X509Certificate2 Classe

Definição

Representa um certificado X.509.Represents an X.509 certificate.

public ref class X509Certificate2 : System::Security::Cryptography::X509Certificates::X509Certificate
[System.Serializable]
public class X509Certificate2 : System.Security.Cryptography.X509Certificates.X509Certificate
type X509Certificate2 = class
    inherit X509Certificate
Public Class X509Certificate2
Inherits X509Certificate
Herança
X509Certificate2
Atributos

Exemplos

O exemplo a seguir demonstra como usar um objeto X509Certificate2 para criptografar e descriptografar um arquivo.The following example demonstrates how to use an X509Certificate2 object to encrypt and decrypt a file.

using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.IO;
using System.Text;

// To run this sample use the Certificate Creation Tool (Makecert.exe) to generate a test X.509 certificate and 
// place it in the local user store. 
// To generate an exchange key and make the key exportable run the following command from a Visual Studio command prompt: 

//makecert -r -pe -n "CN=CERT_SIGN_TEST_CERT" -b 01/01/2010 -e 01/01/2012 -sky exchange -ss my
namespace X509CertEncrypt
{
    class Program
    {

        // Path variables for source, encryption, and
        // decryption folders. Must end with a backslash.
        private static string encrFolder = @"C:\Encrypt\";
        private static string decrFolder = @"C:\Decrypt\";
        private static string originalFile = "TestData.txt";
        private static string encryptedFile = "TestData.enc";

        static void Main(string[] args)
        {

            // Create an input file with test data.
            StreamWriter sw = File.CreateText(originalFile);
            sw.WriteLine("Test data to be encrypted");
            sw.Close();

            // Get the certifcate to use to encrypt the key.
            X509Certificate2 cert = GetCertificateFromStore("CN=CERT_SIGN_TEST_CERT");
            if (cert == null)
            {
                Console.WriteLine("Certificate 'CN=CERT_SIGN_TEST_CERT' not found.");
                Console.ReadLine();
            }

            // Encrypt the file using the public key from the certificate.
            EncryptFile(originalFile, (RSACryptoServiceProvider)cert.PublicKey.Key);

            // Decrypt the file using the private key from the certificate.
            DecryptFile(encryptedFile, (RSACryptoServiceProvider)cert.PrivateKey);

            //Display the original data and the decrypted data.
            Console.WriteLine("Original:   {0}", File.ReadAllText(originalFile));
            Console.WriteLine("Round Trip: {0}", File.ReadAllText(decrFolder + originalFile));
            Console.WriteLine("Press the Enter key to exit.");
            Console.ReadLine();
        }
        private static X509Certificate2 GetCertificateFromStore(string certName)
        {

            // Get the certificate store for the current user.
            X509Store store = new X509Store(StoreLocation.CurrentUser);
            try
            {
                store.Open(OpenFlags.ReadOnly);

                // Place all certificates in an X509Certificate2Collection object.
                X509Certificate2Collection certCollection = store.Certificates;
                // If using a certificate with a trusted root you do not need to FindByTimeValid, instead:
                // currentCerts.Find(X509FindType.FindBySubjectDistinguishedName, certName, true);
                X509Certificate2Collection currentCerts = certCollection.Find(X509FindType.FindByTimeValid, DateTime.Now, false);
                X509Certificate2Collection signingCert = currentCerts.Find(X509FindType.FindBySubjectDistinguishedName, certName, false);
                if (signingCert.Count == 0)
                    return null;
                // Return the first certificate in the collection, has the right name and is current.
                return signingCert[0];
            }
            finally
            {
                store.Close();
            }
        }

        // Encrypt a file using a public key.
        private static void EncryptFile(string inFile, RSACryptoServiceProvider rsaPublicKey)
        {
            using (AesManaged aesManaged = new AesManaged())
            {
                // Create instance of AesManaged for
                // symetric encryption of the data.
                aesManaged.KeySize = 256;
                aesManaged.BlockSize = 128;
                aesManaged.Mode = CipherMode.CBC;
                using (ICryptoTransform transform = aesManaged.CreateEncryptor())
                {
                    RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(rsaPublicKey);
                    byte[] keyEncrypted = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType());

                    // Create byte arrays to contain
                    // the length values of the key and IV.
                    byte[] LenK = new byte[4];
                    byte[] LenIV = new byte[4];

                    int lKey = keyEncrypted.Length;
                    LenK = BitConverter.GetBytes(lKey);
                    int lIV = aesManaged.IV.Length;
                    LenIV = BitConverter.GetBytes(lIV);

                    // Write the following to the FileStream
                    // for the encrypted file (outFs):
                    // - length of the key
                    // - length of the IV
                    // - ecrypted key
                    // - the IV
                    // - the encrypted cipher content

                    int startFileName = inFile.LastIndexOf("\\") + 1;
                    // Change the file's extension to ".enc"
                    string outFile = encrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") - startFileName) + ".enc";
                    Directory.CreateDirectory(encrFolder);

                    using (FileStream outFs = new FileStream(outFile, FileMode.Create))
                    {

                        outFs.Write(LenK, 0, 4);
                        outFs.Write(LenIV, 0, 4);
                        outFs.Write(keyEncrypted, 0, lKey);
                        outFs.Write(aesManaged.IV, 0, lIV);

                        // Now write the cipher text using
                        // a CryptoStream for encrypting.
                        using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
                        {

                            // By encrypting a chunk at
                            // a time, you can save memory
                            // and accommodate large files.
                            int count = 0;
                            int offset = 0;

                            // blockSizeBytes can be any arbitrary size.
                            int blockSizeBytes = aesManaged.BlockSize / 8;
                            byte[] data = new byte[blockSizeBytes];
                            int bytesRead = 0;

                            using (FileStream inFs = new FileStream(inFile, FileMode.Open))
                            {
                                do
                                {
                                    count = inFs.Read(data, offset, blockSizeBytes);
                                    offset += count;
                                    outStreamEncrypted.Write(data, 0, count);
                                    bytesRead += count;
                                }
                                while (count > 0);
                                inFs.Close();
                            }
                            outStreamEncrypted.FlushFinalBlock();
                            outStreamEncrypted.Close();
                        }
                        outFs.Close();
                    }
                }
            }
        }


