C# AES 加密

	 /// 

    ///   AES 加密解密拓展方法
    /// 
    public static class EncryptionExtension
    {
        /// 

        /// AES加密，并且有向量
        /// 
        /// 需要加密的明文
        /// 秘钥
        /// 向量
        /// 密文
        public static string AESEncryptedString(this string encrypteStr, string key, string vector)
        {
            byte[] aesBytes = Encoding.UTF8.GetBytes(encrypteStr);

            byte[] aesKey = new byte[32];
            //直接转
            Array.Copy(Convert.FromBase64String(key), aesKey, aesKey.Length);
            byte[] aesVector = new byte[16];
            //直接转
            Array.Copy(Convert.FromBase64String(vector), aesVector, aesVector.Length);

            Rijndael Aes = Rijndael.Create();
            //或者采用下方生成Aes
            //RijndaelManaged Aes = new();

            // 开辟一块内存流  
            using MemoryStream memoryStream = new MemoryStream();
            // 把内存流对象包装成加密流对象  
            using CryptoStream cryptoStream = new(memoryStream, Aes.CreateEncryptor(aesKey, aesVector), CryptoStreamMode.Write);
            // 明文数据写入加密流  
            cryptoStream.Write(aesBytes, 0, aesBytes.Length);
            cryptoStream.FlushFinalBlock();

            string result = Convert.ToBase64String(memoryStream.ToArray());
            return result;
        }

        /// 

        /// AES解密，并且有向量
        /// 
        /// 被加密的明文
        /// 秘钥
        /// 向量
        /// 明文
        public static string AESDecryptString(this string decryptStr, string key, string vector)
        {
            byte[] aesBytes = Convert.FromBase64String(decryptStr);
            byte[] aesKey = new byte[32];
            //直接转，可采用不同的方法，但是需与加密方法一致
            Array.Copy(Convert.FromBase64String(key), aesKey, aesKey.Length);
            byte[] aesVector = new byte[16];
            //直接转，可采用不同的方法，但是需与加密方法一致
            Array.Copy(Convert.FromBase64String(vector), aesVector, aesVector.Length);
            Rijndael Aes = Rijndael.Create();
            //或者采用下方生成Aes
            //RijndaelManaged Aes = new();

            // 开辟一块内存流，存储密文  
            using MemoryStream memoryStream = new(aesBytes);
            // 把内存流对象包装成加密流对象  
            using CryptoStream Decryptor = new(memoryStream, Aes.CreateDecryptor(aesKey, aesVector), CryptoStreamMode.Read);
            // 明文存储区  
            using MemoryStream originalMemory = new();
            byte[] Buffer = new byte[1024];
            int readBytes = 0;
            while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0)
            {
                originalMemory.Write(Buffer, 0, readBytes);
            }

            byte[] original = originalMemory.ToArray();
            string result = Convert.ToBase64String(originalMemory.ToArray());
            return result;
        }

        /// 
  
        /// AES加密(无向量)  
        /// 
  
        /// 需要加密的明文  
        /// 密钥  
        /// 密文  
        public  static string AESEncryptedString(this string encrypteStr, string key)
        {
            byte[] aesBytes = Encoding.UTF8.GetBytes(encrypteStr);
            byte[] aesKey = new byte[32];
            //直接转
            //Array.Copy(Convert.FromBase64String(key), aesKey, aesKey.Length);
            //当长度不够时，右侧添加空格
            Array.Copy(Encoding.UTF8.GetBytes(key.PadRight(aesKey.Length)), aesKey, aesKey.Length);

            using MemoryStream memoryStream = new();
            Rijndael Aes = Rijndael.Create();
            //或者采用下方生成Aes
            //RijndaelManaged Aes = new();

            Aes.Mode = CipherMode.ECB;
            Aes.Padding = PaddingMode.PKCS7;
            Aes.KeySize = 128;
            Aes.Key = aesKey;
            using CryptoStream cryptoStream = new(memoryStream, Aes.CreateEncryptor(), CryptoStreamMode.Write);
            cryptoStream.Write(aesBytes, 0, aesBytes.Length);
            cryptoStream.FlushFinalBlock();
            Aes.Clear();
            return Convert.ToBase64String(memoryStream.ToArray());
        }


        /// 
  
        /// AES解密(无向量)  
        /// 
  
        /// 被加密的明文  
        /// 密钥  
        /// 明文  
        public static string AESDecryptString(this string decryptStr, string key)
        {
            byte[] aesBytes = Convert.FromBase64String(decryptStr);
            byte[] aesKey = new byte[32];
            //需要跟加密一致
            //直接转
            //Array.Copy(Convert.FromBase64String(key), aesKey, aesKey.Length);
            //当长度不够时，右侧添加空格
            Array.Copy(Encoding.UTF8.GetBytes(key.PadRight(aesKey.Length)), aesKey, aesKey.Length);

            using MemoryStream memoryStream = new(aesBytes);
            Rijndael Aes = Rijndael.Create();
            //或者采用下方生成Aes
            //RijndaelManaged Aes = new();

            Aes.Mode = CipherMode.ECB;//需与加密方法一致
            Aes.Padding = PaddingMode.PKCS7;//需与加密方法一致
            Aes.KeySize = 128;
            Aes.Key = aesKey;
            using CryptoStream cryptoStream = new(memoryStream, Aes.CreateDecryptor(), CryptoStreamMode.Read);

            byte[] temp = new byte[aesBytes.Length + 32];
            int len = cryptoStream.Read(temp, 0, aesBytes.Length + 32);
            byte[] ret = new byte[len];
            Array.Copy(temp, 0, ret, 0, len);
            Aes.Clear();
            string result = Encoding.UTF8.GetString(ret);
            return result;
        }
    }