Webcrypto Key Did Provider

This is a DID Provider which implements EIP2844 for did:key: using webcrypto with non-extractable keys.

Installation

npm install --save @didtools/key-webcrypto

Usage

import { CryptoKeyProvider, generateP256KeyPair } from '@didtools/key-webcrypto'
import KeyResolver from 'key-did-resolver'
import { DID } from 'dids'

const keyPair = generateP256KeyPair()
const provider = new WebcryptoProvider(keypair)
const did = new DID({ provider, resolver: KeyResolver.getResolver() })
await did.authenticate()

// log the DID
console.log(did.id)

// create JWS
const { jws, linkedBlock } = await did.createDagJWS({ hello: 'world' })

// verify JWS
await did.verifyJWS(jws)

Classes

• WebcryptoProvider

Functions

ecPointCompress

▸ ecPointCompress(x, y): Uint8Array

compress a public key with points x,y expressed as UintArrays source: https://stackoverflow.com/questions/17171542/algorithm-for-elliptic-curve-point-compression

Parameters

Name	Type	Description
x	Uint8Array	x point of public key
y	Uint8Array	y point of public key

Returns

Uint8Array

compressed form of public key as Uint8Array

---

encodeDIDFromPub

▸ encodeDIDFromPub(publicKey): string

Parameters

Name	Type
publicKey	Uint8Array

Returns

string

---

generateP256KeyPair

▸ generateP256KeyPair(): Promise<CryptoKeyPair>

Returns

Promise<CryptoKeyPair>

---

getPublicKey

▸ getPublicKey(«destructured»): Promise<Uint8Array>

Parameters

Name	Type
«destructured»	CryptoKeyPair

Returns

Promise<Uint8Array>