C# 关于这符串加密解密的问题?

Question

请看代码:
就是一个类实现字符串的加密和解密
但是解密总要出错,提是要解密的数据无效
               /// <summary>
        /// 字符串加密
        /// </summary>
        /// <param name="encrypt">要加密的字符串</param>
        /// <returns>加密后的字符串</returns>
        [Obsolete("next version will remove",false)]
        public static string _encryptString(string encrypt)
        {
            try
            {
                byte[] keys = Encoding.UTF8.GetBytes("iloveyou");//8维
                //byte[] iv = Encoding.UTF8.GetBytes("googlego");
                byte[] data = Encoding.UTF8.GetBytes(encrypt);
                DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, desc.CreateEncryptor(keys,keys), CryptoStreamMode.Write);
                cs.Write(data, 0, data.Length);
                cs.FlushFinalBlock();
                ms.Close();
                ms.Dispose();
                cs.Close();
                cs.Dispose();
                //return Encoding.UTF8.GetString(ms.ToArray());
                return Convert.ToBase64String(ms.ToArray());
            }
            catch
            {
                return encrypt;
            }
        }
        /// <summary>
        /// 字符串解密
        /// </summary>
        /// <param name="decrypt">要解密的字符串</param>
        /// <returns>解密后的字符串</returns>
        [Obsolete("this method will come true next version", false)]
        public static string _decryptString(string decrypt)
        {
            try
            {
                byte[] keys = Encoding.UTF8.GetBytes("iloveyou");//Default,ASCII编码都不行,
                byte[] data = Encoding.UTF8.GetBytes(decrypt);
                DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, desc.CreateDecryptor(keys,keys), CryptoStreamMode.Write);
                cs.Read(data, 0, data.Length);
                cs.FlushFinalBlock();//这里出现异常,是-Length否“cs.Length”引发了//System.NotSupportedException”类型的异常 long {System.NotSupportedException} "流不支持查找"                ms.Close();
                ms.Dispose();
                cs.Close();
                cs.Dispose();
                //return Encoding.UTF8.GetString(ms.ToArray());//用这个也不行
                return Convert.ToBase64String(ms.ToArray());
            }
            catch//(Exception exp)
            {
                return decrypt;
            }
        }
就连MSDN(VS2005自带)代码,也会出现异常.
前台调用方法:
private void encrypt_Click(object sender, EventArgs e)
        {
            MessageBox.Show(endeString._encryptString("google"));//显示加密字符串,endeString是加密解密类
        }        private void decrypt_Click(object sender, EventArgs e)
        {
            MessageBox.Show(endeString._decryptString(endeString._encryptString("google")));
        }

Answer 1

这方面有实例的，ＭＳ案例就有，查一下PetShop就ＯＫ了。

Answer 2

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Answer 3

解密：public static string DESDecrypt(string cipher, string key64, string iv64)
{
   byte[] byteskey= ASCIIEncoding.ASCII.GetBytes(key64);
   byte[] bytesiv= ASCIIEncoding.ASCII.GetBytes(iv64);
   byte[] bytesCipher = Convert.FromBase64String(cipher);
   DESCryptoServiceProvider des = new DESCryptoServiceProvider();
   MemoryStream ms = new MemoryStream(bytesCipher);
   CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byteskey, bytesiv), CryptoStreamMode.Read);
   StreamReader sr = new StreamReader(cs);
   string plainText = sr.ReadToEnd();
   sr.Close();
   cs.Close();
   ms.Close();
   return plainText;
}

Answer 4

加密：public static String EncryptDES(string plain, string key64, string iv64)
{
   byte[] byteskey= ASCIIEncoding.ASCII.GetBytes(key64);
   byte[] bytesiv= ASCIIEncoding.ASCII.GetBytes(iv64);
   DESCryptoServiceProvider des = new DESCryptoServiceProvider();
   MemoryStream ms = new MemoryStream();
   CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byteskey, bytesiv), CryptoStreamMode.Write);
   StreamWriter sw = new StreamWriter(cs);
   sw.Write(plain);
   sw.Flush();
   cs.FlushFinalBlock();
   ms.Flush();
   return (Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length));
}

Answer 5

 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byteskey, bytesiv), CryptoStreamMode.Read);//+ Length “cs.Length”引发了“System.NotSupportedException”类型的异常 long {System.NotSupportedException}
//+ base {"流不支持查找。"} System.SystemException {System.NotSupportedException}
报错啊

Answer 6

如果解密时的key或iv不合法，或者和加密时的不一样，就会抛出异常的一般情况下，解密最好用上try...catch

Answer 7

能帮我看看一楼的代码吗?我再跟踪看看key和iv是不是一样的哈

Answer 8

你的代码错误太多，懒得改了。下面是我写的,你自己对比一下。        public  string Encrypt(string PlainText, SymmetricAlgorithm key)
        {
            MemoryStream ms = new MemoryStream();
            CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(encStream);
            sw.Write(PlainText);
            sw.Close();
            encStream.Close();
            string val=Convert.ToBase64String( ms.ToArray());
            ms.Close();
            return val;
        }        public  string Decrypt(string CypherText, SymmetricAlgorithm key)
        {
            byte[] bytes = Convert.FromBase64String(CypherText);
            MemoryStream ms = new MemoryStream(bytes);
            CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(encStream);
            string val = sr.ReadToEnd();
            sr.Close();
            encStream.Close();
            ms.Close();
            return val;
        }        private void button1_Click(object sender, EventArgs e)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            string buffer=Encrypt(textBox1.Text,des);
            label1.Text = Decrypt(buffer, des);
        }

Answer 9

忘了加上key        public  string Encrypt(string PlainText, SymmetricAlgorithm key)
        {
            byte[] keys = Encoding.UTF8.GetBytes("iloveyou");//8维
            MemoryStream ms = new MemoryStream();
            CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(keys,keys), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(encStream);
            sw.Write(PlainText);
            sw.Close();
            encStream.Close();
            string val=Convert.ToBase64String( ms.ToArray());
            ms.Close();
            return val;
        }        public  string Decrypt(string CypherText, SymmetricAlgorithm key)
        {
            byte[] keys = Encoding.UTF8.GetBytes("iloveyou");//8维
            byte[] bytes = Convert.FromBase64String(CypherText);
            MemoryStream ms = new MemoryStream(bytes);
            CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(keys,keys), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(encStream);
            string val = sr.ReadToEnd();
            sr.Close();
            encStream.Close();
            ms.Close();
            return val;
        }        private void button1_Click(object sender, EventArgs e)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            string buffer=Encrypt(textBox1.Text,des);
            label1.Text = Decrypt(buffer, des);
        }