DataFlex

Save a Public Key as a DER File

Demonstrates the Chilkat PublicKey.SaveDerFile method, which saves the public key as binary DER. The first argument selects the representation (as for GetPem) and the second is the destination path.

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: DER is the compact binary encoding many libraries and protocols consume directly. Saving to a .der file is the choice when a consumer wants raw binary rather than Base64 PEM. The first argument picks the traditional (PKCS #1) versus modern (SubjectPublicKeyInfo) structure.

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Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPubKey
    Boolean iPreferPkcs1
    String sTemp1

    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

    //  Save the public key as binary DER.  The 1st argument selects the representation and the 2nd is
    //  the destination path.
    Move False To iPreferPkcs1
    Get ComSaveDerFile Of hoPubKey iPreferPkcs1 "qa_output/public.der" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPubKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Saved."


End_Procedure