php实现往pdf中加数字签名操作示例【附源码下载】

本文实例讲述了php实现往pdf中加数字签名操作。分享给大家供大家参考，具体如下：

//============================================================+
// file name  : example_052.php
// begin    : 2009-05-07
// last update : 2013-05-14
//
// description : example 052 for tcpdf class
//        certification signature (experimental)
//
// author: nicola asuni
//
// (c) copyright:
//        nicola asuni
//        tecnick.com ltd
//        www.tecnick.com
//        [e-mail]
//============================================================+
/**
 * creates an example pdf test document using tcpdf
 * @package com.tecnick.tcpdf
 * @abstract tcpdf - example: certification signature (experimental)
 * @author nicola asuni
 * @since 2009-05-07
 */
// include the main tcpdf library (search for installation path).
require_once('tcpdf_include.php');
// create new pdf document
$pdf = new tcpdf(pdf_page_orientation, pdf_unit, pdf_page_format, true, 'utf-8', false);
// set document information
$pdf->setcreator(pdf_creator);
$pdf->setauthor('nicola asuni');
$pdf->settitle('tcpdf example 052');
$pdf->setsubject('tcpdf tutorial');
$pdf->setkeywords('tcpdf, pdf, example, test, guide');
// set default header data
$pdf->setheaderdata(pdf_header_logo, pdf_header_logo_width, pdf_header_title.' 052', pdf_header_string);
// set header and footer fonts
$pdf->setheaderfont(array(pdf_font_name_main, '', pdf_font_size_main));
$pdf->setfooterfont(array(pdf_font_name_data, '', pdf_font_size_data));
// set default monospaced font
$pdf->setdefaultmonospacedfont(pdf_font_monospaced);
// set margins
$pdf->setmargins(pdf_margin_left, pdf_margin_top, pdf_margin_right);
$pdf->setheadermargin(pdf_margin_header);
$pdf->setfootermargin(pdf_margin_footer);
// set auto page breaks
$pdf->setautopagebreak(true, pdf_margin_bottom);
// set image scale factor
$pdf->setimagescale(pdf_image_scale_ratio);
// set some language-dependent strings (optional)
if (@file_exists(dirname(__file__).'/lang/eng.php')) {
 require_once(dirname(__file__).'/lang/eng.php');
 $pdf->setlanguagearray($l);
}
// ---------------------------------------------------------
/*
notes:
 - to create self-signed signature: openssl req -x509 -nodes -days 365000 -newkey rsa:1024 -keyout tcpdf.crt -out tcpdf.crt
 - to export crt to p12: openssl pkcs12 -export -in tcpdf.crt -out tcpdf.p12
 - to convert pfx certificate to pem: openssl pkcs12 -in tcpdf.pfx -out tcpdf.crt -nodes
*/
// set certificate file
$certificate = 'file://data/cert/tcpdf.crt';
$certificate = 'file://'.realpath('./data/cert/tcpdf.crt');
// set additional information
$info = array(
 'name' => 'tcpdf',
 'location' => 'office',
 'reason' => 'testing tcpdf',
 'contactinfo' => 'http://www.tcpdf.org',
 );
// set document signature
$pdf->setsignature($certificate, $certificate, 'tcpdfdemo', '', 2, $info);
// set font
$pdf->setfont('helvetica', '', 12);
// add a page
$pdf->addpage();
// print a line of text
$text = 'this is a <b color="#ff0000">digitally signed document</b> using the default (example) <b>tcpdf.crt</b> certificate.<br />to validate this signature you have to load the <b color="#006600">tcpdf.fdf</b> on the arobat reader to add the certificate to <i>list of trusted identities</i>.<br /><br />for more information check the source code of this example and the source code documentation for the <i>setsignature()</i> method.<br /><br /><a href="http://www.tcpdf.org" rel="external nofollow" >www.tcpdf.org</a>';
$pdf->writehtml($text, true, 0, true, 0);
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// *** set signature appearance ***
// create content for signature (image and/or text)
$pdf->image('images/tcpdf_signature.png', 180, 60, 15, 15, 'png');
// define active area for signature appearance
$pdf->setsignatureappearance(180, 60, 15, 15);
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// *** set an empty signature appearance ***
$pdf->addemptysignatureappearance(180, 80, 15, 15);
// ---------------------------------------------------------
//close and output pdf document
$pdf->output('example_052.pdf', 'd');
//============================================================+
// end of file
//============================================================+

其中tcpdf_include.php文件(源自tcpdf插件)如下：

<?php
//============================================================+
// file name  : tcpdf_include.php
// begin    : 2008-05-14
// last update : 2014-12-10
//
// description : search and include the tcpdf library.
//
// author: nicola asuni
//
// (c) copyright:
//        nicola asuni
//        tecnick.com ltd
//        www.tecnick.com
//        [e-mail]
//============================================================+
/**
 * search and include the tcpdf library.
 * @package com.tecnick.tcpdf
 * @abstract tcpdf - include the main class.
 * @author nicola asuni
 * @since 2013-05-14
 */
// always load alternative config file for examples
require_once('config/tcpdf_config_alt.php');
// include the main tcpdf library (search the library on the following directories).
$tcpdf_include_dirs = array(
 realpath('../tcpdf.php'),
 '/usr/share/php/tcpdf/tcpdf.php',
 '/usr/share/tcpdf/tcpdf.php',
 '/usr/share/php-tcpdf/tcpdf.php',
 '/var/www/tcpdf/tcpdf.php',
 '/var/www/html/tcpdf/tcpdf.php',
 '/usr/local/apache2/htdocs/tcpdf/tcpdf.php'
);
foreach ($tcpdf_include_dirs as $tcpdf_include_path) {
 if (@file_exists($tcpdf_include_path)) {
 require_once($tcpdf_include_path);
 break;
 }
}
//============================================================+
// end of file
//============================================================+

eng.php文件如下：

<?php
//============================================================+
// file name  : eng.php
// begin    : 2004-03-03
// last update : 2010-10-26
//
// description : language module for tcpdf
//        (contains translated texts)
//        english
//
// author: nicola asuni
//
// (c) copyright:
//        nicola asuni
//        tecnick.com ltd
//        manor coach house, church hill
//        aldershot, hants, gu12 4rq
//        uk
//        www.tecnick.com
//        [e-mail]
//============================================================+
/**
 * tcpdf language file (contains translated texts).
 * @package com.tecnick.tcpdf
 * @brief tcpdf language file: english
 * @author nicola asuni
 * @since 2004-03-03
 */
// english
global $l;
$l = array();
// page meta descriptors --------------------------------------
$l['a_meta_charset'] = 'utf-8';
$l['a_meta_dir'] = 'ltr';
$l['a_meta_language'] = 'en';
// translations --------------------------------------
$l['w_page'] = 'page';
//============================================================+
// end of file
//============================================================+

补充：

tcpdf.crt文件点击此处。

tcpdf插件点击此处。

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希望本文所述对大家php程序设计有所帮助。