Encrypt Querystring

  • Thread starter Thread starter Islamegy®
  • Start date Start date
I

Islamegy®

I give up.. I tried everything to encrypt querystring and decrypt it back
but this never success.. i use RSA encryption. I always get excption when
Convert fromBase64String so i tried HttpUtitlity.UrlEncode() but i got bad
data Exception..

Is there anyway to work around this??
 
To work around what? You got to show some code if you want help with it.
 
Here is the code i use for encrypt/decrypt

using System;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Configuration;
public class DataProtection
{
public static RSACryptoServiceProvider rsa;
public static void AssignParameter()
{
const int PROVIDER_RSA_FULL = 1;
const string CONTAINER_NAME = "NMTechnology";
CspParameters cspParams;
cspParams = new CspParameters(PROVIDER_RSA_FULL);
cspParams.KeyContainerName = CONTAINER_NAME;
cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider";
try
{
rsa = new RSACryptoServiceProvider(cspParams);
}
catch
{
string x = "X";
}
}
public static string Encrypt(string data2Encrypt)
{
AssignParameter();
StreamReader reader = new
StreamReader(ConfigurationManager.AppSettings["PublicKey"].ToString());
string publicOnlyKeyXML = reader.ReadToEnd();
rsa.FromXmlString(publicOnlyKeyXML);
reader.Close();
//read plaintext, encrypt it to ciphertext
byte[] plainbytes = System.Text.Encoding.UTF8.GetBytes(data2Encrypt);
byte[] cipherbytes = rsa.Encrypt(plainbytes, false);
return Convert.ToBase64String(cipherbytes);
}
public static void AssignNewKey()
{
AssignParameter();
//provide public and private RSA params
StreamWriter writer = new
StreamWriter(ConfigurationManager.AppSettings["PrivateKey"].ToString());
string publicPrivateKeyXML = rsa.ToXmlString(true);
writer.Write(publicPrivateKeyXML);
writer.Close();
//provide public only RSA params
writer = new
StreamWriter(ConfigurationManager.AppSettings["PublicKey"].ToString());
string publicOnlyKeyXML = rsa.ToXmlString(false);
writer.Write(publicOnlyKeyXML);
writer.Close();
}
public static string Decrypt(string data2Decrypt)
{
AssignParameter();
byte[] getpassword = Convert.FromBase64String(data2Decrypt);
StreamReader reader = new
StreamReader(ConfigurationManager.AppSettings["PrivateKey"].ToString());
string publicPrivateKeyXML = reader.ReadToEnd();
rsa.FromXmlString(publicPrivateKeyXML);
reader.Close();
//read ciphertext, decrypt it to plaintext
byte[] plain = rsa.Decrypt(getpassword, false);
return System.Text.Encoding.UTF8.GetString(plain);
}
}
 
I have a pretty simple sample of this:

