DataFlex

Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an EC private key. This is for JOSE headers having an "alg" member with any of the following values:

• BP160R1
• BP192R1
• BP224R1
• BP256R1
• BP320R1
• BP384R1
• BP512R1

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vPrivKey
    Handle hoPrivKey
    Handle hoJwt
    Handle hoJose
    Handle hoClaims
    Integer iCurDateTime
    String sToken
    String sTemp1
    String sTemp2

    Move False To iSuccess

    // Demonstrates how to create a JWT using a brainpool EC private key.

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

    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
    If (Not(IsComObjectCreated(hoPrivKey))) Begin
        Send CreateComObject of hoPrivKey
    End

    // Load a brainpool EC key.
    Get ComLoadPemFile Of hoPrivKey "c:/qa_data/pem/ec_brainpool_privKey.pem" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // You can examine the curve name of the key you just loaded by getting the private in XML format:
    // <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
    Get ComGetXml Of hoPrivKey To sTemp1
    Showln sTemp1

    Get Create (RefClass(cComChilkatJwt)) To hoJwt
    If (Not(IsComObjectCreated(hoJwt))) Begin
        Send CreateComObject of hoJwt
    End

    // Build the JOSE header
    Get Create (RefClass(cComChilkatJsonObject)) To hoJose
    If (Not(IsComObjectCreated(hoJose))) Begin
        Send CreateComObject of hoJose
    End
    // Use the brainpool curve name matching the private key you just loaded.
    // Use "BP256R1", or "BP384R1", etc.   
    Get ComAppendString Of hoJose "alg" "BP256R1" To iSuccess
    Get ComAppendString Of hoJose "typ" "JWT" To iSuccess

    // Now build the JWT claims (also known as the payload)
    Get Create (RefClass(cComChilkatJsonObject)) To hoClaims
    If (Not(IsComObjectCreated(hoClaims))) Begin
        Send CreateComObject of hoClaims
    End
    Get ComAppendString Of hoClaims "iss" "http://example.org" To iSuccess
    Get ComAppendString Of hoClaims "sub" "John" To iSuccess
    Get ComAppendString Of hoClaims "aud" "http://example.com" To iSuccess

    // Set the timestamp of when the JWT was created to now.
    Get ComGenNumericDate Of hoJwt 0 To iCurDateTime
    Get ComAddIntAt Of hoClaims -1 "iat" iCurDateTime To iSuccess

    // Set the "not process before" timestamp to now.
    Get ComAddIntAt Of hoClaims -1 "nbf" iCurDateTime To iSuccess

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    Get ComAddIntAt Of hoClaims -1 "exp" (iCurDateTime + 3600) To iSuccess

    // Produce the smallest possible JWT:
    Set ComAutoCompact Of hoJwt To True

    // Create the JWT token.  This is where the ECC signature is created.
    Get ComEmit Of hoJose To sTemp1
    Get ComEmit Of hoClaims To sTemp2
    Get pvComObject of hoPrivKey to vPrivKey
    Get ComCreateJwtPk Of hoJwt sTemp1 sTemp2 vPrivKey To sToken

    Showln sToken


End_Procedure