Zend_OpenId is a Zend Framework component that provides a simple API for building OpenID-enabled sites and identity providers.
OpenID is a set of protocols for user-centric digital identities. These protocols allows users to create an identity online, using an identity provider. This identity can be used on any site that supports OpenID. Using OpenID-enabled sites, users do not need to remember traditional authentication tokens such as usernames and passwords for each site. All OpenID-enabled sites accept a single OpenID identity. This identity is typically a URL. It may be the URL of the user’s personal page, blog or other resource that may provide additional information about them. That mean a user needs just one identifier for all sites he or she uses. services. OpenID is an open, decentralized, and free user-centric solution. Users may choose which OpenID provider to use, or even create their own personal identity server. No central authority is required to approve or register OpenID-enabled sites or identity providers.
For more information about OpenID visit the OpenID official site.
The purpose of the Zend_OpenId component is to implement the OpenID authentication protocol as described in the following sequence diagram:
. The OpenID provider checks if the User-Agent is already authenticated and, if not, offers to do so.
. The end user enters the required password.
. The user allows or disallows passing his identity.
Zend_OpenId consists of two sub-packages. The first one is Zend_OpenId_Consumer for developing OpenID-enabled sites, and the second is Zend_OpenId_Provider for developing OpenID servers. They are completely independent of each other and may be used separately.
The only common code used by these sub-packages are the OpenID Simple Registration Extension implemented by Zend_OpenId_Extension_Sreg class and a set of utility functions implemented by the Zend_OpenId class.
Note
Zend_OpenId takes advantage of the GMP extension, where available. Consider enabling the GMP extension for enhanced performance when using Zend_OpenId.
The Zend_OpenId component supports the following standards:
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