RSAPKCS1SignatureDeformatter.VerifySignature(Byte[], Byte[]) Метод

Определение

Пространство имен:

System.Security.Cryptography

Сборка:

System.Security.Cryptography.dll

Исходный код:

RSAPKCS1SignatureDeformatter.cs

Проверяет подпись PKCS #1 RSA для указанных данных.

public:
 override bool VerifySignature(cli::array <System::Byte> ^ rgbHash, cli::array <System::Byte> ^ rgbSignature);

public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature);

override this.VerifySignature : byte[] * byte[] -> bool

Public Overrides Function VerifySignature (rgbHash As Byte(), rgbSignature As Byte()) As Boolean

Параметры

rgbHash

Byte[]

Данные, подписанные с помощью rgbSignature.

rgbSignature

Byte[]

Подпись, которую требуется проверить с использованием rgbHash.

Возвращаемое значение

Boolean

Значение true, если rgbSignature совпадает с подписью, вычисленной с помощью указанного хэш-алгоритма и ключа для rgbHash; в противном случае — значение false.

Исключения

CryptographicUnexpectedOperationException

Ключ — null.

-или-

Хэш-алгоритм имеет значение null.

ArgumentNullException

Параметр rgbHash имеет значение null.

-или-

Параметр rgbSignature имеет значение null.

Примеры

В следующем примере показано, как использовать VerifySignature метод для проверки подписи.

using System;
using System.Security.Cryptography;

class RSASample
{

    static void Main()
    {
        try
        {
            //Create a new instance of RSA.
            using (RSA rsa = RSA.Create())
            {
                //The hash to sign.
                byte[] hash;
                using (SHA256 sha256 = SHA256.Create())
                {
                    byte[] data = new byte[] { 59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213, 134, 130, 135 };
                    hash = sha256.ComputeHash(data);
                }

                //Create an RSASignatureFormatter object and pass it the 
                //RSA instance to transfer the key information.
                RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(rsa);

                //Set the hash algorithm to SHA256.
                RSAFormatter.SetHashAlgorithm("SHA256");

                //Create a signature for HashValue and return it.
                byte[] signedHash = RSAFormatter.CreateSignature(hash);
                //Create an RSAPKCS1SignatureDeformatter object and pass it the  
                //RSA instance to transfer the key information.
                RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(rsa);
                RSADeformatter.SetHashAlgorithm("SHA256");
                //Verify the hash and display the results to the console. 
                if (RSADeformatter.VerifySignature(hash, signedHash))
                {
                    Console.WriteLine("The signature was verified.");
                }
                else
                {
                    Console.WriteLine("The signature was not verified.");
                }
            }
        }
        catch (CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

Imports System.Security.Cryptography

Friend Class RSASample

    Shared Sub Main()
        Try
            'Create a new instance of RSA.
            Using rsa As RSA = RSA.Create()
                'The hash to sign.
                Dim hash() As Byte
                Using sha256 As SHA256 = SHA256.Create()
                    Dim data() As Byte = { 59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213, 134, 130, 135 }
                    hash = sha256.ComputeHash(data)
                End Using

                'Create an RSASignatureFormatter object and pass it the 
                'RSA instance to transfer the key information.
                Dim RSAFormatter As New RSAPKCS1SignatureFormatter(rsa)

                'Set the hash algorithm to SHA256.
                RSAFormatter.SetHashAlgorithm("SHA256")

                'Create a signature for HashValue and return it.
                Dim signedHash() As Byte = RSAFormatter.CreateSignature(hash)
                'Create an RSAPKCS1SignatureDeformatter object and pass it the  
                'RSA instance to transfer the key information.
                Dim RSADeformatter As New RSAPKCS1SignatureDeformatter(rsa)
                RSADeformatter.SetHashAlgorithm("SHA256")
                'Verify the hash and display the results to the console. 
                If RSADeformatter.VerifySignature(hash, signedHash) Then
                    Console.WriteLine("The signature was verified.")
                Else
                    Console.WriteLine("The signature was not verified.")
                End If
            End Using

        Catch e As CryptographicException
            Console.WriteLine(e.Message)
        End Try
    End Sub

End Class

Комментарии

Перед вызовом этого метода необходимо указать ключ и хэш-алгоритм.

См. также раздел

• службы шифрования