DESCryptoServiceProvider加密解密问题，在线等

Question

解密加密

Answer 1

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="string_2">字符串</param>
        /// <param name="string_3">密钥</param>
        /// <returns></returns>
        private static string smethod_1(string string_2, string string_3)
        {
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
            byte[] bytes = Encoding.Unicode.GetBytes(string_3);
            byte[] buffer = Encoding.Unicode.GetBytes(string_2);
            MemoryStream stream = new MemoryStream();
            CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(bytes, bytes), CryptoStreamMode.Write);
            stream2.Write(buffer, 0, buffer.Length);
            stream2.FlushFinalBlock();
            return Convert.ToBase64String(stream.ToArray());
        }

Answer 2

哥给你贴个例子吧，呵呵        /// <summary>
        /// 类型：方法
        /// 方法名称：加密字符串
        /// 方法说明：根据传入的字符串和密匙返回加密后的字串
        /// </summary>
        /// <param name="strText">加密前的原文</param>
        /// <param name="strKey">密匙</param>
        /// <returns>加密后的字串</returns>
        public static string Encrypt(string strText, string strKey)
        {
            strKey += "etk579@#$am";
            Byte[] byKey = { };
            Byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(strKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                Byte[] inputByteArray = System.Text.Encoding.UTF8.GetBytes(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                //。
                throw ex;
            }        }        /// <summary>
        /// 类型：方法
        /// 方法名称：解密字符串
        /// 方法说明：根据传入的字符串和密匙返回解密后的字串
        /// </summary>
        /// <param name="strText">加密后的密文</param>
        /// <param name="strKey">密匙</param>
        /// <returns>解密后的字串</returns>
        public static string Decrypt(string strText, string strKey)
        {
            strKey += "etk579@#$am";
            Byte[] byKey = { };
            Byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            Byte[] inputByteArray = new byte[strText.Length];
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(strKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                System.Text.Encoding encoding = System.Text.Encoding.UTF8;
                return encoding.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                //。
                throw ex;
            }
        }

Answer 3

DES 是最简单常规的加密方法，一直用没有发现过问题。
////////////////////////////////////////////////////////////////////////////DES加密****************************************************************using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;namespace Component
{
    public class Security
    {
        public Security()
        { 
        
        }        //默认密钥向量
        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        /**//**//**//// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
        public static string EncryptDES(string encryptString, string encryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }        /**//**//**//// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES(string decryptString, string decryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        } 
    }
}