Perl Requires Chilkat v11.0.0+

JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Creates a JSON Web Signatures (JWS) using HMAC SHA-256. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

# First create the JWS Protected Header
my $jwsProtHdr = Chilkat2::JsonObject->new;
$jwsProtHdr->AppendString('typ', 'JWT');
$jwsProtHdr->AppendString('alg', 'HS256');
print 'JWS Protected Header: ', $jwsProtHdr->Emit(), "\n";

# Output:
# JWS Protected Header: {"typ":"JWT","alg":"HS256"}

my $jws = Chilkat2::Jws->new;

# Set the HMAC key:
my $hmacKey = 'AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow';
my $signatureIndex = 0;
$jws->SetMacKey($signatureIndex, $hmacKey, 'base64url');

# Set the protected header:
$jws->SetProtectedHeader($signatureIndex, $jwsProtHdr);

# Set the payload.
my $bIncludeBom = 0;
my $payloadStr = 'In our village, folks say God crumbles up the old moon into stars.';
$jws->SetPayload($payloadStr, 'utf-8', $bIncludeBom);

# Create the JWS
# By default, the compact serialization is used.
my $jwsCompact = $jws->CreateJws();
if (!$jws->LastMethodSuccess) {
    print $jws->LastErrorText, "\n";
    exit;
}

print 'JWS: ', $jwsCompact, "\n";

# sample output:
# JWS: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.bsYsi8HJ0N6OqGI1hKQ9QQRNPxxA5qMpcHLtOvXatk8

# Now load the JWS, validate, and recover the original text.
my $jws2 = Chilkat2::Jws->new;

# Load the JWS.
my $success = $jws2->LoadJws($jwsCompact);

# Set the MAC key used for validation.
$signatureIndex = 0;
$jws2->SetMacKey($signatureIndex, $hmacKey, 'base64url');

# Validate the 1st (and only) signature at index 0..
my $v = $jws2->Validate($signatureIndex);
if ($v < 0) {
    # Perhaps Chilkat was not unlocked or the trial expired..
    print "Method call failed for some other reason.\n";
    print $jws2->LastErrorText, "\n";
    exit;
}

if ($v == 0) {
    print "Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both.\n";
    exit;
}

# If we get here, the signature was validated..
print "Signature validated.\n";

# Recover the original content:
print $jws2->GetPayload('utf-8'), "\n";

# Examine the protected header:

my $joseHeader = Chilkat2::JsonObject->new;
$success = $jws2->GetProtectedH($signatureIndex, $joseHeader);
if (!$success) {
    print $jws2->LastErrorText, "\n";
    exit;
}

$joseHeader->EmitCompact(0);

print "Protected (JOSE) header:\n";
print $joseHeader->Emit(), "\n";

# Output:

#     Signature validated.
#     In our village, folks say God crumbles up the old moon into stars.
#     Protected (JOSE) header:
#     {
#       "typ": "JWT",
#       "alg": "HS256"
#     }