C# DES加密解密

前台layui布局：

<div class="layui-form-item">
    <div class="layui-inline">
        <label class="layui-form-label">未加密密码</label>
        <div class="layui-input-block">
            <input type="text" name="UnEncryptPwd" autocomplete="off" placeholder="请输入密码" class="layui-input" />
        </div>
    </div>

    <div class="layui-inline">
        <button type="button" id="EncryptPwd" class="layui-form-label layui-btn layui-btn-primary">加密</button>
        <div class="layui-input-block">
            <input type="text" name="DecryptPwd" placeholder="" autocomplete="off" class="layui-input" />
        </div>
    </div>
</div>
<div class="layui-form-item">
    <div class="layui-inline">
        <label class="layui-form-label">已加密密码</label>
        <div class="layui-input-block">
            <input type="text" name="EncryptPwd" autocomplete="off" placeholder="请输入密码" class="layui-input" />
        </div>
    </div>

    <div class="layui-inline">
        <button type="button" id="DecryptPwd" class="layui-form-label layui-btn layui-btn-primary">解密</button>
        <div class="layui-input-block">
            <input type="text" name="txtDecryptPwd" placeholder="" autocomplete="off" class="layui-input" />
        </div>
    </div>
</div>

ajax发起请求：

<script type="text/javascript">
    $(function () {
        //加密
        $("#EncryptPwd").click(function () {
            var $unEncryptPwd = $("input[name=UnEncryptPwd]");//密码输入框

            $.post("/Ashx/Login.ashx", {
                action: "EncryptPwd",
                unEncryptPwd: $unEncryptPwd.val()//未加密密码
            }, function (data) {
                data = JSON.parse(data);
                $("input[name=DecryptPwd]").val(data.msg);
            });
        });
        //解密
        $("#DecryptPwd").click(function () {
            var $EncryptPwd = $("input[name=EncryptPwd]");//密码输入框

            $.post("/Ashx/Login.ashx", {
                action: "DecryptPwd",
                EncryptPwd: $EncryptPwd.val()//未加密密码
            }, function (data) {
                data = JSON.parse(data);
                $("input[name=txtDecryptPwd]").val(data.msg);
            });
        });
    });
</script>

一般处理程序接受action并通过反射调用对应公共方法

public void ProcessRequest(HttpContext context)
{
    context.Response.ContentType = "text/plain";
    string action = context.Request.Params["action"];
    MethodInfo mi = this.GetType().GetMethod(action);
    mi.Invoke(this, null);
}

public void EncryptPwd()
{
    var context = HttpContext.Current;
    string unEncryptPwd = context.Request.Params["unEncryptPwd"];

    string result = "{"code":1,"msg":""+ DESEncrypt(unEncryptPwd) + ""}";
    context.Response.Write(result);
}
public void DecryptPwd()
{
    var context = HttpContext.Current;
    string EncryptPwd = context.Request.Params["EncryptPwd"];

    string result = "{"code":1,"msg":"" + DESDecrypt(EncryptPwd) + ""}";
    context.Response.Write(result);
}
/// <summary>
/// DES数据加密
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
private string DESEncrypt(string Text, string sKey = "pwdKey")
{
    DESCryptoServiceProvider des = new DESCryptoServiceProvider();
    byte[] inputByteArray;
    inputByteArray = Encoding.Default.GetBytes(Text);
    des.Key = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    des.IV = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    MemoryStream ms = new 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();
}

/// <summary>
/// DES数据解密
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
private string DESDecrypt(string pToDecrypt, string sKey = "pwdKey")
{
    DESCryptoServiceProvider des = new DESCryptoServiceProvider();

    byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
    for (int x = 0; x < pToDecrypt.Length / 2; x++)
    {
        int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
        inputByteArray[x] = (byte)i;
    }

    des.Key = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    des.IV = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
    cs.Write(inputByteArray, 0, inputByteArray.Length);
    cs.FlushFinalBlock();

    StringBuilder ret = new StringBuilder();

    return System.Text.Encoding.Default.GetString(ms.ToArray());
}