index.md

---

title: webRequest.CertificateInfo
slug: Mozilla/Add-ons/WebExtensions/API/webRequest/CertificateInfo
page-type: webextension-api-type
tags:
  - API
  - Add-ons
  - CertificateInfo
  - Extensions
  - Reference
  - Type
  - WebExtensions
  - webRequest
browser-compat: webextensions.api.webRequest.CertificateInfo

---

{{AddonSidebar()}}

An object describing a single X.509 certificate.

The {{WebExtAPIRef("webRequest.SecurityInfo", "SecurityInfo")}} object returned from the {{WebExtAPIRef("webRequest.getSecurityInfo()")}} API includes a certificates property which is an array of these objects.

Type

Values of this type are objects. They contain the following properties:

• fingerprint

  • : Object. An object with the following properties:

    • sha1

      • : String. SHA-1 hash of the certificate's DER encoding.

    • sha256

      • : String. SHA-256 hash of the certificate's DER encoding.

• isBuiltInRoot

  • : Boolean. true if the certificate is one of the trust roots installed in the browser, false otherwise.

• issuer

  • : String. Name of the organization that issued this certificate, represented as a Distinguished Name and formatted as a comma-separated list of Relative Distinguished Names, each of the form "type=value".

    For example: "CN=DigiCert SHA2 Secure Server CA,O=DigiCert Inc,C=US".

• rawDER

  • : Array of Number. If webRequest.getSecurityInfo() was called with the rawDER option present and set to true, this will contain the DER encoding of the certificate.

• serialNumber

  • : String. The certificate's serial number.

• subject

  • : String. Name of the organization that issued this certificate, represented as a Distinguished Name and formatted as a comma-separated list of Relative Distinguished Names, each of the form "type=value".

    For example: "CN=*.cdn.mozilla.net,O=Mozilla Corporation,L=Mountain View,ST=California,C=US".

• subjectPublicKeyInfoDigest

  • : Object. An object containing the following properties:

    • sha256

      • : String. Base64 encoded SHA-256 hash of the DER-encoded public key info.

• validity

  • : Object. Validity period for the certificate. An object containing the following properties:

    • start

      • : Number. The start of the certificate's validity period, in milliseconds since the epoch.

    • end

      • : Number. The end of the certificate's validity period, in milliseconds since the epoch.

Browser compatibility

{{Compat}}

{{WebExtExamples}}