DataFlex

Create JWT using Smart Card

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an RSA private key and certificate on a smart card. This is for JOSE headers with an "alg" of RS256, RS384, or RS512. When RSA is used, the private key signs (creates) the JWT, and the public key is for verification.

This example also demonstrates how to include time constraints:

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

Note: This example requires Chilkat v9.5.0.99 or later.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoJwt
    Variant vCert
    Handle hoCert
    Handle hoJose
    Handle hoClaims
    Integer iCurDateTime
    String sToken
    String sTemp1
    String sTemp2

    Move False To iSuccess

    // Demonstrates how to create a JWT using an RSA private key and certificate on a smart card.

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

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

    Get ComLoadFromSmartcard Of hoCert "" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Build the JOSE header
    Get Create (RefClass(cComChilkatJsonObject)) To hoJose
    If (Not(IsComObjectCreated(hoJose))) Begin
        Send CreateComObject of hoJose
    End
    // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    Get ComUpdateString Of hoJose "alg" "RS256" To iSuccess
    Get ComUpdateString Of hoJose "typ" "JWT" To iSuccess
    Get ComGetEncoded Of hoCert To sTemp1
    Get ComUpdateString Of hoJose "x5c[0]" sTemp1 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 ComUpdateString Of hoClaims "iss" "http://example.org" To iSuccess
    Get ComUpdateString Of hoClaims "sub" "John" To iSuccess
    Get ComUpdateString 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 ComUpdateInt Of hoClaims "iat" iCurDateTime To iSuccess

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

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

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

    // Create the JWT token.  This is where the RSA signature is created.
    Get ComEmit Of hoJose To sTemp1
    Get ComEmit Of hoClaims To sTemp2
    Get pvComObject of hoCert to vCert
    Get ComCreateJwtCert Of hoJwt sTemp1 sTemp2 vCert To sToken

    Showln sToken


End_Procedure