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(Mono C#) Verify JWT with EdDSA / Ed25519 SignatureNote: This example requires Chilkat v9.5.0.84 or greater. Demonstrates how to verify a JWT that was signed using an Ed25519 private key. This example verifies the EdDSA signature. It also does the following:
// Demonstrates how to verify a JWT with an EdDSA/Ed25519 Signature // *** Requires Chilkat v9.5.0.84 or greater. // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Use this Ed25519 public key for verification string jsonPubKey = "{\"kty\": \"OKP\",\"alg\": \"EdDSA\",\"crv\": \"Ed25519\",\"x\": \"11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo\"}"; Chilkat.PublicKey pubKey = new Chilkat.PublicKey(); bool success = pubKey.LoadFromString(jsonPubKey); if (success == false) { Debug.WriteLine(pubKey.LastErrorText); return; } Chilkat.Jwt jwt = new Chilkat.Jwt(); string token = "eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg"; // First verify the signature. bool sigVerified = jwt.VerifyJwtPk(token,pubKey); Debug.WriteLine("verified: " + Convert.ToString(sigVerified)); if (sigVerified == false) { Debug.WriteLine(jwt.LastErrorText); return; } // 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)); // Recover the original data (the payload). string payload = jwt.GetPayload(token); Debug.WriteLine(payload); // Recover the original JOSE header in the same way: string joseHeader = jwt.GetHeader(token); Debug.WriteLine(joseHeader); |
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