move low-level DID-related create & decode into separate folder #120
Merged
trentlarson
merged 2 commits from lib-refactor into master 1 year ago
12 changed files with 287 additions and 176 deletions
@ -0,0 +1,96 @@ |
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import {Buffer} from "buffer/"; |
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import {decode as cborDecode} from "cbor-x"; |
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import {bytesToMultibase, multibaseToBytes} from "did-jwt"; |
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|
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import {getWebCrypto} from "@/libs/crypto/vc/passkeyHelpers"; |
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const PEER_DID_PREFIX = "did:peer:"; |
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const PEER_DID_MULTIBASE_PREFIX = PEER_DID_PREFIX + "0"; |
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/** |
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* |
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* |
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* similar code is in crowd-funder-for-time-pwa libs/crypto/vc/passkeyDidPeer.ts verifyJwtWebCrypto |
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* |
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* @returns {Promise<boolean>} |
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*/ |
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export async function verifyPeerSignature( |
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payloadBytes: Buffer, |
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issuerDid: string, |
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signatureBytes: Uint8Array, |
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): Promise<boolean> { |
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const publicKeyBytes = peerDidToPublicKeyBytes(issuerDid); |
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|
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const WebCrypto = await getWebCrypto(); |
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const verifyAlgorithm = { |
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name: "ECDSA", |
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hash: { name: "SHA-256" }, |
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}; |
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const publicKeyJwk = cborToKeys(publicKeyBytes).publicKeyJwk; |
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const keyAlgorithm = { |
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name: "ECDSA", |
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namedCurve: publicKeyJwk.crv, |
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}; |
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const publicKeyCryptoKey = await WebCrypto.subtle.importKey( |
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"jwk", |
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publicKeyJwk, |
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keyAlgorithm, |
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false, |
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["verify"], |
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); |
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const verified = await WebCrypto.subtle.verify( |
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verifyAlgorithm, |
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publicKeyCryptoKey, |
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signatureBytes, |
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payloadBytes, |
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); |
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return verified; |
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} |
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|
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export function cborToKeys(publicKeyBytes: Uint8Array) { |
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const jwkObj = cborDecode(publicKeyBytes); |
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if ( |
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jwkObj[1] != 2 || // kty "EC"
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jwkObj[3] != -7 || // alg "ES256"
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jwkObj[-1] != 1 || // crv "P-256"
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jwkObj[-2].length != 32 || // x
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jwkObj[-3].length != 32 // y
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) { |
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throw new Error("Unable to extract key."); |
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} |
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const publicKeyJwk = { |
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alg: "ES256", |
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crv: "P-256", |
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kty: "EC", |
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x: arrayToBase64Url(jwkObj[-2]), |
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y: arrayToBase64Url(jwkObj[-3]), |
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}; |
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const publicKeyBuffer = Buffer.concat([ |
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Buffer.from(jwkObj[-2]), |
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Buffer.from(jwkObj[-3]), |
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]); |
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return { publicKeyJwk, publicKeyBuffer }; |
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} |
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|
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export function toBase64Url(anythingB64: string) { |
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return anythingB64.replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/, ""); |
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} |
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export function arrayToBase64Url(anything: Uint8Array) { |
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return toBase64Url(Buffer.from(anything).toString("base64")); |
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} |
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|
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export function peerDidToPublicKeyBytes(did: string) { |
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return multibaseToBytes(did.substring(PEER_DID_MULTIBASE_PREFIX.length)); |
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} |
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export function createPeerDid(publicKeyBytes: Uint8Array) { |
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// https://github.com/decentralized-identity/veramo/blob/next/packages/did-provider-peer/src/peer-did-provider.ts#L67
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//const provider = new PeerDIDProvider({ defaultKms: LOCAL_KMS_NAME });
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const methodSpecificId = bytesToMultibase( |
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publicKeyBytes, |
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"base58btc", |
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"p256-pub", |
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); |
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return PEER_DID_MULTIBASE_PREFIX + methodSpecificId; |
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} |
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@ -0,0 +1,110 @@ |
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/** |
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* Verifiable Credential & DID functions, specifically for EndorserSearch.org tools |
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* |
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* The goal is to make this folder similar across projects, then move it to a library. |
