c# aes/cbc/pkcs5padding 模式的算法

#region 新订购接口加解密
        /// <summary>
        /// 对字符进行UrlEncode编码 与Java通用版
        /// string转Encoding格式
        /// </summary>
        /// <param name="text"></param>
        /// <param name="encod">编码格式</param>
        /// <param name="cap">是否输出大写字母</param>
        /// <returns></returns>
        public static string UrlEncodes(string text, Encoding encod, bool cap = true)
        {
            if (cap)
            {
                StringBuilder builder = new StringBuilder();
                foreach (char c in text)
                {
                    if (System.Web.HttpUtility.UrlEncode(c.ToString(), encod).Length > 1)
                    {
                        builder.Append(System.Web.HttpUtility.UrlEncode(c.ToString(), encod).ToUpper());
                    }
                    else
                    {
                        builder.Append(c);
                    }
                }
                return builder.ToString();
            }
            else
            {
                string encodString = System.Web.HttpUtility.UrlEncode(text, encod);
                return encodString;
            }
        }

        /// <summary>
        /// AES加密 对应java中的 aes/cbc/pkcs5padding 模式的算法
        /// </summary>
        /// <param name="s">待加密的字符串</param>
        /// <param name="sKey">密钥</param>
        /// <returns></returns>
        public static string AesEncrypt(string str, string Key,string IV)
        {
            byte[] keyArray = Encoding.UTF8.GetBytes(Key);
            byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.CBC;
            rDel.Padding = PaddingMode.PKCS7;
            rDel.IV = Encoding.UTF8.GetBytes(IV);
            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        /// <summary>
        /// AES解密  对应java中的 aes/cbc/pkcs5padding 模式的算法
        /// </summary>
        /// <param name="s">待解密的字符串</param>
        /// <param name="sKey">密钥</param>
        /// <returns>返回空为解析失败</returns>
        public static string AesDecrypt(string str, string key,string IV )
        {
            RijndaelManaged rijndaelCipher = new RijndaelManaged();
            rijndaelCipher.Mode = CipherMode.CBC;
            rijndaelCipher.Padding = PaddingMode.PKCS7;
            rijndaelCipher.KeySize = 128;
            rijndaelCipher.BlockSize = 128;
            byte[] encryptedData = Convert.FromBase64String(str);
            byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);
            byte[] keyBytes = new byte[16];
            int len = pwdBytes.Length;
            if (len > keyBytes.Length)
                len = keyBytes.Length;
            System.Array.Copy(pwdBytes, keyBytes, len);
            rijndaelCipher.Key = keyBytes;
            rijndaelCipher.IV = Encoding.UTF8.GetBytes(IV);
            ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
            byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
            return Encoding.UTF8.GetString(plainText);
        }
        public static string GenerateMD5(string txt)
        {
            using (MD5 mi = MD5.Create())
            {
                byte[] buffer = Encoding.Default.GetBytes(txt);
                //开始加密
                byte[] newBuffer = mi.ComputeHash(buffer);
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < newBuffer.Length; i++)
                {
                    sb.Append(newBuffer[i].ToString("x2"));
                }
                return sb.ToString();
            }
        } 
        #endregion