C# -DES加解密帮助类

class DesHelper
    {
        #region DES 加密

        /// <summary>
        /// 加密（Hex）
        /// Add by 成长的小猪（Jason.Song） on 2017/07/26
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥(8位任意字符)</param>
        /// <param name="encoding">字符编码</param>
        /// <param name="cipher">运算模式</param>
        /// <param name="padding">填充模式</param>
        /// <returns></returns>
        public static string EncryptToHexString(string encryptString, string encryptKey, Encoding encoding,
            CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.Zeros)
        {
            //为了安全级别更高，这个地方建议将密钥进行MD5后取8位，这里我就不加此方法啦
            //var keyBytes = encoding.GetBytes(Md5Helper.GetMd5HashString(encryptKey, encoding).Substring(0, 8));
            var keyBytes = encoding.GetBytes(encryptKey);
            var inputBytes = encoding.GetBytes(encryptString);
            var outputBytes = EncryptToDesBytes(inputBytes, keyBytes, cipher, padding);
            var sBuilder = new StringBuilder();
            foreach (var b in outputBytes)
            {
                sBuilder.Append(b.ToString("X2"));
            }
            return sBuilder.ToString();
        }

        /// <summary>
        /// 加密（Base64）
        /// Add by 成长的小猪（Jason.Song） on 2017/07/26
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥(8位任意字符)</param>
        /// <param name="encoding">字符编码</param>
        /// <param name="cipher">运算模式</param>
        /// <param name="padding">填充模式</param>
        /// <returns></returns>
        public static string EncryptToBase64String(string encryptString, string encryptKey, Encoding encoding,
            CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.Zeros)
        {
            //为了安全级别更高，这个地方建议将密钥进行MD5后取8位，这里我就不加此方法啦
            //var keyBytes = encoding.GetBytes(Md5Helper.GetMd5HashString(encryptKey, encoding).Substring(0, 8));
            var keyBytes = encoding.GetBytes(encryptKey);
            var inputBytes = encoding.GetBytes(encryptString);
            var outputBytes = EncryptToDesBytes(inputBytes, keyBytes, cipher, padding);
            return Convert.ToBase64String(outputBytes);
        }

        /// <summary>
        /// 加密
        /// Add by 成长的小猪（Jason.Song） on 2017/07/26
        /// </summary>
        /// <param name="encryptBytes">待加密的字节数组</param>
        /// <param name="keyBytes">加密密钥字节数组</param>
        /// <param name="cipher">运算模式</param>
        /// <param name="padding">填充模式</param>
        /// <returns></returns>
        public static byte[] EncryptToDesBytes(byte[] encryptBytes, byte[] keyBytes,
            CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.Zeros)
        {
            var des = new DESCryptoServiceProvider
            {
                Key = keyBytes,
                IV = keyBytes,
                Mode = cipher,
                Padding = padding
            };
            var outputBytes = des.CreateEncryptor().TransformFinalBlock(encryptBytes, 0, encryptBytes.Length);
            return outputBytes;
        }

        #endregion

        #region DES 解密

        /// <summary>
        /// 解密（Hex）
        /// Add by 成长的小猪（Jason.Song） on 2017/07/26
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥(8位任意字符)</param>
        /// <param name="encoding">字符编码</param>
        /// <param name="cipher">运算模式</param>
        /// <param name="padding">填充模式</param>
        /// <returns></returns>
        public static string DecryptByHexString(string decryptString, string decryptKey, Encoding encoding,
            CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7)
        {
            //为了安全级别更高，这个地方建议将密钥进行MD5后取8位，这里我就不加此方法啦
            //var keyBytes = encoding.GetBytes(Md5Helper.GetMd5HashString(encryptKey, encoding).Substring(0, 8));
            var keyBytes = encoding.GetBytes(decryptKey);
            var inputBytes = new byte[decryptString.Length / 2];
            for (var i = 0; i < inputBytes.Length; i++)
            {
                inputBytes[i] = Convert.ToByte(decryptString.Substring(i * 2, 2), 16);
            }
            var outputBytes = DecryptByDesBytes(inputBytes, keyBytes, cipher, padding);
            return encoding.GetString(outputBytes).TrimEnd('');
        }

        /// <summary>
        /// 解密（Base64）
        /// Add by 成长的小猪（Jason.Song） on 2017/07/26
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥(8位任意字符)</param>
        /// <param name="encoding">字符编码</param>
        /// <param name="cipher">运算模式</param>
        /// <param name="padding">填充模式</param>
        /// <returns></returns>
        public static string DecryptByBase64String(string decryptString, string decryptKey, Encoding encoding,
            CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.Zeros)
        {
            //为了安全级别更高，这个地方建议将密钥进行MD5后取8位，这里我就不加此方法啦
            //var keyBytes = encoding.GetBytes(Md5Helper.GetMd5HashString(encryptKey, encoding).Substring(0, 8));
            var keyBytes = encoding.GetBytes(decryptKey);
            var inputBytes = Convert.FromBase64String(decryptString);
            var outputBytes = DecryptByDesBytes(inputBytes, keyBytes, cipher, padding);
            return encoding.GetString(outputBytes).TrimEnd('');
        }

        /// <summary>
        /// 解密
        /// Add by 成长的小猪（Jason.Song） on 2017/07/26
        /// </summary>
        /// <param name="decryptBytes">待解密的字节数组</param>
        /// <param name="keyBytes">解密密钥字节数组</param>
        /// <param name="cipher">运算模式</param>
        /// <param name="padding">填充模式</param>
        /// <returns></returns>
        public static byte[] DecryptByDesBytes(byte[] decryptBytes, byte[] keyBytes,
            CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.Zeros)
        {
            var des = new DESCryptoServiceProvider
            {
                Key = keyBytes,
                IV = keyBytes,
                Mode = cipher,
                Padding = padding
            };
            var outputBytes = des.CreateDecryptor().TransformFinalBlock(decryptBytes, 0, decryptBytes.Length);
            return outputBytes;
        }

        #endregion

    }