gets past code errors and now gotta verify signature (note that had to add Buffer in asn1 lib)

package-lock.json

@@ -28,6 +28,7 @@
         "@veramo/key-manager": "^5.6.0",
         "@vueuse/core": "^10.9.0",
         "@zxing/text-encoding": "^0.9.0",
+        "asn1-ber": "^1.2.2",
         "axios": "^1.6.8",
         "cbor-x": "^1.5.9",
         "class-transformer": "^0.5.1",
@@ -10347,6 +10348,11 @@
       "license": "MIT",
       "optional": true
     },
+    "node_modules/asn1-ber": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/asn1-ber/-/asn1-ber-1.2.2.tgz",
+      "integrity": "sha512-CbNem/7hxrjSiOAOOTX4iZxu+0m3jiLqlsERQwwPM1IDR/22M8IPpA1VVndCLw5KtjRYyRODbvAEIfuTogNDng=="
+    },
     "node_modules/asn1.js": {
       "version": "5.4.1",
       "license": "MIT",

package.json

@@ -30,6 +30,7 @@
     "@veramo/key-manager": "^5.6.0",
     "@vueuse/core": "^10.9.0",
     "@zxing/text-encoding": "^0.9.0",
+    "asn1-ber": "^1.2.2",
     "axios": "^1.6.8",
     "cbor-x": "^1.5.9",
     "class-transformer": "^0.5.1",

src/libs/didPeer.ts

@@ -1,11 +1,10 @@
+import asn1 from "asn1-ber";
 import { Buffer } from "buffer/";
 import { decode as cborDecode } from "cbor-x";
 import { createJWS, JWTPayload, verifyJWT } from "did-jwt";
-import { getResolver } from "@veramo/did-provider-peer";
+import { DIDResolutionResult, Resolver } from "did-resolver";
 import { bytesToMultibase } from "@veramo/utils";
 
-import { generateRandomBytes } from "@/libs/crypto";
-
 export interface JWK {
   kty: string;
   crv: string;
@@ -102,7 +101,7 @@ export function createPeerDid(publicKeyCose: Uint8Array) {
   const methodSpecificId = bytesToMultibase(
     publicKeyCose,
     "base58btc",
-    "ed25519-pub",
+    "secp256k1-pub",
   );
   return "did:peer:0" + methodSpecificId;
 }
@@ -128,18 +127,53 @@ export async function createJwt(
 async function webAuthnES256KSigner(credentialID: ArrayBuffer) {
   return async (data: string | Uint8Array) => {
     // also has clientDataJSON
-    const { signature, authenticatorData } = await generateWebAuthnSignature(
+    const { signature } = await generateWebAuthnSignature(data, credentialID);
-      data,
+
-      credentialID,
+    // This converts from the browser ArrayBuffer to a Node.js Buffer, which is a requirement for the asn1 library.
-    );
+    const signatureBuffer = Buffer.from(signature);
+    console.log("signature inside signer", signature);
+    console.log("buffer signature inside signer", signatureBuffer);
+    // Decode the DER-encoded signature to extract R and S values
+    const reader = new asn1.BerReader(signatureBuffer);
+    console.log("after reader");
+    reader.readSequence();
+    console.log("after read sequence");
+    const r = reader.readString(asn1.Ber.Integer, true);
+    console.log("after r");
+    const s = reader.readString(asn1.Ber.Integer, true);
+    console.log("after r & s");
 
-    // Combine the WebAuthn components into a single signature format as required by did-jwt
+    // Ensure R and S are 32 bytes each
-    const combinedSignature = Buffer.concat([
+    const rBuffer = Buffer.from(r);
-      Buffer.from(authenticatorData),
+    const sBuffer = Buffer.from(s);
-      Buffer.from(signature),
+    console.log("after rBuffer & sBuffer", rBuffer, sBuffer);
-    ]);
+    const rWithoutPrefix = rBuffer.length > 32 ? rBuffer.slice(1) : rBuffer;
+    const sWithoutPrefix = sBuffer.length > 32 ? sBuffer.slice(1) : sBuffer;
+    const rPadded =
+      rWithoutPrefix.length < 32
+        ? Buffer.concat([Buffer.alloc(32 - rWithoutPrefix.length), rBuffer])
+        : rWithoutPrefix;
+    const sPadded =
+      rWithoutPrefix.length < 32
+        ? Buffer.concat([Buffer.alloc(32 - sWithoutPrefix.length), sBuffer])
+        : sWithoutPrefix;
+
+    // Concatenate R and S to form the 64-byte array (ECDSA signature format expected by JWT)
+    const combinedSignature = Buffer.concat([rPadded, sPadded]);
+    console.log(
+      "combinedSignature",
+      combinedSignature.length,
+      combinedSignature,
+    );
 