        // Decrypt a file using a private key.
        private static void DecryptFile(string inFile, RSACryptoServiceProvider rsaPrivateKey)
        {

            // Create instance of AesManaged for
            // symetric decryption of the data.
            using (AesManaged aesManaged = new AesManaged())
            {
                aesManaged.KeySize = 256;
                aesManaged.BlockSize = 128;
                aesManaged.Mode = CipherMode.CBC;

                // Create byte arrays to get the length of
                // the encrypted key and IV.
                // These values were stored as 4 bytes each
                // at the beginning of the encrypted package.
                byte[] LenK = new byte[4];
                byte[] LenIV = new byte[4];

                // Consruct the file name for the decrypted file.
                string outFile = decrFolder + inFile.Substring(0, inFile.LastIndexOf(".")) + ".txt";

                // Use FileStream objects to read the encrypted
                // file (inFs) and save the decrypted file (outFs).
                using (FileStream inFs = new FileStream(encrFolder + inFile, FileMode.Open))
                {

                    inFs.Seek(0, SeekOrigin.Begin);
                    inFs.Seek(0, SeekOrigin.Begin);
                    inFs.Read(LenK, 0, 3);
                    inFs.Seek(4, SeekOrigin.Begin);
                    inFs.Read(LenIV, 0, 3);

                    // Convert the lengths to integer values.
                    int lenK = BitConverter.ToInt32(LenK, 0);
                    int lenIV = BitConverter.ToInt32(LenIV, 0);

                    // Determine the start postition of
                    // the ciphter text (startC)
                    // and its length(lenC).
                    int startC = lenK + lenIV + 8;
                    int lenC = (int)inFs.Length - startC;

                    // Create the byte arrays for
                    // the encrypted AesManaged key,
                    // the IV, and the cipher text.
                    byte[] KeyEncrypted = new byte[lenK];
                    byte[] IV = new byte[lenIV];

                    // Extract the key and IV
                    // starting from index 8
                    // after the length values.
                    inFs.Seek(8, SeekOrigin.Begin);
                    inFs.Read(KeyEncrypted, 0, lenK);
                    inFs.Seek(8 + lenK, SeekOrigin.Begin);
                    inFs.Read(IV, 0, lenIV);
                    Directory.CreateDirectory(decrFolder);
                    // Use RSACryptoServiceProvider
                    // to decrypt the AesManaged key.
                    byte[] KeyDecrypted = rsaPrivateKey.Decrypt(KeyEncrypted, false);

                    // Decrypt the key.
                    using (ICryptoTransform transform = aesManaged.CreateDecryptor(KeyDecrypted, IV))
                    {

                        // Decrypt the cipher text from
                        // from the FileSteam of the encrypted
                        // file (inFs) into the FileStream
                        // for the decrypted file (outFs).
                        using (FileStream outFs = new FileStream(outFile, FileMode.Create))
                        {

                            int count = 0;
                            int offset = 0;

                            int blockSizeBytes = aesManaged.BlockSize / 8;
                            byte[] data = new byte[blockSizeBytes];

                            // By decrypting a chunk a time,
                            // you can save memory and
                            // accommodate large files.

                            // Start at the beginning
                            // of the cipher text.
                            inFs.Seek(startC, SeekOrigin.Begin);
                            using (CryptoStream outStreamDecrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
                            {
                                do
                                {
                                    count = inFs.Read(data, offset, blockSizeBytes);
                                    offset += count;
                                    outStreamDecrypted.Write(data, 0, count);
                                }
                                while (count > 0);

                                outStreamDecrypted.FlushFinalBlock();
                                outStreamDecrypted.Close();
                            }
                            outFs.Close();
                        }
                        inFs.Close();
                    }
                }
            }
        }
    }
}
Imports System.Security.Cryptography
Imports System.Security.Cryptography.X509Certificates
Imports System.IO
Imports System.Text


' To run this sample use the Certificate Creation Tool (Makecert.exe) to generate a test X.509 certificate and 
' place it in the local user store. 
' To generate an exchange key and make the key exportable run the following command from a Visual Studio command prompt: 
'makecert -r -pe -n "CN=CERT_SIGN_TEST_CERT" -b 01/01/2010 -e 01/01/2012 -sky exchange -ss my

Class Program

    ' Path variables for source, encryption, and
    ' decryption folders. Must end with a backslash.
    Private Shared encrFolder As String = "C:\Encrypt\"
    Private Shared decrFolder As String = "C:\Decrypt\"
    Private Shared originalFile As String = "TestData.txt"
    Private Shared encryptedFile As String = "TestData.enc"


    Shared Sub Main(ByVal args() As String)

        ' Create an input file with test data.
        Dim sw As StreamWriter = File.CreateText(originalFile)
        sw.WriteLine("Test data to be encrypted")
        sw.Close()

        ' Get the certifcate to use to encrypt the key.
        Dim cert As X509Certificate2 = GetCertificateFromStore("CN=CERT_SIGN_TEST_CERT")
        If cert Is Nothing Then
            Console.WriteLine("Certificate 'CN=CERT_SIGN_TEST_CERT' not found.")
            Console.ReadLine()
        End If


        ' Encrypt the file using the public key from the certificate.
        EncryptFile(originalFile, CType(cert.PublicKey.Key, RSACryptoServiceProvider))

        ' Decrypt the file using the private key from the certificate.
        DecryptFile(encryptedFile, CType(cert.PrivateKey, RSACryptoServiceProvider))

        'Display the original data and the decrypted data.
        Console.WriteLine("Original:   {0}", File.ReadAllText(originalFile))
        Console.WriteLine("Round Trip: {0}", File.ReadAllText(decrFolder + originalFile))
        Console.WriteLine("Press the Enter key to exit.")
        Console.ReadLine()

    End Sub

    Private Shared Function GetCertificateFromStore(ByVal certName As String) As X509Certificate2
        ' Get the certificate store for the current user.
        Dim store As New X509Store(StoreLocation.CurrentUser)
        Try
            store.Open(OpenFlags.ReadOnly)

