I have a string encrypted in PHP that I would like to decrypt in C#. I used the tutorial below to do the encryption, but am having problems decrypting. Can anyone post an example on how to do this?
http://www.sanity-free.org/131/triple_des_between_php_and_csharp.html
Hope this helps:
class Program
{
static void Main(string[] args)
{
Console.WriteLine(Decrypt("47794945c0230c3d"));
}
static string Decrypt(string input)
{
TripleDES tripleDes = TripleDES.Create();
tripleDes.IV = Encoding.ASCII.GetBytes("password");
tripleDes.Key = Encoding.ASCII.GetBytes("passwordDR0wSS@P6660juht");
tripleDes.Mode = CipherMode.CBC;
tripleDes.Padding = PaddingMode.Zeros;
ICryptoTransform crypto = tripleDes.CreateDecryptor();
byte[] decodedInput = Decoder(input);
byte[] decryptedBytes = crypto.TransformFinalBlock(decodedInput, 0, decodedInput.Length);
return Encoding.ASCII.GetString(decryptedBytes);
}
static byte[] Decoder(string input)
{
byte[] bytes = new byte[input.Length/2];
int targetPosition = 0;
for( int sourcePosition=0; sourcePosition<input.Length; sourcePosition+=2 )
{
string hexCode = input.Substring(sourcePosition, 2);
bytes[targetPosition++] = Byte.Parse(hexCode, NumberStyles.AllowHexSpecifier);
}
return bytes;
}
}
If you are not tied to tripleDES, but just need to pass encrypted data between php and .net, this will work for you. It's in VB and C# below.
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
// I blantantly stole, tweaked and happily used this code from:
// Lord of Ports http://www.experts-exchange.com/M_1736399.html
$ky = 'lkirwf897+22#bbtrm8814z5qq=498j5'; // 32 * 8 = 256 bit key
$iv = '741952hheeyy66#cs!9hjv887mxx7@8y'; // 32 * 8 = 256 bit iv
$text = "Here is my data to encrypt!!!";
$from_vb = "QBlgcQ2+v3wd8RLjhtu07ZBd8aQWjPMfTc/73TPzlyA="; // enter value from vb.net app here to test
$etext = encryptRJ256($ky, $iv, $text);
$dtext = decryptRJ256($ky, $iv, $etext);
$vtext = decryptRJ256($ky, $iv, $from_vb);
echo "<HR>orignal string: $text";
echo "<HR>encrypted in php: $etext";
echo "<HR>decrypted in php: $dtext";
echo "<HR>encrypted in vb: $from_vb";
echo "<HR>from vb decrypted in php: $vtext";
echo "<HR>If you like it say thanks! richard dot varno at gmail dot com";
exit;
function decryptRJ256($key,$iv,$string_to_decrypt)
{
$string_to_decrypt = base64_decode($string_to_decrypt);
$rtn = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $string_to_decrypt, MCRYPT_MODE_CBC, $iv);
$rtn = rtrim($rtn, "\0\4");
return($rtn);
}
function encryptRJ256($key,$iv,$string_to_encrypt)
{
$rtn = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $string_to_encrypt, MCRYPT_MODE_CBC, $iv);
$rtn = base64_encode($rtn);
return($rtn);
}
?>
Imports System
Imports System.Text
Imports System.Security.Cryptography
Imports System.IO
Module Module1
' I blantantly stole, tweaked and happily used this code from:
' Lord of Ports http://www.experts-exchange.com/M_1736399.html
Sub Main()
'Shared 256 bit Key and IV here
Dim sKy As String = "lkirwf897+22#bbtrm8814z5qq=498j5" '32 chr shared ascii string (32 * 8 = 256 bit)
Dim sIV As String = "741952hheeyy66#cs!9hjv887mxx7@8y" '32 chr shared ascii string (32 * 8 = 256 bit)
Dim sTextVal As String = "Here is my data to encrypt!!!"
