RSACryptoServiceProvider.SignHash メソッドとは？ わかりやすく解説

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RSACryptoServiceProvider.SignHash メソッド

指定したハッシュ値を秘密キーで暗号化することにより、そのハッシュ値の署名を計算します。

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

Visual Basic (宣言)
Public Function SignHash ( _
    rgbHash As Byte(), _
    str As String _
) As Byte()
Visual Basic (使用法)
Dim instance As RSACryptoServiceProvider
Dim rgbHash As Byte()
Dim str As String
Dim returnValue As Byte()

returnValue = instance.SignHash(rgbHash, str)
C#
public byte[] SignHash (
    byte[] rgbHash,
    string str
)
C++
public:
array<unsigned char>^ SignHash (
    array<unsigned char>^ rgbHash, 
    String^ str
)
J#
public byte[] SignHash (
    byte[] rgbHash, 
    String str
)
JScript
public function SignHash (
    rgbHash : byte[], 
    str : String
) : byte[]

パラメータ

rgbHash

署名されるデータのハッシュ値。

str

データのハッシュ値の作成に使用するハッシュ アルゴリズム識別子 (OID)。

戻り値
指定したハッシュ値に対する RSA 署名。

例外例外
例外の種類条件

ArgumentNullException

rgbHash パラメータが null 参照 (Visual Basic では Nothing) です。

CryptographicException

暗号サービス プロバイダ (CSP) を取得できません。

または

秘密キーがありません。

解説解説

このメソッドは、デジタル署名を作成します。作成した署名は VerifyHash メソッドを使用して検証されます。

有効なハッシュ アルゴリズムは SHA1 と MD5 です。アルゴリズム識別子は、MapNameToOID メソッドを使用して、ハッシュ名から取得できます。

使用例使用例

一部のデータを暗号化し、暗号化データのハッシュを作成して、そのハッシュにデジタル署名で署名するコード例を次に示します。

Visual Basic
Imports System
Imports System.Text
Imports System.Security.Cryptography

Namespace RSACryptoServiceProvider_Examples
    Class MyMainClass
        Shared Sub Main()
            Dim toEncrypt() As Byte
            Dim encrypted() As Byte
            Dim signature() As Byte
            'Choose a small amount of data to encrypt.
            Dim original As String
 = "Hello"
            Dim myAscii As New
 ASCIIEncoding()

            'Create a sender and receiver.
            Dim mySender As New
 Sender()
            Dim myReceiver As New
 Receiver()

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

            'Encrypt data using receiver's public key.
            encrypted = mySender.EncryptData(myReceiver.PublicParameters, toEncrypt)

            'Hash the encrypted data and generate a signature on the
 hash
            ' using the sender's private key.
            signature = mySender.HashAndSign(encrypted)

            Console.WriteLine("Original: {0}", original)

            'Verify the signature is authentic using the sender's public
 key.
            If myReceiver.VerifyHash(mySender.PublicParameters,
 encrypted, signature) Then
                'Decrypt the data using the receiver's private key.
                myReceiver.DecryptData(encrypted)
            Else
                Console.WriteLine("Invalid signature")
            End If
        End Sub 'Main
    End Class 'MyMainClass

    Class Sender
        Private rsaPubParams As RSAParameters
        Private rsaPrivateParams As RSAParameters

        Public Sub New()
            Dim rsaCSP As New
 RSACryptoServiceProvider()

            'Generate public and private key data.
            rsaPrivateParams = rsaCSP.ExportParameters(True)
            rsaPubParams = rsaCSP.ExportParameters(False)
        End Sub 'New

        Public ReadOnly Property
 PublicParameters() As RSAParameters
            Get
                Return rsaPubParams
            End Get
        End Property

        'Manually performs hash and then signs hashed value.
        Public Function HashAndSign(ByVal
 encrypted() As Byte) As
 Byte()
            Dim rsaCSP As New
 RSACryptoServiceProvider()
            Dim hash As New
 SHA1Managed()
            Dim hashedData() As Byte

            rsaCSP.ImportParameters(rsaPrivateParams)

            hashedData = hash.ComputeHash(encrypted)
            Return rsaCSP.SignHash(hashedData, CryptoConfig.MapNameToOID("SHA1"))
        End Function 'HashAndSign

