(Perl) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

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

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

use chilkat();

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

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

# The JWS to be created will contain one signature using an ECDSA key.

$sbEccJwk = chilkat::CkStringBuilder->new();
$sbEccJwk->Append("{\"kty\":\"EC\",");
$sbEccJwk->Append("\"crv\":\"P-256\",");
$sbEccJwk->Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",");
$sbEccJwk->Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\",");
$sbEccJwk->Append("\"d\":\"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI\"");
$sbEccJwk->Append("}");

$eccKey = chilkat::CkPrivateKey->new();
# Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
# into the private key object. (See the online reference documentation..)
$success = $eccKey->LoadJwk($sbEccJwk->getAsString());
if ($success != 1) {
    print $eccKey->lastErrorText() . "\r\n";
    exit;
}

# ---------------------------------------------------
# Prepare both a protected and unprotected header.

$jwsProtHdr = chilkat::CkJsonObject->new();
$jwsProtHdr->AppendString("alg","ES256");

$jwsUnprotHdr = chilkat::CkJsonObject->new();
$jwsUnprotHdr->AppendString("kid","myEcKey");

# ---------------------------------------------------
$jws = chilkat::CkJws->new();

$jws->SetProtectedHeader(0,$jwsProtHdr);
$jws->SetUnprotectedHeader(0,$jwsUnprotHdr);

$jws->SetPrivateKey(0,$eccKey);

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

# ---------------------------------------------------
# Create the JWS.
# Indicate we prefer the non-compact, flattened serialization.
$jws->put_PreferCompact(0);
$jws->put_PreferFlattened(1);

$jwsStr = $jws->createJws();
if ($jws->get_LastMethodSuccess() != 1) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

# The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
# To get in human-readable format, load into a Chilkat JSON object and emit..
$json = chilkat::CkJsonObject->new();
$json->Load($jwsStr);
$json->put_EmitCompact(0);
print $json->emit() . "\r\n";

# Sample output:

# { 
#   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
#   "protected": "eyJhbGciOiJFUzI1NiJ9",
#   "header": { 
#     "kid": "myEcKey"
#   },
#   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
# }