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(Mono C#) Verify JWT Using HS256, HS384, or HS512Demonstrates how to verify a JWT that was signed using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) This example verifies the signature. It also does the following:
// Demonstrates how to verify an HMAC JWT using a shared secret (password). // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Jwt jwt = new Chilkat.Jwt(); string token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDYzNDMxODEyLCJuYmYiOjE0NjM0MzE4MTIsImV4cCI6MTQ2MzQzNTQxMn0.SHnMJ11qJH5pbp22YchT_9fL2HIx0koHiUHLG67_foU"; // First verify the signature. // The password used to create this JWT was "secret". bool sigVerified = jwt.VerifyJwt(token,"secret"); Debug.WriteLine("with correct password: " + Convert.ToString(sigVerified)); // Now try with a different password: sigVerified = jwt.VerifyJwt(token,"secret2"); Debug.WriteLine("with incorrect password " + Convert.ToString(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. int leeway = 60; bool bTimeValid = jwt.IsTimeValid(token,leeway); Debug.WriteLine("time constraints valid: " + Convert.ToString(bTimeValid)); // Now let's recover the original claims JSON (the payload). string payload = jwt.GetPayload(token); // The payload will likely be in compact form: Debug.WriteLine(payload); // We can format for human viewing by loading it into Chilkat's JSON object // and emit. Chilkat.JsonObject json = new Chilkat.JsonObject(); bool success = json.Load(payload); json.EmitCompact = false; Debug.WriteLine(json.Emit()); // We can recover the original JOSE header in the same way: string joseHeader = jwt.GetHeader(token); // The payload will likely be in compact form: Debug.WriteLine(joseHeader); // We can format for human viewing by loading it into Chilkat's JSON object // and emit. success = json.Load(joseHeader); json.EmitCompact = false; Debug.WriteLine(json.Emit()); |
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