如何使 openssl_decrypt 在 php 5 中工作

Question

openssl_decrypt is not working in PHP 5 . My server is PHP 5 and I cannot change its version. It uses many other functions and if I upgrade that won't work. My local machine is PHP 7 and the openssl_decrypt is working there.

So how can I make working the openssl_decrypt in PHP 5. Or any other alternative ways?

Also a folder say ' newfolder ' in my server is PHP 7. Here openssl_decrypt works. But I call the script(which uses openssl_decrypt function) from any other location from my server it always return false.

EDIT

PHP version of server is 5.3.28

Below is the code

$decrypt_text = openssl_decrypt($encryptedtext, "AES-128-CTR", $encrypt_key, 0, '1010101010101010');

$decrypt_text gives false in php 5.3.28.

Got warning on error reporting.

Warning: openssl_decrypt() [function.openssl-decrypt]: Unknown cipher algorithm

But works in php 7.

So issue is something related to php version.

Answer 1

The error is explaining that the cipher algorithm used AES-128-CTR is unknown. Check which cipher algorithms are available in that version of PHP using openssl_get_cipher_methods . https://www.php.net/manual/en/function.openssl-get-cipher-methods.php