I am trying to send some encrypted data from a php application to be
decoded in a .Net application. Both apps encode/decode a given string
but generate different encrypted results. Anyone have any idea? Code
to follow:
php====>
<?php
// Designate string to be encrypted
$string = "This is a test";
// Encryption/decryption key
$key = pack('H*',md5("mysecretkey"));
echo "PHP:KeySize:";
echo mcrypt_get_key_size('tripledes', 'ecb')*8;
echo "<BR>";
echo "PHP:BlockSize:";
echo mcrypt_get_block_size('tripledes', 'ecb')*8;
echo "<BR>";
// Encryption Algorithm
$cipher_alg = MCRYPT_TRIPLEDES;
#$cipher_alg = ;
#$cipher_alg = ;
// Create the initialization vector for added security.
//$iv = mcrypt_create_iv(mcrypt_get_iv_size($cipher_alg,
MCRYPT_MODE_ECB), MCRYPT_RAND);
$iv = pack("H*","ec787813562c5be0");
// Output original string
echo "PHP:Original string:$string <br>";
echo "PHP:Original Key:". base64_encode($key)."<br>";
echo "PHP:Encryption Method: tripledes <br>";
echo "PHP:IV:".base64_encode($iv)."<br>";
// Encrypt $string
//$encrypted_string = mcrypt_encrypt($cipher_alg, $key, $string,
MCRYPT_MODE_CBC, $iv);
$encrypted_string = mcrypt_encrypt($cipher_alg, $key, $string,
MCRYPT_MODE_CFB, $iv);
$decrypted_string = mcrypt_decrypt($cipher_alg, $key,
$encrypted_string, MCRYPT_MODE_CFB, $iv);
echo "PHP:Encrypted string
Base64:".base64_encode($encrypted_string)."<br>";
echo "PHP:Decrypted string:$decrypted_string";
?>
<===================
PHP OUTPUTPHP:
KeySize:192
PHP:BlockSize:64
PHP:Original string:This is a test
PHP:Original Key:NNLkJVyOa+s8QvJN/X5tqQ==
PHP:Encryption Method: tripledes
PHP:IV:7Hh4E1YsW+A=
PHP:Encrypted string Base64:A+9SKuoLdZaATqa+qmTipg==
PHP:Decrypted string:This is a test
===========================>
C# (.NET)
using System;
using System.Security.Cryptography;
using System.Text;
namespace test
{
class TryDes{
public string EncryptTripleDES(string Plaintext,
string key) {
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new
MD5CryptoServiceProvider();
DES.Key =
hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key));
DES.Mode = CipherMode.CFB;
DES.IV =
Convert.FromBase64String("7Hh4E1YsW+A=");
DES.Padding=PaddingMode.Zeros;
Console.WriteLine("");
Console.WriteLine("NET:KeySize:"+DES.KeySize);
Console.WriteLine("NET:BlockSize:"+DES.BlockSize);
Console.WriteLine("NET:Original
String:"+Plaintext);
Console.WriteLine("NET:Original
Key:"+Convert.ToBase64String(DES.Key));
Console.WriteLine("NET:Encryption
Method:TripeDES");
//DES.Mode = CipherMode.ECB;
Console.WriteLine(
"NET:IV:"+Convert.ToBase64String(DES.IV));
ICryptoTransform DESEncrypt =
DES.CreateEncryptor(DES.Key,DES.IV);
byte[] Buffer =
ASCIIEncoding.ASCII.GetBytes(Plaintext);
return
Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0,
Buffer.Length));
}
public string DecryptTripleDES(string base64Text,
string key){
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new
MD5CryptoServiceProvider();
DES.Key =
hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key));
DES.Mode = CipherMode.CFB;
DES.Padding=PaddingMode.Zeros;
DES.IV = Convert.FromBase64String("7Hh4E1YsW+A=");
ICryptoTransform DESDecrypt =
DES.CreateDecryptor(DES.Key,DES.IV);
byte[] Buffer =
Convert.FromBase64String(base64Text);
return
ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer,
0, Buffer.Length));
}
}
class Class1
{
static void Main(string[] args) {
TryDes md = new TryDes();
string secrekey = "mysecretkey";
string sometest = md.EncryptTripleDES("This is
a test",secrekey);
Console.WriteLine("NET:Encrypted string
Base64:"+sometest);
Console.WriteLine("NET:Decrypted
string:"+md.DecryptTripleDES(sometest,secrekey));
Console.WriteLine("");
}
}
}
<======================
.Net Output
NET:KeySize:192
NET:BlockSize:64
NET:Original String:This is a test
NET:Original Key:NNLkJVyOa+s8QvJN/X5tqQ==
NET:Encryption Method:TripeDES
NET:IV:7Hh4E1YsW+A=
NET:Encrypted string Base64:qbGgiTZp9YTGOutg8IGlqw==
NET:Decrypted string:This is a test
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