Visual FoxPro

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

Visual FoxPro

LOCAL lnSuccess
LOCAL loPrivKey
LOCAL loJwt
LOCAL loJose
LOCAL loClaims
LOCAL lnCurDateTime
LOCAL lcToken

lnSuccess = 0

* 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.

loPrivKey = CreateObject('Chilkat.PrivateKey')

* Load a brainpool EC key.
lnSuccess = loPrivKey.LoadPemFile("c:/qa_data/pem/ec_brainpool_privKey.pem")
IF (lnSuccess <> 1) THEN
    ? loPrivKey.LastErrorText
    RELEASE loPrivKey
    CANCEL
ENDIF

* You can examine the curve name of the key you just loaded by getting the private in XML format:
* <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
? loPrivKey.GetXml()

loJwt = CreateObject('Chilkat.Jwt')

* Build the JOSE header
loJose = CreateObject('Chilkat.JsonObject')
* Use the brainpool curve name matching the private key you just loaded.
* Use "BP256R1", or "BP384R1", etc.   
lnSuccess = loJose.AppendString("alg","BP256R1")
lnSuccess = loJose.AppendString("typ","JWT")

* Now build the JWT claims (also known as the payload)
loClaims = CreateObject('Chilkat.JsonObject')
lnSuccess = loClaims.AppendString("iss","http://example.org")
lnSuccess = loClaims.AppendString("sub","John")
lnSuccess = loClaims.AppendString("aud","http://example.com")

* Set the timestamp of when the JWT was created to now.
lnCurDateTime = loJwt.GenNumericDate(0)
lnSuccess = loClaims.AddIntAt(-1,"iat",lnCurDateTime)

* Set the "not process before" timestamp to now.
lnSuccess = loClaims.AddIntAt(-1,"nbf",lnCurDateTime)

* Set the timestamp defining an expiration time (end time) for the token
* to be now + 1 hour (3600 seconds)
lnSuccess = loClaims.AddIntAt(-1,"exp",lnCurDateTime + 3600)

* Produce the smallest possible JWT:
loJwt.AutoCompact = 1

* Create the JWT token.  This is where the ECC signature is created.
lcToken = loJwt.CreateJwtPk(loJose.Emit(),loClaims.Emit(),loPrivKey)

? lcToken

RELEASE loPrivKey
RELEASE loJwt
RELEASE loJose
RELEASE loClaims