I work in PHP and looking to convert a piece of code from JAVA/PHP to C# related to encryption , I am novice in C# can anyone help me?
Code is picked from http://www.androidsnippets.com/encrypt-decrypt-between-android-and-php
Also given below - Please help me :
====================================================
/****/
/PHP/
<?php
class MCrypt
{
private $iv = 'fedcba9876543210'; #Same as in JAVA
private $key = '0123456789abcdef'; #Same as in JAVA
function __construct()
{
}
function encrypt($str) {
//$key = $this->hex2bin($key);
$iv = $this->iv;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
mcrypt_generic_init($td, $this->key, $iv);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return bin2hex($encrypted);
}
function decrypt($code) {
//$key = $this->hex2bin($key);
$code = $this->hex2bin($code);
$iv = $this->iv;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
mcrypt_generic_init($td, $this->key, $iv);
$decrypted = mdecrypt_generic($td, $code);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return utf8_encode(trim($decrypted));
}
protected function hex2bin($hexdata) {
$bindata = '';
for ($i = 0; $i < strlen($hexdata); $i += 2) {
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}
}
Look at MSDN (MicroSoft Developer Network),
at the end of the page there are some examples called RijndaelManaged_Example that show how to encrypt and decypt
http://msdn.microsoft.com/en-us/library/f9df14hc(v=vs.110).aspx
Related
I used AES for encrypt the post parameters that send from java to server with volley. so I used below's class in my server for decrypt the post parammeters .
<?php
class MCrypt {
private $hex_iv = '31323334353637383930616263646566'; # converted Java byte code in to HEX and placed it here
private $key = '0FDOUZ.Qz'; #Same as in JAVA
function __construct() {
$this->key = hash('sha256', $this->key, true);
//echo $this->key.'<br/>';
}
function encrypt($str) {
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return base64_encode($encrypted);
}
function decrypt($code) {
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
$str = mdecrypt_generic($td, base64_decode($code));
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $this->strippadding($str);
}
/*
For PKCS7 padding
*/
private function addpadding($string, $blocksize = 16) {
$len = strlen($string);
$pad = $blocksize - ($len % $blocksize);
$string .= str_repeat(chr($pad), $pad);
return $string;
}
private function strippadding($string) {
$slast = ord(substr($string, -1));
$slastc = chr($slast);
$pcheck = substr($string, -$slast);
if (preg_match("/$slastc{" . $slast . "}/", $string)) {
$string = substr($string, 0, strlen($string) - $slast);
return $string;
} else {
return false;
}
}
function hexToStr($hex)
{
$string='';
for ($i=0; $i < strlen($hex)-1; $i+=2)
{
$string .= chr(hexdec($hex[$i].$hex[$i+1]));
}
return $string;
}
}
?>
Also I used below's code in newuser.php file .
<?php
.....
//decrypt
$encryption = new MCrypt();
$phone= $encryption->decrypt($phoneenc);
$password= $encryption->decrypt($passwordenc);
$serialdivice= $encryption->decrypt($serialdiviceenc);
$sequretyQustion= $encryption->decrypt($sequretyQustionenc);
$sequretyAnsewr= $encryption->decrypt($sequretyAnsewrenc);
.... ?>
Before Update php to php7.2 my code worked correctly . But for now It get error for decrypt method when I updated php . so How can i fix it?
I used openssl for both java and php .It's working correctly now.
I'm trying to decrypt data in PHP, I tried this code, but it doesn't print "almost" nor the decrypted data nor "finish". It only prints this line "4b3b798e708d81a939ca084d387136145".
Here is my code :
<?php
class MCrypt
{
private $iv = 'fedcba9876543210'; #Same as in JAVA
private $key = '0123456789abcdef'; #Same as in JAVA
function __construct()
{
}
/**
* #param string $str
* #param bool $isBinary whether to encrypt as binary or not. Default is: false
* #return string Encrypted data
*/
function encrypt($str, $isBinary = false)
{
echo "3";
$iv = $this->iv;
$str = $isBinary ? $str : utf8_decode($str);
$td = mcrypt_module_open('rijndael-128', ' ', 'cbc', $iv);
mcrypt_generic_init($td, $this->key, $iv);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $isBinary ? $encrypted : bin2hex($encrypted);
}
/**
* #param string $code
* #param bool $isBinary whether to decrypt as binary or not. Default is: false
* #return string Decrypted data
*/
function decrypt($code, $isBinary = false)
{
echo "4";
$code = $isBinary ? $code : $this->hex2bin($code);
$iv = $this->iv;
$td = mcrypt_module_open('rijndael-128', ' ', 'cbc', $iv);
mcrypt_generic_init($td, $this->key, $iv);
$decrypted = mdecrypt_generic($td, $code);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $isBinary ? trim($decrypted) : utf8_encode(trim($decrypted));
}
protected function hex2bin($hexdata)
{
echo "5";
$bindata = '';
for ($i = 0; $i < strlen($hexdata); $i += 2) {
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}
}
$encrypted="4b3b798e708d81a939ca084d387136";
echo $encrypted;
$mcrypt = new MCrypt();
echo "1";
$decrypted = $mcrypt->decrypt($encrypted);
echo "almost";
echo $decrypted;
echo "finish";
?>
class Auth extends MySQLi {
public function aes_enc($encrypt, $mc_key, $iv) {
$passcrypt = trim(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, substr($mc_key, 0, 32), trim($encrypt), MCRYPT_MODE_CBC, $iv));
return $passcrypt;
}
public function aes_dec($decrypt, $mc_key, $iv) {
$decrypted = trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, substr($mc_key, 0, 32), trim($decrypt), MCRYPT_MODE_CBC, $iv));
return $decrypted;
}
public function salt() {
return str_shuffle('abcdefghijklmnoprsquvzyx0123456789-.,;:_<>');
}
public function iv() {
return mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
}
}
And on test.php, following code:
<?
