求救！AES加密程序

Question

求助！需要AES 128 对称算法加密程序例子，要求CTR模式的。哪位好心人肯帮小弟一把？不胜感激呀！

Answer 1

微软有个RijndaelManaged类，就是AES加密的 
http://msdn.microsoft.com/zh-cn/library/system.security.cryptography.rijndaelmanaged.aspx简单实现代码如下： /// <summary>
        /// 获取密钥
        /// </summary>
        public static string Key
        {
            get { return @"aabbccddd"; }
        }        /// <summary>
        /// 获取向量
        /// </summary>
        public static string IV
        {
            get { return @"aabbccddeeffgghh"; }
        }
        public static string encryptStringToBytes_AES(string plainText, byte[] Key, byte[] IV)
        {
            MemoryStream msEncrypt = null;
            RijndaelManaged aesAlg = null;            try
            {
                aesAlg = new RijndaelManaged();
                //aesAlg.Key = Key;
                //aesAlg.Key = Key;
                if (Key.Length < 32)
                {
                    byte[] tt = new byte[32];
                    for (int i = 0; i < 32; i++)
                    {
                        tt[i] = 0;
                        if (i < Key.Length)
                            tt[i] = Key[i];                    }
                    aesAlg.Key = tt;
                }
                aesAlg.IV = IV;                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);                msEncrypt = new MemoryStream();
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        swEncrypt.Write(plainText);
                    }
                }
                byte[] enstr = msEncrypt.ToArray();
                msEncrypt.Flush();
                msEncrypt.Close();
                return Convert.ToBase64String(enstr);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (aesAlg != null)
                    aesAlg.Clear();
            }
        }        public static string decryptStringFromBytes_AES(string encryptStr, byte[] Key, byte[] IV)
        {
            RijndaelManaged aesAlg = null;
            string plaintext = null;            try
            {
                aesAlg = new RijndaelManaged();
                byte[] cipherText = Convert.FromBase64String(encryptStr);
                //aesAlg.Key = Key;
                if (Key.Length < 32)
                {
                    byte[] tt = new byte[32];
                    for (int i = 0; i < 32; i++)
                    {
                        tt[i] = 0;
                        if (i < Key.Length)
                            tt[i] = Key[i];                    }
                    aesAlg.Key = tt;
                }
                aesAlg.IV = IV;                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                            plaintext = srDecrypt.ReadToEnd();
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (aesAlg != null)
                    aesAlg.Clear();
            }            return plaintext;
        }

Answer 2

我也看过RijndaelManaged类，但怎么在里面找不到CTR模式的啊？只有CBC、CFB、CTS、ECB、OFB五种模式
。我该怎么办呢？

Answer 3

之前搞错了，现在确定是要ECB模式的，我的代码如下：
            RijndaelManaged aes = new RijndaelManaged();
            ICryptoTransform transform = aes.CreateEncryptor();
            aes.Mode = _cipherMode;//ECB
            aes.Padding = _paddingMode;//PKCS7
            aes.KeySize = 128;
            aes.Key = GetKeyArray(password);//16字节
            byte[] data = transform.TransformFinalBlock(inputData, 0, inputData.Length);
            
            aes.Clear();
            return data;为何返回的data 是32字节的？我第一次接触加密，请高手指教啊！