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