require('Auth.php');
$Auth = new Auth;
$str = "verygudlongpassword";
for ($i = 0; $i < 1000; $i++) {
$salt = sha1($Auth->salt());
$iv = $Auth->iv();
$enc = $Auth->aes_enc($str, $salt, $iv);
$dec = $Auth->aes_dec($enc, $salt, $iv);
if ($str != $dec) {
echo $salt . "<br>\n";
}
}
?>
Sometimes, $dec != $str. Why is this happening? I am not even saving anything into DB atm, so it's not that.
Thanks for help.
i dont really have anything more to say, but site isnt letting me post. (nvm that part)
After reviewing your code and playing with it locally. It would appear that your decryption leaves some whitespace on the decrypted text. I removed the trim() function from all locations except the return value from aes_dec() and the code now encrypts/decrypts your string successfully 1000 times.
So it would seem trimming was the problem and the solution.
class Auth extends MySQLi {
public function aes_enc($encrypt, $mc_key, $iv)
{
$passcrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, substr($mc_key, 0, 32), $encrypt, MCRYPT_MODE_CBC, $iv);
return $passcrypt;
}
public function aes_dec($decrypt, $mc_key, $iv)
{
$decrypted = trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, substr($mc_key, 0, 32), $decrypt, MCRYPT_MODE_CBC, $iv));
return $decrypted;
}
public function salt()
{
return str_shuffle('abcdefghijklmnoprsquvzyx0123456789-.,;:_<>');
}
public function iv()
{
return mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
}
}
$Auth = new Auth;
$str = "verygudlongpassword";
for ($i = 0; $i < 1000; $i++) {
$salt = sha1($Auth->salt());
$iv = $Auth->iv();
$enc = $Auth->aes_enc($str, $salt, $iv);
$dec = $Auth->aes_dec($enc, $salt, $iv);
if ($str != $dec) {
echo "Decryption failed!<br>\n";
} else {
echo "Decryption success! String: $dec<br>\n";
}
}
I'm looking for a simple yet cryptographically strong PHP implementation of AES using Mcrypt.
Hoping to boil it down to a simple pair of functions, $garble = encrypt($key, $payload) and $payload = decrypt($key, $garble).
I'm recently learning about this subject, and am posting this answer as a community wiki to share my knowledge, standing to be corrected.
Mcrypt Documentation
It's my understanding that AES can be achieved using Mcrypt with the following constants as options:
MCRYPT_RIJNDAEL_128 // as cipher
MCRYPT_MODE_CBC // as mode
MCRYPT_MODE_DEV_URANDOM // as random source (for IV)
During encryption, a randomized non-secret initialization vector (IV) should be used to randomize each encryption (so the same encryption never yields the same garble). This IV should be attached to the encryption result in order to be used later, during decryption.
Results should be Base 64 encoded for simple compatibility.
Implementation:
<?php
define('IV_SIZE', mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC));
function encrypt ($key, $payload) {
$iv = mcrypt_create_iv(IV_SIZE, MCRYPT_DEV_URANDOM);
$crypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $payload, MCRYPT_MODE_CBC, $iv);
$combo = $iv . $crypt;
$garble = base64_encode($iv . $crypt);
return $garble;
}
function decrypt ($key, $garble) {
$combo = base64_decode($garble);
$iv = substr($combo, 0, IV_SIZE);
$crypt = substr($combo, IV_SIZE, strlen($combo));
$payload = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $crypt, MCRYPT_MODE_CBC, $iv);
return $payload;
}
//:::::::::::: TESTING ::::::::::::
$key = "secret-key-is-secret";
$payload = "In 1435 the abbey came into conflict with the townspeople of Bamberg and was plundered.";
// ENCRYPTION
$garble = encrypt($key, $payload);
// DECRYPTION
$end_result = decrypt($key, $garble);
// Outputting Results
echo "Encrypted: ", var_dump($garble), "<br/><br/>";
echo "Decrypted: ", var_dump($end_result);
?>
Output looks like this:
Encrypted: string(152) "4dZcfPgS9DRldq+2pzvi7oAth/baXQOrMmt42la06ZkcmdQATG8mfO+t233MyUXSPYyjnmFMLwwHxpYiDmxvkKvRjLc0qPFfuIG1VrVon5EFxXEFqY6dZnApeE2sRKd2iv8m+DiiiykXBZ+LtRMUCw=="
Decrypted: string(96) "In 1435 the abbey came into conflict with the townspeople of Bamberg and was plundered."
