用C#实现在线数据的加密传输 有一系统,多个客户端向服务器端发送数据,由于数据保密,需要在客户端进行加密后进行传输,然后再在服务器端解密后存入数据库。 现在有如下问题: 2)如果使用B/S结构,不知道如何实现客户端加密较好,希望各位给予帮助! 先谢了。 我对这一方面了解的很少,请说的形象一点谢谢。 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 http://webuc.net/ddf3/archive/2006/06/06/7092.aspxMD5加密 在.net类库里面有很多加密的类,如MD5等等。你可以在using System.Web.Security; 命名空间里找到。 除了 MD5还有其他的吗?因为MD5不可逆,所以就不考虑了 DES 在网上查了资料 像des ras之类的加密应该就可以 我这有个加密的帮助,你试试看看using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Text;using System.IO;using System.Data;using System.Diagnostics;using System.Security;using System.Security.Cryptography;namespace Encrypt{ /// <summary> /// 类名:HashEncrypt /// 作用:对传入的字符串进行Hash运算,返回通过Hash算法加密过的字串。 /// 属性:[无] /// 构造函数额参数: /// IsReturnNum:是否返回为加密后字符的Byte代码 /// IsCaseSensitive:是否区分大小写。 /// 方法:此类提供MD5,SHA1,SHA256,SHA512等四种算法,加密字串的长度依次增大。 /// </summary> public class HashEncrypt { //private string strIN; private bool isReturnNum; private bool isCaseSensitive; /// <summary> /// 构造函数 /// </summary> /// <param name="IsCaseSensitive">是否区分大小写。</param> /// <param name="IsReturnNum">是否返回为加密后字符的Byte代码。</param> public HashEncrypt(bool IsCaseSensitive, bool IsReturnNum) { this.isReturnNum = IsReturnNum; this.isCaseSensitive = IsCaseSensitive; } /// <summary> /// 检测是否区分大小写 /// </summary> /// <param name="strIN">字符串</param> /// <returns></returns> private string getstrIN(string strIN) { //string strIN = strIN; if (strIN.Length == 0) { strIN = "~NULL~"; } if (isCaseSensitive == false) //不区分大小写 { strIN = strIN.ToUpper(); } return strIN; } /// <summary> /// MD5加密与解密 /// </summary> /// <param name="strIN">待加密或解密的字符串</param> /// <returns>加密或解密后的字符串</returns> public string MD5Encrypt(string strIN) { //string strIN = getstrIN(strIN); byte[] tmpByte; MD5 md5 = new MD5CryptoServiceProvider(); tmpByte = md5.ComputeHash(GetKeyByteArray(getstrIN(strIN))); md5.Clear(); return GetStringValue(tmpByte); } /// <summary> /// SHA1加密与解密 /// </summary> /// <param name="strIN">待加密或解密的字符串</param> /// <returns>加密或解密后的字符串</returns> public string SHA1Encrypt(string strIN) { //string strIN = getstrIN(strIN); byte[] tmpByte; SHA1 sha1 = new SHA1CryptoServiceProvider(); tmpByte = sha1.ComputeHash(GetKeyByteArray(strIN)); sha1.Clear(); return GetStringValue(tmpByte); } /// <summary> /// SHA256加密与解密 /// </summary> /// <param name="strIN">待加密或解密的字符串</param> /// <returns>加密或解密后的字符串</returns> public string SHA256Encrypt(string strIN) { //string strIN = getstrIN(strIN); byte[] tmpByte; SHA256 sha256 = new SHA256Managed(); tmpByte = sha256.ComputeHash(GetKeyByteArray(strIN)); sha256.Clear(); return GetStringValue(tmpByte); } /// <summary> /// SHA512加密与解密 /// </summary> /// <param name="strIN">待加密或解密的字符串</param> /// <returns>加密或解密后的字符串</returns> public string SHA512Encrypt(string strIN) { //string strIN = getstrIN(strIN); byte[] tmpByte; SHA512 sha512 = new SHA512Managed(); tmpByte = sha512.ComputeHash(GetKeyByteArray(strIN)); sha512.Clear(); return GetStringValue(tmpByte); } /// <summary> /// 使用DES加密 /// </summary> /// <param name="originalValue">待加密的字符串</param> /// <param name="key">密钥(最大长度8)</param> /// <param name="IV">初始化向量(最大长度8)</param> /// <returns>加密后的字符串</returns> public string DESEncrypt(string originalValue, string key, string IV) { //将key和IV处理成8个字符 key += "12345678"; IV += "12345678"; key = key.Substring(0, 8); IV = IV.Substring(0, 8); SymmetricAlgorithm sa; ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; sa = new DESCryptoServiceProvider(); sa.Key = Encoding.UTF8.GetBytes(key); sa.IV = Encoding.UTF8.GetBytes(IV); ct = sa.CreateEncryptor(); byt = Encoding.UTF8.GetBytes(originalValue); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// 使用DES加密 /// </summary> /// <param name="originalValue">待加密的字符串</param> /// <param