@stellot/crypto/lib/esm/secretBox/ed25519-box.js

Crypto libraries for front and backend

import { eddsa as Eddsa } from 'elliptic';
import { sha256 } from 'js-sha256';
import { sha512 } from 'js-sha512';
import { encrypt as _encrypt, decrypt as _decrypt } from '@stellot/secret-box';
export function encrypt(privKey, pubKey, input, nonce, authenticate = true) {
    const key = deriveKey(privKey, pubKey);
    return _encrypt(input, key, nonce, authenticate);
}
export function decrypt(privKey, pubKey, input, nonce, authenticate = true) {
    const key = deriveKey(privKey, pubKey);
    return _decrypt(input, key, nonce, authenticate);
}
const ec = new Eddsa('ed25519');
function deriveKey(privKey, pubKey) {
    const scalar = ec.decodeInt(getScalar(privKey));
    const point = ec.decodePoint(pubKey.toString('hex'));
    const secret = ec.encodePoint(point.mul(scalar));
    return Buffer.from(sha256.arrayBuffer(secret));
}
function getScalar(seed) {
    const hash = sha512.array(seed);
    hash[0] &= 0xf8;
    hash[31] &= 0x3f;
    hash[31] |= 0x40;
    return hash.slice(0, 32);
}