-    return combinedSignature.toString("base64");
+    const combSig64 = combinedSignature.toString("base64");
+    console.log("combSig64", combSig64);
+    const combSig64Url = combSig64
+      .replace(/\+/g, "-")
+      .replace(/\//g, "_")
+      .replace(/=+$/, "");
+    console.log("combSig64Url", combSig64Url);
+    return combSig64Url;
   };
 }
 
@@ -150,17 +184,25 @@ async function generateWebAuthnSignature(
   if (!(dataToSign instanceof Uint8Array)) {
     dataToSign = new TextEncoder().encode(dataToSign as string);
   }
-  const challenge = generateRandomBytes(32);
 
   const options = {
-    challenge: challenge,
+    challenge: dataToSign,
     allowCredentials: [{ id: credentialId, type: "public-key" }],
     userVerification: "preferred",
   };
 
   const assertion = await navigator.credentials.get({ publicKey: options });
+  console.log("assertion", assertion);
 
   const authenticatorAssertionResponse = assertion?.response;
+  console.log(
+    "clientDataJSON decoded",
+    JSON.parse(
+      new TextDecoder("utf-8").decode(
+        authenticatorAssertionResponse.clientDataJSON,
+      ),
+    ),
+  );
   return {
     signature: authenticatorAssertionResponse.signature,
     clientDataJSON: authenticatorAssertionResponse.clientDataJSON,
@@ -170,15 +212,55 @@ async function generateWebAuthnSignature(
 
 export async function verifyJwt(
   jwt: string,
-  issuerDid: string,
+  issuerDid: string, // eslint-disable-line @typescript-eslint/no-unused-vars
-  publicKey: JWK,
+  publicKey: JWK, // eslint-disable-line @typescript-eslint/no-unused-vars
 ) {
   const decoded = verifyJWT(jwt, {
-    didAuthenticator: {
+    // didAuthenticator: {
-      authenticators: [{ publicKeyJwk: publicKey }],
+    //   authenticators: [{ publicKeyJwk: publicKey }],
-      issuer: issuerDid,
+    //   issuer: issuerDid,
-    },
+    // },
-    resolver: getResolver(),
+    //resolver: new Resolver({ ...getResolver() }),
+    resolver: new Resolver({ peer: peerDidToDidDocument }),
   });
   return decoded;
 }
+
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+async function peerDidToDidDocument(did: string): Promise<DIDResolutionResult> {
+  if (!did.startsWith("did:peer:0z")) {
+    throw new Error(
+      "This only verifies a peer DID method 0 base58btc encoded.",
+    );
+  }
+  // this is basically hard-coded based on the results from the @aviarytech/did-peer resolver
+  const id = did.split(":")[2];
+  const multibase = id.slice(1);
+  const encnumbasis = multibase.slice(1);
+  const didDocument = {
+    "@context": [
+      "https://www.w3.org/ns/did/v1",
+      "https://w3id.org/security/suites/jws-2020/v1",
+    ],
+    assertionMethod: ["did:peer:" + id + "#" + encnumbasis],
+    authentication: ["did:peer:" + id + "#" + encnumbasis],
+    capabilityDelegation: ["did:peer:" + id + "#" + encnumbasis],
+    capabilityInvocation: ["did:peer:" + id + "#" + encnumbasis],
+    id: did,
+    keyAgreement: undefined,
+    service: undefined,
+    verificationMethod: [
+      {
+        id: "did:peer:" + id + "#" + encnumbasis,
+        type: "EcdsaSecp256k1VerificationKey2019",
+        controller: did,
+        publicKeyMultibase: multibase,
+      },
+    ],
+  };
+  return {
+    didDocument,
+    didDocumentMetadata: {},
+    didResolutionMetadata: { contentType: "application/did+ld+json" },
+  };
+}