name="key">密钥(最大长度8)</param> /// <returns>加密后的字符串</returns> public string DESEncrypt(string originalValue, string key) { return DESEncrypt(originalValue, key, key); } /// <summary> /// 使用DES解密 /// </summary> /// <param name="encryptedValue">待解密的字符串</param> /// <param name="key">密钥(最大长度8)</param> /// <param name="IV">m初始化向量(最大长度8)</param> /// <returns>解密后的字符串</returns> public string DESDecrypt(string encryptedValue, string key, string IV) { //将key和IV处理成8个字符 key += "12345678"; IV += "12345678"; key = key.Substring(0, 8); IV = IV.Substring(0, 8); SymmetricAlgorithm sa; ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; sa = new DESCryptoServiceProvider(); sa.Key = Encoding.UTF8.GetBytes(key); sa.IV = Encoding.UTF8.GetBytes(IV); ct = sa.CreateDecryptor(); byt = Convert.FromBase64String(encryptedValue); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } /// <summary> /// 使用DES解密 /// </summary> /// <param name="encryptedValue">待解密的字符串</param> /// <param name="key">密钥(最大长度8)</param> /// <returns>解密后的字符串</returns> public string DESDecrypt(string encryptedValue, string key) { return DESDecrypt(encryptedValue, key, key); } /// <summary> /// 将二进制数组转为字符串 /// </summary> /// <param name="Byte">二进制数组</param> /// <returns></returns> private string GetStringValue(byte[] Byte) { string tmpString = ""; if (this.isReturnNum == false) { ASCIIEncoding Asc = new ASCIIEncoding(); tmpString = Asc.GetString(Byte); } else { int iCounter; for (iCounter = 0; iCounter < Byte.Length; iCounter++) { tmpString = tmpString + Byte[iCounter].ToString(); } } return tmpString; } /// <summary> /// 返回字符串的二进制数组 /// </summary> /// <param name="strKey">字符串</param> /// <returns></returns> private byte[] GetKeyByteArray(string strKey) { ASCIIEncoding Asc = new ASCIIEncoding(); int tmpStrLen = strKey.Length; byte[] tmpByte = new byte[tmpStrLen - 1]; tmpByte = Asc.GetBytes(strKey); return tmpByte; } }} FileUpload控件有值时,点击按钮进不去后台 一张图片链接到一个页面 datalist里如何得到当前item的索引值 ◆◇◆ DataGrid 前景色的问题! ◆◇◆ 金额显示大写 ,100% 结贴,,Come on! 很白的问题:EventArgs到底写哪个是根据什么确定的 关于在VS.net中写asp.net页面的问题 ASP.NET如何实现定时对业务处理 菜鸟的问题,请各位帮帮忙 偷了一个懒 各位大侠,用javascript怎么访问gridview绑定列里面的内容 用户控件的自定义属性怎么在后台代码中访问?
除了 MD5还有其他的吗?因为MD5不可逆,所以就不考虑了
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;using System.Text;
using System.IO;
using System.Data;
using System.Diagnostics;
using System.Security;
using System.Security.Cryptography;namespace Encrypt
{
/// <summary>
/// 类名:HashEncrypt
/// 作用:对传入的字符串进行Hash运算,返回通过Hash算法加密过的字串。
/// 属性:[无]
/// 构造函数额参数:
/// IsReturnNum:是否返回为加密后字符的Byte代码
/// IsCaseSensitive:是否区分大小写。
/// 方法:此类提供MD5,SHA1,SHA256,SHA512等四种算法,加密字串的长度依次增大。
/// </summary>
public class HashEncrypt
{
//private string strIN;
private bool isReturnNum;
private bool isCaseSensitive; /// <summary>
/// 构造函数
/// </summary>
/// <param name="IsCaseSensitive">是否区分大小写。</param>
/// <param name="IsReturnNum">是否返回为加密后字符的Byte代码。</param>
public HashEncrypt(bool IsCaseSensitive, bool IsReturnNum)
{
this.isReturnNum = IsReturnNum;
this.isCaseSensitive = IsCaseSensitive;
} /// <summary>
/// 检测是否区分大小写
/// </summary>
/// <param name="strIN">字符串</param>
/// <returns></returns>
private string getstrIN(string strIN)
{
//string strIN = strIN;
if (strIN.Length == 0)
{
strIN = "~NULL~";
}
if (isCaseSensitive == false) //不区分大小写
{
strIN = strIN.ToUpper();
}
return strIN;
} /// <summary>
/// MD5加密与解密
/// </summary>
/// <param name="strIN">待加密或解密的字符串</param>
/// <returns>加密或解密后的字符串</returns>
public string MD5Encrypt(string strIN)
{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
MD5 md5 = new MD5CryptoServiceProvider();
tmpByte = md5.ComputeHash(GetKeyByteArray(getstrIN(strIN)));
md5.Clear(); return GetStringValue(tmpByte); } /// <summary>
/// SHA1加密与解密
/// </summary>
/// <param name="strIN">待加密或解密的字符串</param>
