ASP.NET 中Encrypt 加密 DES and AES

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;

/// <summary>
/// DES加密/解密類。
/// </summary>
public class DESEncryptEx1
{
    #region ========加密========
    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="pToEncrypt">要加密的內容</param>
    /// <param name="sKey">密鑰</param>
    /// <returns>返回加密后的字符串</returns>
    public static string Encrypt(string pToEncrypt, string sKey)
    {
        //訪問數據加密標准(DES)算法的加密服務提供程序 (CSP) 版本的包裝對象
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        des.Mode = CipherMode.ECB;
        des.Padding = PaddingMode.PKCS7;
        des.Key = Encoding.UTF8.GetBytes(sKey);　//建立加密對象的密鑰和偏移量
        des.IV = Encoding.UTF8.GetBytes(sKey);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法  |||  如果是用ECB模式，則IV不管是什么都不會影響加密/解密的結果

        byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);//把字符串放到byte數組中

        MemoryStream ms = new MemoryStream();//創建其支持存儲區為內存的流　
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);//定義將數據流鏈接到加密轉換的流
        cs.Write(inputByteArray, 0, inputByteArray.Length);//上面已經完成了把加密后的結果放到內存中去
        cs.FlushFinalBlock();        

        StringBuilder ret = new StringBuilder();
        foreach (byte b in ms.ToArray())
        {
            ret.AppendFormat("{0:X2}", b);
        }
        return ret.ToString();
    }

    /// <summary>
    ///  DES加密
    /// </summary>
    /// <param name="pToEncrypt">要加密的內容</param>
    /// <param name="sKey">密鑰</param>
    /// <param name="StrMs">輸出加密后的字符串</param>
    /// <returns>加密后的byte數組</returns>
    public static byte[] Encrypt(string pToEncrypt, string sKey, out string StrMs)
    {
        //訪問數據加密標准(DES)算法的加密服務提供程序 (CSP) 版本的包裝對象
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        des.Mode = CipherMode.ECB;
        des.Padding = PaddingMode.PKCS7;
        des.Key = Encoding.UTF8.GetBytes(sKey);　//建立加密對象的密鑰和偏移量
        //des.IV = Encoding.UTF8.GetBytes(sKey);　 // 如果是用ECB模式，則IV不管是什么都不會影響加密/解密的結果

        byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);//把字符串放到byte數組中

        MemoryStream ms = new MemoryStream();//創建其支持存儲區為內存的流　
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);//定義將數據流鏈接到加密轉換的流
        cs.Write(inputByteArray, 0, inputByteArray.Length);//上面已經完成了把加密后的結果放到內存中去
        cs.FlushFinalBlock();        

        StringBuilder ret = new StringBuilder();
        foreach (byte b in ms.ToArray())
        {
            ret.AppendFormat("{0:X2}", b);
        }
        StrMs = ret.ToString();
        return ms.ToArray();
    }
    #endregion

    #region ========解密========
    /// <summary>
    /// DEC 解密過程
    /// </summary>
    /// <param name="pToDecrypt">被解密的字符串</param>
    /// <param name="sKey">密鑰（只支持8個字節的密鑰，同前面的加密密鑰相同）</param>
    /// <returns>返回被解密的字符串</returns>
    public static string Decrypt(string pToDecrypt, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        des.Mode = CipherMode.ECB;
        des.Padding = PaddingMode.PKCS7;
        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 = Encoding.UTF8.GetBytes(sKey);　//建立加密對象的密鑰和偏移量，此值重要，不能修改
        //des.IV = Encoding.UTF8.GetBytes(sKey);// 如果是用ECB模式，則IV不管是什么都不會影響加密/解密的結果
        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();

        return System.Text.Encoding.UTF8.GetString(ms.ToArray());
    }

    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="EncryptedDataArray"></param>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string DecryptTextFromMemory(byte[] EncryptedDataArray, string key)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        des.Key = Encoding.UTF8.GetBytes(key);
        des.Padding = PaddingMode.PKCS7;
        des.Mode = CipherMode.ECB;
        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
        cs.Write(EncryptedDataArray, 0, EncryptedDataArray.Length);
        cs.FlushFinalBlock();
        ms.Close();
        cs.Close();

