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POEncrypt safe password in the mysql database using encryption function
 

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    <p>I want to encrypt password to prevent SQL injection and other attacks and I used an encryption function in PHP, but I don't know how to use it to encrypt passwords. </p> <p>I want each password in the user table to be encrypted so i can connect to the database and use a query but it doesn't work.</p> <p>Can anyone help me please?</p> <h1>ecnription.php</h1> <pre><code>&lt;?php require_once('include/connect.php'); if(isset($_SESSION['user_id'])) { $id= $_SESSION['user_id']; } $sql = mysql_query("SELECT password FROM user WHERE user_id= '$id'")or die(mysql_error()); while($row = mysql_fetch_array($sql)) { $enc_pass= $row['password']; } error_reporting(0); class Encryption { const CYPHER = MCRYPT_RIJNDAEL_256; const MODE = MCRYPT_MODE_CBC; const KEY = 'somesecretphrase'; public function encrypt($plaintext) { $td = mcrypt_module_open(self::CYPHER, '', self::MODE, ''); $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND); mcrypt_generic_init($td, self::KEY, $iv); $crypttext = mcrypt_generic($td, $plaintext); mcrypt_generic_deinit($td); return base64_encode($iv.$crypttext); } public function decrypt($crypttext) { $crypttext = base64_decode($crypttext); $plaintext = ''; $td = mcrypt_module_open(self::CYPHER, '', self::MODE, ''); $ivsize = mcrypt_enc_get_iv_size($td); $iv = substr($crypttext, 0, $ivsize); $crypttext = substr($crypttext, $ivsize); if ($iv) { mcrypt_generic_init($td, self::KEY, $iv); $plaintext = mdecrypt_generic($td, $crypttext); } return trim($plaintext); } } $encrypted_string = Encryption::encrypt($enc_pass); $decrypted_string = Encryption::decrypt($encrypted_string); echo $encrypted_string . "&lt;br&gt;" . PHP_EOL; var_dump($id); echo $decrypted_string . "&lt;br&gt;" . PHP_EOL; </code></pre>
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    1. COTo prevent SQL injection use [**escaping**](http://kunststube.net/escapism), not encryption! Properly you also don't *encrypt* passwords for storage, you *hash* them. Best way to do so is https://github.com/ircmaxell/password_compat/.
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