RijndaelManaged.GenerateKey メソッド

.NET Framework クラス ライブラリ リファレンス

RijndaelManaged.GenerateKey メソッド

アルゴリズムで使用するランダムな Key を生成します。

名前空間: System.Security.Cryptography
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Overrides Sub GenerateKey

Visual Basic (使用法)

Dim instance As RijndaelManaged

instance.GenerateKey

C#

public override void GenerateKey ()

C++

public:
virtual void GenerateKey () override

J#

public void GenerateKey ()

JScript

public override function GenerateKey ()

解説

ランダムなキーが指定されていない場合は、このメソッドを使用して生成します。

使用例

Visual Basic

Imports System
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography

Namespace RijndaelManaged_Examples
    Class MyMainClass
        Public Shared Sub
 Main()
            Dim original As String
 = "This is a much longer string of data than a public/private
 key algorithm will accept."
            Dim roundtrip As String
            Dim textConverter As New
 ASCIIEncoding()
            Dim myRijndael As New
 RijndaelManaged()
            Dim fromEncrypt() As Byte
            Dim encrypted() As Byte
            Dim toEncrypt() As Byte
            Dim key() As Byte
            Dim IV() As Byte

            'Create a new key and initialization vector.
            myRijndael.GenerateKey()
            myRijndael.GenerateIV()

            'Get the key and IV.
            key = myRijndael.Key
            IV = myRijndael.IV

            'Get an encryptor.
            Dim encryptor As ICryptoTransform
 = myRijndael.CreateEncryptor(key, IV)

            'Encrypt the data.
            Dim msEncrypt As New
 MemoryStream()
            Dim csEncrypt As New
 CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)

            'Convert the data to a byte array.
            toEncrypt = textConverter.GetBytes(original)

            'Write all data to the crypto stream and flush it.
            csEncrypt.Write(toEncrypt, 0, toEncrypt.Length)
            csEncrypt.FlushFinalBlock()

            'Get encrypted array of bytes.
            encrypted = msEncrypt.ToArray()

            'This is where the message would be transmitted to a recipient
            ' who already knows your secret key. Optionally, you can
            ' also encrypt your secret key using a public key algorithm
            ' and pass it to the mesage recipient along with the RijnDael
            ' encrypted message.            
            'Get a decryptor that uses the same key and IV as the encryptor.
            Dim decryptor As ICryptoTransform
 = myRijndael.CreateDecryptor(key, IV)

            'Now decrypt the previously encrypted message using the
 decryptor
            ' obtained in the above step.
            Dim msDecrypt As New
 MemoryStream(encrypted)
            Dim csDecrypt As New
 CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)

            fromEncrypt = New Byte(encrypted.Length)
 {}

            'Read the data out of the crypto stream.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)

            'Convert the byte array back into a string.
            roundtrip = textConverter.GetString(fromEncrypt)

            'Display the original data and the decrypted data.
            Console.WriteLine("Original:   {0}", original)
            Console.WriteLine("Round Trip: {0}", roundtrip)
        End Sub 'Main
    End Class 'MyMainClass
End Namespace 'RijndaelManaged_Examples

C#

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

namespace RijndaelManaged_Examples
{
    class MyMainClass
    {
        public static void
 Main()
        {
            string original = "This is a much longer string
 of data than a public/private key algorithm
 will accept.";
            string roundtrip;
            ASCIIEncoding textConverter = new ASCIIEncoding();
            RijndaelManaged myRijndael = new RijndaelManaged();
            byte[] fromEncrypt;
            byte[] encrypted;
            byte[] toEncrypt;
            byte[] key;
            byte[] IV;

            //Create a new key and initialization vector.
            myRijndael.GenerateKey();
            myRijndael.GenerateIV();

            //Get the key and IV.
            key = myRijndael.Key;
            IV = myRijndael.IV;

            //Get an encryptor.
            ICryptoTransform encryptor = myRijndael.CreateEncryptor(key, IV);
            
            //Encrypt the data.
            MemoryStream msEncrypt = new MemoryStream();
            CryptoStream csEncrypt = new CryptoStream(msEncrypt,
 encryptor, CryptoStreamMode.Write);

            //Convert the data to a byte array.
            toEncrypt = textConverter.GetBytes(original);

            //Write all data to the crypto stream and flush it.
            csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
            csEncrypt.FlushFinalBlock();

            //Get encrypted array of bytes.
            encrypted = msEncrypt.ToArray();

            //This is where the message would be transmitted to a recipient
            // who already knows your secret key. Optionally, you can
            // also encrypt your secret key using a public key algorithm
            // and pass it to the mesage recipient along with the RijnDael
            // encrypted message.            

