Perl Requires Chilkat v9.5.0.84+

Verify JWT with EdDSA / Ed25519 Signature

See more JSON Web Token (JWT) Examples

Demonstrates how to verify a JWT that was signed using an Ed25519 private key.

This example verifies the EdDSA 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 data.

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates how to verify a JWT with an EdDSA/Ed25519 Signature

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

# Use this Ed25519 public key for verification

my $jsonPubKey = '{"kty": "OKP","alg": "EdDSA","crv": "Ed25519","x": "11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo"}';

my $pubKey = Chilkat2::PublicKey->new;
my $success = $pubKey->LoadFromString($jsonPubKey);
if (!$success) {
    print $pubKey->LastErrorText, "\n";
    exit;
}

my $jwt = Chilkat2::Jwt->new;
my $token = 'eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg';

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

if (!$sigVerified) {
    print $jwt->LastErrorText, "\n";
    exit;
}

# 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";

# Recover the original data (the payload).
my $payload = $jwt->GetPayload($token);
print $payload, "\n";

# Recover the original JOSE header in the same way:
my $joseHeader = $jwt->GetHeader($token);
print $joseHeader, "\n";