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vb.net how to verify signature made by signdata

Posted on 2010-09-20
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Last Modified: 2012-06-21
Dim sign As Byte() = privatekey.SignData(data, "SHA1")

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Question by:rflorencio
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Jaime Olivares earned 2000 total points
ID: 33722006
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by:rflorencio
ID: 33724423
In this function:
- datatoverify - is data before signed ?
- signeddata - is data after signed
- key - is the public or private key

Function VerifySignedHash(ByVal DataToVerify() As Byte, ByVal SignedData() As Byte, ByVal Key As RSAParameters) As Boolean
        Try
            ' Create a new instance of RSACryptoServiceProvider using the
            ' key from RSAParameters.
            Dim RSAalg As New RSACryptoServiceProvider

            RSAalg.ImportParameters(Key)

            ' Verify the data using the signature.  Pass a new instance of SHA1CryptoServiceProvider
            ' to specify the use of SHA1 for hashing.
            Return RSAalg.VerifyData(DataToVerify, New SHA1CryptoServiceProvider, SignedData)

        Catch e As CryptographicException
            Console.WriteLine(e.Message)

            Return False
        End Try
    End Function
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