/// <returns>加密或解密后的字符串</returns>
public string SHA1Encrypt(string strIN)
{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
SHA1 sha1 = new SHA1CryptoServiceProvider(); tmpByte = sha1.ComputeHash(GetKeyByteArray(strIN));
sha1.Clear(); return GetStringValue(tmpByte); } /// <summary>
/// SHA256加密与解密
/// </summary>
/// <param name="strIN">待加密或解密的字符串</param>
/// <returns>加密或解密后的字符串</returns>
public string SHA256Encrypt(string strIN)
{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
SHA256 sha256 = new SHA256Managed(); tmpByte = sha256.ComputeHash(GetKeyByteArray(strIN));
sha256.Clear(); return GetStringValue(tmpByte); } /// <summary>
/// SHA512加密与解密
/// </summary>
/// <param name="strIN">待加密或解密的字符串</param>
/// <returns>加密或解密后的字符串</returns>
public string SHA512Encrypt(string strIN)
{
//string strIN = getstrIN(strIN);
byte[] tmpByte;
SHA512 sha512 = new SHA512Managed(); tmpByte = sha512.ComputeHash(GetKeyByteArray(strIN));
sha512.Clear(); return GetStringValue(tmpByte); } /// <summary>
/// 使用DES加密
/// </summary>
/// <param name="originalValue">待加密的字符串</param>
/// <param name="key">密钥(最大长度8)</param>
/// <param name="IV">初始化向量(最大长度8)</param>
/// <returns>加密后的字符串</returns>
public string DESEncrypt(string originalValue, string key, string IV)
{
//将key和IV处理成8个字符
key += "12345678";
IV += "12345678";
key = key.Substring(0, 8);
IV = IV.Substring(0, 8); SymmetricAlgorithm sa;
ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
byte[] byt; sa = new DESCryptoServiceProvider();
sa.Key = Encoding.UTF8.GetBytes(key);
sa.IV = Encoding.UTF8.GetBytes(IV);
ct = sa.CreateEncryptor(); byt = Encoding.UTF8.GetBytes(originalValue); ms = new MemoryStream();
cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } /// <summary>
/// 使用DES加密
/// </summary>
/// <param name="originalValue">待加密的字符串</param>
/// <param name="key">密钥(最大长度8)</param>
/// <returns>加密后的字符串</returns>
public string DESEncrypt(string originalValue, string key)
{
return DESEncrypt(originalValue, key, key);
} /// <summary>
/// 使用DES解密
/// </summary>
/// <param name="encryptedValue">待解密的字符串</param>
/// <param name="key">密钥(最大长度8)</param>
/// <param name="IV">m初始化向量(最大长度8)</param>
/// <returns>解密后的字符串</returns>
public string DESDecrypt(string encryptedValue, string key, string IV)
{
//将key和IV处理成8个字符
key += "12345678";
IV += "12345678";
key = key.Substring(0, 8);
IV = IV.Substring(0, 8); SymmetricAlgorithm sa;
ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
byte[] byt; sa = new DESCryptoServiceProvider();
sa.Key = Encoding.UTF8.GetBytes(key);
sa.IV = Encoding.UTF8.GetBytes(IV);
ct = sa.CreateDecryptor(); byt = Convert.FromBase64String(encryptedValue); ms = new MemoryStream();
cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } /// <summary>
/// 使用DES解密
/// </summary>
/// <param name="encryptedValue">待解密的字符串</param>
/// <param name="key">密钥(最大长度8)</param>
/// <returns>解密后的字符串</returns>
public string DESDecrypt(string encryptedValue, string key)
{
return DESDecrypt(encryptedValue, key, key);
} /// <summary>
/// 将二进制数组转为字符串
/// </summary>
/// <param name="Byte">二进制数组</param>
/// <returns></returns>
private string GetStringValue(byte[] Byte)
{
string tmpString = ""; if (this.isReturnNum == false)
{
ASCIIEncoding Asc = new ASCIIEncoding();
tmpString = Asc.GetString(Byte);
}
else
{
int iCounter; for (iCounter = 0; iCounter < Byte.Length; iCounter++)
{
tmpString = tmpString + Byte[iCounter].ToString();
} } return tmpString;
} /// <summary>
/// 返回字符串的二进制数组
/// </summary>
/// <param name="strKey">字符串</param>
/// <returns></returns>
private byte[] GetKeyByteArray(string strKey)
{ ASCIIEncoding Asc = new ASCIIEncoding(); int tmpStrLen = strKey.Length; byte[] tmpByte = new byte[tmpStrLen - 1]; tmpByte = Asc.GetBytes(strKey); return tmpByte; }
}
}