        'Encrypts using only the public key data.
        Public Function EncryptData(ByVal
 rsaParams As RSAParameters, ByVal toEncrypt()
 As Byte) As Byte()
            Dim rsaCSP As New
 RSACryptoServiceProvider()

            rsaCSP.ImportParameters(rsaParams)
            Return rsaCSP.Encrypt(toEncrypt, False)
        End Function 'EncryptData
    End Class 'Sender

    Class Receiver
        Private rsaPubParams As RSAParameters
        Private rsaPrivateParams As RSAParameters

        Public Sub New()
            Dim rsaCSP As New
 RSACryptoServiceProvider()

            'Generate public and private key data.
            rsaPrivateParams = rsaCSP.ExportParameters(True)
            rsaPubParams = rsaCSP.ExportParameters(False)
        End Sub 'New

        Public ReadOnly Property
 PublicParameters() As RSAParameters
            Get
                Return rsaPubParams
            End Get
        End Property

        'Manually performs hash and then verifies hashed value.
        Public Function VerifyHash(ByVal
 rsaParams As RSAParameters, ByVal signedData()
 As Byte, ByVal signature() As Byte) As Boolean
            Dim rsaCSP As New
 RSACryptoServiceProvider()
            Dim hash As New
 SHA1Managed()
            Dim hashedData() As Byte

            rsaCSP.ImportParameters(rsaParams)

            hashedData = hash.ComputeHash(signedData)
            Return rsaCSP.VerifyHash(hashedData, CryptoConfig.MapNameToOID("SHA1"),
 signature)
        End Function 'VerifyHash

        'Decrypt using the private key data.
        Public Sub DecryptData(ByVal
 encrypted() As Byte)
            Dim fromEncrypt() As Byte
            Dim roundTrip As String
            Dim myAscii As New
 ASCIIEncoding()
            Dim rsaCSP As New
 RSACryptoServiceProvider()

            rsaCSP.ImportParameters(rsaPrivateParams)
            fromEncrypt = rsaCSP.Decrypt(encrypted, False)
            roundTrip = myAscii.GetString(fromEncrypt)

            Console.WriteLine("RoundTrip: {0}", roundTrip)
        End Sub 'DecryptData
    End Class 'Receiver
End Namespace 'RSACryptoServiceProvider_Examples
C#
using System;
using System.Text;
using System.Security.Cryptography;

namespace RSACryptoServiceProvider_Examples
{
    class MyMainClass
    {
        static void Main()
        {
            byte[] toEncrypt;
            byte[] encrypted;
            byte[] signature;
            //Choose a small amount of data to encrypt.
            string original = "Hello";
            ASCIIEncoding myAscii = new ASCIIEncoding();

            //Create a sender and receiver.
            Sender mySender = new Sender();
            Receiver myReceiver = new Receiver();

            //Convert the data string to a byte array.
            toEncrypt = myAscii.GetBytes(original);
            
            //Encrypt data using receiver's public key.
            encrypted = mySender.EncryptData(myReceiver.PublicParameters, toEncrypt);
            
            //Hash the encrypted data and generate a signature on the
 hash
            // using the sender's private key.
            signature = mySender.HashAndSign(encrypted);

            Console.WriteLine("Original: {0}", original);

            //Verify the signature is authentic using the sender's public
 key.
            if(myReceiver.VerifyHash(mySender.PublicParameters,
 encrypted, signature))
            {
                //Decrypt the data using the receiver's private key.
                myReceiver.DecryptData(encrypted);
            }
            else
            {
                Console.WriteLine("Invalid signature");
            }
        }
    }

    class Sender
    {
        RSAParameters rsaPubParams;
        RSAParameters rsaPrivateParams;

        public Sender()
        {
            RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();
            
