Encryption and Decryption Code Bits

I recently had to do some simple encryption and decryption for password storage. I wanted to document this so a blog entry seemed in order. So without any yammering here’s the simple class I created.

public static class EncryptionHelper
    {
        private const string CryptographyKey = "CryptKey";

        // The Initialization Vector for the DES encryption routine
        private static readonly byte[] iv =
            new byte[] { 220, 13, 41, 29, 1, 63, 73, 9 };

        /// <summary>
        /// Encrypts provided string parameter
        /// </summary>
        public static string Encrypt(string s)
        {
            if (string.IsNullOrEmpty(s)) return string.Empty;

            byte[] buffer = Encoding.ASCII.GetBytes(s);
            var des = new TripleDESCryptoServiceProvider();
            var md5 = new MD5CryptoServiceProvider();

            des.Key = md5.ComputeHash(Encoding.ASCII.GetBytes(CryptographyKey));
            des.IV = iv;

            string result = Convert.ToBase64String(
                des.CreateEncryptor().TransformFinalBlock(
                    buffer, 0, buffer.Length));

            return result;
        }

        /// <summary>
        /// Decrypts provided string parameter
        /// </summary>
        public static string Decrypt(string s)
        {
            if (string.IsNullOrEmpty(s)) return string.Empty;

            byte[] buffer = Convert.FromBase64String(s);
            var des = new TripleDESCryptoServiceProvider();
            var md5 = new MD5CryptoServiceProvider();

            des.Key = md5.ComputeHash(Encoding.ASCII.GetBytes(CryptographyKey));
            des.IV = iv;

            string result = Encoding.ASCII.GetString(
                des.CreateDecryptor().TransformFinalBlock(
                    buffer, 0, buffer.Length));

            return result;
        }
    }

.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, “Courier New”, courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }

So simple enough. Hope that is helpful to anyone interested in a super easy encrypt & decrypt example. : )

Published by Adron