http://blog.binaryocean.com/NETSymmetricEncryption.aspx

--

Andrew Robinson

Islamegy® said:
Here is the code i use for encrypt/decrypt

using System;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Configuration;
public class DataProtection
{
public static RSACryptoServiceProvider rsa;
public static void AssignParameter()
{
const int PROVIDER_RSA_FULL = 1;
const string CONTAINER_NAME = "NMTechnology";
CspParameters cspParams;
cspParams = new CspParameters(PROVIDER_RSA_FULL);
cspParams.KeyContainerName = CONTAINER_NAME;
cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider";
try
{
rsa = new RSACryptoServiceProvider(cspParams);
}
catch
{
string x = "X";
}
}
public static string Encrypt(string data2Encrypt)
{
AssignParameter();
StreamReader reader = new
StreamReader(ConfigurationManager.AppSettings["PublicKey"].ToString());
string publicOnlyKeyXML = reader.ReadToEnd();
rsa.FromXmlString(publicOnlyKeyXML);
reader.Close();
//read plaintext, encrypt it to ciphertext
byte[] plainbytes = System.Text.Encoding.UTF8.GetBytes(data2Encrypt);
byte[] cipherbytes = rsa.Encrypt(plainbytes, false);
return Convert.ToBase64String(cipherbytes);
}
public static void AssignNewKey()
{
AssignParameter();
//provide public and private RSA params
StreamWriter writer = new
StreamWriter(ConfigurationManager.AppSettings["PrivateKey"].ToString());
string publicPrivateKeyXML = rsa.ToXmlString(true);
writer.Write(publicPrivateKeyXML);
writer.Close();
//provide public only RSA params
writer = new
StreamWriter(ConfigurationManager.AppSettings["PublicKey"].ToString());
string publicOnlyKeyXML = rsa.ToXmlString(false);
writer.Write(publicOnlyKeyXML);
writer.Close();
}
public static string Decrypt(string data2Decrypt)
{
AssignParameter();
byte[] getpassword = Convert.FromBase64String(data2Decrypt);
StreamReader reader = new
StreamReader(ConfigurationManager.AppSettings["PrivateKey"].ToString());
string publicPrivateKeyXML = reader.ReadToEnd();
rsa.FromXmlString(publicPrivateKeyXML);
reader.Close();
//read ciphertext, decrypt it to plaintext
byte[] plain = rsa.Decrypt(getpassword, false);
return System.Text.Encoding.UTF8.GetString(plain);
}
}



Göran Andersson said:
To work around what? You got to show some code if you want help with it.
Click to expand...
Click to expand...
 
That looks plain and simple. How do you use the code?

Islamegy® said:
Here is the code i use for encrypt/decrypt

using System;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Configuration;
public class DataProtection
{
public static RSACryptoServiceProvider rsa;
public static void AssignParameter()
{
const int PROVIDER_RSA_FULL = 1;
const string CONTAINER_NAME = "NMTechnology";
CspParameters cspParams;
cspParams = new CspParameters(PROVIDER_RSA_FULL);
cspParams.KeyContainerName = CONTAINER_NAME;
cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider";
try
{
rsa = new RSACryptoServiceProvider(cspParams);
}
catch
{
string x = "X";
}
}
public static string Encrypt(string data2Encrypt)
{
AssignParameter();
StreamReader reader = new
StreamReader(ConfigurationManager.AppSettings["PublicKey"].ToString());
string publicOnlyKeyXML = reader.ReadToEnd();
rsa.FromXmlString(publicOnlyKeyXML);
reader.Close();
//read plaintext, encrypt it to ciphertext
byte[] plainbytes = System.Text.Encoding.UTF8.GetBytes(data2Encrypt);
byte[] cipherbytes = rsa.Encrypt(plainbytes, false);
return Convert.ToBase64String(cipherbytes);
}
public static void AssignNewKey()
{
AssignParameter();
//provide public and private RSA params
StreamWriter writer = new
StreamWriter(ConfigurationManager.AppSettings["PrivateKey"].ToString());
string publicPrivateKeyXML = rsa.ToXmlString(true);
writer.Write(publicPrivateKeyXML);
writer.Close();
//provide public only RSA params
writer = new
StreamWriter(ConfigurationManager.AppSettings["PublicKey"].ToString());
string publicOnlyKeyXML = rsa.ToXmlString(false);
writer.Write(publicOnlyKeyXML);
writer.Close();
}
public static string Decrypt(string data2Decrypt)
{
AssignParameter();
byte[] getpassword = Convert.FromBase64String(data2Decrypt);
StreamReader reader = new
StreamReader(ConfigurationManager.AppSettings["PrivateKey"].ToString());
string publicPrivateKeyXML = reader.ReadToEnd();
rsa.FromXmlString(publicPrivateKeyXML);
reader.Close();
//read ciphertext, decrypt it to plaintext
byte[] plain = rsa.Decrypt(getpassword, false);
return System.Text.Encoding.UTF8.GetString(plain);
}
}



Göran Andersson said:
To work around what? You got to show some code if you want help with it.
Click to expand...
Click to expand...
 
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