C# DES加密与解密

最新推荐文章于 2025-05-14 14:25:28 发布

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本文介绍了C#中DES加密算法的使用，这是一种对称加密标准。文章提供了一个自编写的加密类，并强调在加密和解密过程中，密钥和初始化向量必须保持一致。

一、DES是一种数据加密标准，属于对称的加密算法体系。

下边是自己写的一个加密类：

<span style="font-size:10px;">using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;
namespace WpfApplication12
{
    /// <summary>
    /// DES密码加密与解密
    /// </summary>
    class DES
    {
        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="password">密码明文</param>
        /// <returns>密码密文</returns>
        public string Encrypt(string password)
        {
            try
            {
                DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
                using (MemoryStream memoryStream = new MemoryStream())
                {
                    using (CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateEncryptor(Encoding.UTF8.GetBytes("ascdefgh"), Encoding.UTF8.GetBytes("ascdefgh")), CryptoStreamMode.Write))                                                                   //加密器对象
                    {
                        cryptoStream.Write(Encoding.UTF8.GetBytes(password), 0, Encoding.UTF8.GetBytes(password).Length);
                        cryptoStream.FlushFinalBlock();
                    }
                    return Convert.ToBase64String(memoryStream.ToArray());
                }
            }
            catch { return ""; }
        }
        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="password">密码密文</param>
        /// <returns>密码明文</returns>
        public string Decrypt(string password)
        {
            DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
            using (MemoryStream memoryStream = new MemoryStream())
            {
                try
                {
                    using (CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateDecryptor(Encoding.UTF8.GetBytes("ascdefgh"), Encoding.UTF8.GetBytes("ascdefgh")), CryptoStreamMode.Write))
                    {
                        cryptoStream.Write(Convert.FromBase64String(password), 0, Convert.FromBase64String(password).Length);
                        cryptoStream.FlushFinalBlock();
                    }
                    return Encoding.UTF8.GetString(memoryStream.ToArray());
                }
                catch
                {
                    return "";
                }
            }
        }
    }
}</span><span style="font-size: 18px;">
</span>

解释：des.CreateDecryptor(btKey, btIV)中的两个参数为：（用于对称算法的密钥，用于对称算法的初始化向量）;

因为是对称算法：所以加密和解密中两个参数必须相同。