(Perl) Get ECC Public Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

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

use chilkat();

# Note: This example requires Chilkat v9.5.0.66 or later.

# Load a PEM file into memory.
$sbPem = chilkat::CkStringBuilder->new();
$success = $sbPem->LoadFile("qa_data/pem/ecc_public.pem","utf-8");
if ($success != 1) {
    print "Failed to load PEM file." . "\r\n";
    exit;
}

# Load the PEM into a public key object.
$pubKey = chilkat::CkPublicKey->new();
$success = $pubKey->LoadFromString($sbPem->getAsString());
if ($success != 1) {
    print $pubKey->lastErrorText() . "\r\n";
    exit;
}

# Get the public key in JWK format:
$jwk = $pubKey->getJwk();

# The GetJwk method will return the JWK in the most compact JSON format possible,
# as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
# load into a Chilkat JSON object and emit non-compact:

$json = chilkat::CkJsonObject->new();
$json->Load($jwk);
$json->put_EmitCompact(0);
print "ECC Public Key in JWK format:" . "\r\n";
print $json->emit() . "\r\n";

# Sample output:
# { 
#   "kty": "EC",
#   "crv": "P-256",
#   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
#   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
# }
# 
# Additional information can be added like this:
$json->AppendString("use","enc");
$json->AppendString("kid","123ABC");

# Now examine the JSON:
print $json->emit() . "\r\n";

# { 
#   "kty": "EC",
#   "crv": "P-256",
#   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
#   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
#   "use": "enc",
#   "kid": "123ABC"
# }