Created
August 20, 2014 07:55
-
-
Save salipro4ever/db1a7eeb237df5834f33 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function encrypt_decrypt($action, $string) { | |
$output = false; | |
$encrypt_method = "AES-256-CBC"; | |
$secret_key = 'This is my secret key'; | |
$secret_iv = 'This is my secret iv'; | |
// hash | |
$key = hash('sha256', $secret_key); | |
// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning | |
$iv = substr(hash('sha256', $secret_iv), 0, 16); | |
if( $action == 'encrypt' ) { | |
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv); | |
$output = base64_encode($output); | |
} | |
else if( $action == 'decrypt' ){ | |
$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv); | |
} | |
return $output; | |
} | |
$plain_txt = "This is my plain text"; | |
echo "Plain Text = $plain_txt\n"; | |
$encrypted_txt = encrypt_decrypt('encrypt', $plain_txt); | |
echo "Encrypted Text = $encrypted_txt\n"; | |
$decrypted_txt = encrypt_decrypt('decrypt', $encrypted_txt); | |
echo "Decrypted Text = $decrypted_txt\n"; | |
if( $plain_txt === $decrypted_txt ) echo "SUCCESS"; | |
else echo "FAILED"; | |
echo "\n"; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
If anybody stumbles across this code sample, it's horribly broken - please don't use it. You will never get interoperability with other implementations.
Amoungst other things, it double Base64 encodes the output and the keys and ivs used are a lower case hex string representation of the sha256 hashes, converted to bits. Line 12 is the obvious first mistake as it's taking 16 hex digits which is in fact 8 bytes.