C# AES CBC加密解密

        public static string Decrypt(string combinedString, string keyString)
        {
            string plainText;
            byte[] combinedData = Convert.FromBase64String(combinedString);
            Aes aes = Aes.Create();
            aes.Key = Encoding.UTF8.GetBytes(keyString);
            byte[] iv = new byte[aes.BlockSize / 8];
            byte[] cipherText = new byte[combinedData.Length - iv.Length];
            Array.Copy(combinedData, iv, iv.Length);
            Array.Copy(combinedData, iv.Length, cipherText, 0, cipherText.Length);
            aes.IV = iv;
            aes.Mode = CipherMode.CBC;
            ICryptoTransform decipher = aes.CreateDecryptor(aes.Key, aes.IV);

            using (MemoryStream ms = new MemoryStream(cipherText))
            {
                using (CryptoStream cs = new CryptoStream(ms, decipher, CryptoStreamMode.Read))
                {
                    using (StreamReader sr = new StreamReader(cs))
                    {
                        plainText = sr.ReadToEnd();
                    }
                }

                return plainText;
            }
        }

        public static string Encrypt(string plainText, string keyString)
        {
            byte[] cipherData;
            Aes aes = Aes.Create();
            aes.Key = Encoding.UTF8.GetBytes(keyString);
            aes.GenerateIV();
            aes.Mode = CipherMode.CBC;
            ICryptoTransform cipher = aes.CreateEncryptor(aes.Key, aes.IV);

            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, cipher, CryptoStreamMode.Write))
                {
                    using (StreamWriter sw = new StreamWriter(cs))
                    {
                        sw.Write(plainText);
                    }
                }

                cipherData = ms.ToArray();
            }

            byte[] combinedData = new byte[aes.IV.Length + cipherData.Length];
            Array.Copy(aes.IV, 0, combinedData, 0, aes.IV.Length);
            Array.Copy(cipherData, 0, combinedData, aes.IV.Length, cipherData.Length);
            return Convert.ToBase64String(combinedData);
        }

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