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(PHP 4, PHP 5)

mcrypt_get_block_sizeGets the block size of the specified cipher


int mcrypt_get_block_size ( int $cipher )
int mcrypt_get_block_size ( string $cipher , string $mode )

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_block_size() is used to get the size of a block of the specified cipher (in combination with an encryption mode).

It is more useful to use the mcrypt_enc_get_block_size() function as this uses the resource returned by mcrypt_module_open().



Eine der Konstanten von MCRYPT_ciphername oder der Name eines Algorithmus als Zeichenkette.


Eine der Konstanten von MCRYPT_MODE_modename oder eine der folgenden Zeichenketten: "ecb", "cbc", "cfb", "ofb", "nofb" oder "stream".


Gets the block size, as an integer.


Beispiel #1 mcrypt_get_block_size() example

This example shows how to use this function when linked against libmcrypt 2.4.x and 2.5.x.


echo mcrypt_get_block_size('tripledes''ecb'); // 8


Siehe auch

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User Contributed Notes 1 note

mehaase at gmail dot com
10 months ago
You should explain that the block size is return in BYTES, not the more commonly used unit, bits. Many readers are not going to know the DES block size and figure this out on their own.
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