C#實現AES加密解密（AES-128-CBC）

AES算法描述簡介：

DES數據加密標准算法由於密鑰長度較小(56位),已經不適應當今分布式開放網絡對數據加密安全性的要求，因此1997年NIST公開征集新的數據加密標准,即AES。經過三輪的篩選,比利時Joan Daeman和Vincent Rijmen提交的Rijndael算法被提議為AES的最終算法。此算法將成為美國新的數據加密標准而被廣泛應用在各個領域中。盡管人們對AES還有不同的看法,但總體來說,AES作為新一代的數據加密標准匯聚了強安全性、高性能、高效率、易用和靈活等優點。AES設計有三個密鑰長度:128,192,256位，相對而言，AES的128密鑰比DES的56密鑰強1021倍。

 

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

class AESUtil
    {
        /// <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 Byte[] AESEncrypt(Byte[] Data, String Key, String Vector)
        {
            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; // 加密后的密文

            Rijndael Aes = Rijndael.Create();
            try
            {
                // 開辟一塊內存流
                using (MemoryStream Memory = new MemoryStream())
                {
                    // 把內存流對象包裝成加密流對象
                    using (CryptoStream Encryptor = new CryptoStream(Memory,
                     Aes.CreateEncryptor(bKey, bVector),
                     CryptoStreamMode.Write))
                    {
                        // 明文數據寫入加密流
                        Encryptor.Write(Data, 0, Data.Length);
                        Encryptor.FlushFinalBlock();

                        Cryptograph = Memory.ToArray();
                    }
                }
            }
            catch
            {
                Cryptograph = null;
            }

            return 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 Byte[] AESDecrypt(Byte[] Data, String Key, String Vector)
        {
            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; // 解密后的明文

            Rijndael Aes = Rijndael.Create();
            try
            {
                // 開辟一塊內存流，存儲密文
                using (MemoryStream Memory = new MemoryStream(Data))
                {
                    // 把內存流對象包裝成加密流對象
                    using (CryptoStream Decryptor = new CryptoStream(Memory,
                    Aes.CreateDecryptor(bKey, bVector),
                    CryptoStreamMode.Read))
                    {
                        // 明文存儲區
                        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 original;
        }
    }