Dim eText As String
Dim dText As String
eText = EncryptRJ256(sKy, sIV, sTextVal)
dText = DecryptRJ256(sKy, sIV, eText)
Console.WriteLine("key: " & sKy)
Console.WriteLine()
Console.WriteLine(" iv: " & sIV)
Console.WriteLine("txt: " & sTextVal)
Console.WriteLine("encrypted: " & eText)
Console.WriteLine("decrypted: " & dText)
Console.WriteLine("If you like it say thanks! richard dot varno at gmail dot com")
Console.WriteLine("press any key to exit")
Console.ReadKey(True)
End Sub
Public Function DecryptRJ256(ByVal prm_key As String, ByVal prm_iv As String, ByVal prm_text_to_decrypt As String)
Dim sEncryptedString As String = prm_text_to_decrypt
Dim myRijndael As New RijndaelManaged
myRijndael.Padding = PaddingMode.Zeros
myRijndael.Mode = CipherMode.CBC
myRijndael.KeySize = 256
myRijndael.BlockSize = 256
Dim key() As Byte
Dim IV() As Byte
key = System.Text.Encoding.ASCII.GetBytes(prm_key)
IV = System.Text.Encoding.ASCII.GetBytes(prm_iv)
Dim decryptor As ICryptoTransform = myRijndael.CreateDecryptor(key, IV)
Dim sEncrypted As Byte() = Convert.FromBase64String(sEncryptedString)
Dim fromEncrypt() As Byte = New Byte(sEncrypted.Length) {}
Dim msDecrypt As New MemoryStream(sEncrypted)
Dim csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)
Return (System.Text.Encoding.ASCII.GetString(fromEncrypt))
End Function
Public Function EncryptRJ256(ByVal prm_key As String, ByVal prm_iv As String, ByVal prm_text_to_encrypt As String)
Dim sToEncrypt As String = prm_text_to_encrypt
Dim myRijndael As New RijndaelManaged
myRijndael.Padding = PaddingMode.Zeros
myRijndael.Mode = CipherMode.CBC
myRijndael.KeySize = 256
myRijndael.BlockSize = 256
Dim encrypted() As Byte
Dim toEncrypt() As Byte
Dim key() As Byte
Dim IV() As Byte
key = System.Text.Encoding.ASCII.GetBytes(prm_key)
IV = System.Text.Encoding.ASCII.GetBytes(prm_iv)
Dim encryptor As ICryptoTransform = myRijndael.CreateEncryptor(key, IV)
Dim msEncrypt As New MemoryStream()
Dim csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
toEncrypt = System.Text.Encoding.ASCII.GetBytes(sToEncrypt)
csEncrypt.Write(toEncrypt, 0, toEncrypt.Length)
csEncrypt.FlushFinalBlock()
encrypted = msEncrypt.ToArray()
Return (Convert.ToBase64String(encrypted))
End Function
End Module
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
class Program {
static void Main(string[] args) {
//Shared 256 bit Key and IV here
const string sKy = "lkirwf897+22#bbtrm8814z5qq=498j5"; //32 chr shared ascii string (32 * 8 = 256 bit)
const string sIV = "741952hheeyy66#cs!9hjv887mxx7@8y"; //32 chr shared ascii string (32 * 8 = 256 bit)
var sTextVal = "Here is my data to encrypt!!!";
var eText = EncryptRJ256(sKy, sIV, sTextVal);
var dText = DecryptRJ256(sKy, sIV, eText);
Console.WriteLine("key: " + sKy);
Console.WriteLine();
Console.WriteLine(" iv: " + sIV);
Console.WriteLine("txt: " + sTextVal);
Console.WriteLine("encrypted: " + eText);
Console.WriteLine("decrypted: " + dText);
Console.WriteLine("press any key to exit");
Console.ReadKey(true);
}
public static string DecryptRJ256(string prm_key, string prm_iv, string prm_text_to_decrypt) {
var sEncryptedString = prm_text_to_decrypt;
var myRijndael = new RijndaelManaged() {
Padding = PaddingMode.Zeros,
Mode = CipherMode.CBC,
KeySize = 256,
BlockSize = 256
};
var key = Encoding.ASCII.GetBytes(prm_key);
var IV = Encoding.ASCII.GetBytes(prm_iv);
var decryptor = myRijndael.CreateDecryptor(key, IV);
var sEncrypted = Convert.FromBase64String(sEncryptedString);
var fromEncrypt = new byte[sEncrypted.Length];
var msDecrypt = new MemoryStream(sEncrypted);
var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
return (Encoding.ASCII.GetString(fromEncrypt));
}
public static string EncryptRJ256(string prm_key, string prm_iv, string prm_text_to_encrypt) {
var sToEncrypt = prm_text_to_encrypt;
var myRijndael = new RijndaelManaged() {
Padding = PaddingMode.Zeros,
Mode = CipherMode.CBC,
KeySize = 256,
BlockSize = 256
};
var key = Encoding.ASCII.GetBytes(prm_key);
var IV = Encoding.ASCII.GetBytes(prm_iv);
var encryptor = myRijndael.CreateEncryptor(key, IV);
var msEncrypt = new MemoryStream();
var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
var toEncrypt = Encoding.ASCII.GetBytes(sToEncrypt);
csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
csEncrypt.FlushFinalBlock();
var encrypted = msEncrypt.ToArray();
return (Convert.ToBase64String(encrypted));
}
}
