openpgp-php/examples/clearsign.php

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<?php
@include_once dirname(__FILE__).'/../vendor/autoload.php';
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require_once dirname(__FILE__).'/../lib/openpgp.php';
require_once dirname(__FILE__).'/../lib/openpgp_crypt_rsa.php';
/* Parse secret key from STDIN, the key must not be password protected */
$wkey = OpenPGP_Message::parse(file_get_contents('php://stdin'));
$wkey = $wkey[0];
$string = "This\nis\na\ntest.";
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/* Create a new literal data packet */
$data = new OpenPGP_LiteralDataPacket($string, array('format' => 'u', 'filename' => 'stuff.txt'));
$data->normalize(true); // Clearsign-style normalization of the LiteralDataPacket
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/* Create a signer from the key */
$sign = new OpenPGP_Crypt_RSA($wkey);
/* The message is the signed data packet */
$m = $sign->sign($data);
/* Generate clearsigned data */
$packets = $m->signatures()[0];
echo "-----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n";
// Output normalised data. You could convert line endings here
// without breaking the signature, but do not add any
// trailing whitespace to lines.
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echo preg_replace("/^-/", "- -", $packets[0]->data)."\n";
echo OpenPGP::enarmor($packets[1][0]->to_bytes(), "PGP SIGNATURE");