在VB.net中创建和验证PKCS#7签名

我想知道如何在VB.net中生成和验证PKCS#7签名。这些签名需要存储在一个单独的文件中，与它们正在验证的数据（例如test.dat和test.dat.sig）相对应。我在另一个问题中找到了生成签名的代码，但不知道如何验证它们

Public Sub SignFile(ByVal theFilename As String, ByVal theCertFile As String, ByVal thePassword As String, ByVal theDestination As String)
    Dim aCertificate = New X509Certificates.X509Certificate2(theCertFile, thePassword)
    Dim aByteArray = IO.File.ReadAllBytes(theFilename)
    Dim anOid = New System.Security.Cryptography.Oid("1.2.840.113549.1.7.2")
    Dim aContentInfo = New Pkcs.ContentInfo(anOid, aByteArray)
    Dim aSignedCms = New Pkcs.SignedCms(aContentInfo, True)
    Dim aCmsSigner = New Pkcs.CmsSigner(Pkcs.SubjectIdentifierType.IssuerAndSerialNumber, aCertificate)

    aSignedCms.ComputeSignature(aCmsSigner)
    Dim aSignature = Convert.ToBase64String(aSignedCms.Encode())
    IO.File.WriteAllText(theDestination, aSignature)
End Sub

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感谢

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