signpdfx

Extract X.509 certificates from PDF signatures

Installation

npm install signpdfx

Usage

import { getCertificates } from 'signpdfx';
import { readFileSync } from 'fs';

const pdfBuffer = readFileSync('signed-document.pdf');
const certificates = getCertificates(pdfBuffer);

console.log('Found', certificates.length, 'certificates');
certificates.forEach((cert, index) => {
    console.log(`Certificate ${index + 1}:`);
    console.log('Subject:', cert.issuedTo.CN);
    console.log('Issuer:', cert.issuedBy.CN);
    console.log('Certificate Data:', cert.certificateData);
});

API

getCertificates(pdf)

Extract certificates from PDF buffer.

Parameters:

• pdf - PDF buffer

Returns: Array of certificate objects

Certificate Object Structure

{
  "clientCertificate": true,
  "issuedBy": { "commonName": "Issuer Name" },
  "issuedTo": { "commonName": "Subject Name" },
  "validityPeriod": {
    "notBefore": "2023-01-01T00:00:00.000Z",
    "notAfter": "2024-01-01T00:00:00.000Z"
  },
  "certificateData": "MIIEpjCCA46gAwIBAgIGAVif/3RzMA0GCSqGSIb3DQEBCwUAMIGLMR4wHAYDVQQH..."
}

License

MIT