Add function to clean control characters (�).
function clean($string) {
return preg_replace('/[\x00-\x09\x0B\x0C\x0E-\x1F\x7F]/', '', $string);
}
echo "Decrypted: ", clean($end_result);
Sentrapedagang.com
Simple and Usable:
$text= 'Hi, i am sentence';
$secret = 'RaNDoM cHars!##$%%^';
$encrypted = simple_encrypt($text, $secret);
$decrypted = simple_decrypt($encrypted_text, $secret);
codes:
function simple_encrypt($text_to_encrypt, $salt) {
return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, pack('H*', $salt), $text_to_encrypt, MCRYPT_MODE_CBC, $iv = mcrypt_create_iv($iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND))));
}
function simple_decrypt($encrypted, $salt) {
return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, pack('H*', $salt), base64_decode($encrypted), MCRYPT_MODE_CBC, $iv = mcrypt_create_iv($iv_size=mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND)));
}
Class Mycrypt
Try using this class. Here. All you need to pass is key and string.
class MCrypt
{
const iv = 'fedcba9876543210';
/**
* #param string $str
* #param bool $isBinary whether to encrypt as binary or not. Default is: false
* #return string Encrypted data
*/
public static function encrypt($str, $key="0123456789abcdef", $isBinary = false)
{
$iv = self::iv;
$str = $isBinary ? $str : utf8_decode($str);
$td = mcrypt_module_open('rijndael-128', ' ', 'cbc', $iv);
mcrypt_generic_init($td, $key, $iv);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $isBinary ? $encrypted : bin2hex($encrypted);
}
/**
* #param string $code
* #param bool $isBinary whether to decrypt as binary or not. Default is: false
* #return string Decrypted data
*/
public static function decrypt($code, $key="0123456789abcdef", $isBinary = false)
{
$code = $isBinary ? $code : self::hex2bin($code);
$iv = self::iv;
$td = mcrypt_module_open('rijndael-128', ' ', 'cbc', $iv);
mcrypt_generic_init($td, $key, $iv);
$decrypted = mdecrypt_generic($td, $code);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $isBinary ? trim($decrypted) : utf8_encode(trim($decrypted));
}
private static function hex2bin($hexdata)
{
$bindata = '';
for ($i = 0; $i < strlen($hexdata); $i += 2) {
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}
}
How To Use
$var = json_encode(['name'=>['Savatar', 'Flash']]);
$encrypted = MCrypt::encrypt();
$decrypted = MCrypt::decrypt($encrypted);
I am using MCrypt.php
index.php
include("MCrypt.php");
$crypter = new MCrypt();
MCrypt.php exists in same directory.
when I run index.php I get
Fatal error: Class 'MCrypt' not found in
/home/username/project/index.php on line 5
UPDATE: I have tried including just MCrypt.php but got the same error. I tried renaming to .class.php and got the same error.
class MCrypt {
private $iv = 'fedcba9876543210'; #Same as in JAVA
private $key = '0123456789abcdef'; #Same as in JAVA
function __construct() {
}
function encrypt($str) {
$iv = $this->iv;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
mcrypt_generic_init($td, $this->key, $iv);
$str = $this->padString($str);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return base64_encode($encrypted);
}
function decrypt($code) {
$code = base64_decode($code);
$iv = $this->iv;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
mcrypt_generic_init($td, $this->key, $iv);
$decrypted = mdecrypt_generic($td, $code);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return utf8_encode(trim($decrypted));
}
protected function hex2bin($hexdata) {
$bindata = '';
for ($i = 0; $i < strlen($hexdata); $i += 2) {
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}
private function padString($source) {
$paddingChar = ' ';
$size = 16;
$x = strlen($source) % $size;
$padLength = $size - $x;
for ($i = 0; $i < $padLength; $i++) {
$source .= $paddingChar;
}
return $source;
}
}
your php file has to start with the php opening tag. the first line, before the class, has to be <?php
like this:
<?php
class MCrypt {
...
Including instead of MCrypt.class.php, the file is MCrypt.php if the file is called MCrypt.php.