5285 /**

  5286  * Get the appropriate crypto backend for this server

  5287  * @return string

  5288  */

  5289 

  5290 function install_get_crypto_backend()

  5291 {

  5292   $crypto_backend = 'none';

  5293 

  5294   // Extension test: BCMath

  5295   if ( function_exists('bcadd') )

  5296     $crypto_backend = 'bcmath';

  5297   

  5298   // Extension test: Big_Int

  5299   if ( function_exists('bi_from_str') )

  5300     $crypto_backend = 'bigint';

  5301   

  5302   // Extension test: GMP

  5303   if ( function_exists('gmp_init') )

  5304     $crypto_backend = 'gmp';

  5305   

  5306   return $crypto_backend;

  5307 }

  5308