Quickstart

Sign a PDF with a .pfx (or .p12 / .pem) and a visible green-tick appearance.

import io.github.aniketc068.atick.Atick;
import java.nio.file.*;

public class Quickstart {
    public static void main(String[] args) throws Exception {
        byte[] pdf = Files.readAllBytes(Paths.get("doc.pdf"));
        byte[] pfx = Files.readAllBytes(Paths.get("my.pfx"));

        byte[] signed = Atick.signPfx(pdf, pfx,
            "{\"password\":\"••••\",\"cn\":\"Aniket Chaturvedi\",\"reason\":\"Approved\","
          + "\"green_tick\":true,\"page\":1,\"rect\":[300,55,575,175],"
          + "\"pades\":true,\"timestamp\":true,\"ltv\":true}");   // PAdES-B-LT

        Files.write(Paths.get("signed.pdf"), signed);
    }
}

Open signed.pdf in Adobe Reader — for a trusted certificate it shows a valid green tick and “Signed and all signatures are valid.”

What the options mean

Option	Meaning
password	the PFX/P12 password (use "" for a PEM file)
cn	the signer name shown in the appearance
reason	the reason recorded in the signature
green_tick	draw the ? mark Adobe greens for a valid+trusted certificate
page, rect	where to draw the appearance — page number and [x1,y1,x2,y2] (PDF points)
pades	produce a PAdES (ETSI) signature
timestamp	add an RFC-3161 timestamp (PAdES-B-T)
ltv	embed the chain + revocation for long-term validation (PAdES-B-LT)

A minimal, invisible signature

byte[] signed = Atick.signPfx(pdf, pfx,
    "{\"password\":\"••••\",\"placements\":[],\"pades\":true}");   // valid, nothing drawn

Catching errors

Every failure is a normal Java exception:

try {
    Atick.signPfx(pdf, pfx, "{\"password\":\"wrong\"}");
} catch (Atick.AtickException e) {
    System.out.println("signing failed: " + e.getMessage());
}

Next: see Signing for all the signing options, or the API reference.