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# mcrypt_get_key_size

(3.0.8 - 3.0.18 only, PHP 4 >= 4.0.0)

mcrypt_get_key_size -- Get the key size of the specified cipher

## Description

``int mcrypt_get_key_size` (int cipher)`

``int mcrypt_get_key_size` (string cipher, string module)`

The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x.

mcrypt_get_key_size() is used to get the size of a key of the specified `cipher`.

mcrypt_get_key_size() takes one or two arguments, the `cipher` and `module`, and returns the size in bytes.

See also: mcrypt_get_block_size().

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