openssl_csr_sign
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);
}
}
?>
openssl_decrypt
(PHP 5 >= 5.3.0)
openssl_decrypt — Decrypts data
Description
string openssl_decrypt
( string
$data
, string $method
, string $password
[, int $options = 0
[, string $iv = ""
]] )Takes a raw or base64 encoded string and decrypts it using a given method and key.
Warning
This function is currently not documented; only its argument list is available.
Parameters
-
data -
The data.
-
method -
The cipher method.
-
password -
The password.
-
options -
optionscan be one ofOPENSSL_RAW_DATA,OPENSSL_ZERO_PADDING. -
iv -
A non-NULL Initialization Vector.
Return Values
The decrypted string on success or FALSE on failure.
Errors/Exceptions
Emits an E_WARNING level error if an unknown cipher algorithm
is passed via the method parameter.
Emits an E_WARNING level error if an empty value is passed
in via the iv parameter.
Changelog
| Version | Description |
|---|---|
| 5.3.3 |
The iv parameter was added.
|
| 5.4.0 |
The raw_output was changed to options.
|
add a note
User Contributed Notes
openssl_decrypt - [2 notes]
nbari at dalmp dot com ¶
1 year ago
ittasks at gmail dot com ¶
29 days ago
in case that hosting do not provide openssl_encrypt decrypt functions - it could be mimiced via commad prompt executions
this functions will check is if openssl is installed and try to use it by default
function sslPrm()
{
return array("your_password","IV (optional)","aes-128-cbc");
}
function sslEnc($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);