(JavaScript) 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.
var success = false;
// 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.
var pubKey = new CkPublicKey();
success = pubKey.LoadFromFile("qa_data/pem/rsa_public.pem");
var jwt = new CkJwt();
var token = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDYzNDQ1MjM4LCJuYmYiOjE0NjM0NDUyMzgsImV4cCI6MTQ2MzQ0ODgzOH0.XRtqed6nuJ9lrp0wbNdDX3fCkSh_d9cHAniPbNcqm7G-5N3mtI5ntQvZBDP3pHtECVqufuDwW7XgUtzAi0ZXhyiRm1iZ3wMSN5lHWv52OQJmMHPA7VPd8Q1hDG-tx-QswzJKd75OEUHP7wIXq2Mg_YVElfDvJI6TGjGyS1y-RLHlz-ldlGsEwIBkO0PtzIYTVov97x8p9KCsPNhS4lZUIqKOYoTZUV5LpuAWARl-636DfMEB_A5_IEaw_W8leh2suP2ULVZxwE-Tk1kBC9tsSGrBrPTtg7sziaV4Lbb0JRANmh98uTRu5f8ji9CVOnpbMiAzjsJSy56kz_olweXSuA";
// First verify the signature.
var sigVerified = jwt.VerifyJwtPk(token,pubKey);
console.log("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.
var leeway = 60;
var bTimeValid = jwt.IsTimeValid(token,leeway);
console.log("time constraints valid: " + bTimeValid);
// Now let's recover the original claims JSON (the payload).
var payload = jwt.GetPayload(token);
// The payload will likely be in compact form:
console.log(payload);
// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
var json = new CkJsonObject();
success = json.Load(payload);
json.EmitCompact = false;
console.log(json.Emit());
// We can recover the original JOSE header in the same way:
var joseHeader = jwt.GetHeader(token);
// The payload will likely be in compact form:
console.log(joseHeader);
// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
success = json.Load(joseHeader);
json.EmitCompact = false;
console.log(json.Emit());
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