PHP
Sign PDF for ICP-Brasil

Sign a PDF to create a signed PDF compliant with the ICP-Brasil Digital Signature Standard Conformity Checker. (Verificador de Conformidade do Padrão de Assinatura Digital ICP-Brasil)
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<?php

use Chilkat2\Cert;
use Chilkat2\JsonObject;
use Chilkat2\Pdf;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The signed PDF produced by this example should be verifiable at https://validar.iti.gov.br/
$pdf = new Pdf();

// Load a PDF to be signed.
// The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
try {
    $pdf->LoadFile('qa_data/pdf/hello.pdf');

    $json = new JsonObject();

    // Define the appearance and location of the signature.
    $json->UpdateInt('page', 1);
    $json->UpdateString('appearance.y', 'bottom');
    $json->UpdateString('appearance.x', 'middle');
    $json->UpdateString('appearance.fontScale', '9.0');
    $json->UpdateString('appearance.text[0]', 'Digitally signed by: cert_cn');
    $json->UpdateString('appearance.text[1]', 'current_dt');
    $json->UpdateString('appearance.image', 'document-accepted');
    $json->UpdateString('appearance.imagePlacement', 'left');
    $json->UpdateString('appearance.imageOpacity', '100');

    // Add the CMS options required for ICP-Brasil
    $json->UpdateInt('contentType', 1);
    $json->UpdateInt('messageDigest', 1);
    $json->UpdateInt('signingCertificateV2', 1);
    $json->UpdateBool('ltvOcsp', true);

    // Listed here are the currently existing profiles. (Chilkat will add additional ICP Brasil policy profiles in future versions as new ones are created.)
    // See https://www.gov.br/iti/pt-br/assuntos/repositorio/artefatos-de-assinatura-digital for more information.
    //
    // PA_AD_RA_v1_1 --> 2.16.76.1.7.1.5.1.1
    // PA_AD_RA_v1_2 --> 2.16.76.1.7.1.5.1.2
    // PA_AD_RA_v2_0 --> 2.16.76.1.7.1.5.2
    // PA_AD_RA_v2_1 --> 2.16.76.1.7.1.5.2.1
    // PA_AD_RA_v2_2 --> 2.16.76.1.7.1.5.2.2
    // PA_AD_RA_v2_3 --> 2.16.76.1.7.1.5.2.3
    // PA_AD_RA_v2_4 --> 2.16.76.1.7.1.5.2.4

    // PA_AD_RB_v1_1 --> 2.16.76.1.7.1.1.1.1
    // PA_AD_RB_v2_0 --> 2.16.76.1.7.1.1.2
    // PA_AD_RB_v2_1 --> 2.16.76.1.7.1.1.2.1
    // PA_AD_RB_v2_2 --> 2.16.76.1.7.1.1.2.2
    // PA_AD_RB_v2_3 --> 2.16.76.1.7.1.1.2.3

    // PA_AD_RC_v1_1 --> 2.16.76.1.7.1.4.1.1
    // PA_AD_RC_v2_0 --> 2.16.76.1.7.1.4.2
    // PA_AD_RC_v2_1 --> 2.16.76.1.7.1.4.2.1
    // PA_AD_RC_v2_2 --> 2.16.76.1.7.1.4.2.2
    // PA_AD_RC_v2_3 --> 2.16.76.1.7.1.4.2.3

    // PA_AD_RT_v1_1 --> 2.16.76.1.7.1.2.1.1
    // PA_AD_RT_v2_0 --> 2.16.76.1.7.1.2.2
    // PA_AD_RT_v2_1 --> 2.16.76.1.7.1.2.2.1
    // PA_AD_RT_v2_2 --> 2.16.76.1.7.1.2.2.2
    // PA_AD_RT_v2_3 --> 2.16.76.1.7.1.2.2.3

    // PA_AD_RV_v1_1 --> 2.16.76.1.7.1.3.1.1
    // PA_AD_RV_v2_0 --> 2.16.76.1.7.1.3.2
    // PA_AD_RV_v2_1 --> 2.16.76.1.7.1.3.2.1
    // PA_AD_RV_v2_2 --> 2.16.76.1.7.1.3.2.2
    // PA_AD_RV_v2_3 --> 2.16.76.1.7.1.3.2.3

    // PA_PAdES_AD_RA_v1_0 --> 2.16.76.1.7.1.14.1
    // PA_PAdES_AD_RA_v1_1 --> 2.16.76.1.7.1.14.1.1
    // PA_PAdES_AD_RA_v1_2 --> 2.16.76.1.7.1.14.1.2
    // PA_PAdES_AD_RB_v1_0 --> 2.16.76.1.7.1.11.1
    // PA_PAdES_AD_RB_v1_1 --> 2.16.76.1.7.1.11.1.1
    // PA_PAdES_AD_RC_v1_0 --> 2.16.76.1.7.1.13.1
    // PA_PAdES_AD_RC_v1_1 --> 2.16.76.1.7.1.13.1.1
    // PA_PAdES_AD_RC_v1_2 --> 2.16.76.1.7.1.13.1.2
    // PA_PAdES_AD_RT_v1_0 --> 2.16.76.1.7.1.12.1
    // PA_PAdES_AD_RT_v1_1 --> 2.16.76.1.7.1.12.1.1

    // Set the policy profile name
    // ---------------------------------------------------
    // Note: On 24-May-2024, I was informed that adding the "policyId.profile"
    // causes the PDF signature to fail validation at https://validar.iti.gov.br/
    // Perhaps something changed in the years since this example was originally written and tested to be working.
    // You may need to omit the "policyId.profile".
    // ---------------------------------------------------
    $json->UpdateString('policyId.profile', 'PA_PAdES_AD_RB_v1_1');

    // Load the signing certificate. (Use your own certificate.)
    // Note: If loading from a smart card, call LoadFromSmartcard instead, and make sure to use Chilkat v9.5.0.88 or later.
    $cert = new Cert();
    $cert->LoadPfxFile('qa_data/pfx/myPdfSigningCert.pfx', 'pfx_password');

    // Tell the pdf object to use the certificate for signing.
    $pdf->SetSigningCert($cert);

    $pdf->SignPdf($json, 'qa_output/hello_signed.pdf');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "The PDF has been successfully cryptographically signed.\n";