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PHP mcrypt_create_iv

PHP original manual for mcrypt_create_iv [ show | php.net ]


(PHP 4, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_create_ivCreates an initialization vector (IV) from a random source


This function was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0.

Alternatives to this function include:


string mcrypt_create_iv ( int $size [, int $source = MCRYPT_DEV_URANDOM ] )

Creates an initialization vector (IV) from a random source.

The IV is only meant to give an alternative seed to the encryption routines. This IV does not need to be secret at all, though it can be desirable. You even can send it along with your ciphertext without losing security.



The size of the IV.


The source of the IV. The source can be MCRYPT_RAND (system random number generator), MCRYPT_DEV_RANDOM (read data from /dev/random) and MCRYPT_DEV_URANDOM (read data from /dev/urandom). Prior to 5.3.0, MCRYPT_RAND was the only one supported on Windows.

Note that the default value of this parameter was MCRYPT_DEV_RANDOM prior to PHP 5.6.0.

Note: Note that MCRYPT_DEV_RANDOM may block until more entropy is available.

Return Values

Returns the initialization vector, or FALSE on error.


Version Description
5.6.0 MCRYPT_DEV_URANDOM is now the default value of source.
5.3.0 MCRYPT_DEV_RANDOM and MCRYPT_DEV_URANDOM became available on Windows platforms.
5.3.0 It is no longer required to call srand() first. This is now done automatically.


Example #1 mcrypt_create_iv() Example

$iv mcrypt_create_iv($sizeMCRYPT_DEV_RANDOM);

See Also