            //Generate public and private key data.
            rsaPrivateParams = rsaCSP.ExportParameters(true);
            rsaPubParams = rsaCSP.ExportParameters(false);
        }
        
        public RSAParameters PublicParameters
        {
            get
            {
                return rsaPubParams;
            }
        }

        //Manually performs hash and then signs hashed value.
        public byte[] HashAndSign(byte[] encrypted)
        {
            RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();
            SHA1Managed hash = new SHA1Managed();
            byte[] hashedData;

            rsaCSP.ImportParameters(rsaPrivateParams);

            hashedData = hash.ComputeHash(encrypted);
            return rsaCSP.SignHash(hashedData, CryptoConfig.MapNameToOID("SHA1"));
        }

        //Encrypts using only the public key data.
        public byte[] EncryptData(RSAParameters rsaParams, byte[]
 toEncrypt)
        {
            RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

            rsaCSP.ImportParameters(rsaParams);
            return rsaCSP.Encrypt(toEncrypt, false);
        }
    }

    class Receiver
    {
        RSAParameters rsaPubParams;
        RSAParameters rsaPrivateParams;

        public Receiver()
        {
            RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();
            
            //Generate public and private key data.
            rsaPrivateParams = rsaCSP.ExportParameters(true);
            rsaPubParams = rsaCSP.ExportParameters(false);
        }

        public RSAParameters PublicParameters
        {
            get
            {
                return rsaPubParams;
            }
        }

        //Manually performs hash and then verifies hashed value.
        public bool VerifyHash(RSAParameters
 rsaParams, byte[] signedData, byte[] signature)
        {
            RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();
            SHA1Managed hash = new SHA1Managed();
            byte[] hashedData;

            rsaCSP.ImportParameters(rsaParams);

            hashedData = hash.ComputeHash(signedData);
            return rsaCSP.VerifyHash(hashedData, CryptoConfig.MapNameToOID("SHA1"),
 signature);
        }

        //Decrypt using the private key data.
        public void DecryptData(byte[] encrypted)
        {
            byte[] fromEncrypt;
            string roundTrip;
            ASCIIEncoding myAscii = new ASCIIEncoding();
            RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

            rsaCSP.ImportParameters(rsaPrivateParams);
            fromEncrypt = rsaCSP.Decrypt(encrypted, false);
            roundTrip = myAscii.GetString(fromEncrypt);

            Console.WriteLine("RoundTrip: {0}", roundTrip);
        }
    }
}
C++
#using <System.dll>

using namespace System;
using namespace System::Text;
using namespace System::Security::Cryptography;
ref class Sender
{
private:
   RSAParameters rsaPubParams;
   RSAParameters rsaPrivateParams;

public:
   Sender()
   {
      RSACryptoServiceProvider^ rsaCSP = gcnew RSACryptoServiceProvider;
      
      //Generate public and private key data.
      rsaPrivateParams = rsaCSP->ExportParameters( true );
      rsaPubParams = rsaCSP->ExportParameters( false );
   }


   property RSAParameters PublicParameters 
   {
      RSAParameters get()
      {
         return rsaPubParams;
      }

   }

   //Manually performs hash and then signs hashed value.
   array<Byte>^ HashAndSign( array<Byte>^encrypted )
   {
      RSACryptoServiceProvider^ rsaCSP = gcnew RSACryptoServiceProvider;
      SHA1Managed^ hash = gcnew SHA1Managed;
      array<Byte>^hashedData;
      rsaCSP->ImportParameters( rsaPrivateParams );
      hashedData = hash->ComputeHash( encrypted );
      return rsaCSP->SignHash( hashedData, CryptoConfig::MapNameToOID(
 "SHA1" ) );
   }


   //Encrypts using only the public key data.
   array<Byte>^ EncryptData( RSAParameters rsaParams, array<Byte>^toEncrypt
 )
   {
      RSACryptoServiceProvider^ rsaCSP = gcnew RSACryptoServiceProvider;
      rsaCSP->ImportParameters( rsaParams );
      return rsaCSP->Encrypt( toEncrypt, false
 );
   }