            ' Place all certificates in an X509Certificate2Collection object.
            Dim certCollection As X509Certificate2Collection = store.Certificates
            ' If using a certificate with a trusted root you do not need to FindByTimeValid, instead use:
            ' currentCerts.Find(X509FindType.FindBySubjectDistinguishedName, certName, true);
            Dim currentCerts As X509Certificate2Collection = certCollection.Find(X509FindType.FindByTimeValid, DateTime.Now, False)
            Dim signingCert As X509Certificate2Collection = currentCerts.Find(X509FindType.FindBySubjectDistinguishedName, certName, False)
            If signingCert.Count = 0 Then
                Return Nothing
            End If ' Return the first certificate in the collection, has the right name and is current.
            Return signingCert(0)
        Finally
            store.Close()
        End Try


    End Function 'GetCertificateFromStore

    ' Encrypt a file using a public key.
    Private Shared Sub EncryptFile(ByVal inFile As String, ByVal rsaPublicKey As RSACryptoServiceProvider)
        Dim aesManaged As New AesManaged()
        Try
            ' Create instance of AesManaged for
            ' symetric encryption of the data.
            aesManaged.KeySize = 256
            aesManaged.BlockSize = 128
            aesManaged.Mode = CipherMode.CBC
            Dim transform As ICryptoTransform = aesManaged.CreateEncryptor()
            Try
                Dim keyFormatter As New RSAPKCS1KeyExchangeFormatter(rsaPublicKey)
                Dim keyEncrypted As Byte() = keyFormatter.CreateKeyExchange(aesManaged.Key, aesManaged.GetType())

                ' Create byte arrays to contain
                ' the length values of the key and IV.
                Dim LenK(3) As Byte
                Dim LenIV(3) As Byte

                Dim lKey As Integer = keyEncrypted.Length
                LenK = BitConverter.GetBytes(lKey)
                Dim lIV As Integer = aesManaged.IV.Length
                LenIV = BitConverter.GetBytes(lIV)

                ' Write the following to the FileStream
                ' for the encrypted file (outFs):
                ' - length of the key
                ' - length of the IV
                ' - ecrypted key
                ' - the IV
                ' - the encrypted cipher content
                Dim startFileName As Integer = inFile.LastIndexOf("\") + 1
                ' Change the file's extension to ".enc"
                Dim outFile As String = encrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") - startFileName) + ".enc"
                Directory.CreateDirectory(encrFolder)

                Dim outFs As New FileStream(outFile, FileMode.Create)
                Try

                    outFs.Write(LenK, 0, 4)
                    outFs.Write(LenIV, 0, 4)
                    outFs.Write(keyEncrypted, 0, lKey)
                    outFs.Write(aesManaged.IV, 0, lIV)

                    ' Now write the cipher text using
                    ' a CryptoStream for encrypting.
                    Dim outStreamEncrypted As New CryptoStream(outFs, transform, CryptoStreamMode.Write)
                    Try

                        ' By encrypting a chunk at
                        ' a time, you can save memory
                        ' and accommodate large files.
                        Dim count As Integer = 0
                        Dim offset As Integer = 0

                        ' blockSizeBytes can be any arbitrary size.
                        Dim blockSizeBytes As Integer = aesManaged.BlockSize / 8
                        Dim data(blockSizeBytes) As Byte
                        Dim bytesRead As Integer = 0

                        Dim inFs As New FileStream(inFile, FileMode.Open)
                        Try
                            Do
                                count = inFs.Read(data, offset, blockSizeBytes)
                                offset += count
                                outStreamEncrypted.Write(data, 0, count)
                                bytesRead += count
                            Loop While count > 0
                            inFs.Close()
                        Finally
                            inFs.Dispose()
                        End Try
                        outStreamEncrypted.FlushFinalBlock()
                        outStreamEncrypted.Close()
                    Finally
                        outStreamEncrypted.Dispose()
                    End Try
                    outFs.Close()
                Finally
                    outFs.Dispose()
                End Try
            Finally
                transform.Dispose()
            End Try
        Finally
            aesManaged.Dispose()
        End Try

    End Sub


    ' Decrypt a file using a private key.
    Private Shared Sub DecryptFile(ByVal inFile As String, ByVal rsaPrivateKey As RSACryptoServiceProvider)

        ' Create instance of AesManaged for
        ' symetric decryption of the data.
        Dim aesManaged As New AesManaged()
        Try
            aesManaged.KeySize = 256
            aesManaged.BlockSize = 128
            aesManaged.Mode = CipherMode.CBC

            ' Create byte arrays to get the length of
            ' the encrypted key and IV.
            ' These values were stored as 4 bytes each
            ' at the beginning of the encrypted package.
            Dim LenK() As Byte = New Byte(4 - 1) {}
            Dim LenIV() As Byte = New Byte(4 - 1) {}

            ' Consruct the file name for the decrypted file.
            Dim outFile As String = decrFolder + inFile.Substring(0, inFile.LastIndexOf(".")) + ".txt"

            ' Use FileStream objects to read the encrypted
            ' file (inFs) and save the decrypted file (outFs).
            Dim inFs As New FileStream(encrFolder + inFile, FileMode.Open)
            Try

                inFs.Seek(0, SeekOrigin.Begin)
                inFs.Seek(0, SeekOrigin.Begin)
                inFs.Read(LenK, 0, 3)
                inFs.Seek(4, SeekOrigin.Begin)
                inFs.Read(LenIV, 0, 3)

                ' Convert the lengths to integer values.
                Dim lengthK As Integer = BitConverter.ToInt32(LenK, 0)
                Dim lengthIV As Integer = BitConverter.ToInt32(LenIV, 0)

                ' Determine the start postition of
                ' the ciphter text (startC)
                ' and its length(lenC).
                Dim startC As Integer = lengthK + lengthIV + 8
                Dim lenC As Integer = (CType(inFs.Length, Integer) - startC)

                ' Create the byte arrays for
                ' the encrypted Rijndael key,
                ' the IV, and the cipher text.
                Dim KeyEncrypted() As Byte = New Byte(lengthK - 1) {}
                Dim IV() As Byte = New Byte(lengthIV - 1) {}

