Lax JWK Decoding Issue

[madaster97]

Lax JWK Decoding Issue

[kjur]

Hi @madaster97 , I got the issue.
The n of wrong form has leading zero for two's supplement.

AKLMe2qRcXdeqt...
=>
00a2cc7b6a9171775... (in hexadecimal)

osx7apFxd16q1gSIDkK...
=>
  a2cc7b6a9171775...

I'll fix the issue.

[madaster97]

For reference, here's the script I used to convert the "wrong" form of the public key into the right form, using JOSE v4.11.1:

const jose = require('jose');
(async () => {
    const key = await jose.importJWK({
        "kty": "RSA",
        "e": "AQAB",
        "use": "sig",
        "kid": "jwk-rsa",
        "n": "AKLMe2qRcXdeqtYEiA5Cv64eA3TOI_eoZbwoyl20E-skY4gCExE3BBugEdyFaKiopGVczSIQJwlzI2-mJYwMBz8iDsAx913E2it84LjTELP-9D5F1N9R50eH76raBq0SxfIx-vL0mVFX7o9A6032lnwMLI3Dhj2HxGD7ZVvaj7l2mypPA2zad6JkcS6XSugI-lXxWtTHln4FxtvG7kjEpBQtjZXcsJgU-wsxdxPRIxCtm0aznSogjHgrtSuD4nsN6OAiWz154JUCq0WcB6VBMR-LaH68iSWpAjyv4sMvEVXkOOr-vqXMAhsYedKWF2496bHUhDtGMqILqprqbed3Rz0="
    }, "RS256");
    const pub = await jose.exportSPKI(key);
    console.log(pub);

    const jwkPub = await jose.exportJWK(key);
    console.log(JSON.stringify(jwkPub,null,2));
})();