C# AES 加密

using System.Security.Cryptography;

AES可以直接调用

好像只有ECB CBC CFB可以直接用，CTR OFB不知道怎么用 

    static class MyAES
    {
        static PaddingMode[] padding = {
            PaddingMode.PKCS7,
            PaddingMode.ANSIX923,
            PaddingMode.ISO10126,
            PaddingMode.None,
            PaddingMode.Zeros
        };//这是填充方式

        static public string Encrypt(string Message, string key, string IV, CipherMode Mode, int pad, int length)
        {　　　　　　　　　　　　　　　　　　// 明文　　　　　　密钥　　　　　　向量　　　　加密模式　　　　填充模式　　　　密钥长度　　　　
            try
            {
                //RijndaelManaged aes = new RijndaelManaged();
                Rijndael aes = Rijndael.Create();
                //aes.BlockSize = 128;
                //aes.FeedbackSize = 128;
                aes.KeySize = length;
                aes.Padding = padding[pad];
                aes.Mode = Mode;
                //aes.Key = Encoding.UTF8.GetBytes(key);
                //aes.IV = Encoding.UTF8.GetBytes(IV);


                byte[] keyBytes = Encoding.UTF8.GetBytes(key);
                byte[] keyIV = Encoding.UTF8.GetBytes(IV);
                byte[] inputByteArray = Encoding.UTF8.GetBytes(Message);

                MemoryStream memStream = new MemoryStream();
                CryptoStream crypStream = new CryptoStream(memStream, aes.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);

                crypStream.Write(inputByteArray, 0, inputByteArray.Length);
                crypStream.FlushFinalBlock();
                aes.Clear();
                return Convert.ToBase64String(memStream.ToArray());
            }
            catch { MessageBox.Show("加密失败"); return ""; }
        }
        //AES加密

        static public string Decrypt(string Ciphertext, string key, string IV, CipherMode Mode, int pad, int length)
        {
            try
            {
                //RijndaelManaged aes = new RijndaelManaged();
                Rijndael aes = Rijndael.Create();
                //aes.BlockSize = 128;
                //aes.FeedbackSize = 128;
                //aes.Key = Encoding.UTF8.GetBytes(key);
                //aes.IV = Encoding.UTF8.GetBytes(IV);
                aes.KeySize = length;
                aes.Padding = padding[pad];
                aes.Mode = Mode;

                byte[] keyBytes = Encoding.UTF8.GetBytes(key);
                byte[] keyIV = Encoding.UTF8.GetBytes(IV);
                byte[] outputByteArray = Convert.FromBase64String(Ciphertext);

                MemoryStream memStream = new MemoryStream();
                CryptoStream crypStream = new CryptoStream(memStream, aes.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);
                crypStream.Write(outputByteArray, 0, outputByteArray.Length);
                crypStream.FlushFinalBlock();
                aes.Clear();
                return Encoding.UTF8.GetString(memStream.ToArray());
            }
            catch { MessageBox.Show("加密失败"); return ""; }

        }
        //AES解密




    }