                ' Extract the key and IV
                ' starting from index 8
                ' after the length values.
                inFs.Seek(8, SeekOrigin.Begin)
                inFs.Read(KeyEncrypted, 0, lengthK)
                inFs.Seek(8 + lengthK, SeekOrigin.Begin)
                inFs.Read(IV, 0, lengthIV)
                Directory.CreateDirectory(decrFolder)
                ' Use RSACryptoServiceProvider
                ' to decrypt the Rijndael key.
                Dim KeyDecrypted As Byte() = rsaPrivateKey.Decrypt(KeyEncrypted, False)

                ' Decrypt the key.
                Dim transform As ICryptoTransform = aesManaged.CreateDecryptor(KeyDecrypted, IV)
                ' Decrypt the cipher text from
                ' from the FileSteam of the encrypted
                ' file (inFs) into the FileStream
                ' for the decrypted file (outFs).
                Dim outFs As New FileStream(outFile, FileMode.Create)
                Try
                    ' Decrypt the cipher text from
                    ' from the FileSteam of the encrypted
                    ' file (inFs) into the FileStream
                    ' for the decrypted file (outFs).

                    Dim count As Integer = 0
                    Dim offset As Integer = 0

                    Dim blockSizeBytes As Integer = aesManaged.BlockSize / 8
                    Dim data(blockSizeBytes) As Byte

                    ' By decrypting a chunk a time,
                    ' you can save memory and
                    ' accommodate large files.
                    ' Start at the beginning
                    ' of the cipher text.
                    inFs.Seek(startC, SeekOrigin.Begin)
                    Dim outStreamDecrypted As New CryptoStream(outFs, transform, CryptoStreamMode.Write)
                    Try
                        Do
                            count = inFs.Read(data, offset, blockSizeBytes)
                            offset += count
                            outStreamDecrypted.Write(data, 0, count)
                        Loop While count > 0

                        outStreamDecrypted.FlushFinalBlock()
                        outStreamDecrypted.Close()
                    Finally
                        outStreamDecrypted.Dispose()
                    End Try
                    outFs.Close()
                Finally
                    outFs.Dispose()
                End Try
                inFs.Close()

            Finally
                inFs.Dispose()

            End Try

        Finally
            aesManaged.Dispose()
        End Try


    End Sub
End Class

O exemplo a seguir cria um executável de linha de comando que usa um arquivo de certificado como um argumento e imprime várias propriedades de certificado no console.The following example creates a command-line executable that takes a certificate file as an argument and prints various certificate properties to the console.

#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Permissions;
using namespace System::IO;
using namespace System::Security::Cryptography::X509Certificates;

//Reads a file.
array<Byte>^ ReadFile( String^ fileName )
{
   FileStream^ f = gcnew FileStream( fileName,FileMode::Open,FileAccess::Read );
   int size = (int)f->Length;
   array<Byte>^data = gcnew array<Byte>(size);
   size = f->Read( data, 0, size );
   f->Close();
   return data;
}

[SecurityPermissionAttribute(SecurityAction::LinkDemand, Unrestricted = true)]
int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();

   //Test for correct number of arguments.
   if ( args->Length < 2 )
   {
      Console::WriteLine( "Usage: CertInfo <filename>" );
      return  -1;
   }

   try
   {
      System::Security::Cryptography::X509Certificates::X509Certificate2 ^ x509 =
            gcnew System::Security::Cryptography::X509Certificates::X509Certificate2;

      //Create X509Certificate2 object from .cer file.
      array<Byte>^rawData = ReadFile( args[ 1 ] );

      x509->Import(rawData);

      //Print to console information contained in the certificate.
      Console::WriteLine( "{0}Subject: {1}{0}", Environment::NewLine, x509->Subject );
      Console::WriteLine( "{0}Issuer: {1}{0}", Environment::NewLine, x509->Issuer );
      Console::WriteLine( "{0}Version: {1}{0}", Environment::NewLine, x509->Version );
      Console::WriteLine( "{0}Valid Date: {1}{0}", Environment::NewLine, x509->NotBefore );
      Console::WriteLine( "{0}Expiry Date: {1}{0}", Environment::NewLine, x509->NotAfter );
      Console::WriteLine( "{0}Thumbprint: {1}{0}", Environment::NewLine, x509->Thumbprint );
      Console::WriteLine( "{0}Serial Number: {1}{0}", Environment::NewLine, x509->SerialNumber );
      Console::WriteLine( "{0}Friendly Name: {1}{0}", Environment::NewLine, x509->PublicKey->Oid->FriendlyName );
      Console::WriteLine( "{0}Public Key Format: {1}{0}", Environment::NewLine, x509->PublicKey->EncodedKeyValue->Format(true) );
      Console::WriteLine( "{0}Raw Data Length: {1}{0}", Environment::NewLine, x509->RawData->Length );
      Console::WriteLine( "{0}Certificate to string: {1}{0}", Environment::NewLine, x509->ToString( true ) );
      Console::WriteLine( "{0}Certificate to XML String: {1}{0}", Environment::NewLine, x509->PublicKey->Key->ToXmlString( false ) );

      //Add the certificate to a X509Store.
      X509Store ^ store = gcnew X509Store;
      store->Open( OpenFlags::MaxAllowed );
      store->Add( x509 );
      store->Close();
   }
   catch ( DirectoryNotFoundException^ )
   {
      Console::WriteLine( "Error: The directory specified could not be found." );
   }
   catch ( IOException^ )
   {
      Console::WriteLine( "Error: A file in the directory could not be accessed." );
   }
   catch ( NullReferenceException^ )
   {
      Console::WriteLine( "File must be a .cer file. Program does not have access to that type of file." );
   }

}

using System;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.IO;
using System.Security.Cryptography.X509Certificates;

class CertInfo
{
    //Reads a file.
    internal static byte[] ReadFile (string fileName)
    {
        FileStream f = new FileStream(fileName, FileMode.Open, FileAccess.Read);
        int size = (int)f.Length;
        byte[] data = new byte[size];
        size = f.Read(data, 0, size);
        f.Close();
        return data;
    }
    //Main method begins here.
    static void Main(string[] args)
    {
        //Test for correct number of arguments.
        if (args.Length < 1)
        {
            Console.WriteLine("Usage: CertInfo <filename>");
            return;
        }
        try
        {
            X509Certificate2 x509 = new X509Certificate2();
            //Create X509Certificate2 object from .cer file.
            byte[] rawData = ReadFile(args[0]);
            x509.Import(rawData);

