实例介绍
【实例简介】
我的项目当中,考虑到安全性,需要为每个客户端分发一个数字证书,同时使用数字证书中的公私钥来进行数据的加解密。为了完成这个安全模块,特写了如下一个DEMO程序,该DEMO程序包含的功能有:
1:调用.NET2.0的MAKECERT创建含有私钥的数字证书,并存储到个人证书区;
2:将该证书导出为pfx文件,并为其指定一个用来打开pfx文件的password;
3:读取pfx文件,导出pfx中公钥和私钥;
4:用pfx证书中的公钥进行数据的加密,用私钥进行数据的解密;
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Security.Cryptography.X509Certificates;
using System.IO;
namespace WindowsFormsAppPfs
{
public sealed class DataCertificate
{
#region 生成证书
/// <summary>
/// 根据指定的证书名和makecert全路径生成证书(包含公钥和私钥,并保存在MY存储区)
/// </summary>
/// <param name="subjectName"></param>
/// <param name="makecertPath"></param>
/// <returns></returns>
public static bool CreateCertWithPrivateKey(string subjectName, string makecertPath)
{
subjectName = "CN=" subjectName;
string param = " -pe -ss my -n \"" subjectName "\" ";
try
{
Process p = Process.Start(makecertPath, param);
p.WaitForExit();
p.Close();
}
catch (Exception e)
{
throw e;
}
return true;
}
#endregion
#region 文件导入导出
/// <summary>
/// 从WINDOWS证书存储区的个人MY区找到主题为subjectName的证书,
/// 并导出为pfx文件,同时为其指定一个密码
/// 并将证书从个人区删除(如果isDelFromstor为true)
/// </summary>
/// <param name="subjectName">证书主题,不包含CN=</param>
/// <param name="pfxFileName">pfx文件名</param>
/// <param name="password">pfx文件密码</param>
/// <param name="isDelFromStore">是否从存储区删除</param>
/// <returns></returns>
public static bool ExportToPfxFile(string subjectName, string pfxFileName,
string password, bool isDelFromStore)
{
subjectName = "CN=" subjectName;
X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadWrite);
X509Certificate2Collection storecollection = (X509Certificate2Collection)store.Certificates;
foreach (X509Certificate2 x509 in storecollection)
{
if (x509.Subject == subjectName)
{
Debug.Print(string.Format("certificate name: {0}", x509.Subject));
byte[] pfxByte = x509.Export(X509ContentType.Pfx, password);
using (FileStream fileStream = new FileStream(pfxFileName, FileMode.Create))
{
// Write the data to the file, byte by byte.
for (int i = 0; i < pfxByte.Length; i )
fileStream.WriteByte(pfxByte[i]);
// Set the stream position to the beginning of the file.
fileStream.Seek(0, SeekOrigin.Begin);
// Read and verify the data.
for (int i = 0; i < fileStream.Length; i )
{
if (pfxByte[i] != fileStream.ReadByte())
{
throw new Exception("Export pfx error while verify the pfx file");
fileStream.Close();
return false;
}
}
fileStream.Close();
}
if( isDelFromStore == true)
store.Remove(x509);
}
}
store.Close();
store = null;
storecollection = null;
return true;
}
/// <summary>
/// 从WINDOWS证书存储区的个人MY区找到主题为subjectName的证书,
/// 并导出为CER文件(即,只含公钥的)
/// </summary>
/// <param name="subjectName"></param>
/// <param name="cerFileName"></param>
/// <returns></returns>
public static bool ExportToCerFile(string subjectName, string cerFileName)
{
subjectName = "CN=" subjectName;
X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadWrite);
X509Certificate2Collection storecollection = (X509Certificate2Collection)store.Certificates;
foreach (X509Certificate2 x509 in storecollection)
{
if (x509.Subject == subjectName)
{
Debug.Print(string.Format("certificate name: {0}", x509.Subject));
//byte[] pfxByte = x509.Export(X509ContentType.Pfx, password);
byte[] cerByte = x509.Export(X509ContentType.Cert);
using (FileStream fileStream = new FileStream(cerFileName, FileMode.Create))
{
// Write the data to the file, byte by byte.
for (int i = 0; i < cerByte.Length; i )
fileStream.WriteByte(cerByte[i]);
// Set the stream position to the beginning of the file.
fileStream.Seek(0, SeekOrigin.Begin);
// Read and verify the data.
for (int i = 0; i < fileStream.Length; i )
{
if (cerByte[i] != fileStream.ReadByte())
{
throw new Exception("Export CER error while verify the CERT file");
fileStream.Close();
return false;
}
}
fileStream.Close();
}
}
}
store.Close();
store = null;
storecollection = null;
return true;
}
#endregion
#region 从证书中获取信息
/// <summary>
/// 根据私钥证书得到证书实体,得到实体后可以根据其公钥和私钥进行加解密
/// 加解密函数使用DEncrypt的RSACryption类
/// </summary>
/// <param name="pfxFileName"></param>
/// <param name="password"></param>
/// <returns></returns>
public static X509Certificate2 GetCertificateFromPfxFile(string pfxFileName,
string password)
{
try
{
return new X509Certificate2(pfxFileName, password, X509KeyStorageFlags.Exportable);
}
catch (Exception e)
{
throw e;
}
}
/// <summary>
/// 到存储区获取证书
/// </summary>
/// <param name="subjectName"></param>
/// <returns></returns>
public static X509Certificate2 GetCertificateFromStore(string subjectName)
{
subjectName = "CN=" subjectName;
X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadWrite);
X509Certificate2Collection storecollection = (X509Certificate2Collection)store.Certificates;
foreach (X509Certificate2 x509 in storecollection)
{
if (x509.Subject == subjectName)
{
return x509;
}
}
store.Close();
store = null;
storecollection = null;
return null;
}
/// <summary>
/// 根据公钥证书,返回证书实体
/// </summary>
/// <param name="cerPath"></param>
public static X509Certificate2 GetCertFromCerFile(string cerPath)
{
try
{
return new X509Certificate2(cerPath);
}
catch (Exception e)
{
throw e;
}
}
#endregion
}
}
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