(JavaScript) Verify JWT with EdDSA / Ed25519 Signature
Note: 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:
- Checks to see if the time constraints ("nbf" and "exp") are valid.
- Recovers the original JOSE header.
- Recovers the original data.
var success = false;
// 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
var jsonPubKey = "{\"kty\": \"OKP\",\"alg\": \"EdDSA\",\"crv\": \"Ed25519\",\"x\": \"11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo\"}";
var pubKey = new CkPublicKey();
success = pubKey.LoadFromString(jsonPubKey);
if (success == false) {
console.log(pubKey.LastErrorText);
return;
}
var jwt = new CkJwt();
var token = "eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg";
// First verify the signature.
var sigVerified = jwt.VerifyJwtPk(token,pubKey);
console.log("verified: " + sigVerified);
if (sigVerified == false) {
console.log(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.
var leeway = 60;
var bTimeValid = jwt.IsTimeValid(token,leeway);
console.log("time constraints valid: " + bTimeValid);
// Recover the original data (the payload).
var payload = jwt.GetPayload(token);
console.log(payload);
// Recover the original JOSE header in the same way:
var joseHeader = jwt.GetHeader(token);
console.log(joseHeader);
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