            //Print to console information contained in the certificate.
            Console.WriteLine("{0}Subject: {1}{0}", Environment.NewLine, x509.Subject);
            Console.WriteLine("{0}Issuer: {1}{0}", Environment.NewLine, x509.Issuer);
            Console.WriteLine("{0}Version: {1}{0}", Environment.NewLine, x509.Version);
            Console.WriteLine("{0}Valid Date: {1}{0}", Environment.NewLine, x509.NotBefore);
            Console.WriteLine("{0}Expiry Date: {1}{0}", Environment.NewLine, x509.NotAfter);
            Console.WriteLine("{0}Thumbprint: {1}{0}", Environment.NewLine, x509.Thumbprint);
            Console.WriteLine("{0}Serial Number: {1}{0}", Environment.NewLine, x509.SerialNumber);
            Console.WriteLine("{0}Friendly Name: {1}{0}", Environment.NewLine, x509.PublicKey.Oid.FriendlyName);
            Console.WriteLine("{0}Public Key Format: {1}{0}", Environment.NewLine, x509.PublicKey.EncodedKeyValue.Format(true));
            Console.WriteLine("{0}Raw Data Length: {1}{0}", Environment.NewLine, x509.RawData.Length);
            Console.WriteLine("{0}Certificate to string: {1}{0}", Environment.NewLine, x509.ToString(true));
            Console.WriteLine("{0}Certificate to XML String: {1}{0}", Environment.NewLine, x509.PublicKey.Key.ToXmlString(false));

            //Add the certificate to a X509Store.
            X509Store store = new X509Store();
            store.Open(OpenFlags.MaxAllowed);
            store.Add(x509);
            store.Close();
        }
        catch (DirectoryNotFoundException)
        {
               Console.WriteLine("Error: The directory specified could not be found.");
        }
        catch (IOException)
        {
            Console.WriteLine("Error: A file in the directory could not be accessed.");
        }
        catch (NullReferenceException)
        {
            Console.WriteLine("File must be a .cer file. Program does not have access to that type of file.");
        }
    }
}
Imports System.Security.Cryptography
Imports System.Security.Permissions
Imports System.IO
Imports System.Security.Cryptography.X509Certificates

Class CertInfo

    'Reads a file.
    Friend Shared Function ReadFile(ByVal fileName As String) As Byte()
        Dim f As New FileStream(fileName, FileMode.Open, FileAccess.Read)
        Dim size As Integer = Fix(f.Length)
        Dim data(size - 1) As Byte
        size = f.Read(data, 0, size)
        f.Close()
        Return data

    End Function 

    <SecurityPermission(SecurityAction.LinkDemand, Unrestricted:=True)> _
    Shared Sub Main(ByVal args() As String)
        'Test for correct number of arguments.
        If args.Length < 1 Then
            Console.WriteLine("Usage: CertInfo <filename>")
            Return
        End If
        Try
            Dim x509 As New X509Certificate2()
            'Create X509Certificate2 object from .cer file.
            Dim rawData As Byte() = ReadFile(args(0))
            
            x509.Import(rawData)

            'Print to console information contained in the certificate.
            Console.WriteLine("{0}Subject: {1}{0}", Environment.NewLine, x509.Subject)
            Console.WriteLine("{0}Issuer: {1}{0}", Environment.NewLine, x509.Issuer)
            Console.WriteLine("{0}Version: {1}{0}", Environment.NewLine, x509.Version)
            Console.WriteLine("{0}Valid Date: {1}{0}", Environment.NewLine, x509.NotBefore)
            Console.WriteLine("{0}Expiry Date: {1}{0}", Environment.NewLine, x509.NotAfter)
            Console.WriteLine("{0}Thumbprint: {1}{0}", Environment.NewLine, x509.Thumbprint)
            Console.WriteLine("{0}Serial Number: {1}{0}", Environment.NewLine, x509.SerialNumber)
            Console.WriteLine("{0}Friendly Name: {1}{0}", Environment.NewLine, x509.PublicKey.Oid.FriendlyName)
            Console.WriteLine("{0}Public Key Format: {1}{0}", Environment.NewLine, x509.PublicKey.EncodedKeyValue.Format(True))
            Console.WriteLine("{0}Raw Data Length: {1}{0}", Environment.NewLine, x509.RawData.Length)
            Console.WriteLine("{0}Certificate to string: {1}{0}", Environment.NewLine, x509.ToString(True))

            Console.WriteLine("{0}Certificate to XML String: {1}{0}", Environment.NewLine, x509.PublicKey.Key.ToXmlString(False))

            'Add the certificate to a X509Store.
            Dim store As New X509Store()
            store.Open(OpenFlags.MaxAllowed)
            store.Add(x509)
            store.Close()

        Catch dnfExcept As DirectoryNotFoundException
            Console.WriteLine("Error: The directory specified could not be found.")
        Catch ioExpcept As IOException
            Console.WriteLine("Error: A file in the directory could not be accessed.")
        Catch nrExcept As NullReferenceException
            Console.WriteLine("File must be a .cer file. Program does not have access to that type of file.")
        End Try

    End Sub
End Class

Comentários

A estrutura X. 509 foi originada nos grupos de trabalho Organização Internacional de Normalização (ISO).The X.509 structure originated in the International Organization for Standardization (ISO) working groups. Essa estrutura pode ser usada para representar vários tipos de informações, incluindo identidade, direitos e atributos de detentor (permissões, idade, sexo, localização, afiliação e assim por diante).This structure can be used to represent various types of information including identity, entitlement, and holder attributes (permissions, age, sex, location, affiliation, and so forth). Embora as especificações ISO sejam mais informativas na estrutura em si, a classe X509Certificate2 foi projetada para modelar os cenários de uso definidos em especificações emitidas pelo grupo de trabalho da infraestrutura de chave pública IETF (Internet Engineering Task Force), X. 509 (PKIX).Although the ISO specifications are most informative on the structure itself, the X509Certificate2 class is designed to model the usage scenarios defined in specifications issued by the Internet Engineering Task Force (IETF) Public Key Infrastructure, X.509 (PKIX) working group. A mais informativo dessas especificações é a RFC 3280, "certificado e o perfil da CRL (lista de certificados revogados)".The most informative of these specifications is RFC 3280, "Certificate and Certificate Revocation List (CRL) Profile."

