mcrypt_module_get_algo_block_size(3) php man page | unix.com

MCRYPT_MODULE_GET_ALGO_BLOCK_SIZE(3)					 1				      MCRYPT_MODULE_GET_ALGO_BLOCK_SIZE(3)

mcrypt_module_get_algo_block_size - Returns the blocksize of the specified algorithm

SYNOPSIS
       int mcrypt_module_get_algo_block_size (string  $algorithm, [string  $lib_dir])

DESCRIPTION
	Gets the blocksize of the specified algorithm.

PARAMETERS
	      o $algorithm
		- The algorithm name.

	      o $lib_dir
		- This optional parameter can contain the location where the mode module is on the system.

RETURN VALUES
	Returns the block size of the algorithm specified in bytes.

PHP Documentation Group 										      MCRYPT_MODULE_GET_ALGO_BLOCK_SIZE(3)