DataFlex

Get a Private Key's Raw Hex Value

Demonstrates the Chilkat PrivateKey.GetRawHex method, which returns the raw private value as lowercase hexadecimal and replaces the contents of the supplied StringBuilder with the corresponding raw public key.

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 drops below the structured container formats to the bare key bytes as hex, which is meaningful chiefly for fixed-size keys such as EC and Ed25519 where a key is essentially a fixed byte string. It is the export to use when another system wants raw values rather than PEM or JWK — the counterpart to LoadEd25519. Both the returned private hex and the public value are produced in one call.

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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPrivKey
    Variant vSbPublic
    Handle hoSbPublic
    String sPrivHex
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    //  Load a private key to export.
    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
    If (Not(IsComObjectCreated(hoPrivKey))) Begin
        Send CreateComObject of hoPrivKey
    End
    Get ComLoadPemFile Of hoPrivKey "qa_data/private.pem" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  GetRawHex returns the raw private value as lowercase hex, and replaces the contents of the
    //  StringBuilder argument with the corresponding raw public key.  This is most meaningful for
    //  fixed-size keys such as EC and Ed25519.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbPublic
    If (Not(IsComObjectCreated(hoSbPublic))) Begin
        Send CreateComObject of hoSbPublic
    End
    Get pvComObject of hoSbPublic to vSbPublic
    Get ComGetRawHex Of hoPrivKey vSbPublic To sPrivHex
    Get ComLastMethodSuccess Of hoPrivKey To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Raw private value: " sPrivHex
    Get ComGetAsString Of hoSbPublic To sTemp1
    Showln "Raw public key: " sTemp1


End_Procedure