Importante

A partir do .NET Framework 4.6.NET Framework 4.6, esse tipo implementa a interface IDisposable.Starting with the .NET Framework 4.6.NET Framework 4.6, this type implements the IDisposable interface. Quando você terminar de usar o tipo, deverá descartá-lo direta ou indiretamente.When you have finished using the type, you should dispose of it either directly or indirectly. Para descartar o tipo diretamente, chame o método Dispose dele em um bloco try/catch.To dispose of the type directly, call its Dispose method in a try/catch block. Para descartá-lo indiretamente, use um constructo de linguagem como using ( em C#) ou Using (em Visual Basic).To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). Saiba mais na seção "Como usar um objeto que implementa IDisposable" no tópico da interface IDisposable.For more information, see the "Using an Object that Implements IDisposable" section in the IDisposable interface topic.

Para aplicativos direcionados para o .NET Framework 4.5.2.NET Framework 4.5.2 e versões anteriores, a classe X509Certificate2 não implementa a interface IDisposable e, portanto, não tem um método Dispose.For apps that target the .NET Framework 4.5.2.NET Framework 4.5.2 and earlier versions, the X509Certificate2 class does not implement the IDisposable interface and therefore does not have a Dispose method.

Construtores

X509Certificate2()

Inicializa uma nova instância da classe X509Certificate2.Initializes a new instance of the X509Certificate2 class.

X509Certificate2(Byte[])

Inicializa uma nova instância da classe X509Certificate2 usando informações de uma matriz de bytes.Initializes a new instance of the X509Certificate2 class using information from a byte array.

X509Certificate2(Byte[], SecureString)

Inicializa uma nova instância da classe X509Certificate2 usando uma matriz de bytes e uma senha.Initializes a new instance of the X509Certificate2 class using a byte array and a password.

X509Certificate2(Byte[], SecureString, X509KeyStorageFlags)

Inicializa uma nova instância da classe X509Certificate2 usando uma matriz de bytes, uma senha e um sinalizador de armazenamento de chaves.Initializes a new instance of the X509Certificate2 class using a byte array, a password, and a key storage flag.

X509Certificate2(Byte[], String)

Inicializa uma nova instância da classe X509Certificate2 usando uma matriz de bytes e uma senha.Initializes a new instance of the X509Certificate2 class using a byte array and a password.

X509Certificate2(Byte[], String, X509KeyStorageFlags)

Inicializa uma nova instância da classe X509Certificate2 usando uma matriz de bytes, uma senha e um sinalizador de armazenamento de chaves.Initializes a new instance of the X509Certificate2 class using a byte array, a password, and a key storage flag.

X509Certificate2(IntPtr)

Inicializa uma nova instância da classe X509Certificate2 usando um identificador não gerenciado.Initializes a new instance of the X509Certificate2 class using an unmanaged handle.

X509Certificate2(SerializationInfo, StreamingContext)

Inicializa uma nova instância da classe X509Certificate2 usando as informações de contexto de fluxo e serialização fornecidas.Initializes a new instance of the X509Certificate2 class using the specified serialization and stream context information.

X509Certificate2(String)

Inicializa uma nova instância da classe X509Certificate2 usando um nome de arquivo de certificado.Initializes a new instance of the X509Certificate2 class using a certificate file name.

X509Certificate2(String, SecureString)

Inicializa uma nova instância da classe X509Certificate2 usando um nome de arquivo de certificado e uma senha.Initializes a new instance of the X509Certificate2 class using a certificate file name and a password.

X509Certificate2(String, SecureString, X509KeyStorageFlags)

Inicializa uma nova instância da classe X509Certificate2 usando um nome de arquivo de certificado, uma senha e um sinalizador de armazenamento de chaves.Initializes a new instance of the X509Certificate2 class using a certificate file name, a password, and a key storage flag.

X509Certificate2(String, String)

Inicializa uma nova instância de classe X509Certificate2 usando um nome de arquivo de certificado e uma senha usada para acessar o certificado.Initializes a new instance of the X509Certificate2 class using a certificate file name and a password used to access the certificate.

X509Certificate2(String, String, X509KeyStorageFlags)

Inicializa uma nova instância da classe X509Certificate2 usando um nome de arquivo de certificado, uma senha usada para acessar o certificado e um sinalizador de armazenamento de chaves.Initializes a new instance of the X509Certificate2 class using a certificate file name, a password used to access the certificate, and a key storage flag.

X509Certificate2(X509Certificate)

Inicializa uma nova instância da classe X509Certificate2 usando um objeto X509Certificate.Initializes a new instance of the X509Certificate2 class using an X509Certificate object.

Propriedades

Archived

Obtém ou define um valor que indica que um certificado X.509 será arquivado.Gets or sets a value indicating that an X.509 certificate is archived.

Extensions

Obtém uma coleção de objetos X509Extension .Gets a collection of X509Extension objects.

FriendlyName

Obtém ou define o alias associado para um certificado.Gets or sets the associated alias for a certificate.

Handle

Obtém um identificador para um contexto de certificado da API Criptográfica da Microsoft descrito por uma estrutura PCCERT_CONTEXT não gerenciada.Gets a handle to a Microsoft Cryptographic API certificate context described by an unmanaged PCCERT_CONTEXT structure.

(Herdado de X509Certificate)
HasPrivateKey

Obtém um valor que indica se o objeto X509Certificate2 contém uma chave privada.Gets a value that indicates whether an X509Certificate2 object contains a private key.

Issuer

Obtém o nome da autoridade de certificado que emitiu o certificado X.509v3.Gets the name of the certificate authority that issued the X.509v3 certificate.

(Herdado de X509Certificate)
IssuerName

Obtém o nome diferenciado de um emissor do certificado.Gets the distinguished name of the certificate issuer.

NotAfter

Obtém a data no horário local depois da qual um certificado não é mais válido.Gets the date in local time after which a certificate is no longer valid.

