Perl

Verify JWT Using an ECC Public Key (ES256, ES384, ES512)

See more JSON Web Token (JWT) Examples

Demonstrates how to verify a JWT that was signed using an ECC private key.

This example verifies the ECC signature. It also does the following:

• Checks to see if the time constraints ("nbf" and "exp") are valid.
• Recovers the original JOSE header.
• Recovers the original claims JSON.

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates how to verify an JWT using an ECC public key.

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

my $pubKey = Chilkat2::PublicKey->new;
my $success = $pubKey->LoadFromFile('qa_data/pem/ecc_public.pem');

my $jwt = Chilkat2::Jwt->new;

my $token = 'eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q';

# First verify the signature.
my $sigVerified = $jwt->VerifyJwtPk($token, $pubKey);
print 'verified: ', ($sigVerified ? 1 : 0), "\n";

# Let's see if the time constraints, if any, are valid.
# The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
# If the current system time is before the "nbf" time, or after the "exp" time,
# then IsTimeValid will return false/0.
# Also, we'll allow a leeway of 60 seconds to account for any clock skew.
# Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
my $leeway = 60;
my $bTimeValid = $jwt->IsTimeValid($token, $leeway);
print 'time constraints valid: ', ($bTimeValid ? 1 : 0), "\n";

# Now let's recover the original claims JSON (the payload).
my $payload = $jwt->GetPayload($token);
# The payload will likely be in compact form:
print $payload, "\n";

# We can format for human viewing by loading it into Chilkat's JSON object
# and emit.
my $json = Chilkat2::JsonObject->new;
$success = $json->Load($payload);
$json->EmitCompact(0);
print $json->Emit(), "\n";

# We can recover the original JOSE header in the same way:
my $joseHeader = $jwt->GetHeader($token);
# The payload will likely be in compact form:
print $joseHeader, "\n";

# We can format for human viewing by loading it into Chilkat's JSON object
# and emit.
$success = $json->Load($joseHeader);
$json->EmitCompact(0);
print $json->Emit(), "\n";