feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/@simplewebauthn/server/esm/metadata/verifyJWT.js

@@ -0,0 +1,37 @@
+import { convertX509PublicKeyToCOSE } from '../helpers/convertX509PublicKeyToCOSE.js';
+import { isoBase64URL, isoUint8Array } from '../helpers/iso/index.js';
+import { COSEALG, COSEKEYS, isCOSEPublicKeyEC2, isCOSEPublicKeyRSA } from '../helpers/cose.js';
+import { verifyEC2 } from '../helpers/iso/isoCrypto/verifyEC2.js';
+import { verifyRSA } from '../helpers/iso/isoCrypto/verifyRSA.js';
+/**
+ * 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, leafCert) {
+    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`);
+}