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