(Perl) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

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

use chilkat();

# Demonstrates how to create an HMAC JWT using a shared secret (password).

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

$jwt = chilkat::CkJwt->new();

# Build the JOSE header
$jose = chilkat::CkJsonObject->new();
# Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
$success = $jose->AppendString("alg","HS256");
$success = $jose->AppendString("typ","JWT");

# Now build the JWT claims (also known as the payload)
$claims = chilkat::CkJsonObject->new();
$success = $claims->AppendString("iss","http://example.org");
$success = $claims->AppendString("sub","John");
$success = $claims->AppendString("aud","http://example.com");

# Set the timestamp of when the JWT was created to now.
$curDateTime = $jwt->GenNumericDate(0);
$success = $claims->AddIntAt(-1,"iat",$curDateTime);

# Set the "not process before" timestamp to now.
$success = $claims->AddIntAt(-1,"nbf",$curDateTime);

# Set the timestamp defining an expiration time (end time) for the token
# to be now + 1 hour (3600 seconds)
$success = $claims->AddIntAt(-1,"exp",$curDateTime + 3600);

# Produce the smallest possible JWT:
$jwt->put_AutoCompact(1);

$strJwt = $jwt->createJwt($jose->emit(),$claims->emit(),"secret");

print $strJwt . "\r\n";