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(VBScript) Verify JWT Using an RSA Public Key (RS256, RS384, RS512)

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

This example verifies the RSA 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.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

'  Demonstrates how to verify an JWT using an RSA public key.

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

set pubKey = CreateObject("Chilkat_9_5_0.PublicKey")
success = pubKey.LoadFromFile("qa_data/pem/rsa_public.pem")

set jwt = CreateObject("Chilkat_9_5_0.Jwt")

token = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDYzNDQ1MjM4LCJuYmYiOjE0NjM0NDUyMzgsImV4cCI6MTQ2MzQ0ODgzOH0.XRtqed6nuJ9lrp0wbNdDX3fCkSh_d9cHAniPbNcqm7G-5N3mtI5ntQvZBDP3pHtECVqufuDwW7XgUtzAi0ZXhyiRm1iZ3wMSN5lHWv52OQJmMHPA7VPd8Q1hDG-tx-QswzJKd75OEUHP7wIXq2Mg_YVElfDvJI6TGjGyS1y-RLHlz-ldlGsEwIBkO0PtzIYTVov97x8p9KCsPNhS4lZUIqKOYoTZUV5LpuAWARl-636DfMEB_A5_IEaw_W8leh2suP2ULVZxwE-Tk1kBC9tsSGrBrPTtg7sziaV4Lbb0JRANmh98uTRu5f8ji9CVOnpbMiAzjsJSy56kz_olweXSuA"

'  First verify the signature.
sigVerified = jwt.VerifyJwtPk(token,pubKey)
outFile.WriteLine("verified: " & 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.
leeway = 60
bTimeValid = jwt.IsTimeValid(token,leeway)
outFile.WriteLine("time constraints valid: " & bTimeValid)

'  Now let's recover the original claims JSON (the payload).
payload = jwt.GetPayload(token)
'  The payload will likely be in compact form:
outFile.WriteLine(payload)

'  We can format for human viewing by loading it into Chilkat's JSON object
'  and emit.
set json = CreateObject("Chilkat_9_5_0.JsonObject")
success = json.Load(payload)
json.EmitCompact = 0
outFile.WriteLine(json.Emit())

'  We can recover the original JOSE header in the same way:
joseHeader = jwt.GetHeader(token)
'  The payload will likely be in compact form:
outFile.WriteLine(joseHeader)

'  We can format for human viewing by loading it into Chilkat's JSON object
'  and emit.
success = json.Load(joseHeader)
json.EmitCompact = 0
outFile.WriteLine(json.Emit())

outFile.Close

 

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