| public decryptCBC ( data $data, string $key, string $iv ) : data | ||
| $data | data | The data to decrypt. |
| $key | string | The base64-encoded key. |
| $iv | string | $iv The base64-encoded IV. |
| return | data | The decrypted data. |
public function decryptCBC($data, $key, $iv)
{
// Decode the key and IV.
$iv = base64_decode($iv);
$key = base64_decode($key);
// Decrypt the data.
$data = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $data, MCRYPT_MODE_CBC, $iv);
$padding = ord($data[strlen($data) - 1]);
return substr($data, 0, -$padding);
} /**
* Downloads a story's thumbnail.
*
* @param string $media_id
* The media_id of the story.
* @param string $key
* The base64-encoded key of the story.
* @param string $iv
* The base64-encoded IV of the thumbnail.
*
* @return mixed
* The thumbnail data or FALSE on failure.
*/
public function getStoryThumb($media_id, $key, $iv)
{
// Make sure we're logged in and have a valid access token.
if (!$this->auth_token || !$this->username) {
return FALSE;
}
// Retrieve encrypted story and decrypt.
$blob = parent::get('/bq/story_thumbnail?story_id=' . $media_id);
if (!empty($blob)) {
return parent::decryptCBC($blob, $key, $iv);
}
return FALSE;
}
