(Perl) Create Enveloping XML Signature with Multiple References

Demonstrates how to create an enveloping XML digital signature containing multiple Object references.

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.

# This example creates an XML signature that contains three Objects:
# 
# 1. A base64 encoded JPG image.
# 2. Some plain text.
# 3. Some JSON.
# 

# Get a small JPG image.
$jpgData = chilkat::CkBinData->new();
$http = chilkat::CkHttp->new();
$success = $http->QuickGetBd("https://www.chilkatsoft.com/images/starfish.jpg",$jpgData);
if ($success != 1) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

# Get a small JSON document.
$sbJson = chilkat::CkStringBuilder->new();
$success = $http->QuickGetSb("https://www.chilkatsoft.com/exampleData/sample.json",$sbJson);
if ($success != 1) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

# Get an RSA private key for signing.
$sbPem = chilkat::CkStringBuilder->new();
$success = $http->QuickGetSb("https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem",$sbPem);
if ($success != 1) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

$rsaKey = chilkat::CkPrivateKey->new();
$success = $rsaKey->LoadEncryptedPem($sbPem->getAsString(),"secret");
if ($success != 1) {
    print $rsaKey->lastErrorText() . "\r\n";
    exit;
}

# OK.. ready to begin building the signature.
$gen = chilkat::CkXmlDSigGen->new();

# Provide the RSA key to the XML Digital Signature generator
$gen->SetPrivateKey($rsaKey);

# Add enveloped references to the content to be signed.
$sbContent = chilkat::CkStringBuilder->new();
$sbContent->Append("The quick brown fox jumped over the lazy dog.");
$gen->AddEnvelopedRef("aaa",$sbContent,"sha256","C14N","");

$gen->AddEnvelopedRef("bbb",$sbJson,"sha256","C14N","");

$sbBase64 = chilkat::CkStringBuilder->new();
# Use "base64_mime" to encode the JPG data to base64 in multiple lines.
$jpgData->GetEncodedSb("base64_mime",$sbBase64);
$gen->AddEnvelopedRef("ccc",$sbBase64,"sha256","C14N","");

# Generate the XML digital signature.
$sbXml = chilkat::CkStringBuilder->new();
$success = $gen->CreateXmlDSigSb($sbXml);
if ($success != 1) {
    print $gen->lastErrorText() . "\r\n";
    exit;
}

# Examine the enveloped signature, where the data for each reference is contained within the XML Signature
print $sbXml->getAsString() . "\r\n";

# The exact XML signature looks like this:
# (A pretty-printed XML signature is shown further below, but beware that the introduced whitespace breaks the signature.)

# <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#aaa"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>f0KK1a9yt2XMxCcr5Keziiv4BpAev/rRt/CGSJwS9i0=</ds:DigestValue></ds:Reference><ds:Reference URI="#bbb"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>buBASaqBjJXez8r/hFz4ZIIf+1mgf63AoI8MihViJtU=</ds:DigestValue></ds:Reference><ds:Reference URI="#ccc"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>+9PN/3Bz7xOuqi/wIBlGHEwPx+YUoILMsr2Iu0i1cCU=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>fI9l6/CKuwa7J2cczBzsKTOKec6cOVX/ehY2RcDZreGJlSo8bgv++nliFTwPyiZ8GT1Q2rDrA8biOt/ysZWnfim6AR79ld9CtLuKdqNsS/aSjwroDG/eWM0447zWoDSgAIsjXUAsF5xLschFW7+pGoPl5S1fVT/PUBkySlBi0I/U8P2UdiY8GoAL2rkHxTxDHaWh1GpBY28o9MSCuTgTiLVHF6WbmdHggqMc70OSTRh5vCMzZRTaAkTH6SWYt2WczKwmVea7hkM3BhpbA3EnpEIxK7TFl2GkFGXxAyXAxe2SVmXngt025LOFtU72fE+eChbqr5tejWl81z1g2F7ZnQ==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:RSAKeyValue><ds:Modulus>sXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNiwUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv/gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyTEvb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUbE9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue></ds:KeyValue></ds:KeyInfo><ds:Object Id="aaa">The quick brown fox jumped over the lazy dog.</ds:Object><ds:Object Id="bbb">{
#    "apple": "red",
#    "lime": "green",
#    "banana": "yellow",
#    "broccoli": "green",
#    "strawberry": "red"
# }
# </ds:Object><ds:Object Id="ccc">/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
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# AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA
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