[TYPO3-core] RFC #17388: Bug: rsaauth with more than one login form on one page doesn't work

[Marco Huber]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=17388

Branches: Trunk

Problem:
If you have more than one login form on one page only the last rendered 
login form will work. This happens because when the second login form is 
rendered the created private key overwrites the first form's private 
key. This problem is also described on forge: 
http://forge.typo3.org/issues/6708

Solution:
In my patch the class tx_rsaauth_keypair is a singleton so that it will 
be used only one time. The patch also changes the backend classes to 
check if the class tx_rsaauth_keypair was already called. And it adds 
some error handling.

The patch is created against TRUNK revision 10349.

Kind regards,
Marco
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