(DataFlex) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoSbEccJwk
    Boolean iSuccess
    Variant vEccKey
    Handle hoEccKey
    Boolean iSuccess
ProtHdr    Handle hoJwsProtHdr
    Variant vJwsUnprotHdr
    Handle hoJwsUnprotHdr
    Handle hoJws
    Boolean iBIncludeBom
    String sPayloadStr
    String sJwsStr
    Handle hoJson
    String sTemp1
    Boolean bTemp1

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Note: This example requires Chilkat v9.5.0.66 or greater.

    // The JWS to be created will contain one signature using an ECDSA key.

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbEccJwk
    If (Not(IsComObjectCreated(hoSbEccJwk))) Begin
        Send CreateComObject of hoSbEccJwk
    End
    Get ComAppend Of hoSbEccJwk '{"kty":"EC",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"crv":"P-256",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"d":"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI"' To iSuccess
    Get ComAppend Of hoSbEccJwk "}" To iSuccess

    Get Create (RefClass(cComChilkatPrivateKey)) To hoEccKey
    If (Not(IsComObjectCreated(hoEccKey))) Begin
        Send CreateComObject of hoEccKey
    End
    // Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
    // into the private key object. (See the online reference documentation..)
    Get ComGetAsString Of hoSbEccJwk To sTemp1
    Get ComLoadJwk Of hoEccKey sTemp1 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoEccKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // ---------------------------------------------------
    // Prepare both a protected and unprotected header.

    Get Create (RefClass(cComChilkatJsonObject)) To hoJwsProtHdr
    If (Not(IsComObjectCreated(hoJwsProtHdr))) Begin
        Send CreateComObject of hoJwsProtHdr
    End
    Get ComAppendString Of hoJwsProtHdr "alg" "ES256" To iSuccess

    Get Create (RefClass(cComChilkatJsonObject)) To hoJwsUnprotHdr
    If (Not(IsComObjectCreated(hoJwsUnprotHdr))) Begin
        Send CreateComObject of hoJwsUnprotHdr
    End
    Get ComAppendString Of hoJwsUnprotHdr "kid" "myEcKey" To iSuccess

    // ---------------------------------------------------
    Get Create (RefClass(cComChilkatJws)) To hoJws
    If (Not(IsComObjectCreated(hoJws))) Begin
        Send CreateComObject of hoJws
    End

    Get pvComObject of hoJwsProtHdr to vJwsProtHdr
    Get ComSetProtectedHeader Of hoJws 0 vJwsProtHdr To iSuccess
    Get pvComObject of hoJwsUnprotHdr to vJwsUnprotHdr
    Get ComSetUnprotectedHeader Of hoJws 0 vJwsUnprotHdr To iSuccess

    Get pvComObject of hoEccKey to vEccKey
    Get ComSetPrivateKey Of hoJws 0 vEccKey To iSuccess

    Move False To iBIncludeBom
    Move "In our village, folks say God crumbles up the old moon into stars." To sPayloadStr
    Get ComSetPayload Of hoJws sPayloadStr "utf-8" iBIncludeBom To iSuccess

    // ---------------------------------------------------
    // Create the JWS.
    // Indicate we prefer the non-compact, flattened serialization.
    Set ComPreferCompact Of hoJws To False
    Set ComPreferFlattened Of hoJws To True

    Get ComCreateJws Of hoJws To sJwsStr
    Get ComLastMethodSuccess Of hoJws To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoJws To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
    // To get in human-readable format, load into a Chilkat JSON object and emit..
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComLoad Of hoJson sJwsStr To iSuccess
    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    // Sample output:

    // { 
    //   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
    //   "protected": "eyJhbGciOiJFUzI1NiJ9",
    //   "header": { 
    //     "kid": "myEcKey"
    //   },
    //   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
    // }


End_Procedure