Tutorial for parsing X.509 certificate

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X509 class provides following features:

• read and parse PEM formatted X.509 certificate
• get basic fields
• get subject public key as RSAKey object

Getting Started

PEM formatted X.509 certificate is a plain text such as:

-----BEGIN CERTIFICATE-----
MIIBdTCCAR+gAwIBAgIBBTANBgkqhkiG9w0BAQUFADAaMQswCQYDVQQGEwJVUzEL
MAkGA1UECgwCYTEwHhcNMTMwNTA0MDM0MTQxWhcNMjMwNTA0MDM0MTQxWjAaMQsw
(snip)
CJLP08fOfNBZy+KAIy0GsrNU/3uRViqbuGqAnH9kFFwHQjOAFrAe8XQ=
-----END CERTIFICATE-----

To get basic fields of the certificate:

var c = new X509();
c.readCertPEM("-----BEGIN CERTIFICATE(snip)...");
var hSerial    = c.getSerialNumberHex(); // '009e755e" hexadecimal string
var sIssuer    = c.getIssuerString();    // '/C=US/O=z2'
var sSubject   = c.getSubjectString();   // '/C=US/O=z2'
var sNotBefore = c.getNotBefore();       // '100513235959Z'
var sNotAfter  = c.getNotAfter();        // '200513235959Z'

To get subject public key as RSAKey object:

var c = new X509();
c.readCertPEM("-----BEGIN CERTIFICATE(snip)...");
var pubKey = c.subjectPublicKeyRSA;  // public key as RSAKey object