Esta documentación está archivada y no tiene mantenimiento.

RSACryptoServiceProvider (Clase)

Realiza el cifrado y descifrado asimétricos utilizando la implementación del algoritmo RSA proporcionada por el proveedor de servicios criptográficos (CSP). No se puede heredar esta clase.

Espacio de nombres: System.Security.Cryptography
Ensamblado: mscorlib (en mscorlib.dll)

[ComVisibleAttribute(true)] 
public sealed class RSACryptoServiceProvider : RSA, ICspAsymmetricAlgorithm
/** @attribute ComVisibleAttribute(true) */ 
public final class RSACryptoServiceProvider extends RSA implements ICspAsymmetricAlgorithm
ComVisibleAttribute(true) 
public final class RSACryptoServiceProvider extends RSA implements ICspAsymmetricAlgorithm

Ésta es la implementación predeterminada de RSA.

RSACryptoServiceProvider admite longitudes de clave desde 384 bits hasta 16384 bits en incrementos de 8 bits si tiene Microsoft Enhanced Cryptographic Provider instalado. Admite longitudes de clave desde 384 bits hasta 512 bits en incrementos de 8 bits si tiene Microsoft Enhanced Cryptographic Provider instalado.

En el ejemplo de código siguiente se utiliza la clase RSACryptoServiceProvider para cifrar una cadena en una matriz de bytes y, a continuación, se descifran los bytes y se convierten nuevamente en una cadena.

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

class RSACSPSample
{

	static void Main()
	{
		try
		{
			//Create a UnicodeEncoder to convert between byte array and string.
			UnicodeEncoding ByteConverter = new UnicodeEncoding();

			//Create byte arrays to hold original, encrypted, and decrypted data.
			byte[] dataToEncrypt = ByteConverter.GetBytes("Data to Encrypt");
			byte[] encryptedData;
			byte[] decryptedData;
			
			//Create a new instance of RSACryptoServiceProvider to generate
			//public and private key data.
			RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

			//Pass the data to ENCRYPT, the public key information 
			//(using RSACryptoServiceProvider.ExportParameters(false),
			//and a boolean flag specifying no OAEP padding.
			encryptedData = RSAEncrypt(dataToEncrypt,RSA.ExportParameters(false), false);

			//Pass the data to DECRYPT, the private key information 
			//(using RSACryptoServiceProvider.ExportParameters(true),
			//and a boolean flag specifying no OAEP padding.
			decryptedData = RSADecrypt(encryptedData,RSA.ExportParameters(true), false);

			//Display the decrypted plaintext to the console. 
			Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
		}
		catch(ArgumentNullException)
		{
			//Catch this exception in case the encryption did
			//not succeed.
			Console.WriteLine("Encryption failed.");

		}
	}

	static public byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
	{
		try
		{	
			//Create a new instance of RSACryptoServiceProvider.
			RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

			//Import the RSA Key information. This only needs
			//toinclude the public key information.
			RSA.ImportParameters(RSAKeyInfo);

			//Encrypt the passed byte array and specify OAEP padding.  
			//OAEP padding is only available on Microsoft Windows XP or
			//later.  
			return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
		}
		//Catch and display a CryptographicException  
		//to the console.
		catch(CryptographicException e)
		{
			Console.WriteLine(e.Message);

			return null;
		}

	}

	static public byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo,bool DoOAEPPadding)
	{
		try
		{
			//Create a new instance of RSACryptoServiceProvider.
			RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

			//Import the RSA Key information. This needs
			//to include the private key information.
			RSA.ImportParameters(RSAKeyInfo);

			//Decrypt the passed byte array and specify OAEP padding.  
			//OAEP padding is only available on Microsoft Windows XP or
			//later.  
			return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
		}
		//Catch and display a CryptographicException  
		//to the console.
		catch(CryptographicException e)
		{
			Console.WriteLine(e.ToString());

			return null;
		}

	}
}

import System.*;
import System.Security.Cryptography.*;
import System.Text.*;

class RSACSPSample
{
    public static void main(String[] args)
    {
        try {
            // Create a UnicodeEncoder to convert between byte array and string.
            UnicodeEncoding byteConverter =  new UnicodeEncoding();
            
            // Create byte arrays to hold original, encrypted, 
            // and decrypted data.
            ubyte dataToEncrypt[] = byteConverter.GetBytes("Data to Encrypt");
            ubyte encryptedData[];
            ubyte decryptedData[];
            
