What is the error message "mcrypt_encrypt(): Key of size 8 not supported by this algorithm" indicating in PHP?

The error message "mcrypt_encrypt(): Key of size 8 not supported by this algorithm" indicates that the key being used for encryption is not of the correct size for the chosen encryption algorithm. To fix this issue, you need to ensure that the key size matches the requirements of the encryption algorithm being used. 

$key = 'secretkey'; // Make sure the key size matches the requirements of the encryption algorithm
$data = 'Hello, World!';
$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_DEV_URANDOM);

$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $data, MCRYPT_MODE_CBC, $iv);

Keywords

mcrypt_encrypt Key size algorithm error message PHP

Related Questions