加密、解密帮助类

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/// <summary>
/// DESEncrypt
/// 描 述：加密、解密帮助类
/// </summary>
public class DESEncrypt
{
    private static string key = "learun###***";

    #region ========加密========
    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="Text">需要加密的内容</param>
    /// <returns></returns>
    public static string Encrypt(string Text)
    {
        return Encrypt(Text, key);
    }
    /// <summary> 
    /// 加密数据 
    /// </summary> 
    /// <param name="Text">需要加密的内容</param> 
    /// <param name="sKey">秘钥</param> 
    /// <returns></returns> 
    public static string Encrypt(string Text, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        byte[] inputByteArray;
        inputByteArray = Encoding.Default.GetBytes(Text);
        des.Key = ASCIIEncoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
        des.IV = ASCIIEncoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();
        StringBuilder ret = new StringBuilder();
        foreach (byte b in ms.ToArray())
        {
            ret.AppendFormat("{0:X2}", b);
        }
        return ret.ToString();
    }

    #endregion

    #region ========解密========
    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="Text">需要解密的内容</param>
    /// <returns></returns>
    public static string Decrypt(string Text)
    {
        if (!string.IsNullOrEmpty(Text))
        {
            return Decrypt(Text, key);
        }
        else
        {
            return "";
        }
    }
    /// <summary> 
    /// 解密数据 
    /// </summary> 
    /// <param name="Text">需要解密的内容</param> 
    /// <param name="sKey">秘钥</param> 
    /// <returns></returns> 
    public static string Decrypt(string Text, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        int len;
        len = Text.Length / 2;
        byte[] inputByteArray = new byte[len];
        int x, i;
        for (x = 0; x < len; x++)
        {
            i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
            inputByteArray[x] = (byte)i;
        }
        des.Key = ASCIIEncoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
        des.IV = ASCIIEncoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();
        return Encoding.Default.GetString(ms.ToArray());
    }

    #endregion
}

数据访问(SqlServer) 上下文

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/// <summary>
/// Md5Helper
/// 描 述：数据访问(SqlServer) 上下文
/// </summary>
public class Md5Helper
{
    #region "MD5加密"
    /// <summary>
    /// MD5加密
    /// </summary>
    /// <param name="str">加密字符</param>
    /// <param name="code">加密位数16/32</param>
    /// <returns></returns>
    public static string Encrypt(string str, int code)
    {
        string strEncrypt = string.Empty;
        if (code == 16)
        {
            strEncrypt = Hash(str).Substring(8, 16);
        }

        if (code == 32)
        {
            strEncrypt = Hash(str);
        }
        return strEncrypt;
    }
    /// <summary>
    /// 32位MD5加密（小写）
    /// </summary>
    /// <param name="input">输入字段</param>
    /// <returns></returns>
    public static string Hash(string input)
    {
        MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
        byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
        StringBuilder sBuilder = new StringBuilder();
        for (int i = 0; i < data.Length; i++)
        {
            sBuilder.Append(data[i].ToString("x2"));
        }
        return sBuilder.ToString();
    }
    #endregion
}