CryptoMemoryStream 字符串加密、解密_解密加密文本文件内容并将其复制到memorystream-优快云博客

本文链接：https://blog.youkuaiyun.com/rgh520219/article/details/7565299

本文介绍了一种使用DES算法进行数据加密和解密的方法。通过具体的C#代码示例展示了如何利用.NET Framework提供的加密服务来实现字符串的加密与解密过程，并采用Base64编码作为数据交换格式。

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public class CryptoMemoryStream
    {
        private static readonly string _key = DateTime.Now.ToString("yyyyMMdd");

        #region DESEncrypt DES加密

        // <summary>
        /// 进行DES加密。
        /// </summary>
        /// <param name="pToEncrypt">要加密的字符串。</param>
        /// <param name="sKey">密钥，且必须为8位。</param>
        /// <returns>以Base64格式返回的加密字符串。</returns>
        public static string DESEncrypt(string pToEncrypt, string sKey)
        {
            try
            {
                using (var des = new DESCryptoServiceProvider())////把字符串放到byte数组中 
                {
                    byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
                    des.Key = Encoding.ASCII.GetBytes(sKey);
                    des.IV = Encoding.ASCII.GetBytes(sKey);
                    var ms = new MemoryStream();
                    using (var cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        cs.Close();
                    }
                    string str = Convert.ToBase64String(ms.ToArray());
                    ms.Close();
                    return str.Replace("+", "$$");
                }
            }
            catch(Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        #endregion

        #region DESDecrypt DES解密

        /// <summary>
        /// 进行DES解密。
        /// </summary>
        /// <param name="pToDecrypt">要解密的以Base64</param>
        /// <param name="sKey">密钥，且必须为8位。</param>
        /// <returns>已解密的字符串。</returns>
        public static string DESDecrypt(string pToDecrypt, string sKey)
        {
            try
            {
                byte[] inputByteArray = Convert.FromBase64String(pToDecrypt.Replace("$$", "+"));
                using (var des = new DESCryptoServiceProvider())
                {
                    des.Key = Encoding.ASCII.GetBytes(sKey);
                    des.IV = Encoding.ASCII.GetBytes(sKey);
                    var ms = new MemoryStream();
                    using (var cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        cs.Close();
                    }
                    string str = Encoding.UTF8.GetString(ms.ToArray());
                    ms.Close();
                    return str;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        #endregion

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string EncryptAsc(string source)
        {
            return DESEncrypt(source, _key);
        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string UnEncryptAsc(string source)
        {
            return DESDecrypt(source, _key);
        }
    }