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POEncrypt/Decrypt using mcrypt
 

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  1. POEncrypt/Decrypt using mcrypt
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    <p>Trying to achieve encrypting and decryption using following strategy, but ending up with random characters mostly.</p> <pre><code>class Crypt { public static function encrypt($string, $account) { // create a random initialization vector to use with CBC encoding $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $key = pack('H*', $account . $account); $output = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_MODE_CBC, $iv); $output = $iv . $output; $output = base64_encode($output); $output = urlencode($output); return $output; } public static function decrypt($token, $account) { $ciphertext_dec = base64_decode($token); // retrieves the IV, iv_size should be created using mcrypt_get_iv_size() $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); $iv_dec = substr($ciphertext_dec, 0, $iv_size); // retrieves the cipher text (everything except the $iv_size in the front) $ciphertext_dec = substr($ciphertext_dec, $iv_size); $key = pack('H*', $account . $account); $token = urldecode($token); $output = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec); $output = rtrim($output, ""); return $output; } } </code></pre> <p>Can't get exact values back, sometimes it decrypts but I see some garbage values, but mostly just random characters.</p> <pre><code>$a = \Crypt::encrypt("MyPassword", "1974246e"); echo \Crypt::decrypt($a, "1974246e"); </code></pre> <hr> <h2>Edits after the discussion</h2> <pre><code>class Crypt { public static function encrypt($data, $passphrase) { $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC); //create a random initialization vector to use with CBC encoding $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $key = pack('H*', $passphrase . $passphrase); return base64_encode($iv . mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_CBC, $iv)); } public static function decrypt($data, $passphrase) { $data = base64_decode($data); $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC); //retrieves the IV, iv_size should be created using mcrypt_get_iv_size() $iv = substr($data, 0, $iv_size); $data = substr($data, $iv_size); //retrieves the cipher text (everything except the $iv_size in the front) $key = pack('H*', $passphrase . $passphrase); return rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_CBC, $iv), chr(0)); } } </code></pre> <p>Usage:</p> <pre><code>$pass = "MyPassword*&amp;^*&amp;^(*&amp;^("; $token = \Crypt::encrypt($pass, "1974246e8e8a479bb0233495e8a3ed12"); $answer = \Crypt::decrypt($token, "1974246e8e8a479bb0233495e8a3ed12"); echo $answer == $pass ? "yes" : "no"; </code></pre>
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