encrypt QS

[Techno]

Hi there. i have googled for this but unfortunatly didnt come with "working" solutions

i was wondering, how is it possible to encrypt and decrypt query strings in asp.net? is it possible?

[Patch21]

You can encrypt and decrypt strings using the System.Security.Cryptography class in .Net. Take a look here:

http://www.codeproject.com/dotnet/crypto_net.asp

A little complicating at first but you eventually get the hang of it :/

[Techno]

dnt like those codes

[Patch21]

hehe, well thats the proper way to encrypt data if you want to be safe (well as far as I know)

The code is all there, just copy paste, stick it into some functions and pass it your string. Simple

[Techno]

surprise surprise - code doesnt work well

doesnt like this line:

SymmetricAlgorithm Like DES mCryptProv = SymmetricAlgorithm.Create("Rijndael")

doesnt like the first code: "SymmetricAlgorithm is a type and cannot be used in an expression"

[Patch21]

Thats cos it looks like they messed up the comments

SymmetricAlgorithm Like DES -->> should be part of the comments on the line above

I'm guessing the line should rather say:

mCryptProv = SymmetricAlgorithm.Create("Rijndael")

[Magiaus]

    public class Crypto
    {
        #region Crypto
        internal static string cryptKey = "SiTdOwNaNdShUtUpYoUbIgBaLlEd****";  
        internal static string cryptIV = "iHaTe****InGdOgS";
        internal static System.Security.Cryptography.RijndaelManaged rj;
        internal static string Encrypt(string value)
        {
            byte[] b = System.Text.ASCIIEncoding.ASCII.GetBytes(value);
            byte[] key = System.Text.ASCIIEncoding.ASCII.GetBytes(cryptKey);
            byte[] iv = System.Text.ASCIIEncoding.ASCII.GetBytes(cryptIV);
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            rj = new System.Security.Cryptography.RijndaelManaged();
            rj.Key = key;
            rj.IV = iv;

            System.Security.Cryptography.ICryptoTransform encrypt = rj.CreateEncryptor();
            System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(ms, encrypt, System.Security.Cryptography.CryptoStreamMode.Write);

            cs.Write(b, 0, b.Length);
            cs.FlushFinalBlock();

            byte[] bo = ms.GetBuffer();
            int i = 0;
            for(i = 0; i < bo.Length; i++)
            {
                if(bo[i] == 0) break;
            }
            return System.Convert.ToBase64String(bo, 0, i);
        }
        internal static string Decrypt(string value)
        {
            byte[] b = System.Convert.FromBase64String(value);
            byte[] key = System.Text.ASCIIEncoding.ASCII.GetBytes(cryptKey);
            byte[] iv = System.Text.ASCIIEncoding.ASCII.GetBytes(cryptIV);
            System.IO.MemoryStream ms = new System.IO.MemoryStream(b, 0, b.Length);
            rj = new System.Security.Cryptography.RijndaelManaged();
            rj.Key = key;
            rj.IV = iv;

            System.Security.Cryptography.ICryptoTransform encrypt = rj.CreateDecryptor();
            System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(ms, encrypt, System.Security.Cryptography.CryptoStreamMode.Read);

            System.IO.StreamReader sr = new System.IO.StreamReader(cs);
            return sr.ReadToEnd();
        }
        #endregion
    } 

This works, but the encryption has a flaw it has returned items that can't be decrypted.