Encrypt and Decrypt in asp .net

Question

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ASP.NET

Can someone give me the code to Encrypt and Decrypt a string in asp .net

Posted 18-Nov-13 18:10pm

Khan Sameer

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Comments

Sergey Alexandrovich Kryukov 19-Nov-13 0:28am

Not a question ("can someone" does not count :-). The meaning of encrypt and decrypt can be very different. You need to explain what do you want to achieve.
—SA

3 solutions

Solution 2

Look at this articles on cryptography.

Cryptography in C#[^]
http://msdn.microsoft.com/en-us/magazine/cc164055.aspx[^]

Posted 18-Nov-13 18:28pm

ArunRajendra

Solution 3

Encryption Code
(Note if you are using Hasing the key must be 128 bit)

C#

public static string Encrypt(string ToEncrypt, bool useHasing)
        {
            byte[] keyArray;
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(ToEncrypt);
            
            string Key = "asdfewrewqrss323"; //Must be a 123 bit key
            if (useHasing)
            {
                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(Key));
                hashmd5.Clear();
            }
            else
            {
                keyArray = UTF8Encoding.UTF8.GetBytes(Key);
            }
            TripleDESCryptoServiceProvider tDes = new TripleDESCryptoServiceProvider();
            tDes.Key = keyArray;
            tDes.Mode = CipherMode.ECB;
            tDes.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = tDes.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            tDes.Clear();
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

Decryption Code

C#

public static string Decrypt(string cypherString, bool useHasing)
        {
            byte[] keyArray;
            byte[] toDecryptArray = Convert.FromBase64String(cypherString);
             string Key = "asdfewrewqrss323"; //Must be a 123 bit key
            if (useHasing)
            {
                MD5CryptoServiceProvider hashmd = new MD5CryptoServiceProvider();
                keyArray = hashmd.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                hashmd.Clear();
            }
            else
            {
                keyArray = UTF8Encoding.UTF8.GetBytes(key);
            }
            TripleDESCryptoServiceProvider tDes = new TripleDESCryptoServiceProvider();
            tDes.Key = keyArray;
            tDes.Mode = CipherMode.ECB;
            tDes.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = tDes.CreateDecryptor();
            try
            {
                byte[] resultArray = cTransform.TransformFinalBlock(toDecryptArray, 0, toDecryptArray.Length);

                tDes.Clear();
                return UTF8Encoding.UTF8.GetString(resultArray, 0, resultArray.Length);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

Usage

C#

textBox2.Text = Encrypt(textBox1.Text, false);

Posted 18-Nov-13 18:51pm

ciyrus

Updated 18-Nov-13 18:52pm

v2

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♥…ЯҠ…♥ · Accepted Answer · 2013-11-18T18:27:00

Hi Sameer,

I would suggest you to try your own encryption technology since C# has more number of encryption methodology.

C#

private string encodeStr =
            @"!#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~";

        private string decodeStr =
            @"@ABCDEFGHIJKLMNO0123456789:;<=>?pqrstuvwxyz{|}~!#$%&'()*+,-./`abcdefghijklmnoPQRSTUVWXYZ[\]^_";


protected string encodeString(string rawText)
        {
            string cipherText = string.Empty;
            foreach (char rawChar in rawText)
            {
                cipherText += encodeStr.ElementAt(decodeStr.IndexOf(rawChar));
            }
            return cipherText;
        }

        //Custom Decryption method
        protected string decodeString(string cipherText)
        {
            string rawText = string.Empty;
            foreach (char cipherChar in cipherText)
            {
                rawText += decodeStr.ElementAt(encodeStr.IndexOf(cipherChar));
            }
            return rawText;
}

Function call:
encodeString("input String to encrypt");
decodeString("input String to decrypt");

Ok if you not ready to try your own encryption methods, have a look at here[^]andEncryption/Decryption with .NET[^]