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(PHP Extension) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.)
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // For this example, I have a certificate in raw base64 format (not PEM), // that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" $sbCertBase64 = new CkStringBuilder(); $success = $sbCertBase64->LoadFile('qa_data/certs/base64Cert.txt','utf-8'); $cert = new CkCert(); $success = $cert->LoadFromBase64($sbCertBase64->getAsString()); if ($success != true) { print $cert->lastErrorText() . "\n"; exit; } // Get the public key. // pubKey is a CkPublicKey $pubKey = $cert->ExportPublicKey(); if ($cert->get_LastMethodSuccess() != true) { print $cert->lastErrorText() . "\n"; exit; } // In Chilkat version v9.5.0.67, the KeySize property was added. $numBits = $pubKey->get_KeySize(); print 'Number of bits = ' . $numBits . "\n"; // If using an older version of Chilkat, the key size can be obtained like this: $xml = new CkXml(); $xml->LoadXml($pubKey->getXml()); $binDat = new CkBinData(); $binDat->AppendEncoded($xml->getChildContent('Modulus'),'base64'); $numBits = 8 * $binDat->get_NumBytes(); print 'Number of bits = ' . $numBits . "\n"; ?> |
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