openssl_decrypt

(PHP 5 >= 5.3.0)

openssl_decryptVerinin şifresini çözer

Açıklama

string openssl_decrypt ( string $veri , string $yöntem , string $parola [, string $ham_girdi = false ] )

Bir ham veya base64 kodlu bir dizgeyi veri olarak alıp belirtilen yöntem ve parola'yı kullanarak verinin şifresini çözer.

Uyarı

Bu işlev hala belgelendirilmemiştir; sadece değiştirge listesi mevcuttur.

Değiştirgeler

veri

Şifresi çözülecek veri.

yöntem

Şifreleme yöntemi.

parola

Parola.

ham_girdi

TRUE belirtilirse veri değiştirgesinde ham bir dizge, FALSE belirtilirse base64 kodlu bir dizge bulunduğu varsayılır.

Dönen Değerler

İşlem başarısız olursa FALSE yoksa şifresi çözülmüş veriyi bir dizge olarak döndürür.

Hatalar/İstisnalar

yöntem değiştirgesi ile bilinmeyen bir şifreleme algoritması belirtilmişse E_WARNING seviyesinde bir hata oluşur.

Ayrıca Bakınız

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User Contributed Notes 2 notes

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2
nbari at dalmp dot com
2 years ago
There are cases where you need to send data in a secure way within an 'un-secure' connection, a  typically scenario of this, is a site with out SSL (no https).

For this cases you can use the GibberishAES javascript library, this library will encrypt your data before it is submitted using CBC AES encryption mode, and it is fully compatible with a standar like OpenSSL.

Example:

When displaying a form, you can set a hidden field containing a token, the one is stored on the server via sessions and is going to be used as the 'password' for encrypting the data on the user side, in help with the GibberishAES library.

In Javascript (user side):
// GibberishAES.enc(string, password)
// Defaults to 256 bit encryption
GibberishAES.enc("Made with Gibberish\n", "password");
// Outputs: "U2FsdGVkX1+21O5RB08bavFTq7Yq/gChmXrO3f00tvJaT55A5pPvqw0zFVnHSW1o"

Later when the user submits the data, you will need to decrypt the data, for that you could use the class below and use it like this:

<?php
sqAES
::decrypt('password', 'U2FsdGVkX1+21O5RB08bavFTq7Yq/gChmXrO3f00tvJaT55A5pPvqw0zFVnHSW1o');
?>

That will return  the same result, that openssl would return from this command line :

echo "U2FsdGVkX1+21O5RB08bavFTq7Yq/gChmXrO3f00tvJaT55A5pPvqw0zFVnHSW1o" | openssl enc -d -aes-256-cbc -a -k password

This class currently only encrypts/decrypts AES256 but can be easily modified to feed your needs, right now it is fully compatible withe the  GibberishAES library, so you could decrypt all your users data and also send encrypted data back to the user in a secure way, all this thanks to the openssl-decrypt/openssl-encrypt functions.

<?php

class sqAES {

 
/**
   * decrypt AES 256
   *
   * @param string $password
   * @param data $edata
   * @return dencrypted data
   */
 
public static function decrypt($password, $edata) {
   
$data = base64_decode($edata);
   
$salt = substr($data, 8, 8);
   
$ct = substr($data, 16);
   
/**
     * From https://github.com/mdp/gibberish-aes
     *
     * Number of rounds depends on the size of the AES in use
     * 3 rounds for 256
     *        2 rounds for the key, 1 for the IV
     * 2 rounds for 128
     *        1 round for the key, 1 round for the IV
     * 3 rounds for 192 since it's not evenly divided by 128 bits
     */
   
$rounds = 3;
   
$data00 = $password.$salt;
   
$md5_hash = array();
   
$md5_hash[0] = md5($data00, true);
   
$result = $md5_hash[0];
    for (
$i = 1; $i < $rounds; $i++) {
     
$md5_hash[$i] = md5($md5_hash[$i - 1].$data00, true);
       
$result .= $md5_hash[$i];
    }
   
$key = substr($result, 0, 32);
   
$iv  = substr($result, 32,16);

      return
openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv);
  }

 
/**
   * crypt AES 256
   *
   * @param string $password
   * @param data $data
   * @return base64 encrypted data
   */
 
public static function crypt($password, $data) {
   
// Set a random salt
   
$salt = openssl_random_pseudo_bytes(8);

   
$salted = '';
   
$dx = '';
   
// Salt the key(32) and iv(16) = 48
   
while (strlen($salted) < 48) {
     
$dx = md5($dx.$password.$salt, true);
     
$salted .= $dx;
    }

   
$key = substr($salted, 0, 32);
   
$iv  = substr($salted, 32,16);

   
$encrypted_data = openssl_encrypt($data, 'aes-256-cbc', $key, true, $iv);
    return
base64_encode('Salted__' . $salt . $encrypted_data);
  }

}

?>
up
1
ittasks at gmail dot com
1 year ago
in case that hosting do not provide openssl_encrypt decrypt functions - it could be mimiced via commad prompt executions 
this functions will check is if openssl is installed and try to use it by default

function sslPrm()
{
 return array("your_password","IV (optional)","aes-128-cbc");
}
function sslEnc($msg)
{
  list ($pass, $iv, $method)=sslPrm();
  if(function_exists('openssl_encrypt'))
     return urlencode(openssl_encrypt(urlencode($msg), $method, $pass, false, $iv));
  else
     return urlencode(exec("echo \"".urlencode($msg)."\" | openssl enc -".urlencode($method)." -base64 -nosalt -K ".bin2hex($pass)." -iv ".bin2hex($iv)));
}
function sslDec($msg)
{
  list ($pass, $iv, $method)=sslPrm();
  if(function_exists('openssl_decrypt'))
     return trim(urldecode(openssl_decrypt(urldecode($msg), $method, $pass, false, $iv)));
  else
     return trim(urldecode(exec("echo \"".urldecode($msg)."\" | openssl enc -".$method." -d -base64 -nosalt -K ".bin2hex($pass)." -iv ".bin2hex($iv))));
}

//example of usage:
$r= sslEnc("This is encryption/decryption test!");
echo "<br>\n".$r.":".sslDec($r);
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