PowerBuilder

Verify JWT Using an ECC Public Key (ES256, ES384, ES512)

See more JSON Web Token (JWT) Examples

Demonstrates how to verify a JWT that was signed using an ECC private key.

This example verifies the ECC signature. It also does the following:

• Checks to see if the time constraints ("nbf" and "exp") are valid.
• Recovers the original JOSE header.
• Recovers the original claims JSON.

PowerBuilder

integer li_rc
long li_Success
oleobject loo_PubKey
oleobject loo_Jwt
string ls_Token
long li_SigVerified
long li_Leeway
long li_BTimeValid
string ls_Payload
oleobject loo_Json
string ls_JoseHeader

li_Success = 0

//  Demonstrates how to verify an JWT using an ECC public key.

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

loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")
if li_rc < 0 then
    destroy loo_PubKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_PubKey.LoadFromFile("qa_data/pem/ecc_public.pem")

loo_Jwt = create oleobject
li_rc = loo_Jwt.ConnectToNewObject("Chilkat.Jwt")

ls_Token = "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q"

//  First verify the signature.
li_SigVerified = loo_Jwt.VerifyJwtPk(ls_Token,loo_PubKey)
Write-Debug "verified: " + string(li_SigVerified)

//  Let's see if the time constraints, if any, are valid.
//  The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
//  If the current system time is before the "nbf" time, or after the "exp" time,
//  then IsTimeValid will return false/0.
//  Also, we'll allow a leeway of 60 seconds to account for any clock skew.
//  Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
li_Leeway = 60
li_BTimeValid = loo_Jwt.IsTimeValid(ls_Token,li_Leeway)
Write-Debug "time constraints valid: " + string(li_BTimeValid)

//  Now let's recover the original claims JSON (the payload).
ls_Payload = loo_Jwt.GetPayload(ls_Token)
//  The payload will likely be in compact form:
Write-Debug ls_Payload

//  We can format for human viewing by loading it into Chilkat's JSON object
//  and emit.
loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

li_Success = loo_Json.Load(ls_Payload)
loo_Json.EmitCompact = 0
Write-Debug loo_Json.Emit()

//  We can recover the original JOSE header in the same way:
ls_JoseHeader = loo_Jwt.GetHeader(ls_Token)
//  The payload will likely be in compact form:
Write-Debug ls_JoseHeader

//  We can format for human viewing by loading it into Chilkat's JSON object
//  and emit.
li_Success = loo_Json.Load(ls_JoseHeader)
loo_Json.EmitCompact = 0
Write-Debug loo_Json.Emit()


destroy loo_PubKey
destroy loo_Jwt
destroy loo_Json