VB.NET

Export a Public Key as DER into a BinData

Demonstrates the Chilkat PublicKey.GetDerBd method, which writes the public key as binary DER into a BinData. The first argument selects the representation (as for GetPem) and the second is the BinData that receives the bytes (its contents are replaced).

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The in-memory binary export: the raw DER lands in a BinData ready to hash, transmit, or hand to another API without a temporary file. It is the BinData counterpart to the text exporters, and the first argument picks the same PKCS #1 versus SubjectPublicKeyInfo structure.

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Dim success As Boolean = False

'  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
'  JWK, and other supported representations.
Dim pubKey As New Chilkat.PublicKey
success = pubKey.LoadFromFile("qa_data/public.pem")
If (success = False) Then
    Debug.WriteLine(pubKey.LastErrorText)
    Exit Sub
End If


'  Write the public key as binary DER into a BinData.  The 1st argument selects the representation
'  (as for GetPem) and the 2nd is the BinData that receives the bytes (its contents are replaced).
Dim preferPkcs1 As Boolean = False
Dim bd As New Chilkat.BinData
success = pubKey.GetDerBd(preferPkcs1,bd)
If (success = False) Then
    Debug.WriteLine(pubKey.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("Exported " & bd.NumBytes & " DER bytes.")