C#實現AES加解密方法

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using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;namespace Csharp{    class AESHelper    {        /// <summary>        /// AES加密        /// </summary>        /// <param name="Data">被加密的明文</param>        /// <param name="Key">密鑰</param>        /// <param name="Vector">向量</param>        /// <returns>密文</returns>        public static String AESEncrypt(String Data, String Key, String Vector)        {            Byte[] plainBytes = Encoding.UTF8.GetBytes(Data);            Byte[] bKey = new Byte[32];            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);            Byte[] bVector = new Byte[16];            Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);            Byte[] Cryptograph = null; // 加密後的密文            Rijndael Aes = Rijndael.Create();            try            {                // 開闢一塊記憶體流                using (MemoryStream Memory = new MemoryStream())                {                    // 把記憶體流對象封裝成加密流對象                    using (CryptoStream Encryptor = new CryptoStream(Memory,                     Aes.CreateEncryptor(bKey, bVector),                     CryptoStreamMode.Write))                    {                        // 明文資料寫入加密流                        Encryptor.Write(plainBytes, 0, plainBytes.Length);                        Encryptor.FlushFinalBlock();                        Cryptograph = Memory.ToArray();                    }                }            }            catch            {                Cryptograph = null;            }            return Convert.ToBase64String(Cryptograph);        }        /// <summary>        /// AES解密        /// </summary>        /// <param name="Data">被解密的密文</param>        /// <param name="Key">密鑰</param>        /// <param name="Vector">向量</param>        /// <returns>明文</returns>        public static String AESDecrypt(String Data, String Key, String Vector)        {            Byte[] encryptedBytes = Convert.FromBase64String(Data);            Byte[] bKey = new Byte[32];            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);            Byte[] bVector = new Byte[16];            Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);            Byte[] original = null; // 解密後的明文            Rijndael Aes = Rijndael.Create();            try            {                // 開闢一塊記憶體流，儲存密文                using (MemoryStream Memory = new MemoryStream(encryptedBytes))                {                    // 把記憶體流對象封裝成加密流對象                    using (CryptoStream Decryptor = new CryptoStream(Memory,                    Aes.CreateDecryptor(bKey, bVector),                    CryptoStreamMode.Read))                    {                        // 明文儲存區                        using (MemoryStream originalMemory = new MemoryStream())                        {                            Byte[] Buffer = new Byte[1024];                            Int32 readBytes = 0;                            while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0)                            {                                originalMemory.Write(Buffer, 0, readBytes);                            }                            original = originalMemory.ToArray();                        }                    }                }            }            catch            {                original = null;            }            return Encoding.UTF8.GetString(original);        }        /// <summary>        /// AES加密(無向量)        /// </summary>        /// <param name="plainBytes">被加密的明文</param>        /// <param name="key">密鑰</param>        /// <returns>密文</returns>        public static string AESEncrypt(String Data, String Key)        {            MemoryStream mStream = new MemoryStream();            RijndaelManaged aes = new RijndaelManaged();            byte[] plainBytes = Encoding.UTF8.GetBytes(Data);            Byte[] bKey = new Byte[32];            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);            aes.Mode = CipherMode.ECB;            aes.Padding = PaddingMode.PKCS7;            aes.KeySize = 128;            //aes.Key = _key;            aes.Key = bKey;            //aes.IV = _iV;            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write);            try            {                cryptoStream.Write(plainBytes, 0, plainBytes.Length);                cryptoStream.FlushFinalBlock();                return Convert.ToBase64String(mStream.ToArray());            }            finally            {                cryptoStream.Close();                mStream.Close();                aes.Clear();            }        }        /// <summary>        /// AES解密(無向量)        /// </summary>        /// <param name="encryptedBytes">被加密的明文</param>        /// <param name="key">密鑰</param>        /// <returns>明文</returns>        public static string AESDecrypt(String Data, String Key)        {            Byte[] encryptedBytes = Convert.FromBase64String(Data);            Byte[] bKey = new Byte[32];            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);                        MemoryStream mStream = new MemoryStream(encryptedBytes);            //mStream.Write( encryptedBytes, 0, encryptedBytes.Length );            //mStream.Seek( 0, SeekOrigin.Begin );            RijndaelManaged aes = new RijndaelManaged();            aes.Mode = CipherMode.ECB;            aes.Padding = PaddingMode.PKCS7;            aes.KeySize = 128;            aes.Key = bKey;            //aes.IV = _iV;            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);            try            {                byte[] tmp = new byte[encryptedBytes.Length + 32];                int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32);                byte[] ret = new byte[len];                Array.Copy(tmp, 0, ret, 0, len);                return Encoding.UTF8.GetString(ret);            }            finally            {                cryptoStream.Close();                mStream.Close();                aes.Clear();            }        }    }}

 

C#實現AES加解密方法