Utilizare openssl_encrypt si openssl_decrypt in PHP

Curs Php-mysql

Functiile openssl_encrypt() si openssl_decrypt() pot fi utilizate pentru a cripta si decripta text in PHP.
Pot fi utile la criptarea si decriptarea parolei intr-un script de inregistrare /logare.

- Iata un exemplu simplu cu functiile openssl_encrypt() si openssl_decrypt().

<?php
$password = 'user_pass'; //password added by user $_POST['password']
$key_enc = '1234'; //key for encrypt
$met_enc = 'aes256'; //method to encrypt: aes128, aes192, aes256, blowfish, cast-cbc
$iv = '16_characters_ok'; //a random string with 16 characters

//encrypts the password
$pass_enc = openssl_encrypt($password, $met_enc, $key_enc, 0, $iv);
echo $pass_enc; // "uw4QKRUsG+l17w5epb7nKw=="

//decrypts the encrypted password, it uses the same arguments: $met_enc, $key_enc, $opt=0, $iv
$pass_enc ='uw4QKRUsG+l17w5epb7nKw=='; //the encrypted password
$pass = openssl_decrypt($pass_enc, $met_enc, $key_enc, 0, $iv);
echo '<br>'.$pass; // "user_pass"
?>

Observati ca functia openssl_decrypt() trebuie sa foloseasca aceleasi argumente (aici: $met_enc, $key_enc, $opt=0, $iv) pentru decriptarea sirului criptat cu openssl_encrypt().

<input type="checkbox" name="a_name" value="value" checked="checked" />

#id {
  background:url("path_to_image.png");
  background-size:contain;
  background-repeat:no-repeat;
}

var rest8_7 = 8 % 7;
alert(rest8_7);

$nr = ceil(3.5);
echo $nr;        // 4

Alex wants to buy a bike.
- Alex vrea sa cumpere o bicicleta.

Leí unos libros.
- Am citit niste carti.