(Lianja) 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

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// 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("CkPrivateKey")

// Load a brainpool EC key.
llSuccess = loPrivKey.LoadPemFile("c:/qa_data/pem/ec_brainpool_privKey.pem")
if (llSuccess <> .T.) then
    ? loPrivKey.LastErrorText
    release loPrivKey
    return
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("CkJwt")

// Build the JOSE header
loJose = createobject("CkJsonObject")
// Use the brainpool curve name matching the private key you just loaded.
// Use "BP256R1", or "BP384R1", etc.   
llSuccess = loJose.AppendString("alg","BP256R1")
llSuccess = loJose.AppendString("typ","JWT")

// Now build the JWT claims (also known as the payload)
loClaims = createobject("CkJsonObject")
llSuccess = loClaims.AppendString("iss","http://example.org")
llSuccess = loClaims.AppendString("sub","John")
llSuccess = loClaims.AppendString("aud","http://example.com")

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

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

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

// Produce the smallest possible JWT:
loJwt.AutoCompact = .T.

// 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