};

ref class Receiver
{
private:
   RSAParameters rsaPubParams;
   RSAParameters rsaPrivateParams;

public:
   Receiver()
   {
      RSACryptoServiceProvider^ rsaCSP = gcnew RSACryptoServiceProvider;
      
      //Generate public and private key data.
      rsaPrivateParams = rsaCSP->ExportParameters( true );
      rsaPubParams = rsaCSP->ExportParameters( false );
   }


   property RSAParameters PublicParameters 
   {
      RSAParameters get()
      {
         return rsaPubParams;
      }

   }

   //Manually performs hash and then verifies hashed value.
   bool VerifyHash( RSAParameters rsaParams, array<Byte>^signedData,
 array<Byte>^signature )
   {
      RSACryptoServiceProvider^ rsaCSP = gcnew RSACryptoServiceProvider;
      SHA1Managed^ hash = gcnew SHA1Managed;
      array<Byte>^hashedData;
      rsaCSP->ImportParameters( rsaParams );
      hashedData = hash->ComputeHash( signedData );
      return rsaCSP->VerifyHash( hashedData, CryptoConfig::MapNameToOID(
 "SHA1" ), signature );
   }


   //Decrypt using the private key data.
   void DecryptData( array<Byte>^encrypted )
   {
      array<Byte>^fromEncrypt;
      String^ roundTrip;
      ASCIIEncoding^ myAscii = gcnew ASCIIEncoding;
      RSACryptoServiceProvider^ rsaCSP = gcnew RSACryptoServiceProvider;
      rsaCSP->ImportParameters( rsaPrivateParams );
      fromEncrypt = rsaCSP->Decrypt( encrypted, false );
      roundTrip = myAscii->GetString( fromEncrypt );
      Console::WriteLine( "RoundTrip: {0}", roundTrip );
   }

};

int main()
{
   array<Byte>^toEncrypt;
   array<Byte>^encrypted;
   array<Byte>^signature;
   
   //Choose a small amount of data to encrypt.
   String^ original = "Hello";
   ASCIIEncoding^ myAscii = gcnew ASCIIEncoding;
   
   //Create a sender and receiver.
   Sender^ mySender = gcnew Sender;
   Receiver^ myReceiver = gcnew Receiver;
   
   //Convert the data string to a byte array.
   toEncrypt = myAscii->GetBytes( original );
   
   //Encrypt data using receiver's public key.
   encrypted = mySender->EncryptData( myReceiver->PublicParameters, toEncrypt
 );
   
   //Hash the encrypted data and generate a signature on the hash
   // using the sender's private key.
   signature = mySender->HashAndSign( encrypted );
   Console::WriteLine( "Original: {0}", original );
   
   //Verify the signature is authentic using the sender's public key.
   if ( myReceiver->VerifyHash( mySender->PublicParameters,
 encrypted, signature ) )
   {
      
      //Decrypt the data using the receiver's private key.
      myReceiver->DecryptData( encrypted );
   }
   else
   {
      Console::WriteLine( "Invalid signature" );
   }
}
J#
package RSACryptoServiceProvider_Examples; 

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

class MyMainClass
{
    public static void main(String[]
 args)
    {
        ubyte toEncrypt[];
        ubyte encrypted[];
        ubyte signature[];

        // Choose a small amount of data to encrypt.
        String original = "Hello";
        ASCIIEncoding myAscii = new ASCIIEncoding();

        // Create a sender and receiver.
        Sender mySender = new Sender();
        Receiver myReceiver = new Receiver();

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

        // Encrypt data using receiver's public key.
        encrypted = mySender.EncryptData(myReceiver.get_PublicParameters(),
            toEncrypt);

        // Hash the encrypted data and generate a signature on the hash
        // using the sender's private key.
        signature = mySender.HashAndSign(encrypted);
        Console.WriteLine("Original: {0}", original);

        // Verify the signature is authentic using the sender's public
 key.
        if (myReceiver.VerifyHash(mySender.get_PublicParameters(),
 
                encrypted, signature)) {
            // Decrypt the data using the receiver's private key.
            myReceiver.DecryptData(encrypted);
        }
        else {
            Console.WriteLine("Invalid signature");
        }
    } //main
} //MyMainClass

class Sender
{
    private RSAParameters rsaPubParams;
    private RSAParameters rsaPrivateParams;

    public Sender()
    {
        RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

