feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/@simplewebauthn/server/script/helpers/convertCOSEtoPKCS.js

@@ -0,0 +1,24 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.convertCOSEtoPKCS = convertCOSEtoPKCS;
+const index_js_1 = require("./iso/index.js");
+const cose_js_1 = require("./cose.js");
+/**
+ * Takes COSE-encoded public key and converts it to PKCS key
+ */
+function convertCOSEtoPKCS(cosePublicKey) {
+    // This is a little sloppy, I'm using COSEPublicKeyEC2 since it could have both x and y, but when
+    // there's no y it means it's probably better typed as COSEPublicKeyOKP. I'll leave this for now
+    // and revisit it later if it ever becomes an actual problem.
+    const struct = index_js_1.isoCBOR.decodeFirst(cosePublicKey);
+    const tag = Uint8Array.from([0x04]);
+    const x = struct.get(cose_js_1.COSEKEYS.x);
+    const y = struct.get(cose_js_1.COSEKEYS.y);
+    if (!x) {
+        throw new Error('COSE public key was missing x');
+    }
+    if (y) {
+        return index_js_1.isoUint8Array.concat([tag, x, y]);
+    }
+    return index_js_1.isoUint8Array.concat([tag, x]);
+}