CODEWITHSUNDEEP
firefox-addonssl-certificate
Heshan Perera
Heshan Perera

Reputation: 4630

Detect level of SSL encryption on a web page (128 or 256) in a firefox extension

I am developing a Firefox extension where I need to know the level of SSL encryption of a web page that is loaded. (whether it is a 128 bit encryption or 256 bit encryption).

Basically I need to detect whether the given page is a secure payment page.

Any idea how this could be done?

Upvotes: 1

Views: 265

Answers (1)

Wladimir Palant
Wladimir Palant

Reputation: 57661

What you need is the nsISSLStatus interface. You can get it for a page loaded into a <browser> element or the current tab of a <tabbrowser> element (e.g. gBrowser if you want the <tabbrowser> element in the Firefox browser window) like this:

var status = gBrowser.securityUI
                     .QueryInterface(Components.interfaces.nsISSLStatusProvider)
                     .SSLStatus;
if (status && !status.isUntrusted)
{
  alert("Cipher: " + status.cipherName);
  alert("Key length: " + status.keyLength);
}

Please don't look at the key length without looking at the cipher used - the key length alone is meaningless.

Upvotes: 2

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