c#文本加密程序代码示例

控件滚动方法：

//具体方法
//movegroup(string u, panel p1, panel p2)
//movegroup(方向<或>,被移走的控件,被移入的控件)
//注意还要添加两个timer ：return，next ， interval = 10
        public void movegroup(string u, panel p1, panel p2)
        {
            if (u == ">")     //这是向右，
            {
                up1 = p1;
                up2 = p2;
                p2.visible = true;
                p1.enabled = false;
                p2.enabled = false;
                next.enabled = true;
            }
            if (u == "<")
            {
                up1 = p1;
                up2 = p2;
                p2.visible = true;
                p1.enabled = false;
                p2.enabled = false;
                return.enabled = true;
            }
        }
        panel up1, up2;
        int a = 0;
        int b = -580;
        int i = 0;
        int j = 580;
        private void next_tick(object sender, eventargs e)
        {
            i -= 30;
            j -= 30;
            up1.location = new point(i, up1.location.y);
            up2.location = new point(j, up2.location.y);
            if (i <= -580 || j <= 0)
            {
                next.enabled = false;
                up2.enabled = true;
                up1.enabled = false;
                up1.visible = false;
                i = 0;
                j = 580;
            }
        }
        private void return_tick(object sender, eventargs e)
        {
            a += 30;
            b += 30;
            up1.location = new point(a, up1.location.y);
            up2.location = new point(b, up2.location.y);
            if (a >= 580 || b >= 0)
            {
                return.enabled = false;
                up2.enabled = true;
                up1.visible = false;
                up1.enabled = false;
                a = 0;
                b = -580;
            }
        }

加密原理：

密码+问题+答案的md5 +“/”+加密后的串 组成一个文本文件，（二进制更好了）

解密原理：

先分离出文件里的 密码+问题+答案的md5在与用户输入的密码+问题+答案的md5对比

如果相符则 以此密码解密文件

如果不相符则 提示密码问题及答案错误

我使用des加密，这是一个类

namespace pd_kernel
{
    public class encrypt
    {
        /// <summary>
        /// 进行des加密。
        /// </summary>
        /// <param name="ptoencrypt">要加密的字符串。</param>
        /// <param name="skey">密钥，且必须为8位。</param>
        /// <returns>以base64格式返回的加密字符串。</returns>
        public static string desencrypt(string ptoencrypt, string skey)
        {
            using (descryptoserviceprovider des = new descryptoserviceprovider())
            {
                byte[] inputbytearray = encoding.utf8.getbytes(ptoencrypt);
                des.key = asciiencoding.ascii.getbytes(skey);
                des.iv = asciiencoding.ascii.getbytes(skey);
                system.io.memorystream ms = new system.io.memorystream();
                using (cryptostream cs = new cryptostream(ms, des.createencryptor(), cryptostreammode.write))
                {
                    cs.write(inputbytearray, 0, inputbytearray.length);
                    cs.flushfinalblock();
                    cs.close();
                }
                string str = convert.tobase64string(ms.toarray());
                ms.close();
                return str;
            }
        }

        /// <summary>
        /// 进行des解密。
        /// </summary>
        /// <param name="ptodecrypt">要解密的以base64</param>
        /// <param name="skey">密钥，且必须为8位。</param>
        /// <returns>已解密的字符串。</returns>
        public static string desdecrypt(string ptodecrypt, string skey)
        {
            byte[] inputbytearray = convert.frombase64string(ptodecrypt);
            using (descryptoserviceprovider des = new descryptoserviceprovider())
            {
                des.key = asciiencoding.ascii.getbytes(skey);
                des.iv = asciiencoding.ascii.getbytes(skey);
                system.io.memorystream ms = new system.io.memorystream();
                using (cryptostream cs = new cryptostream(ms, des.createdecryptor(), cryptostreammode.write))
                {
                    cs.write(inputbytearray, 0, inputbytearray.length);
                    cs.flushfinalblock();
                    cs.close();
                }
                string str = encoding.utf8.getstring(ms.toarray());
                ms.close();
                return str;
            }
        }

        public static string md5encrypt(string text, string method)
        {
            string strmd5 = system.web.security.formsauthentication.hashpasswordforstoringinconfigfile(text, method);
            return strmd5;
        }
    }
}