Decrypt GLPI encrypted values with glpicrypt.key

decrypt.php

<?php

$encoded_value = base64_decode('Enconded_Base64_String');
$nonce = substr($encoded_value, 0, SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES);
$ciphertext = substr($encoded_value, SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES);
$private_key = file_get_contents('glpicrypt.key');

$decrypted = sodium_crypto_aead_xchacha20poly1305_ietf_decrypt($ciphertext, $nonce, $nonce, $private_key);
echo "Result: " . $decrypted;
?>