The first prototype is when linked against libmcrypt
2.2.x, the second when linked against libmcrypt 2.4.x or
2.5.x.
mcrypt_get_key_size() is used to
get the size of a key of the specified
cipher (in combination with an encryption
mode).
This example shows how to use this function when linked
against libmcrypt 2.4.x and 2.5.x.
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See also:
mcrypt_get_block_size() and
mcrypt_encrypt().