RSACryptoServiceProvider クラス

[アーティクル]
03/28/2008

暗号サービスプロバイダ (CSP: Cryptographic Service Provider) によって提供された RSA アルゴリズムの実装を使用して、非対称暗号化および復号化を実行します。このクラスは継承できません。

この型のすべてのメンバの一覧については、RSACryptoServiceProvider メンバを参照してください。

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

NotInheritable Public Class RSACryptoServiceProvider
   Inherits RSA
[C#]
public sealed class RSACryptoServiceProvider : RSA
[C++]
public __gc __sealed class RSACryptoServiceProvider : public RSA
[JScript]
public class RSACryptoServiceProvider extends RSA

スレッドセーフ

この型の public static (Visual Basicでは Shared) のすべてのメンバは、マルチスレッド操作で安全に使用できます。インスタンスのメンバの場合は、スレッドセーフであるとは限りません。

解説

これは RSA の既定の実装です。

使用例

 
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;
        }

    }
}

[C++] 
#using <mscorlib.dll>
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;

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 0;
    }

}

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);

        return 0;
    }

}

int 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(S"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(S"Decrypted plaintext: {0}", ByteConverter->GetString(decryptedData));
    }
    catch(ArgumentNullException*)
    {
        //Catch this exception in case the encryption did
        //not succeed.
        Console::WriteLine(S"Encryption failed.");

    }
}

[Visual Basic] 
Try

    'Create a new RSACryptoServiceProvider object. 
    Dim RSA As 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.
    Dim RSAParams As RSAParameters = RSA.ExportParameters(False)


Catch e As CryptographicException
    'Catch this exception in case the encryption did
    'not succeed.
    Console.WriteLine(e.Message)
End Try

[C#] 
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);

}

[C++] 
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);
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタボタンをクリックします。

必要条件

名前空間: System.Security.Cryptography

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

アセンブリ: Mscorlib (Mscorlib.dll 内)

参照

RSACryptoServiceProvider メンバ | System.Security.Cryptography 名前空間 | 暗号サービス

次の方法で共有

RSACryptoServiceProvider クラス

スレッドセーフ

解説

使用例

必要条件

参照

その他のリソース