PHP

PKCS7 Sign Text using RSA 2048, SHA256, Base64 Output

See more Digital Signatures Examples

Demonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file. Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Crypt2;

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

$cert = new Cert();

// Load the cert and private key.  Whatever the private key happens to be,
// such as RSA or ECC, then Chilkat will use it.  If the private key is
// a 2048-bit RSA key, then that's what will be used..
try {
    $cert->LoadPfxFile('qa_data/pfx/myCertAndKey.p12', 'password');

    $crypt = new Crypt2();

    $crypt->SetSigningCert($cert);

    // Use SHA-256
    $crypt->HashAlgorithm = 'sha256';

    // Hash the utf-8 byte representation of the string
    $crypt->Charset = 'utf-8';

    // Return the result in base64
    $crypt->EncodingMode = 'base64';

    // Sign some text..
    $textToSign = 'This is the text to be hashed and signed.';
    $sigBase64 = $crypt->OpaqueSignStringENC($textToSign);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $sigBase64, "\n";

// The result:
// MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg==