CODEWITHSUNDEEP
phpencryptionopenssl
oewebby
oewebby

Reputation: 37

How to decrypt this string using openssl

i'm having some trouble decrypting a string that was encrypted using openssl. I don't have access to change the encryption code, but i do have read access:

Encrypt code (unable to modify)

<?php 
$key = hex2bin("24a5d2b96b9aee2fb515c94fb36da508");
$encryptTxt = openssl_encrypt(
    "txt to encrypt",
    'AES-128-ECB',
    $key
);
?>

<a href="decrypt.php?un=<?php echo bin2hex(base64_decode($encryptTxt)) ?>">link</a>

Here is how I have attempted to decrypt:

decrypt.php


$ciphertext = $_GET['un'];

$cipher = "aes-128-ecb";
$key = hex2bin("24a5d2b96b9aee2fb515c94fb36da508");

$original_plaintext = openssl_decrypt($ciphertext, $cipher, $key);
echo "text= " . $original_plaintext;

The decrypted text is not returned on the decrypt page

Upvotes: 1

Views: 512

Answers (1)

oewebby
oewebby

Reputation: 37

SOLVED: I updated decrypt.php to the following and it returned the decrypted text

$ciphertext = $_GET['un'];
$ciphertext = hex2bin($ciphertext);
$ciphertext = base64_encode($ciphertext);

$cipher = "aes-128-ecb";
$key = hex2bin("24a5d2b96b9aee2fb515c94fb36da508");

$original_plaintext = openssl_decrypt($ciphertext, $cipher, $key);
echo "text= " . $original_plaintext;

Upvotes: 1

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