PureBasic

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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IncludeFile "CkStringBuilder.pb"
IncludeFile "CkPrivateKey.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  Load a private key to export.
    privKey.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadPemFile(privKey,"qa_data/private.pem")
    If success = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    ;  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.
    sbPublic.i = CkStringBuilder::ckCreate()
    If sbPublic.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    privHex.s = CkPrivateKey::ckGetRawHex(privKey,sbPublic)
    If CkPrivateKey::ckLastMethodSuccess(privKey) = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkPrivateKey::ckDispose(privKey)
        CkStringBuilder::ckDispose(sbPublic)
        ProcedureReturn
    EndIf

    Debug "Raw private value: " + privHex
    Debug "Raw public key: " + CkStringBuilder::ckGetAsString(sbPublic)


    CkPrivateKey::ckDispose(privKey)
    CkStringBuilder::ckDispose(sbPublic)


    ProcedureReturn
EndProcedure