DataFlex

Export a Public Key DER as Encoded Text

Demonstrates the Chilkat PublicKey.GetEncoded method, which returns the DER representation encoded as text. The first argument selects the DER representation (as for GetPem) and the second names the binary encoding, such as base64 or hex.

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: This returns the raw DER bytes as an encoded string, so the key can travel through a text-only medium without the BEGIN/END armor of PEM. Choosing base64 versus hex is simply a matter of what the consumer expects, and the first argument selects the same DER structures as GetPem.

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Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPubKey
    Boolean iPreferPkcs1
    String sEncoded
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    //  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
    //  JWK, and other supported representations.
    Get Create (RefClass(cComChilkatPublicKey)) To hoPubKey
    If (Not(IsComObjectCreated(hoPubKey))) Begin
        Send CreateComObject of hoPubKey
    End
    Get ComLoadFromFile Of hoPubKey "qa_data/public.pem" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPubKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Export the DER as text.  The 1st argument selects the DER representation (as for GetPem) and
    //  the 2nd names the binary encoding, such as "base64" or "hex".
    Move False To iPreferPkcs1
    Get ComGetEncoded Of hoPubKey iPreferPkcs1 "base64" To sEncoded
    Get ComLastMethodSuccess Of hoPubKey To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoPubKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln sEncoded


End_Procedure