            // Create a new instance of RSACryptoServiceProvider to generate
            // public and private key data.
            RSACryptoServiceProvider rsa =  new RSACryptoServiceProvider();
            
            // Pass the data to ENCRYPT, the public key information 
            // (using RSACryptoServiceProvider.ExportParameters(false),
            // and a boolean flag specifying no OAEP padding.
            encryptedData = RSAEncrypt(dataToEncrypt, 
                rsa.ExportParameters(false), false);
            
            // Pass the data to DECRYPT, the private key information 
            //(using RSACryptoServiceProvider.ExportParameters(true),
            // and a boolean flag specifying no OAEP padding.
            decryptedData = RSADecrypt(encryptedData, 
                rsa.ExportParameters(true), false);
            
            // Display the decrypted plaintext to the console. 
            Console.WriteLine("Decrypted plaintext: {0}", 
                byteConverter.GetString(decryptedData));
        }
        catch (ArgumentNullException exp) {
            //Catch this exception in case the encryption did
            //not succeed.
            Console.WriteLine("Encryption failed.");
        }
    } //main 

    public static ubyte[] RSAEncrypt(ubyte dataToEncrypt[], 
        RSAParameters rsaKeyInfo, boolean doOaepPadding) 
    {
        try {
            // Create a new instance of RSACryptoServiceProvider.
            RSACryptoServiceProvider rsa =  new RSACryptoServiceProvider();
            
            // Import the rsa Key information. This only needs
            // toinclude the public key information.
            rsa.ImportParameters(rsaKeyInfo);
            
            // Encrypt the passed byte array and specify OAEP padding.  
            // OAEP padding is only available on Microsoft Windows XP or
            // later.  
            return rsa.Encrypt(dataToEncrypt, doOaepPadding) ;
        }
        // Catch and display a CryptographicException  
        // to the console.
        catch (CryptographicException e) {
            Console.WriteLine(e.get_Message());
            return null ;
        }
    } //RSAEncrypt

    public static ubyte[] RSADecrypt(ubyte dataToDecrypt[], 
        RSAParameters rsaKeyInfo, boolean doOaepPadding) 
    {
        try {
            // Create a new instance of RSACryptoServiceProvider.
            RSACryptoServiceProvider rsa =  new RSACryptoServiceProvider();
            
            // Import the rsa Key information. This needs
            // to include the private key information.
            rsa.ImportParameters(rsaKeyInfo);
            
            // Decrypt the passed byte array and specify OAEP padding.  
            // OAEP padding is only available on Microsoft Windows XP or
            // later.  
            return rsa.Decrypt(dataToDecrypt, doOaepPadding) ;
        }
        // Catch and display a CryptographicException  
        // to the console.
        catch (CryptographicException e) {
            Console.WriteLine(e.ToString());
            return null ;
        }
    } //RSADecrypt
} //RSACSPSample

En el ejemplo de código siguiente se exporta la información de clave creada utilizando la clase RSACryptoServiceProvider en un objeto RSAParameters.

try
{
    //Create a new RSACryptoServiceProvider object.
    RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();


    //Export the key information to an RSAParameters object.
    //Pass false to export the public key information or pass
    //true to export public and private key information.
    RSAParameters RSAParams = RSA.ExportParameters(false);


}
catch(CryptographicException e)
{
    //Catch this exception in case the encryption did
    //not succeed.
    Console.WriteLine(e.Message);

}

try {
    // Create a new RSACryptoServiceProvider object.
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

    // Export the key information to an RSAParameters object.
    // Pass false to export the public key information or pass
    // true to export public and private key information.
    RSAParameters rsaParams = rsa.ExportParameters(false);
}
catch (CryptographicException e) {
    // Catch this exception in case the encryption did
    // not succeed.
    Console.WriteLine(e.get_Message());
}

System.Object
   System.Security.Cryptography.AsymmetricAlgorithm
     System.Security.Cryptography.RSA
      System.Security.Cryptography.RSACryptoServiceProvider

Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para la ejecución de subprocesos. No se garantiza que los miembros de instancias sean seguros para la ejecución de subprocesos.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Mobile para Smartphone, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter Edition

.NET Framework no admite todas las versiones de cada plataforma. Para obtener una lista de las versiones admitidas, vea Requisitos del sistema.

.NET Framework

Compatible con: 2.0, 1.1, 1.0

.NET Compact Framework

Compatible con: 2.0
Mostrar: