmullNxWG6dCjsWEbK6yqVmpNfwJSeh0XHHDFe0/Sak=';

var shared_secret_bin = Base64.Decode(shared_secret, shared_secret.length);

// Decoded Value shared_secret is in Binary when converted to HEx for printing, Value is

// '9f8808773c18e54b0ea731adb25a519723632f02e56bbb0959f1a47c7d061da74f163b6c3b1346260a917bd5a78d891b3630a0c2fbc0bd0b585759051d3a42212e330c96b787fd800c7ac3802ef29b71d4c8c79521680529109961e54acfc4841e6ba594dc561ba7428ec5846caeb2a959a935fc0949e8745c71c315ed3f49a9'



var strKey = '[email protected]';

var keysha256 = await RNSimpleCrypto.SHA.sha256(strKey);

console.log('Key SHA 256 ===== >> ', keysha256);

// var key =

// '074bf4849734a4c3a653fc213f2734d23f5dc63ce9d6244f386276097f032ad7';



let bytes = CryptoJS.AES.decrypt(

  shared_secret_bin,

  CryptoJS.enc.Hex.parse(keysha256),

  {

    iv: iv_bin,

    mode: CryptoJS.mode.CBC,

  },

);

var decrypted = bytes.toString(CryptoJS.enc.Utf8);

console.log('Decrypted Data ', decrypted);

}
}

---

My Answer:
"1234567890123456";
$key = "abcdefghijklmnopqrstuvwx";

function encrypt($data, $key, $iv) {
$cipher = "aes-256-cbc";
$options = OPENSSL_RAW_DATA;
$encrypted = openssl_encrypt($data, $cipher, $key, $options, $iv);
return base64_encode($encrypted);
}

$encrypted_data = encrypt("Hello World", $key, $iv_real);
echo $encrypted_data;

__I am using the following snippet to decrypt the encrypted data in React Native using CryptoJS.__

import CryptoJS from 'crypto-js';

const key = 'abcdefghijklmnopqrstuvwx';
const iv = '1234567890123456';

const decrypt = (encryptedData, key, iv) => {
const cipher = CryptoJS.AES.decrypt(encryptedData, key, {
iv: iv,
mode: CryptoJS.mode.CBC,
padding: CryptoJS.pad.Pkcs7
});
return cipher.toString(CryptoJS.enc.Utf8);
}

const encryptedData = 'encrypted_data_from_php';
const decryptedData = decrypt(encryptedData, key, iv);
console.log(decryptedData);

__Make sure to replace 'encrypted_data_from_php' with the actual encrypted data received from PHP.__