Quickstart#

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

using System.IO;
using Aniketc068.ATick;

byte[] pdf = File.ReadAllBytes("doc.pdf");
byte[] pfx = File.ReadAllBytes("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

File.WriteAllBytes("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#

try
{
    Atick.SignPfx(pdf, pfx, "{\"password\":\"wrong\"}");
}
catch (AtickException e)
{
    Console.WriteLine("signing failed: " + e.Message);
}

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