            //Get a decryptor that uses the same key and IV as the encryptor.
            ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, IV);

            //Now decrypt the previously encrypted message using the
 decryptor
            // obtained in the above step.
            MemoryStream msDecrypt = new MemoryStream(encrypted);
            CryptoStream csDecrypt = new CryptoStream(msDecrypt,
 decryptor, CryptoStreamMode.Read);

            fromEncrypt = new byte[encrypted.Length];

            //Read the data out of the crypto stream.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);

            //Convert the byte array back into a string.
            roundtrip = textConverter.GetString(fromEncrypt);

            //Display the original data and the decrypted data.
            Console.WriteLine("Original:   {0}", original);
            Console.WriteLine("Round Trip: {0}", roundtrip);
        }
    }
}

C++

#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Text;
using namespace System::Security::Cryptography;
int main()
{
   String^ original = "This is a much longer string of data
 than a public/private key algorithm will
 accept.";
   String^ roundtrip;
   ASCIIEncoding^ textConverter = gcnew ASCIIEncoding;
   RijndaelManaged^ myRijndael = gcnew RijndaelManaged;
   array<Byte>^fromEncrypt;
   array<Byte>^encrypted;
   array<Byte>^toEncrypt;
   array<Byte>^key;
   array<Byte>^IV;
   
   //Create a new key and initialization vector.
   myRijndael->GenerateKey();
   myRijndael->GenerateIV();
   
   //Get the key and IV.
   key = myRijndael->Key;
   IV = myRijndael->IV;
   
   //Get an encryptor.
   ICryptoTransform^ encryptor = myRijndael->CreateEncryptor( key, IV );
   
   //Encrypt the data.
   MemoryStream^ msEncrypt = gcnew MemoryStream;
   CryptoStream^ csEncrypt = gcnew CryptoStream( msEncrypt,encryptor,CryptoStreamMode::Write
 );
   
   //Convert the data to a Byte array.
   toEncrypt = textConverter->GetBytes( original );
   
   //Write all data to the crypto stream and flush it.
   csEncrypt->Write( toEncrypt, 0, toEncrypt->Length );
   csEncrypt->FlushFinalBlock();
   
   //Get encrypted array of bytes.
   encrypted = msEncrypt->ToArray();
   
   //This is where the message would be transmitted to a recipient
   // who already knows your secret key. Optionally, you can
   // also encrypt your secret key using a public key algorithm
   // and pass it to the mesage recipient along with the RijnDael
   // encrypted message.            
   //Get a decryptor that uses the same key and IV as the encryptor.
   ICryptoTransform^ decryptor = myRijndael->CreateDecryptor( key, IV );
   
   //Now decrypt the previously encrypted message using the decryptor
   // obtained in the above step.
   MemoryStream^ msDecrypt = gcnew MemoryStream( encrypted );
   CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,decryptor,CryptoStreamMode::Read
 );
   fromEncrypt = gcnew array<Byte>(encrypted->Length);
   
   //Read the data out of the crypto stream.
   csDecrypt->Read( fromEncrypt, 0, fromEncrypt->Length );
   
   //Convert the Byte array back into a String*.
   roundtrip = textConverter->GetString( fromEncrypt );
   
   //Display the original data and the decrypted data.
   Console::WriteLine( "Original:   {0}", original );
   Console::WriteLine( "Round Trip: {0}", roundtrip );
}

J#

package RijndaelManaged_Examples; 

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

class MyMainClass
{
    public static void main(String[]
 args)
    {      
        String original = "This is a much longer string of
 data than a "
            + "public/private key algorithm
 will accept.";
        String roundTrip;
        ASCIIEncoding textConverter = new ASCIIEncoding();
        RijndaelManaged myRijndael = new RijndaelManaged();
        ubyte fromEncrypt[];
        ubyte encrypted[];
        ubyte toEncrypt[];
        ubyte key[];
        ubyte iv[];
        //Create a new key and initialization vector.
        myRijndael.GenerateKey();
        myRijndael.GenerateIV();
        //Get the key and iv.
        key = myRijndael.get_Key();
        iv = myRijndael.get_IV();
        //Get an encryptor.
        ICryptoTransform encryptor = myRijndael.CreateEncryptor(key, iv);
        //Encrypt the data.
        MemoryStream msEncrypt = new MemoryStream();
        CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor,
 
            CryptoStreamMode.Write);
        //Convert the data to a byte array.
        toEncrypt = textConverter.GetBytes(original);
        //Write all data to the crypto stream and flush it.
        csEncrypt.Write(toEncrypt, 0, toEncrypt.get_Length());
        csEncrypt.FlushFinalBlock();
        //Get encrypted array of bytes.
        encrypted = msEncrypt.ToArray();
        //This is where the message would be transmitted to a recipient
        // who already knows your secret key. Optionally, you can
        // also encrypt your secret key using a public key algorithm
        // and pass it to the mesage recipient along with the RijnDael
        // encrypted message.            
        //Get a decryptor that uses the same key and iv as the encryptor.
        ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, iv);
        //Now decrypt the previously encrypted message using the decryptor
        // obtained in the above step.
        MemoryStream msDecrypt = new MemoryStream(encrypted);
        CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor
,
            CryptoStreamMode.Read);
        fromEncrypt = new ubyte[encrypted.get_Length()];
        //Read the data out of the crypto stream.
        csDecrypt.Read(fromEncrypt, 0, fromEncrypt.get_Length());
        //Convert the byte array back into a string.
        roundTrip = textConverter.GetString(fromEncrypt);
        //Display the original data and the decrypted data.
        Console.WriteLine("Original:   {0}", original);
        Console.WriteLine("Round Trip: {0}", roundTrip);
    } //main
} //MyMainClass

プラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0

参照

関連項目
RijndaelManaged クラス
RijndaelManaged メンバ
System.Security.Cryptography 名前空間
その他の技術情報
暗号サービス