        return System.Text.Encoding.UTF8.GetString(ms.ToArray());
    }
    #endregion


    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="strData">要加密的數據</param>
    /// <param name="strKey">密鑰</param>
    /// <returns>返回Base64編碼后的加密字符串</returns>
    public static string EncryptToBase64(string strData, string strKey)
    {
        string strRtn;
        try
        {
            DESCryptoServiceProvider desc = new DESCryptoServiceProvider();//des進行加密
            desc.Mode = CipherMode.ECB;
            desc.Padding = PaddingMode.PKCS7;
            byte[] key = System.Text.Encoding.UTF8.GetBytes(strKey);
            byte[] data = System.Text.Encoding.UTF8.GetBytes(strData);
            MemoryStream ms = new MemoryStream();//存儲加密后的數據
            CryptoStream cs = new CryptoStream(ms, desc.CreateEncryptor(key, key), CryptoStreamMode.Write);
            cs.Write(data, 0, data.Length);//進行加密
            cs.FlushFinalBlock();
            //return System.Text.Encoding.UTF8.GetString(ms.ToArray());//取加密后的數據
            strRtn = Convert.ToBase64String(ms.ToArray());
            return strRtn;
        }
        catch
        {
            return "";
        }
    }

    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="strData">要解密的數據</param>
    /// <param name="strKey">密鑰</param>
    /// <returns></returns>
    public static string DecryptFromBase64(string strData, string strKey)
    {
        string strRtn;
        try
        {
            DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
            desc.Mode = CipherMode.ECB;
            desc.Padding = PaddingMode.PKCS7;
            byte[] key = System.Text.Encoding.UTF8.GetBytes(strKey);
            //byte[] data = System.Text.Encoding.UTF8.GetBytes(strData);
            byte[] rdata = Convert.FromBase64String(strData);
            MemoryStream ms = new MemoryStream();//存儲解密后的數據
            CryptoStream cs = new CryptoStream(ms, desc.CreateDecryptor(key, key), CryptoStreamMode.Write);
            cs.Write(rdata, 0, rdata.Length);//解密數據
            cs.FlushFinalBlock();
            strRtn = System.Text.Encoding.UTF8.GetString(ms.ToArray());
            return strRtn;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// AES加解密工具類
/// </summary>
public class DESAESEncrypt
{
    #region AES加密
    /// <summary>
    /// AES加密
    /// </summary>
    /// <param name="toEncrypt">要加密的內容</param>
    /// <param name="strKey">密鑰（16或者32位）</param>
    /// <returns>Base64轉碼后的密文</returns>
    public static string Encrypt(string toEncrypt, string strKey)
    {
        byte[] keyArray = UTF8Encoding.UTF8.GetBytes(strKey);
        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        RijndaelManaged rDel = new RijndaelManaged();//using System.Security.Cryptography;    
        rDel.Key = keyArray;
        rDel.Mode = CipherMode.ECB;//using System.Security.Cryptography;    
        rDel.Padding = PaddingMode.PKCS7;//using System.Security.Cryptography;    

        ICryptoTransform cTransform = rDel.CreateEncryptor();//using System.Security.Cryptography;    
        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }
    #endregion AES加密

    #region AES解密
    /// <summary>
    /// AES解密
    /// </summary>
    /// <param name="toDecrypt">要解密的內容</param>
    /// <param name="strKey">密鑰（16或者32位）</param>
    /// <returns>解密后的明文</returns>
    public static string Decrypt(string toDecrypt, string strKey)
    {
        byte[] keyArray = UTF8Encoding.UTF8.GetBytes(strKey);
        byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);

        RijndaelManaged rDel = new RijndaelManaged();
        rDel.Key = keyArray;
        rDel.Mode = CipherMode.ECB;
        rDel.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = rDel.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        return UTF8Encoding.UTF8.GetString(resultArray);
    }
    #endregion AES解密
}