//使用X509证书加密解密以及生成证书
#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) { //string makecertPath = "E:\\TFS\\Makecert"; subjectName = "CN=" + subjectName; string param = " -pe -ss my -e 12/31/2099 -n \"" + subjectName + "\" "; try { Process p = Process.Start(makecertPath, param); p.WaitForExit(); p.Close(); Console.WriteLine("Create Key Success"); } catch (Exception e) { //LogRecord.putErrorLog(e.ToString(), "DataCerficate.CreateCertWithPrivateKey"); return false; } 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()) { //LogRecord.putErrorLog("Export pfx error while verify the pfx file!", "ExportToPfxFile"); 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) { cerFileName = "my"; 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) { Console.WriteLine(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()) { //LogRecord.putErrorLog("Export CER error while verify the CERT file!", "ExportToCERFile"); 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) { //LogRecord.putErrorLog("get certificate from pfx" + pfxFileName + " error:" + e.ToString(), //"GetCertificateFromPfxFile"); return null; } } /// <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.LocalMachine); 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) { //LogRecord.putErrorLog(e.ToString(), "DataCertificate.LoadStudentPublicKey"); return null; } } #endregion /// <summary> /// RSA Encrypt, input the public key xml and string need to be encrypted /// </summary> /// <param name="xmlPublicKey">xml format of public key</param> /// <param name="strEncryptString">input string</param> /// <returns>RSA Encrypted String</returns> public static string RSAEncrypt(string xmlPublicKey, string strEncryptString) { RSACryptoServiceProvider provider = new RSACryptoServiceProvider(); provider.FromXmlString(xmlPublicKey); byte[] bytes = new UnicodeEncoding().GetBytes(strEncryptString); return Convert.ToBase64String(provider.Encrypt(bytes, false)); } /// <summary> /// RSA 解密 /// </summary> /// <param name="xmlPrivateKey"></param> /// <param name="m_strDecryptString"></param> /// <returns></returns> public static string RSADecrypt(string xmlPrivateKey, string m_strDecryptString) { RSACryptoServiceProvider provider = new RSACryptoServiceProvider(); provider.FromXmlString(xmlPrivateKey); byte[] rgb = Convert.FromBase64String(m_strDecryptString); byte[] bytes = provider.Decrypt(rgb, false); return new UnicodeEncoding().GetString(bytes); }
上面是一些公共方法，进行加密和解密，获取证书，等等。
下面方法是调用方法生成证书，获取证书的公钥进行加密，使用私钥进行解密。
X509Certificate2 cer = new X509Certificate2(); cer = Cert.GetCertificateFromStore("test"); string publicKey = cer.PublicKey.Key.ToXmlString(false); string privateKey = cer.PrivateKey.ToXmlString(true); string m = Cert.RSAEncrypt(publicKey, "abc"); Console.WriteLine(m); string source = Cert.RSADecrypt(privateKey, m); Console.WriteLine(source);