jsonld-signatures-merkleproof2019/lib/esm/utils/keyUtils.js

A jsonld signature implementation to support MerkleProof2019 verification in Verifiable Credential context

import { Buffer as BufferPolyfill } from 'buffer';
// @ts-expect-error not a TS package
import * as multikey from '@digitalbazaar/ecdsa-multikey';
const buffer = typeof Buffer === 'undefined' ? BufferPolyfill : Buffer;
/** convert jwk to hex encoded public key */
export const publicKeyHexFromJwk = (jwk) => {
    jwk = {
        ...jwk,
        crv: 'K-256'
    };
    const compressed = multikey.toPublicKeyBytes({ jwk });
    return buffer.from(compressed).toString('hex');
};
/** convert jwk to binary encoded public key */
export const publicKeyUInt8ArrayFromJwk = (jwk) => {
    const publicKeyHex = publicKeyHexFromJwk(jwk);
    let asBuffer = buffer.from(publicKeyHex, 'hex');
    let padding = 32 - asBuffer.length;
    while (padding > 0) {
        asBuffer = buffer.concat([buffer.from('00', 'hex'), asBuffer]);
        padding--;
    }
    return asBuffer;
};
export const publicKeyUInt8ArrayFromMultibase = async ({ publicKeyMultibase }) => {
    const pubKeyJwk = await multikey.toJwk({ keyPair: { publicKeyMultibase } });
    return publicKeyUInt8ArrayFromJwk(pubKeyJwk);
};