(Perl) PDF Signatures with Built-in SVG Graphics

See more PDF Signatures Examples

This example demonstrates the built-in SVG graphics that can be applied to the appearance when signing a PDF.

Note: This example requires Chilkat v9.5.0.85 or greater.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$pdf = chilkat::CkPdf->new();

# Load a PDF to be signed.
# The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
$success = $pdf->LoadFile("qa_data/pdf/hello.pdf");
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

# Options for signing are specified in JSON.
$json = chilkat::CkJsonObject->new();

# In most cases, the signingCertificateV2 and signingTime attributes are required.
$json->UpdateInt("signingCertificateV2",1);
$json->UpdateInt("signingTime",1);

# Specify the location/position, scale, and content of the signature's appearance.
$json->UpdateInt("page",1);
$json->UpdateString("appearance.y","top");
$json->UpdateString("appearance.x","left");
$json->UpdateString("appearance.fontScale","10.0");
$json->UpdateString("appearance.text[0]","Digitally signed by: cert_cn");
$json->UpdateString("appearance.text[1]","current_dt");
$json->UpdateString("appearance.text[2]","The crazy brown fox jumps over the lazy dog.");

# In addition to the above, this example adds a built-in SVG graphic to the appearance.
# The built-in SVG graphic is specified by a name, such as "green-check-grey-circle".
# The full list of graphic names and images are shown below.
$json->UpdateString("appearance.image","green-check-grey-circle");

# The graphic can be placed "left", "center", or "right".
# If "center", then the graphic is displayed behind the text.
$json->UpdateString("appearance.imagePlacement","left");

# The graphic's opacity can range from 1 to 100.
# Centered graphics look best with less opacity (50 or less).
# In this example, we'll keep the opacity at 100.
$json->UpdateString("appearance.imageOpacity","100");

# Here's an example of the signature's appearance if we centered the SVG graphic with an opacity of 40%


# Load the signing certificate. (Use your own certificate.)
$cert = chilkat::CkCert->new();
$success = $cert->LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret");
if ($success == 0) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

# Tell the pdf object to use the certificate for signing.
$success = $pdf->SetSigningCert($cert);
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

$success = $pdf->SignPdf($json,"qa_output/hello_signed.pdf");
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

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

# The appearance of the signature appears in Adobe Acrobat as shown here:



# The SVG icon graphics are embedded within the Chilkat library, 
# and were graciously provided by uxwing - Free SVG Icons 
# 
# The uxwing licensing terms are reproduced here and can be verified at uxwing licensing

# Icons from uxwing.com are free (see https://uxwing.com/license/)
# 	- All icons on UXWing free to download, and use personal, commercial projects.
# 	- Attribution and Credit is NOT required, however, any credit will be much appreciated.
# 	- There is no limit to the number of times you can use.
# 	- You may modify the resources according to your requirements.

# The set of SVG names and the corresponding graphics are shown below.
# 
# For example, if we specify "green-check-green-circle"
$json->UpdateString("appearance.image","green-check-green-circle");
# We get:


# "application-approved"


# "application-rejected"


# "document-accepted"


# "approved"


# "blue-check-mark"


# "green-check-mark"


# "green-check-grey-circle"


# "red-x-red-circle"


# "rejected"


# "result-failure"


# "result-pass"


# "signature"


# "document-check"


# "document-x"


# "red-x-grey-circle"