        // Generate public and private key data.
        rsaPrivateParams = rsaCSP.ExportParameters(true);
        rsaPubParams = rsaCSP.ExportParameters(false);
    } //Sender

    /** @property 
     */
    public RSAParameters get_PublicParameters()
    {
        return rsaPubParams;
    } //get_PublicParameters

    // Manually performs hash and then signs hashed value.
    public ubyte[] HashAndSign(ubyte encrypted[])
    {
        RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();
        SHA1Managed hash = new SHA1Managed();
        ubyte hashedData[];

        rsaCSP.ImportParameters(rsaPrivateParams);
        hashedData = hash.ComputeHash(encrypted);
        return rsaCSP.SignHash(hashedData, CryptoConfig.MapNameToOID("SHA1"));
    } //HashAndSign

    // Encrypts using only the public key data.
    public ubyte[] EncryptData(RSAParameters rsaParams, ubyte
 toEncrypt[])
    {
        RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

        rsaCSP.ImportParameters(rsaParams);
        return rsaCSP.Encrypt(toEncrypt, false);
    } //EncryptData
} //Sender

class Receiver
{
    private RSAParameters rsaPubParams;
    private RSAParameters rsaPrivateParams;

    public Receiver()
    {
        RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

        // Generate public and private key data.
        rsaPrivateParams = rsaCSP.ExportParameters(true);
        rsaPubParams = rsaCSP.ExportParameters(false);
    } //Receiver

    /** @property 
     */
    public RSAParameters get_PublicParameters()
    {
        return rsaPubParams;
    } //get_PublicParameters
    
    // Manually performs hash and then verifies hashed value.
    public boolean VerifyHash(RSAParameters rsaParams, 
        ubyte signedData[], ubyte signature[])
    {
        RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();
        SHA1Managed hash = new SHA1Managed();
        ubyte hashedData[];

        rsaCSP.ImportParameters(rsaParams);
        hashedData = hash.ComputeHash(signedData);
        return rsaCSP.VerifyHash(hashedData, 
            CryptoConfig.MapNameToOID("SHA1"), signature);
    } //VerifyHash

    // Decrypt using the private key data.
    public void DecryptData(ubyte encrypted[])
    {
        ubyte fromEncrypt[];
        String roundTrip;
        ASCIIEncoding myAscii = new ASCIIEncoding();
        RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

        rsaCSP.ImportParameters(rsaPrivateParams);
        fromEncrypt = rsaCSP.Decrypt(encrypted, false);
        roundTrip = myAscii.GetString(fromEncrypt);

        Console.WriteLine("RoundTrip: {0}", roundTrip);
    } //DecryptData
} //Receiver
.NET Framework のセキュリティ.NET Framework のセキュリティ
プラットフォームプラットフォーム

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
参照参照
関連項目
RSACryptoServiceProvider クラス
RSACryptoServiceProvider メンバ
System.Security.Cryptography 名前空間
その他の技術情報
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Weblioのサービス

RSACryptoServiceProvider.SignHash メソッドのお隣キーワード

RSACryptoServiceProvider.ImportParameters メソッド

RSACryptoServiceProvider.KeyExchangeAlgorithm プロパティ

RSACryptoServiceProvider.KeySize プロパティ

RSACryptoServiceProvider.PersistKeyInCsp プロパティ

RSACryptoServiceProvider.PublicOnly プロパティ

RSACryptoServiceProvider.SignData メソッド

RSACryptoServiceProvider.SignHash メソッド

RSACryptoServiceProvider.SignatureAlgorithm プロパティ

RSACryptoServiceProvider.UseMachineKeyStore プロパティ

RSACryptoServiceProvider.VerifyData メソッド

RSACryptoServiceProvider.VerifyHash メソッド

RSAKeyValue.GetXml メソッド

RSAKeyValue.Key プロパティ

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