chat_ws/extensions/utils/crypto.js

const jsSHA = require('jssha');
const bytes = require('./bytes');
const code = require('./code');
const base58 = require('./base58');

module.exports.getBase58CheckAddress = function (addressBytes) {
  const hash0 = SHA256(addressBytes);
    const hash1 = SHA256(hash0);

    let checkSum = hash1.slice(0, 4);
    checkSum = addressBytes.concat(checkSum);

    return base58.encode58(checkSum);
};

function SHA256(msgBytes) {
    const shaObj = new jsSHA('SHA-256', 'HEX');
    const msgHex = bytes.byteArray2hexStr(msgBytes);

    shaObj.update(msgHex);
    const hashHex = shaObj.getHash('HEX');

    return code.hexStr2byteArray(hashHex);
}