AES\DES 加密

public class AES
{
    //默认密钥向量
    private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };

    public static string Encode(string encryptString, string encryptKey)
    {
        encryptKey = GetSubString(encryptKey, 32, "");
        encryptKey = encryptKey.PadRight(32, ' ');

        RijndaelManaged rijndaelProvider = new RijndaelManaged();
        rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
        rijndaelProvider.IV = Keys;
        ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();

        byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
        byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);

        return Convert.ToBase64String(encryptedData);
    }

    public static string Decode(string decryptString, string decryptKey)
    {
        try
        {
            decryptKey = GetSubString(decryptKey, 32, "");
            decryptKey = decryptKey.PadRight(32, ' ');

            RijndaelManaged rijndaelProvider = new RijndaelManaged();
            rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
            rijndaelProvider.IV = Keys;
            ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();

            byte[] inputData = Convert.FromBase64String(decryptString);
            byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);

            return Encoding.UTF8.GetString(decryptedData);
        }
        catch
        {
            return "";
        }

    }
    public static string GetSubString(string p_SrcString, int p_StartIndex, int p_Length, string p_TailString)
    {
        string myResult = p_SrcString;

        Byte[] bComments = Encoding.UTF8.GetBytes(p_SrcString);
        foreach (char c in Encoding.UTF8.GetChars(bComments))
        {    //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3)
            if ((c > '\u0800' && c < '\u4e00') || (c > '\xAC00' && c < '\xD7A3'))
            {
                //if (System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\xAC00-\xD7A3]+"))
                //当截取的起始位置超出字段串长度时
                if (p_StartIndex >= p_SrcString.Length)
                    return "";
                else
                    return p_SrcString.Substring(p_StartIndex,
                                                   ((p_Length + p_StartIndex) > p_SrcString.Length) ? (p_SrcString.Length - p_StartIndex) : p_Length);
            }
        }

        if (p_Length >= 0)
        {
            byte[] bsSrcString = Encoding.Default.GetBytes(p_SrcString);

            //当字符串长度大于起始位置
            if (bsSrcString.Length > p_StartIndex)
            {
                int p_EndIndex = bsSrcString.Length;

                //当要截取的长度在字符串的有效长度范围内
                if (bsSrcString.Length > (p_StartIndex + p_Length))
                {
                    p_EndIndex = p_Length + p_StartIndex;
                }
                else
                {   //当不在有效范围内时,只取到字符串的结尾

                    p_Length = bsSrcString.Length - p_StartIndex;
                    p_TailString = "";
                }

                int nRealLength = p_Length;
                int[] anResultFlag = new int[p_Length];
                byte[] bsResult = null;

                int nFlag = 0;
                for (int i = p_StartIndex; i < p_EndIndex; i++)
                {
                    if (bsSrcString[i] > 127)
                    {
                        nFlag++;
                        if (nFlag == 3)
                            nFlag = 1;
                    }
                    else
                        nFlag = 0;

                    anResultFlag[i] = nFlag;
                }

                if ((bsSrcString[p_EndIndex - 1] > 127) && (anResultFlag[p_Length - 1] == 1))
                    nRealLength = p_Length + 1;

                bsResult = new byte[nRealLength];

                Array.Copy(bsSrcString, p_StartIndex, bsResult, 0, nRealLength);

                myResult = Encoding.Default.GetString(bsResult);
                myResult = myResult + p_TailString;
            }
        }

        return myResult;
    }
    public static string GetSubString(string p_SrcString, int p_Length, string p_TailString)
    {
        return GetSubString(p_SrcString, 0, p_Length, p_TailString);
    }

}

/// <summary>
/// 加密
/// </summary>
public class DES
{
    //默认密钥向量
    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

    /// <summary>
    /// DES加密字符串
    /// </summary>
    /// <param name="encryptString">待加密的字符串</param>
    /// <param name="encryptKey">加密密钥,要求为8位</param>
    /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
    public static string Encode(string encryptString, string encryptKey)
    {
        encryptKey = GetSubString(encryptKey, 8, "");
        encryptKey = encryptKey.PadRight(8, ' ');
        byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
        byte[] rgbIV = Keys;
        byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
        DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
        MemoryStream mStream = new MemoryStream();
        CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
        cStream.Write(inputByteArray, 0, inputByteArray.Length);
        cStream.FlushFinalBlock();
        return Convert.ToBase64String(mStream.ToArray());

    }

    /// <summary>
    /// DES解密字符串
    /// </summary>
    /// <param name="decryptString">待解密的字符串</param>
    /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
    /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
    public static string Decode(string decryptString, string decryptKey)
    {
        try
        {
            decryptKey = GetSubString(decryptKey, 8, "");
            decryptKey = decryptKey.PadRight(8, ' ');
            byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
            byte[] rgbIV = Keys;
            byte[] inputByteArray = Convert.FromBase64String(decryptString);
            DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();

            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            return Encoding.UTF8.GetString(mStream.ToArray());
        }
        catch
        {
            return "";
        }
    }
    public static string GetSubString(string p_SrcString, int p_StartIndex, int p_Length, string p_TailString)
    {
        string myResult = p_SrcString;

        Byte[] bComments = Encoding.UTF8.GetBytes(p_SrcString);
        foreach (char c in Encoding.UTF8.GetChars(bComments))
        {    //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3)
            if ((c > '\u0800' && c < '\u4e00') || (c > '\xAC00' && c < '\xD7A3'))
            {
                //if (System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\xAC00-\xD7A3]+"))
                //当截取的起始位置超出字段串长度时
                if (p_StartIndex >= p_SrcString.Length)
                    return "";
                else
                    return p_SrcString.Substring(p_StartIndex,
                                                   ((p_Length + p_StartIndex) > p_SrcString.Length) ? (p_SrcString.Length - p_StartIndex) : p_Length);
            }
        }

        if (p_Length >= 0)
        {
            byte[] bsSrcString = Encoding.Default.GetBytes(p_SrcString);

            //当字符串长度大于起始位置
            if (bsSrcString.Length > p_StartIndex)
            {
                int p_EndIndex = bsSrcString.Length;

                //当要截取的长度在字符串的有效长度范围内
                if (bsSrcString.Length > (p_StartIndex + p_Length))
                {
                    p_EndIndex = p_Length + p_StartIndex;
                }
                else
                {   //当不在有效范围内时,只取到字符串的结尾

                    p_Length = bsSrcString.Length - p_StartIndex;
                    p_TailString = "";
                }

                int nRealLength = p_Length;
                int[] anResultFlag = new int[p_Length];
                byte[] bsResult = null;

                int nFlag = 0;
                for (int i = p_StartIndex; i < p_EndIndex; i++)
                {
                    if (bsSrcString[i] > 127)
                    {
                        nFlag++;
                        if (nFlag == 3)
                            nFlag = 1;
                    }
                    else
                        nFlag = 0;

                    anResultFlag[i] = nFlag;
                }

                if ((bsSrcString[p_EndIndex - 1] > 127) && (anResultFlag[p_Length - 1] == 1))
                    nRealLength = p_Length + 1;

                bsResult = new byte[nRealLength];

                Array.Copy(bsSrcString, p_StartIndex, bsResult, 0, nRealLength);

                myResult = Encoding.Default.GetString(bsResult);
                myResult = myResult + p_TailString;
            }
        }

        return myResult;
    }
    public static string GetSubString(string p_SrcString, int p_Length, string p_TailString)
    {
        return GetSubString(p_SrcString, 0, p_Length, p_TailString);
    }
}