c# 加密解密类

加密/解密操作类

 

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

    /**//// <summary>
    /// Security加密/解密
    /// </summary>
    public class Security
    {
        private static readonly string _StringKey = "a2Nds9Ke"; //加密所需8位密匙

        /**//// <summary>
        /// 加密字符串
        /// </summary>
        /// <param name="QueryString">需要加密的字符串</param>
        /// <returns>加密后的字符串</returns>
        public static string EncryptString(string QueryString)
        {
            return Encrypt(QueryString, _StringKey);
        }

        /**//// <summary>
        /// 解密字符串
        /// </summary>
        /// <param name="QueryString">需要解密的字符串</param>
        /// <returns>解密后的字符串</returns>
        public static string DecryptString(string QueryString)
        {
            return Decrypt(QueryString, _StringKey);
        }

        /**//// <summary>
        /// 加密字符串，自定义8位密匙
        /// 加密密匙必须与解密密匙相同
        /// </summary>
        /// <param name="pToEncrypt">需要加密的字符串</param>
        /// <param name="sKey">8位字符密匙</param>
        /// <returns>加密后的字符串</returns>
        protected static string Encrypt(string pToEncrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();　//把字符串放到byte数组中

            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
            //byte[]　inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
            MemoryStream ms = new MemoryStream();　　 //使得输入密码必须输入英文文本
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }

        /**//// <summary>
        /// 解密字符串，自定义8位密匙
        /// 加密密匙必须与解密密匙相同
        /// </summary>
        /// <param name="pToDecrypt">需要解密的字符串</param>
        /// <param name="sKey">8位字符密匙</param>
        /// <returns>解密后的字符串</returns>
        protected static string Decrypt(string pToDecrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量，此值重要，不能修改
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();　//建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }

}

 

 

 

一个Java的加密解密类转成C#的加密解密类（最注意保持结果一致）

/// <summary>
    /// 字符串DES加密及解密类
    /// </summary>
    public  class secret_string
    {
        //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;
            }
        }
    }

我用的这个des加密解密的密钥字符有受到限制，使用有些密钥加密后接不能解密，如123456aaa，就不能解密！有没有密钥不限制字符的解密类！

 

 

//=======================================================================================

 

【C#源码】DES加密解密类

2009年07月07日 星期二 06:48 P.M.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security.Cryptography;
using System.Collections;

namespace Deking
{
        class DesEncryption
        {
//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;
                        }
                }
        }
                public void DesEncrypt(string sInputFilename, string sOutputFilename, string key) //加密解密类
                {
                        string sKey;
                        FileStream fsInput = new FileStream(sInputFilename,
                        FileMode.Open,
                        FileAccess.Read);

                        FileStream fsEncrypted = new FileStream(sOutputFilename,
                           FileMode.Create,
                           FileAccess.Write);
                        DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
                        if (key.Length >= 8)
                                sKey = key.Substring(0, 8);
                        else
                        {
                                sKey = key.PadRight(8, '1');
                        }
                        DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                        DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                        ICryptoTransform desencrypt = DES.CreateEncryptor();
                        CryptoStream cryptostream = new CryptoStream(fsEncrypted,
                           desencrypt,
                           CryptoStreamMode.Write);
                        byte[] bytearrayinput = new byte[fsInput.Length];
                        fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
                        cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
                        cryptostream.Close();
                        fsInput.Close();
                        fsEncrypted.Close();
                        System.IO.File.Delete(sInputFilename);

                }
                public void DesDecrypt(string sInputFilename,
                            string sOutputFilename,
                            string key)
                {
                        string sKey;
                        DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
                        //
                        // 转换key为8位
                        //

                        if (key.Length >= 8)
                                sKey = key.Substring(0, 8);
                        else
                        {
                                sKey = key.PadRight(8, '1');
                        }
                        DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                        //Set initialization vector.
                        DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                        FileStream fsread = new FileStream(sInputFilename,
                                                       FileMode.Open,
                                                       FileAccess.Read);
                        FileStream fswrite = new FileStream(sOutputFilename,
                                                       FileMode.Create,
                                                       FileAccess.Write);
                        ICryptoTransform desdecrypt = DES.CreateDecryptor();
                        CryptoStream cryptostreamDecr = new CryptoStream(fswrite,
                                                                     desdecrypt,
                                                                     CryptoStreamMode.Write);
                        byte[] bytearrayinput = new byte[fsread.Length];
                        fsread.Read(bytearrayinput, 0, bytearrayinput.Length);
                        cryptostreamDecr.Write(bytearrayinput, 0, bytearrayinput.Length);
                        cryptostreamDecr.Close();
                        fswrite.Close();
                        fsread.Close();
                        System.IO.File.Delete(sInputFilename);
                }
               

        }
}