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* Other projects: endorser-ch, image-api |
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* |
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*/ |
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import * as didJwt from "did-jwt"; |
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import { JWTDecoded } from "did-jwt/lib/JWT"; |
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import { IIdentifier } from "@veramo/core"; |
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import * as u8a from "uint8arrays"; |
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import { createDidPeerJwt } from "@/libs/crypto/vc/passkeyDidPeer"; |
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/** |
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* Meta info about a key |
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*/ |
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export interface KeyMeta { |
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/** |
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* Decentralized ID for the key |
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*/ |
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did: string; |
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/** |
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* Stringified IIDentifier object from Veramo |
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*/ |
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identity?: string; |
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/** |
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* The Webauthn credential ID in hex, if this is from a passkey |
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*/ |
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passkeyCredIdHex?: string; |
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} |
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|
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/** |
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* Tell whether a key is from a passkey |
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* @param keyMeta contains info about the key, whose passkeyCredIdHex determines if the key is from a passkey |
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*/ |
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export function isFromPasskey(keyMeta?: KeyMeta): boolean { |
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return !!keyMeta?.passkeyCredIdHex; |
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} |
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export async function createEndorserJwtForKey( |
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account: KeyMeta, |
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payload: object, |
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) { |
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if (account?.identity) { |
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// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
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const identity: IIdentifier = JSON.parse(account.identity!); |
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const privateKeyHex = identity.keys[0].privateKeyHex; |
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const signer = await SimpleSigner(privateKeyHex as string); |
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return didJwt.createJWT(payload, { |
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issuer: account.did, |
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signer: signer, |
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}); |
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} else if (account?.passkeyCredIdHex) { |
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return createDidPeerJwt(account.did, account.passkeyCredIdHex, payload); |
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} else { |
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throw new Error("No identity data found to sign for DID " + account.did); |
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} |
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} |
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/** |
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* Copied out of did-jwt since it's deprecated in that library. |
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* |
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* The SimpleSigner returns a configured function for signing data. |
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* |
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* @example |
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* const signer = SimpleSigner(import.meta.env.PRIVATE_KEY) |
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* signer(data, (err, signature) => { |
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* ... |
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* }) |
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* |
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* @param {String} hexPrivateKey a hex encoded private key |
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* @return {Function} a configured signer function |
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*/ |
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function SimpleSigner(hexPrivateKey: string): didJwt.Signer { |
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const signer = didJwt.ES256KSigner(didJwt.hexToBytes(hexPrivateKey), true); |
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return async (data) => { |
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const signature = (await signer(data)) as string; |
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return fromJose(signature); |
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}; |
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} |
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// from did-jwt/util; see SimpleSigner above
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function fromJose(signature: string): { |
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r: string; |
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s: string; |
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recoveryParam?: number; |
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} { |
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const signatureBytes: Uint8Array = didJwt.base64ToBytes(signature); |
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if (signatureBytes.length < 64 || signatureBytes.length > 65) { |
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throw new TypeError( |
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`Wrong size for signature. Expected 64 or 65 bytes, but got ${signatureBytes.length}`, |
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); |
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} |
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const r = bytesToHex(signatureBytes.slice(0, 32)); |
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const s = bytesToHex(signatureBytes.slice(32, 64)); |
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const recoveryParam = |
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signatureBytes.length === 65 ? signatureBytes[64] : undefined; |
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return { r, s, recoveryParam }; |
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} |
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// from did-jwt/util; see SimpleSigner above
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function bytesToHex(b: Uint8Array): string { |
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return u8a.toString(b, "base16"); |
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} |
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export function decodeEndorserJwt(jwt: string): JWTDecoded { |
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return didJwt.decodeJWT(jwt); |
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} |
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