NotBefore

Obtém a data no horário local em que um certificado se torna válido.Gets the date in local time on which a certificate becomes valid.

PrivateKey

Obtém ou define o objeto AsymmetricAlgorithm que representa a chave privada associada a um certificado.Gets or sets the AsymmetricAlgorithm object that represents the private key associated with a certificate.

PublicKey

Obtém um objeto PublicKey associado a um certificado.Gets a PublicKey object associated with a certificate.

RawData

Obtém os dados brutos de um certificado.Gets the raw data of a certificate.

SerialNumber

Obtém o número de série de um certificado como uma cadeia de caracteres hexadecimal big endian.Gets the serial number of a certificate as a big-endian hexadecimal string.

SignatureAlgorithm

Obtém o algoritmo usado para criar a assinatura de um certificado.Gets the algorithm used to create the signature of a certificate.

Subject

Obtém o nome diferenciado da entidade do certificado.Gets the subject distinguished name from the certificate.

(Herdado de X509Certificate)
SubjectName

Obtém o nome diferenciado da entidade de um certificado.Gets the subject distinguished name from a certificate.

Thumbprint

Obtém a impressão digital de um certificado.Gets the thumbprint of a certificate.

Version

Obtém a versão de formato X.509 de um certificado.Gets the X.509 format version of a certificate.

Métodos

Dispose()

Libera todos os recursos usados pelo objeto X509Certificate atual.Releases all resources used by the current X509Certificate object.

(Herdado de X509Certificate)
Dispose(Boolean)

Libera todos os recursos não gerenciados usados por este X509Certificate e, opcionalmente, libera os recursos gerenciados.Releases all of the unmanaged resources used by this X509Certificate and optionally releases the managed resources.

(Herdado de X509Certificate)
Equals(Object)

Compara dois objetos X509Certificate quanto à igualdade.Compares two X509Certificate objects for equality.

(Herdado de X509Certificate)
Equals(X509Certificate)

Compara dois objetos X509Certificate quanto à igualdade.Compares two X509Certificate objects for equality.

(Herdado de X509Certificate)
Export(X509ContentType)

Exporta o objeto X509Certificate atual para uma matriz de bytes em um formato descrito por um dos valores de X509ContentType.Exports the current X509Certificate object to a byte array in a format described by one of the X509ContentType values.

(Herdado de X509Certificate)
Export(X509ContentType, SecureString)

Exporta o objeto X509Certificate atual para uma matriz de bytes usando o formato especificado e uma senha.Exports the current X509Certificate object to a byte array using the specified format and a password.

(Herdado de X509Certificate)
Export(X509ContentType, String)

Exporta o objeto X509Certificate atual para uma matriz de bytes em um formato descrito por um dos valores X509ContentType e com a senha especificada.Exports the current X509Certificate object to a byte array in a format described by one of the X509ContentType values, and using the specified password.

GetCertContentType(Byte[])

Indica o tipo de certificado contido em uma matriz de bytes.Indicates the type of certificate contained in a byte array.

GetCertContentType(String)

Indica o tipo de certificado contido em um arquivo.Indicates the type of certificate contained in a file.

GetCertHash()

Retorna o valor do hash para o certificado x.509v3 como uma matriz de bytes.Returns the hash value for the X.509v3 certificate as an array of bytes.

(Herdado de X509Certificate)
GetCertHash(HashAlgorithmName)

Retorna o valor de hash do certificado X.509v3 que é calculado usando o algoritmo de hash criptográfico especificado.Returns the hash value for the X.509v3 certificate that is computed by using the specified cryptographic hash algorithm.

(Herdado de X509Certificate)
GetCertHashString()

Retorna o valor de hash SHA1 para o certificado X.509 v3 como uma cadeia de caracteres hexadecimal.Returns the SHA1 hash value for the X.509v3 certificate as a hexadecimal string.

(Herdado de X509Certificate)
GetCertHashString(HashAlgorithmName)

Retorna uma cadeia de caracteres hexadecimal que contém o valor de hash do certificado X.509v3 calculado usando algoritmo de hash criptográfico especificado.Returns a hexadecimal string containing the hash value for the X.509v3 certificate computed using the specified cryptographic hash algorithm.

(Herdado de X509Certificate)
GetEffectiveDateString()

Retorna a data de efetivação deste certificado X.509v3.Returns the effective date of this X.509v3 certificate.

(Herdado de X509Certificate)
GetExpirationDateString()

Retorna a data de validade deste certificado X.509v3.Returns the expiration date of this X.509v3 certificate.

(Herdado de X509Certificate)
GetFormat()

Retorna o nome do formato deste certificado X.509v3.Returns the name of the format of this X.509v3 certificate.

(Herdado de X509Certificate)
GetHashCode()

Retorna o código hash do certificado X.509v3 como um inteiro.Returns the hash code for the X.509v3 certificate as an integer.

(Herdado de X509Certificate)
GetIssuerName()

Retorna o nome da autoridade de certificação que emitiu o certificado X.509v3.Returns the name of the certification authority that issued the X.509v3 certificate.

(Herdado de X509Certificate)
GetKeyAlgorithm()

Retorna as informações de algoritmo de chave desse certificado X.509v3 como uma cadeia de caracteres.Returns the key algorithm information for this X.509v3 certificate as a string.

(Herdado de X509Certificate)
GetKeyAlgorithmParameters()

Retorna os parâmetros de algoritmo de chave do certificado X.509v3 como uma matriz de bytes.Returns the key algorithm parameters for the X.509v3 certificate as an array of bytes.

(Herdado de X509Certificate)
GetKeyAlgorithmParametersString()

Retorna os parâmetros do algoritmo de chave do certificado X.509v3 como uma cadeia de caracteres hexadecimal.Returns the key algorithm parameters for the X.509v3 certificate as a hexadecimal string.

(Herdado de X509Certificate)
GetName()

Retorna o nome da entidade de segurança para a qual o certificado foi emitido.Returns the name of the principal to which the certificate was issued.

(Herdado de X509Certificate)
GetNameInfo(X509NameType, Boolean)

Obtém os nomes da entidade e do emissor de um certificado.Gets the subject and issuer names from a certificate.

