Validate a JWS Signature

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.Validate, which validates exactly one signature, identified by a zero-based index, using the key configured at that same index.

bool success = false;

Chilkat.Jws jws = new Chilkat.Jws();

//  Load the JWS compact serialization.
string jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>";
success = jws.LoadJws(jwsCompact);
if (success == false) {
    Debug.WriteLine(jws.LastErrorText);
    return;
}

//  Provide the key for signature 0 (here an HMAC key).
string base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
success = jws.SetMacKey(0,base64Key,"base64");
if (success == false) {
    Debug.WriteLine(jws.LastErrorText);
    return;
}

//  Validate the signature identified by the zero-based index, using the key configured at that index.
//  Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a
//  negative value on error.
int v = jws.Validate(0);
if (v < 0) {
    Debug.WriteLine(jws.LastErrorText);
    return;
}

if (v != 1) {
    Debug.WriteLine("The signature is not valid.");
    return;
}

Debug.WriteLine("The signature is valid.");