Perl Requires Chilkat v11.0.0+

Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) that uses RSASSA-PKCS1-v1_5 SHA-256. Perl

use chilkat();

$success = 0;

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

#  This example takes a JSON signature in compact serialization format,
#  and uses an RSA public key to validate and recover the protected header and payload.

#  We only need a public key for signature validation.  This is the RSA public key
#  that is used:

#       {"kty":"RSA", 
#        "n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx
#             HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs
#             D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH
#             SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV
#             MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8
#             NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ", 
#        "e":"AQAB"
#       }

$sbPubKey = chilkat::CkStringBuilder->new();
$sbPubKey->Append("{\"kty\":\"RSA\",");
$sbPubKey->Append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx");
$sbPubKey->Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs");
$sbPubKey->Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH");
$sbPubKey->Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV");
$sbPubKey->Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8");
$sbPubKey->Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",");
$sbPubKey->Append("\"e\":\"AQAB\"");
$sbPubKey->Append("}");

$pubKey = chilkat::CkPublicKey->new();
$success = $pubKey->LoadFromString($sbPubKey->getAsString());
if ($success == 0) {
    print $pubKey->lastErrorText() . "\r\n";
    exit;
}

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

#  Set the RSA public key:
$signatureIndex = 0;
$jws->SetPublicKey($signatureIndex,$pubKey);

#  Load the JWS.
$sbJws = chilkat::CkStringBuilder->new();
$sbJws->Append("eyJhbGciOiJSUzI1NiJ9");
$sbJws->Append(".");
$sbJws->Append("eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt");
$sbJws->Append("cGxlLmNvbS9pc19yb290Ijp0cnVlfQ");
$sbJws->Append(".");
$sbJws->Append("cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7");
$sbJws->Append("AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4");
$sbJws->Append("BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K");
$sbJws->Append("0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv");
$sbJws->Append("hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB");
$sbJws->Append("p0igcN_IoypGlUPQGe77Rw");

$success = $jws->LoadJwsSb($sbJws);
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

#  Validate the 1st (and only) signature at index 0..
$v = $jws->Validate($signatureIndex);
if ($v < 0) {
    #  Perhaps Chilkat was not unlocked or the trial expired..
    print "Method call failed for some other reason." . "\r\n";
    print $jws->lastErrorText() . "\r\n";
    exit;
}

if ($v == 0) {
    print "Invalid signature.  The RSA key was incorrect, the JWS was invalid, or both." . "\r\n";
    exit;
}

#  If we get here, the signature was validated..
print "Signature validated." . "\r\n";
print "--" . "\r\n";

#  Recover the original content:
print "Recovered content:" . "\r\n";
print $jws->getPayload("utf-8") . "\r\n";
print "--" . "\r\n";

#  Examine the protected header:

$joseHeader = chilkat::CkJsonObject->new();
$success = $jws->GetProtectedH($signatureIndex,$joseHeader);
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

$joseHeader->put_EmitCompact(0);

print "Protected (JOSE) header:" . "\r\n";
print $joseHeader->emit() . "\r\n";

#  Output:

#  	Signature validated.
#  	--
#  	Recovered content:
#  	{"iss":"joe", 
#  	 "exp":1300819380,
#  	 "http://example.com/is_root":true}
#  	--
#  	Protected (JOSE) header:
#  	{ 
#  	  "alg": "RS256"
#  	}