import * as pkijs from 'pkijs';
import * as fs from 'node:fs';

const buf = fs.readFileSync('sign.pdf.p7s');
const pkiObj = pkijs.ContentInfo.fromBER(buf);
const signedData = new pkijs.SignedData({ schema: pkiObj.content });
const cert = signedData.certificates[0];

let cn;

for (const tav of cert.subject.typesAndValues) {
    // Common name
    if (tav.type === '2.5.4.3') {
        cn = tav.value.valueBlock.value;
        break;
    }
}

const fromDate = new Date(cert.notBefore.value).toLocaleDateString();
const toDate = new Date(cert.notAfter.value).toLocaleDateString();
const serialArray = cert.serialNumber.valueBlock.valueHexView;
const serial = Buffer.from(serialArray).toString('hex');

console.log(cn);
console.log(fromDate);
console.log(toDate);
console.log(serial);