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import { convertX509PublicKeyToCOSE } from '../helpers/convertX509PublicKeyToCOSE.ts';
import { isoBase64URL, isoUint8Array } from '../helpers/iso/index.ts';
import { COSEALG, COSEKEYS, isCOSEPublicKeyEC2, isCOSEPublicKeyRSA } from '../helpers/cose.ts';
import { verifyEC2 } from '../helpers/iso/isoCrypto/verifyEC2.ts';
import { verifyRSA } from '../helpers/iso/isoCrypto/verifyRSA.ts';
/**
* Lightweight verification for FIDO MDS JWTs. Supports use of EC2 and RSA.
*
* If this ever needs to support more JWS algorithms, here's the list of them:
*
* https://www.rfc-editor.org/rfc/rfc7518.html#section-3.1
*
* (Pulled from https://www.rfc-editor.org/rfc/rfc7515#section-4.1.1)
*/
export function verifyJWT(jwt: string, leafCert: Uint8Array): Promise<boolean> {
const [header, payload, signature] = jwt.split('.');
const certCOSE = convertX509PublicKeyToCOSE(leafCert);
const data = isoUint8Array.fromUTF8String(`${header}.${payload}`);
const signatureBytes = isoBase64URL.toBuffer(signature);
if (isCOSEPublicKeyEC2(certCOSE)) {
return verifyEC2({
data,
signature: signatureBytes,
cosePublicKey: certCOSE,
shaHashOverride: COSEALG.ES256,
});
} else if (isCOSEPublicKeyRSA(certCOSE)) {
return verifyRSA({
data,
signature: signatureBytes,
cosePublicKey: certCOSE,
});
}
const kty = certCOSE.get(COSEKEYS.kty);
throw new Error(
`JWT verification with public key of kty ${kty} is not supported by this method`,
);
}
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