GetPublicKey()

Retorna a chave pública para o certificado x.509v3 como uma matriz de bytes.Returns the public key for the X.509v3 certificate as an array of bytes.

(Herdado de X509Certificate)
GetPublicKeyString()

Retorna a chave pública do certificado X.509v3 como uma cadeia de caracteres hexadecimal.Returns the public key for the X.509v3 certificate as a hexadecimal string.

(Herdado de X509Certificate)
GetRawCertData()

Retorna os dados brutos de todo o certificado X.509v3 como uma matriz de bytes.Returns the raw data for the entire X.509v3 certificate as an array of bytes.

(Herdado de X509Certificate)
GetRawCertDataString()

Retorna os dados brutos do certificado X.509v3 como uma cadeia de caracteres hexadecimal.Returns the raw data for the entire X.509v3 certificate as a hexadecimal string.

(Herdado de X509Certificate)
GetSerialNumber()

Retorna o número de série do certificado X.509v3 como uma matriz de bytes em ordem little endian.Returns the serial number of the X.509v3 certificate as an array of bytes in little-endian order.

(Herdado de X509Certificate)
GetSerialNumberString()

Retorna o número de série do certificado X.509v3 como uma cadeia de caracteres hexadecimal little endian.Returns the serial number of the X.509v3 certificate as a little-endian hexadecimal string .

(Herdado de X509Certificate)
GetType()

Obtém o Type da instância atual.Gets the Type of the current instance.

(Herdado de Object)
Import(Byte[])

Preenche um objeto X509Certificate2 com os dados de uma matriz de bytes.Populates an X509Certificate2 object with data from a byte array.

Import(Byte[], SecureString, X509KeyStorageFlags)

Popula um objeto X509Certificate2 usando dados de uma matriz de bytes, uma senha e um sinalizador de armazenamento de chaves.Populates an X509Certificate2 object using data from a byte array, a password, and a key storage flag.

Import(Byte[], String, X509KeyStorageFlags)

Preenche um objeto X509Certificate2 usando dados de uma matriz de bytes, uma senha e sinalizadores para determinar como importar a chave privada.Populates an X509Certificate2 object using data from a byte array, a password, and flags for determining how to import the private key.

Import(String)

Preenche um objeto X509Certificate2 com informações de um arquivo de certificado.Populates an X509Certificate2 object with information from a certificate file.

Import(String, SecureString, X509KeyStorageFlags)

Popula um objeto X509Certificate2 com informações de um arquivo de certificado, uma senha e um sinalizador de armazenamento de chaves.Populates an X509Certificate2 object with information from a certificate file, a password, and a key storage flag.

Import(String, String, X509KeyStorageFlags)

Preenche um objeto X509Certificate2 com informações de um arquivo de certificado, uma senha e um valor X509KeyStorageFlags.Populates an X509Certificate2 object with information from a certificate file, a password, and a X509KeyStorageFlags value.

MemberwiseClone()

Cria uma cópia superficial do Object atual.Creates a shallow copy of the current Object.

(Herdado de Object)
Reset()

Redefine o estado de um objeto X509Certificate2.Resets the state of an X509Certificate2 object.

ToString()

Exibe um certificado X.509 no formato de texto.Displays an X.509 certificate in text format.

ToString(Boolean)

Exibe um certificado X.509 no formato de texto.Displays an X.509 certificate in text format.

TryGetCertHash(HashAlgorithmName, Span<Byte>, Int32)

Tenta produzir uma "impressão digital" para o certificado por meio do hash da representação codificada do certificado com o algoritmo de hash especificado.Attempts to produce a "thumbprint" for the certificate by hashing the encoded representation of the certificate with the specified hash algorithm.

(Herdado de X509Certificate)
Verify()

Executa uma validação de cadeia X.509 usando a política de validação básica.Performs a X.509 chain validation using basic validation policy.

Implantações explícitas de interface

IDeserializationCallback.OnDeserialization(Object)

Implementa a interface ISerializable e é chamado novamente pelo evento de desserialização quando a desserialização é concluída.Implements the ISerializable interface and is called back by the deserialization event when deserialization is complete.

(Herdado de X509Certificate)
ISerializable.GetObjectData(SerializationInfo, StreamingContext)

Obtém informações de serialização com todos os dados necessários para recriar uma instância do objeto X509Certificate atual.Gets serialization information with all the data needed to recreate an instance of the current X509Certificate object.

(Herdado de X509Certificate)

Métodos de Extensão

CopyWithPrivateKey(X509Certificate2, DSA)

Combina uma chave privada com a chave pública de um certificado DSA para gerar um novo certificado DSA.Combines a private key with the public key of a DSA certificate to generate a new DSA certificate.

GetDSAPrivateKey(X509Certificate2)

Obtém a chave privada DSA do X509Certificate2.Gets the DSA private key from the X509Certificate2.

GetDSAPublicKey(X509Certificate2)

Obtém a chave pública DSA do X509Certificate2.Gets the DSA public key from the X509Certificate2.

CopyWithPrivateKey(X509Certificate2, ECDsa)

Combina uma chave privada com a chave pública de um certificado ECDsa para gerar um novo certificado ECDSA.Combines a private key with the public key of an ECDsa certificate to generate a new ECDSA certificate.

GetECDsaPrivateKey(X509Certificate2)

Obtém a chave privada ECDsa do certificado X509Certificate2.Gets the ECDsa private key from the X509Certificate2 certificate.

GetECDsaPublicKey(X509Certificate2)

Obtém a chave pública ECDsa do certificado X509Certificate2.Gets the ECDsa public key from the X509Certificate2 certificate.

CopyWithPrivateKey(X509Certificate2, RSA)

Combina uma chave privada com a chave pública de um certificado RSA para gerar um novo certificado RSA.Combines a private key with the public key of an RSA certificate to generate a new RSA certificate.

GetRSAPrivateKey(X509Certificate2)

Obtém a chave privada RSA do X509Certificate2.Gets the RSA private key from the X509Certificate2.

GetRSAPublicKey(X509Certificate2)

Obtém a chave pública RSA do X509Certificate2.Gets the RSA public key from the X509Certificate2.

Aplica-se a